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An atomic/molecular layer deposition (ALD/MLD) process for the fabrication of cerium-based metal–organic hybrid films is demonstrated for the first time. The highly reactive cerium(III) guanidinate precursor [Ce(dpdmg)3] was employed in combination with organic precursors composed of rigid backbones, terephthalic acid (TPA) and hydroquinone (HQ) for the growth of the respective hybrid films. Growth rates of the films as high as 5.4 Å per cycle for Ce-TPA and 4.8 Å per cycle for Ce-HQ at a deposition temperature of 200 °C were obtained. Density functional theory (DFT) investigations confirm the favorable interaction between the cerium precursor and the organic co-reactants and predict that Ce maintains its +3 oxidation state in the films. This was also confirmed experimentally by X-ray photoelectron spectroscopy (XPS). Additionally, the films are highly UV absorbing. Hence, we envision that these films could find future application as promising redox active materials and/or UV absorbing materials. [ABSTRACT FROM AUTHOR]

In recent years, metal‐organic frameworks composed of polydentate carboxylic acid esters and pyridyl ligands have attracted much attention because these ligands can adopt a variety of coordination modes to form crystalline products exhibiting interesting structures and various properties. A new cadmium(II) metal‐organic framework (MOF), poly[[half[μ5‐2,5‐di(4‐carboxy‐phenylthio) terephthalic acid‐κ5O1#3 : O2#3 : O3#2 : O4 : O4#2]][μ2‐1,2‐di(pyridin‐4‐yl)diazene‐κ2N1 : N4#1]cadmium(II)], namely [Cd(C22H10O8S2)0.5(C10H10N4)]n or [Cd(PSTP)0.5(4‐DiPyDz)]n, is constructed from CdII ions, 2,5‐di(4‐carboxy‐phenylthio) terephthalic acid (H4PSTP) and 1,2‐di(pyridin‐4‐yl)diazene (4‐DiPyDz) ligands under solvothermal conditions. The title compound was structurally characterized by single crystal X‐ray diffraction analysis, elemental analysis, powder X‐ray diffraction and IR spectroscopy. This structure indicates that in situ reduction of 4‐DiPyDz occurs during synthesis, containing a CdII center, a primary ligand H4PSTP and an ancillary ligand 4‐DiPyDz in one asymmetric unit. Thermal stability, solid state photoluminescence, and the ability to detect small organic molecules as fluorescent probes have also been investigated. [ABSTRACT FROM AUTHOR]

Two magnetic metal-organic frameworks were synthesized with a core-shell structure. Maghemite (γ-Fe2O3) as the magnetic core was used to prepare γ-Fe2O3@SiO2, γ-Fe2O3@SiO2-NH2 and γ-Fe2O3@SiO2-NH2-COOH nanoparticles (MNPs) via tetraethyl orthosilicate (TEOS), (3-aminopropyl)trimethoxysilane (APTMS) and glutaric anhydride (GA). γ-Fe2O3@SiO2-NH2-COOH nanoparticles were further modified by Core-Shell package of Tb-BDC-NH2 and Tb-BDC, in which the ligands were 2-aminoterephthalic acid (H2BDC-NH2) and terephthalic acid (H2BDC). IR spectra were used for structure determination of γ-Fe2O3, γ-Fe2O3@SiO2, γ-Fe2O3@SiO2-NH2-COOH and γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC nanoparticles. Magnetic solid-phase extraction (MSPE) of norfloxacin (Nor) experiments exhibited that, for γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC-NH2 nanoparticles, the best adsorption was obtained at pH = 6. For γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC nanoparticles, the best adsorption was obtained at pH = 4. γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC nanoparticles exhibit characteristic TbIII emission spectra at 490 (5D4→7F6), 545 (5D4→7F5), 585 (5D4→7F4) and 621 nm (5D4→7F3) after MSPE of norfloxacin. X-ray photoelectron spectroscopy (XPS) spectra are used for determination of γ-Fe2O3@SiO2-NH2-COOH, γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC and γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC + Nor nanoparticles. XPS results showed that coordination occurs between γ-Fe2O3@SiO2-NH2-COOH/Tb-BDC nanoparticles and Nor. [ABSTRACT FROM AUTHOR]

A new compound, {[Co(TPA)(PYIM)2(H2O)2](MI)4}n(1)(H2TPA = terephthalic acid, PYIM = 2-(3-pyridine) benzimidazole, MI = 2-lmidazolidone) has been urothermal synthesized and structurally characterized by elemental analysis, IR Spectra, the Powder Diffraction and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that the (1 D)+(2D hydrogen bonds) pillar the compound 1 into an open 3 D supramolecular framework with a pore along the b axis (approximate dimensions 4.5 × 15 Å2), which is occupied by free MI molecules. In addition, the catalytic-degradation capacity of compound 1 for methylene blue (MB) was investigated. Supplemental data for this article can be accessed online at 10.1080/24701556.2021.1916760 [ABSTRACT FROM AUTHOR]

Presented is a new heterometallic compound, namely [Cd2Ba2(pdc)4(H2O)4(DMA)2]}n·n(H2O) (1, H2pdc = terephthalic acid, DMA is N, N′‐dimethylacetamide), which was created with the solvothermal reaction. The architectural analysis of X‐ray indicated that the 1 reveals a three‐dimensional skeleton according to one‐dimensional infinite chains. After removal of the free along with coordinated solvent molecules, it contains 49.8% solvent‐accessible volume and unsaturated coordination sites. The solvent‐free form of 1 exhibits excellent catalytic effect for the addition reaction between diethylzinc and benzaldehyde. Its therapeutic effect and mechanism exploration on diabetes was conducted in this present research. Firstly, the abundance of intestinal flora in the gut was detected with real time RT‐PCR assay. Besides, the measurement of the levels of sugar was conducted with blood glucose meter in the T2DM animal after compound treatment. The cytotoxicity of the 1 was evaluated with CCK‐8 assay. [ABSTRACT FROM AUTHOR]

Photo-electrocoagulation with aluminum electrodes is becoming an increasingly attractive process for the degradation of organic pollutants in low concentration levels, such as those found in secondary effluents (biological processes). The technological potential of this approach relies on the synergistic effect of the electrochemical generation of coagulants, active chlorine species, and photochemical reactions promoted by UV irradiation (λ = 254 nm) which results in the formation of highly reactive oxygen species such as the ·OH radical. In this context, the goal of this work was to demonstrate and evaluate the influence of the operating parameters of a laboratory-scale photo-electrocoagulation process on the generation of ·OH radicals. Using fluorescence spectrophotometry, it was possible to detect and quantify ·OH radicals by means of coumarin and terephthalic acid assessment. The production of ·OH radicals was highly influenced by the pH of the solution, observing the highest concentration at pH 3. Chloride concentration also showed a positive effect on the generation of ·OH radicals; however, this influence was only observed up to a chloride ion concentration of 30 mM. In addition, phenol mineralization of 20.1% was achieved by applying a current density of 2.7 mA cm−2 under 2 h of irradiation. To the best of our knowledge, this is the first study that demonstrates the production of ·OH radicals in a photo-electrocoagulation process with aluminum electrodes. [ABSTRACT FROM AUTHOR]

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The search for a straightforward technology for post-consumer poly(ethylene terephthalate) (PC-PET) degradation is essential to develop a circular economy. In this context, PET hydrolases such as cutinases can be used as bioplatforms for this purpose. Humicola insolens cutinase (HiC) is a promising biocatalyst for PC-PET hydrolysis. Therefore, this work evaluated a kinetic model, and it was observed that the HiC seems not to be inhibited by any of the main PET hydrolysis products such as terephthalic acid (TPA), mono-(2-hydroxyethyl) terephthalate (MHET), and bis-(2-hydroxyethyl) terephthalate (BHET). The excellent fitting of the experimental data to a kinetic model based on enzyme-limiting conditions validates its employment for describing the enzymatic PC-PET hydrolysis using two-particle size ranges (0.075–0.250, and 0.250–0.600 mm) and temperatures (40, 50, 55, 60, 70, and 80 °C). The Arrhenius law provided a reliable parameter (activation energy of 98.9 ± 2.6 kJ mol−1) for enzymatic hydrolysis, which compares well with reported values for chemical PET hydrolysis. The thermodynamic parameters of PC-PET hydrolysis corresponded to activation enthalpy of 96.1 ± 3.6 kJ mol−1 and activation entropy of 78.9 ± 9.5 J mol−1 K−1. Thus, the observed rate enhancement with temperature was attributed to the enthalpic contribution, and this understanding is helpful to the comprehension of enzymatic behavior in hydrolysis reaction. [ABSTRACT FROM AUTHOR]

Several bacteria possess components of catabolic pathways for the synthetic polyester poly(ethylene terephthalate) (PET). These proceed by hydrolyzing the ester linkages of the polymer to its monomers, ethylene glycol and terephthalate (TPA), which are further converted into common metabolites. These pathways are crucial for genetically engineering microbes for PET upcycling, prompting interest in their fundamental biochemical and structural elucidation. Terephthalate dioxygenase (TPADO) and its cognate reductase make up a complex multimetalloenzyme system that dihydroxylates TPA, activating it for enzymatic decarboxylation to yield protocatechuic acid (PCA). Here, we report structural, biochemical, and bioinformatic analyses of TPADO. Together, these data illustrate the remarkable adaptation of TPADO to the TPA dianion as its preferred substrate, with small, protonatable ring 2-carbon substituents being among the few permitted substrate modifications. TPADO is a Rieske [2Fe2S] and mononuclear nonheme iron-dependent oxygenase (Rieske oxygenase) that shares low sequence similarity with most structurally characterized members of its family. Structural data show an α-helix-associated histidine side chain that rotates into an Fe (II)-coordinating position following binding of the substrate into an adjacent pocket. TPA interactions with side chains in this pocket were not conserved in homologs with different substrate preferences. The binding mode of the less symmetric 2-hydroxy-TPA substrate, the observation that PCA is its oxygenation product, and the close relationship of the TPADO α-subunit to that of anthranilate dioxygenase allowed us to propose a structure-based model for product formation. Future efforts to identify, evolve, or engineer TPADO variants with desirable properties will be enabled by the results described here. [ABSTRACT FROM AUTHOR]

Color‐tunable smart afterglow materials in response to excitation wavelength and time simultaneously is highly important for anticounterfeiting and data encryption application, which remains a great challenge to date. Here, we provide a simple and efficient approach to develop color‐tunable afterglow supramolecular assembly AxBy@Lap in response to excitation wavelength and time simultaneously through the co‐assembly of non‐emissive nanoclay (Lap) and two different kinds of guests (A: Terephthalic acid (TPA), B: Terpyridine‐derivatives) using a simple solventless grinding method. Experimental and theoretical researches clear that the different decay lifetimes and origin for multiple afterglow emission centers bring about the aforementioned distinctive excitation wavelength‐ and time‐dependent feature. Furthermore, AxBy@Lap reveal excellent color‐tunable afterglow behavior with excitation wavelength‐ and time‐dependent feature in aqueous solution with water content of 99 wt %. Benefiting from this excellent characteristics, multi‐modal anti‐counterfeiting and encryption application were exhibited. [ABSTRACT FROM AUTHOR]

A mild and efficient photocatalytic C–H bond activation strategy has been developed based on organic small molecules. A combination of the excellent redox-active activity of the pyridinium unit and Brønsted basic site of the N-heterocyclic unit offers a concerted pathway for H abstraction through concomitant proton and electron transfer, thus solving the key dehydrogenation process of C–H bond activation. The photocatalytic system shows high performance in selective oxidation of ethylbenzene, toluene and its homologue, and a gram-level conversion of p-xylene into terephthalic acid has been achieved at room temperature under an air atmosphere without any co-catalysts and additives. [ABSTRACT FROM AUTHOR]

In this work, an electrochemical filter using an electrospun carbon nanofiber membrane (ECNFM) anode fabricated by electrospinning, stabilization and carbonization was developed for the removal of antibiotic tetracycline (TC). ECNFM with 2.5 wt% terephthalic acid (PTA) carbonized at 1000 °C (ECNFM-2.5%-1000) exhibited higher tensile stress (0.75 MPa) and porosity (92.8%), more graphitic structures and lower electron transfer resistance (23.52 Ω). Under the optimal condition of applied voltage 2.0 V, pH 6.1, 0.1 mol L−1 Na2SO4, initial TC concentration 10 ppm and membrane flux 425 LMH, the TC removal efficiency of the electrochemical filter of ECNFM-2.5%-1000 reached 99.8%, and no obvious performance loss was observed after 8 h of continuous operation. The pseudo-first-order reaction rate constant in flow-through mode was 2.28 min−1, which was 10.53 times higher than that in batch mode. Meanwhile, the energy demand for 90% TC removal was only 0.017 kWh m−3. TC could be converted to intermediates with lower developmental toxicity and mutagenicity via the loss of functional groups (-CONH2, -CH3, -OH, -N(CH3)2) and ring opening reaction, which was mainly achieved by direct anodic oxidation. This study highlights the potential of ECNFM-based electrochemical filtration for efficient and economical drinking water purification. [ABSTRACT FROM AUTHOR]

We'll report on two series all‐aromatic main‐chain reactive oligomers that can be crosslinked in either the nematic phase or in the isotropic phase. This series is unique in that both model systems have an identical backbone geometry, comprised of hydroquinone with or without a phenyl substituent and phenyl substituted terephthalic acid. Crosslinking the oligomers (Mn of 1–9 kg/mol) via maleimide end‐groups in the nematic or isotropic phase yields networks with similar crosslink densities (Mc) and similar thermal properties. Crosslinked films exhibit high decomposition temperatures (>395°C) and amorphous thermoset films exhibit Tg's in the 141–190°C range whereas nematic thermoset films give Tg's that range from 143 to 176°C, as measured by DMTA. However, the phase type appears to have a major effect on the stress–strain behavior of the films. All films prepared by crosslinking un‐aligned nematic oligomers show poor stress–strain behavior (σ = 20–63 MPa, ε = 0.5%–5.4%), whereas crosslinking the amorphous oligomers results in films with excellent stress–strain properties (σ = 94–97 MPa, ε = 7.1%–13.3%). The superior toughness of the cured amorphous films can be attributed to the larger free volume induced by steric crowding of the phenyl substituents in the polymer repeat unit. [ABSTRACT FROM AUTHOR]

The development of a new type of oxygen evolution reaction (OER) catalyst to reduce the energy loss in the process of water electrolysis is of great significance to the realization of the industrialization of hydrogen energy storage. Herein, we report the catalysts of NiFe double-layer hydroxide (NiFe-LDH) mixed with different equivalent terephthalic acid (TPA), synthesized by the hydrothermal method. The catalyst synthesized with the use of the precursor solution containing one equivalent of TPA shows the best performance with the current density of 2 mA cm−2 at an overpotential of 270 mV, the Tafel slope of 40 mV dec−1, and excellent stable electrocatalytic performance for OER. These catalysts were characterized in a variety of methods. X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FTIR), and Raman spectrum proved the presence of TPA in the catalysts. The lamellar structure and the uniform distribution of Ni and Fe in the catalysts were observed by a scanning electron microscope (SEM) and a transmission electron microscope (TEM). In X-ray photoelectron spectroscopy (XPS) of NiFe-LDH with and without TPA, the changes in the peak positions of Ni and Fe spectra indicate strong electronic interactions between TPA and Ni and Fe atoms. These results suggest that a certain amount of TPA can boost catalytic activity. [ABSTRACT FROM AUTHOR]

A novel nanocomposite of CuO nanoparticle-modified Zr-MOF (CuO/UiO-66) was synthesized and developed as a fluorescence nanoplatform for H2O2 and adenosine triphosphate (ATP) via the "turn-on–off" mode in the presence of terephthalic acid (TA). The structure of CuO/UiO-66 was thoroughly characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and other techniques. The CuO/UiO-66 with enhanced peroxidase-like (POD) activity obtained due to the Zr4+ in UiO-66 is beneficial to the aggregation of CuO NPs on its surface. As a result, the strengthened fluorescence at 425 nm with the excitation of 300 nm was found due to the highly fluorescent species of TAOH. This is produced by the oxidation of TA by ·OH that came from the catalysis of H2O2 via the peroxidase mimic of CuO/UiO-66. Hence the modification of CuO NPs on porous UiO-66 can provide a friendly and sensitive physiological condition for H2O2 detection. However, upon addition of ATP, the fluorescence intensity of TAOH at 425 nm effectively declined owing to the formation of complexation of Zr4+-ATP and the interaction of CuO to ATP which hampers the catalytic reaction of CuO/UiO-66 to H2O2. The specific interaction induced "inhibition of the peroxide-like activity" endows the sensitive and selective recognition of ATP. The detection limits were 16.87 ± 0.2 nM and 0.82 ± 0.1 nM, and linear analytical ranges were 0.02–100 μM and 0.002–30 μM for H2O2 and ATP, respectively. The novel strategy was successfully applied to H2O2 and ATP determination in serum samples with recoveries of 97.2–103.8% for H2O2 and 97.6–101.7% for ATP, enriching the avenue to design functional MOFs and providing new avenue of multicomponent bioanalysis. [ABSTRACT FROM AUTHOR]

Komagataeibacter xylinus strains DSM 2004 and DSM 46604 were evaluated for their ability to grow and produce bacterial cellulose (BC) upon cultivation on terephthalic acid (TA) and ethylene glycol (EG), which are monomers of the petrochemical-derived plastic polyethylene terephthalate (PET). Both strains were able to utilize TA, EG, and their mixtures for BC synthesis, with different performances. K. xylinus DSM 2004 achieved higher BC production from TA (0.81 ± 0.01 g/L), EG (0.64 ± 0.02 g/L), and TA + EG mixtures (0.6 ± 0.1 g/L) than strain DSM 46604. The latter was unable to utilize EG as the sole carbon source and reached a BC production of 0.16 ± 0.01 g/L and 0.23 ± 0.1 g/L from TA alone or TA + EG mixtures, respectively. Further supplementing the media with glucose enhanced BC production by both strains. During cultivation on media containing TA and EG, rapid pH drop due to metabolization of EG into acidic compounds led to some precipitation of TA that was impregnated into the BC pellicles. An adaptation of the downstream procedure involving BC dissolution in NaOH was used for the recovery of pure BC. The different medium composition tested, as well as the downstream procedure, impacted the BC pellicles’ physical properties. Although no variation in terms of the chemical structure were observed, differences in crystallinity degree and microstructure of the produced BC were observed. The BC produced by K. xylinus DSM 2004 had a higher crystallinity (19–64%) than that of the strain DSM 46604 (17–53%). Moreover, the scanning electron microscopy analysis showed a higher fiber diameter for K. xylinus DSM 2004 BC (46–56 nm) than for K. xylinus DSM 46604 (37–49 nm). Dissolution of BC in NaOH did not influence the chemical structure; however, it led to BC conversion from type I to type II, as well as a decrease in crystallinity. These results demonstrate that PET monomers, TA and EG, can be upcycled into a value-added product, BC, presenting an approach that will contribute to lessening the environmental burden caused by plastic disposal in the environment.

8-(dimethylamino)-N,N-dimethylnaphthalen-1-aminium hydrogenterephthalate (PSH+TPAH-) and 8-(dimethylamino)-N,N-dimethylnaphthalen-1-aminium hydrogen-terephthalate hydrate (PSH+TPAH-·H2O) were prepared by the direct reaction of N1,N1,N8,N8-tetramethylnaphthalene-1,8-diamine, Proton Sponge (PS) © and terephthalic acid (TPAH2) in a 1:1 stoichiometric relation. The structure of both salts is constructed on the base of 1D chains defined by hydrogen bonding of the anionic carboxylate end and the carboxylic acid of TPAH-anion. Additionally for the structure of PSH+TPAH-·H2O the water molecules connect this 1D chains through hydrogen bonds, then defining a 1D-belt. In both cases the PSH+ provides balance of charge among the chains. [ABSTRACT FROM AUTHOR]

The ability of amino acid-based hydrazide ligands to produce polar crystalline materials that could possess technologically important physical properties, such as ferroelectricity, is tested. Two new coordination polymers {Cu3(L1/L2)2(TPA)}n×solvent were prepared in solvothermal reaction of copper(II) ions, terephthalic acid (TPA) and amino acid-based hydrazide ligands (H2L1 = N,N′-di- L -leucine hydrazide; H2L2 = N,N′-di- L -phenylalanine hydrazide). Structural analysis showed that both coordination polymers crystallize in an enantiomorphic polar point group 1 (C1) at room temperature. The assembled coordination polymers are neutral and consist of three copper(II) ions bridged with two amino acid-based hydrazide molecules, which in turn are linked with TPA molecules to form an overall one-dimensional structure. The magnetic order in these compounds is an antiferromagnetic interaction between copper(II) ions bridged by a hydrazide (–N–N–) bridge. Thermal decomposition of the two coordination polymers begins above 480 K, confirming the high thermal stability of the amino acid hydrazide ligands. The DSC shows that both compounds undergo a reversible phase transition around 388 K. The two coordination polymers show electrical conductivities of less than 10−10 S cm−1, with no change in the real part of the dielectric constant throughout the studied temperature range. Since both compounds crystallize in the ferroelectric space group, the occurrence of spontaneous polarization was tested by polarization–voltage hysteresis experiments. [ABSTRACT FROM AUTHOR]

A novel sulfurized carbon decorated by terephthalic acid (TPA) and polyacrylonitrile (PAN), with unprecedently high tap density (≈1.02 g cm−3), is investigated. Room‐temperature sodium–sulfur batteries offer high energy density; however, the dissolution of the polysulfide is a major factor hindering their commercialization. This dissolution problem can be tolerated by inhibiting the formation of polysulfide through binding sulfur to the carbon structure of PAN. Low sulfur content and low volumetric energy density in the composite are other drawbacks to be resolved. Heat‐treated TPA induces a high‐density carbonaceous material with high conductivity. This TPA is partly replaced by PAN, and the produced carbon and sulfur are composited with dehydrated polyacrylonitrile (CS–DPAN), which exhibits higher conductivity and surface area than the sulfurized dehydrated polyacrylonitrile (S–DPAN). The CS–DPAN composite electrode exhibits excellent electrochemical performance, and the resulting volumetric capacity is also superior to that of the S–DPAN material electrode. Operando Raman and operando X‐ray diffraction analyses confirm that the increased capacity is realized via the avoidance of parasitic C60Na3 formation formed below 1 V, by adjusting the operation voltage range. This finding demonstrates the feasibility of carbon–sulfur composites as a high‐energy electrode material for rechargeable sodium batteries. [ABSTRACT FROM AUTHOR]

Common technologies for waste polyethylene terephthalate (PET) hydrolysis generally use strong acids or alkalis as catalysts; however, these processes are costly and generate a large amount of acid, alkali, and salt wastewater. In addition, these catalysts are difficult to recycle and reuse, which is not in line with the concept of sustainable development. This study describes the use of concentrated p-toluenesulfonic acid (PTSA) as an acid catalyst for PET hydrolysis under relatively mild conditions, enabling the degradation of approximately 100% of PET into 96.2% of terephthalic acid (TPA) within 90 minutes at 150 °C. A similar degradation efficiency can only be achieved at 150 °C using concentrated sulfuric acid for over 5 h. The generated TPA was easily separated from the hydrolysis system via filtration. The used PTSA was easily recovered from the filtrate after TPA collection using simple concentration and crystallization technologies. The recovered PTSA still maintained excellent catalytic efficiency for PET hydrolysis after five consecutive cycles. Furthermore, the kinetics of the reaction confirmed that the PET hydrolysis catalyzed by concentrated PTSA conforms to a first-order reaction with a relatively low apparent activation energy of 76.4–125.4 kJ mol−1. Finally, the technical feasibility and environmental impact of a scale-up were evaluated using Aspen Plus simulations. Overall, this work proposes a feasible and green strategy for the low-cost and environmentally friendly hydrolysis of waste PET. [ABSTRACT FROM AUTHOR]

A new copolyesters of poly(2-[4-(2-hydroxyethoxy)phenoxy]ethyl-co-1,4-cyclohexylenedimethylene terephthalate) (PHCT) with different compositions were synthesized from terephthalic acid, 1,4-cyclohexanedimethanol and hydroquinone bis(2-hydroxyethyl) ether (HQEE) via esterification-polycondensation reaction. The synthesized copolyesters were analyzed by 1H-NMR, FT-IR, GPC, intrinsic viscosity, DSC, TGA and tensile testing, respectively. The 1H-NMR and FT-IR analysis confirm the successful introduction of HQEE into poly(1,4-cyclohexylenedimethylene terephthalate (PCT) chains. The introduction of HQEE into PCT chains can effectively lower the melting point of PCT, making it easier to process. The glass transition temperature of PHCT is higher than 70 ℃ and it has the comparable thermal stabilities to PCT. In addition, introducing HQEE into PCT chains can effectively improve the molecular weights of PCT, thus imparting PHCT with better mechanical performance relative to PCT. The PHCT is a tough polymer, which owns the higher Young's modulus (above 300 MPa), the higher tensile strength (above 39 MPa) and the higher elongation at break (above 226%). [ABSTRACT FROM AUTHOR]

A new copolyesters of poly(1,4-cyclohexylenedimethylene terephthalate-co-4,4'-biphenydicarboxylate) (PCTB) with different compositions were synthesized from terephthalic acid, 1,4-cyclohexanedimethanol and 4,4'-biphenyldicarboxylic acid (BDA) via esterification-polycondensation reaction. The synthesized copolyesters were analyzed by 1H-NMR, 13C-NMR, FT-IR, GPC, intrinsic viscosity, DSC, TGA and tensile testing, respectively. The 1H-NMR, 13C-NMR and FT-IR results verify the successful introduction of BDA into poly(1,4-cyclohexylenedimethylene terephthalate (PCT) chains. The introduction of BDA into PCT chains can effectively lower the melting point of PCT, making it easier to process. The glass transition temperature of PCTB is higher than 103 °C and its thermal stability is better than that of PCT. The rheological tests confirm the enhanced melting stability of PCT after introducing BDA into PCT chains. Furthermore, the PCTB, which owns the comparable mechanical properties to PCT, is a tough polymer with the higher Young's modulus (above 230 MPa), the higher tensile strength (above 41 MPa) and the higher elongation at break (above 159%). [ABSTRACT FROM AUTHOR]

The supported bimetallic AuPd nanoparticles hold great promise for the selective oxidation of 5‐hydroxymethylfurfural (HMF) to 2, 5‐furan dicarboxylic acid (FDCA), a substitute for petroleum derivative terephthalic acid (TPA). Herein, by combining a versatile Pickering high internal phase emulsions (HIPEs) template with subsequent carbonization process, cobalt‐based hierarchical porous carbon (CoOx−HPC) support was obtained. After loading bimetallic AuPd nanoparticles through the sol‐gel method, AuPd/CoOx−HPC catalyst was successfully synthesized. By changing the Pickering HIPEs parameters, carbonization temperature, the porous structure and cobalt valence of as‐synthesized catalyst can be adjusted. The obtained catalysts were systematically characterized by SEM, TEM, N2 adsorption‐desorption, XRD, XPS, and TGA. Benefiting from the synergistic effects of the high porosity of CoOx−HPC support and efficient AuPd nanoparticles, tandem oxidation of HMF to FDCA can be carried out in the water. We have clarified that the catalysts with various cobalt valence states showed superior performance, and the highest FDCA yield of 97.2 % will be obtained under the optimal reaction conditions. Meanwhile, the kinetics study indicated that the oxidation of FFCA to FDCA was the rate‐determining step. Moreover, the AuPd/CoOx−HPC catalyst revealed excellent stability in HMF oxidation during four cycles. The experimental results demonstrated that as‐prepared AuPd/CoOx−HPC catalysts are efficient towards FDCA production from the selective oxidation of HMF. [ABSTRACT FROM AUTHOR]

Spiro[3.3]heptane-2,6-dicarboxylic acid (Fecht's acid, H2SHDC) is examined as a non-aromatic terephthalic acid isostere for the first time. The rigid spirocyclic backbone provides greater steric bulk than conventional aromatic dicarboxylates with consequences for pore chemistry and control of interpenetration, presented here in the structures of two new MOFs. Complex 1 is a three-dimensional rod packed structure consisting of Yb-carboxylate chains bridged by SHDC linkers which, although non-porous, exhibits a surprisingly high thermal stability for a spirocyclic cyclobutane derivative. Complex 2 is a co-ligand complex of SHDC with trans-1,2-bis(4-pyridyl)ethene (bpe) which contains linear solvent channels despite fourfold interpenetration. Although the framework does not retain its structure following evacuation, a clear difference is observed in the extended structure compared to the structurally related terephthalate species. This observation suggests the non-aromatic backbone of Fecht's acid and other rigid aliphatic linkers may prove an effective means to disfavour deleterious close inter-framework contacts which prevail in interpenetrated aromatic MOFs. [ABSTRACT FROM AUTHOR]

Background: Biochar ozonization was previously shown to dramatically increase its cation exchange capacity, thus improving its nutrient retention capacity. The potential soil application of ozonized biochar warrants the need for a toxicity study that investigates its effects on microorganisms. Results: In the study presented here, we found that the filtrates collected from ozonized pine 400 biochar and ozonized rogue biochar did not have any inhibitory effects on the soil environmental bacteria Pseudomonas putida, even at high dissolved organic carbon (DOC) concentrations of 300 ppm. However, the growth of Synechococcus elongatus PCC 7942 was inhibited by the ozonized biochar filtrates at DOC concentrations greater than 75 ppm. Further tests showed the presence of some potential inhibitory compounds (terephthalic acid and p-toluic acid) in the filtrate of non-ozonized pine 400 biochar; these compounds were greatly reduced upon wet-ozonization of the biochar material. Nutrient detection tests also showed that dry-ozonization of rogue biochar enhanced the availability of nitrate and phosphate in its filtrate, a property that may be desirable for soil application. Conclusion: Ozonized biochar substances can support soil environmental bacterium Pseudomonas putida growth, since ozonization detoxifies the potential inhibitory aromatic molecules. [ABSTRACT FROM AUTHOR]

Certain members of the Actinobacteria and Proteobacteria are known to degrade polyethylene terephthalate (PET). Here, we describe the first functional PET-active enzymes from the Bacteroidetes phylum. Using a PETase-specific Hidden-Markov-Model- (HMM-) based search algorithm, we identified several PETase candidates from Flavobacteriaceae and Porphyromonadaceae. Among them, two promiscuous and cold-active esterases derived from Aequorivita sp. (PET27) and Kaistella jeonii (PET30) showed depolymerizing activity on polycaprolactone (PCL), amorphous PET foil and on the polyester polyurethane Impranil® DLN. PET27 is a 37.8 kDa enzyme that released an average of 174.4 nmol terephthalic acid (TPA) after 120 h at 30°C from a 7 mg PET foil platelet in a 200 μl reaction volume, 38-times more than PET30 (37.4 kDa) released under the same conditions. The crystal structure of PET30 without its C-terminal Por-domain (PET30ΔPorC) was solved at 2.1 Å and displays high structural similarity to the Is PETase. PET30 shows a Phe-Met-Tyr substrate binding motif, which seems to be a unique feature, as Is PETase, LCC and PET2 all contain Tyr-Met-Trp binding residues, while PET27 possesses a Phe-Met-Trp motif that is identical to Cut190. Microscopic analyses showed that K. jeonii cells are indeed able to bind on and colonize PET surfaces after a few days of incubation. Homologs of PET27 and PET30 were detected in metagenomes, predominantly aquatic habitats, encompassing a wide range of different global climate zones and suggesting a hitherto unknown influence of this bacterial phylum on man-made polymer degradation. [ABSTRACT FROM AUTHOR]

[Display omitted] • PPTA was completely degraded in 5 wt% NaOH/ n -butanol system at 180 °C for 6 h. • The yields of TPA and PPD were up to 92.0% and 91.5%, respectively. • The wettability of n -alcohols on PPTA had obvious effect on PPTA degradation. • The addition of a small amount of water can accelerate the degradation of PPTA. Poly-p-phenylene terephthamide (PPTA) is widely applied in bulletproof products and composite materials because of its high strength, high modulus, high temperature resistance and creep resistance. The PPTA molecule with highly symmetrical and regular structure is linear structure formed by the alternating connection of benzene ring and amide bond, and the amide bonds between the molecular chains form strong hydrogen bonds. Therefore, the dissolution and depolymerization of PPTA is very challenging. In this work, an efficient catalytic system was developed for the controllable degradation of waste PPTA, and the high-value added monomers terephthalic acid (TPA) and p-phenylenediamine (PPD) were recovered. The results show that the amide bonds of PPTA can be selectively cleaved by the strong Brönsted base catalysts in alcohols, especially in the NaOH/ n -butanol system. Under the optimal degradation conditions (5 wt% NaOH in n -butanol, 180 °C, 6 h), the percentage degradation of PPTA is 100%, and the yields of TPA and PPD are 92.0% and 91.5%, respectively. In addition, it is found that the wettability of n -alcohols on PPTA monofilament and the addition of a small amount of water have important influences on the degradation of PPTA. The work elucidates the degradation mechanism of PPTA, and reveals the important factors affecting the depolymerization of PPTA. [ABSTRACT FROM AUTHOR]

• Optimization of thermal and electrical efficiencies of a PV module using combined PCMs. • The new PCM composites are synthesized to cool down a PV module. • The composite of three PCMs including beeswax, coconut oil and paraffin is proposed as an efficient PCM (namely PBWCO). • Terephthalic acid (TPA) as a thermal-conductive filler is added PBWCO with different weight fractions. • The maximum thermal and electrical efficiency of the TPA-PBWCO/PV system at the optimum point are 90.76% and 14.88%, respectively. The purpose of this study is an optimization of thermal and electrical efficiencies of a photovoltaic module using combined phase change materials (PCMs) with a thermo-conductive filler. Composites of beeswax and coconut oil (BWCO) and its mixture with paraffin (PBWCO) are introduced as novel PCMs and used to thermal regulation in a photovoltaic (PV) module. Terephthalic acid powder (TPA) is added to PBWCO to upgrade its thermal conductivity. The electrical and thermal efficiencies (η e and η th), as dependent variables, are investigated by the response surface methodology (RSM) to obtain the optimal condition of the PV/TPA-PBWCO system. The selected independent factors of the cooling system are beeswax weight fraction in BWCO (X 1 = 0–100%wt), BWCO weight fraction in PBWCO (X 2 = 0–50%wt), TPA weight fraction in PBWCO (X 3 = 0–12%wt) and weight of PCM (X 4 = 2.1–4.1 kg). Results show that for uncooled mode, η e and η th are 8.16% and 58.61%, respectively. The results illustrate the usage of BWCO put out higher electrical and thermal efficiencies than their pure ones. BWCOs with X 1 > 45%wt and X 1 < 45%wt suffer from high and low melting points, respectively. The results prove that PBWCO with X 2 > 37.5%wt reduces the effect of the PCM, which is due to the increase of the melting point, although it has slightly increased the latent heat and thermal conductivity, the effect of melting point is more dominant. The addition of TPA to PBWCO remarkably enhances the cooling system performance. The predicted electrical and thermal efficiencies at the optimal point are 14.88% and 90.76%, respectively, at X 3 = 8.48%wt and X 4 = 3.253 kg. [ABSTRACT FROM AUTHOR]

In this paper, MIL-53/Analcime (MIL-53/ANA) composite were synthesized by hydrothermal method using Al3+ as metal site and carboxyl group of the ligand (terephthalic acid). The structural composition of the composite was analyzed by SEM, XRD, FTIR, EDS, TG and other characterization methods. The adsorption mechanism of MIL-53/ANA to cesium was discussed. The results showed The composite has good thermal stability, with a specific surface area of 198.13 m2/g and a pore volume of 0.216 cm3/g. The maximum adsorption capacity of Cs (I) was 173.52 mg/g. It conforms to the pseudo-second-order kinetic model and Freundlich isothermal adsorption model, and the chemical adsorption plays a dominant role in the overall Cs + adsorption process. [ABSTRACT FROM AUTHOR]

Polyethylene terephthalate (PET) biodegradation is regarded as an environmentally friendly degradation method. In this study, an artificial microbial consortium composed of Rhodococcus jostii , Pseudomonas putida and two metabolically engineered Bacillus subtilis was constructed to degrade PET. First, a two-species microbial consortium was constructed with two engineered B. subtilis that could secrete PET hydrolase (PETase) and monohydroxyethyl terephthalate hydrolase (MHETase), respectively; it could degrade 13.6% (weight loss) of the PET film within 7 days. A three-species microbial consortium was further obtained by adding R. jostii to reduce the inhibition caused by terephthalic acid (TPA), a breakdown product of PET. The weight of PET film was reduced by 31.2% within 3 days, achieving about 17.6% improvement compared with the two-species microbial consortium. Finally, P. putida was introduced to reduce the inhibition caused by ethylene glycol (EG), another breakdown product of PET, obtaining a four-species microbial consortium. With the four-species consortium, the weight loss of PET film reached 23.2% under ambient temperature. This study constructed and evaluated the artificial microbial consortia in PET degradation, which demonstrated the great potential of artificial microbial consortia in the utilization of complex substrates, providing new insights for biodegradation of complex polymers. [ABSTRACT FROM AUTHOR]

Metal–organic frameworks (MOFs) are materials with a large surface area and antimicrobial properties are advantageous properties for the controlled release of molecules for biomedical applications. However, their synthesis is expensive and harmful to the environment due to the use of organic ligands and solvents. Thus, this work proposes the synthesis of a new MOF by hydrothermal method using water as the solvent, aluminium nitrate as a metallic source, and bis(2-hydroxyethyl) terephthalate (BHET) as organic ligand, obtained via glycolysis of polyethylene terephthalate (PET); and its comparison with MIL53-Al MOF, synthesized from terephthalic acid (BDC) as organic ligand. Both MOFs were characterized by XRD, ATR-FTIR, N2 physisorption, TGA, SEM and XPS; besides their in vitro biocompatibility was tested by porcine fibroblasts viability. The results indicate that aluminium ions are coordinated to both carbonyl and hydroxyl functional groups of the BDC and BHET organic ligands. The new BHET-Al MOF shows higher thermal stability than MIL53-Al, it also exhibits a macroporous structure in comparison with the microporosity of the MIL53-Al. BHET-Al MOF is not cytotoxic for porcine dermal fibroblasts growing on its surface for up to 48 h of culture, thus, this innovative MOF is a promising material for the controlled release of drugs. [ABSTRACT FROM AUTHOR]

Two cobalt metal–organic frameworks (Co-MOFs), [Ch]2[Co3(BDC)3Cl2] (1) and [Ch]2[Co3(BDC)4]·2DMU (2) (Ch+ = choline cation; H2BDC = terephthalic acid; DMU = 1,3-dimethylurea), were prepared through ionothermal reactions with deep eutectic solvents (DESs) of ChCl and DMU as the reaction media. The 1/GCE electrode with better current response was selected as the electrocatalyst. The detection performance of the 1/GCE electrode towards glucose is excellent with a wide linear range of 10–1200 μmol L−1, a detection limit of 3.2 μmol L−1 (S/N = 3), and a rapid response less than 3 s in 0.01 mol L−1 NaOH. 1 also exhibits high anti-interference with the existence of D -Man, D -Fru, DL -AA, and BA, long-term stability of 15 days and reproducibility for glucose detection. 1 was utilized to detect glucose in human serum and orange juice. The found glucose concentrations are very close to the added glucose concentrations in the selected situations with low RSD and high recoveries. This demonstrates that as a non-enzymatic glucose sensor, 1/GCE can detect glucose with high accuracy and reliability in different environments. [ABSTRACT FROM AUTHOR]

The alkaline depolymerization reaction of poly(ethylene terephthalate) (PET) under quasi‐solvent‐free conditions was investigated. This is a new approach for recycling PET waste to its monomer building blocks: terephthalic acid and ethylene glycol. The influence of base particle size, reaction temperature, and rotational speed of the employed laboratory kneader on terephthalic acid yield in the quasi‐solid‐solid reaction was investigated. PET is depolymerized almost quantitatively in a reaction time of 5 min at moderate reaction temperatures, with intense mixing affecting the yield of terephthalic acid. The quality of the terephthalic acid monomer, assessed by color index measurements, indicated that the reaction temperature primarily influences the color index of the monomer. By balancing terephthalic acid yield versus color index, optimum reaction conditions were proposed. [ABSTRACT FROM AUTHOR]

By a bifunctional organic ligand 2-(benzimidazol-1-yl)terephthalic acid (H2bitp) featuring both imidazol-carboxylate groups, two new Cu(II)-containing coordination polymers (CPs) with the chemical formulae of {[Cu(bitp)(bpa) 0.5(H2O)2]·0.5bpa}n (1, bpa = 1,2-bis(4-pyridyl)ethylane) and {[Cu1.5(bitp)(Hbitp)(2,2′-bpy)(H2O)]·3H2O}n (2, 2,2′-bpy = 2,2′-bipyridine) have been successfully prepared by reaction of Cu(NO3)2·3H2O with the H2bitp ligand in the presence of different N-donor co-ligands. Then, the protective activity of compounds against periodontitis was assessed and the related mechanism was discussed at the same time. First, after the reverse transcription-polymerase chain reaction was conducted and the relative expression levels of the nf-κb and p53 genes related with inflammatory response in the periodontal mucosal cells was measured. In addition to this, the releasing levels of the inflammatory cytokines in to the gingival crevicular fluid was determined with compound 1 or 2 with enzyme-linked immunosorbent assay detection assay. [ABSTRACT FROM AUTHOR]

Occupational hypersensitivity pneumonitis (OHP) is an interstitial lung disease caused by sensitization to an inhaled antigen. Polyethylene terephthalate (PET) is mainly used for disposable beverage bottles. A clinical case of hypersensitivity pneumonitis (HP) in a 66-year-old patient in the follow-up as a worker formerly exposed to asbestos is presented. At the first visit in 2012 a diagnosis of asbestosis and pleural plaques was formulated. In 2017 the high resolution computed tomography was performed demonstrating a slight progression of the pulmonary fibrosis, while physical examinations revealed inspiratory crackles on auscultation, and lung function tests showed a decreased diffusing capacity for carbon monoxide. The radiological and histological pictures were compatible with HP. From 1992 to 2013 the patient worked in a chemical company that produced PET for disposable beverage bottles. A diagnosis of OHP was made, and the most likely causative agents were terephthalic acid and dimethyl terephthalate. To the best of the authors’ knowledge, this is the first report of an OHP case in PET production. Int J Occup Med Environ Health. 2020;33(1):119–23

Large-scale terephthalic acid production from the oxidation of p-xylene is an especially important process in the polyester industry, as it is mainly used in polyethylene terephthalate (PET) manufacturing, a polymer that is widely used in fibers, films, and plastic products. This review presents and discusses catalytic advances and new trends in terephthalic acid production (since 2014), innovations in terephthalic acid purification processes, and simulations of reactors and reaction mechanisms.

Polyethylene terephthalate (PET) biodegradation is regarded as an environmentally friendly degradation method. In this study, an artificial microbial consortium composed of Rhodococcus jostii, Pseudomonas putida and two metabolically engineered Bacillus subtilis was constructed to degrade PET. First, a two-species microbial consortium was constructed with two engineered B. subtilis that could secrete PET hydrolase (PETase) and monohydroxyethyl terephthalate hydrolase (MHETase), respectively; it could degrade 13.6% (weight loss) of the PET film within 7 days. A three-species microbial consortium was further obtained by adding R. jostii to reduce the inhibition caused by terephthalic acid (TPA), a breakdown product of PET. The weight of PET film was reduced by 31.2% within 3 days, achieving about 17.6% improvement compared with the two-species microbial consortium. Finally, P. putida was introduced to reduce the inhibition caused by ethylene glycol (EG), another breakdown product of PET, obtaining a four-species microbial consortium. With the four-species consortium, the weight loss of PET film reached 23.2% under ambient temperature. This study constructed and evaluated the artificial microbial consortia in PET degradation, which demonstrated the great potential of artificial microbial consortia in the utilization of complex substrates, providing new insights for biodegradation of complex polymers.

Context: Poly(butylene adipate-co-terephthalate) (PBAT) is a biodegradable plastic. It was introduced to the plastics market in 1998 and since then has been widely used around the world. The main idea of this research is to perform quantum chemical calculations to study the potential toxicity of PBAT and its degradation products. We analyzed the electron transfer capacity to determine its potential toxicity. We found that biodegradable products formed with benzene rings are as good electron acceptors as PBAT and OOH • . Our results indicate that the biodegradation products are potentially as toxic as PBAT. This might explain why biodegradation products alter the photosynthetic system of plants and inhibit their growth. From this and other previous investigations, we can think that biodegradable plastics could represent a potential environmental risk., Methods: All DFT computations were performed using the Gaussian16 at M062x/6-311 + g(2d,p) level of theory without symmetry constraints. Electro-donating (ω-) and electro-accepting (ω +) powers were used as response functions., (© 2024. The Author(s).)

[Display omitted] ZrIV metal–organic framework based on terephthalic acid and 1,10-phenanthroline has been prepared by solvothermal method. The product represents an effective adsorbent for solid phase extraction of tetracycline antibiotics from aqueous media. [ABSTRACT FROM AUTHOR]

Atomic/molecular layer deposition (ALD/MLD) is currently strongly emerging as an intriguing route for novel metal–organic thin-film materials. This approach already covers a variety of metal and organic components, and potential applications related to e.g. sustainable energy technologies. Among the 3d metal components, nickel has remained unexplored so far. Here we report a robust and efficient ALD/MLD process for the growth of high-quality nickel terephthalate thin films. The films are deposited from Ni(thd)2 (thd: 2,2,6,6-tetramethyl-3,5-heptanedionate) and terephthalic acid (1,4-benzenedicarboxylic acid) precursors in the temperature range of 180–280 °C, with appreciably high growth rates up to 2.3 Å per cycle at 200 °C. The films are amorphous but the local structure and chemical state of the films are addressed based on XRR, FTIR and RIXS techniques. [ABSTRACT FROM AUTHOR]

An investigation of the crystal growth of metal organic framework MIL-68(In) under solvothermal conditions revealed a non-classical reversed crystal growth mechanism via a route of nanorods – orientated aggregation into polycrystalline microrods – surface recrystallisation into a hexagonal shell – extension of recrystallisation from the surface to the core of the microrods. Terephthalic acid molecules which are adsorbed onto the surface of nanorods are believed to strengthen the inter-particle interaction, leading to an early stage aggregation of the monocrystalline nanorods. [ABSTRACT FROM AUTHOR]

A new metal–organic-framework (MOF) called UiO-66-NH-COCF3 was prepared using a trifluoroacetamido-functionalized terephthalic acid ligand. Powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, thermogravimetric analysis (TGA) and a Brunauer Emmett–Teller (BET) experiment were carried out to investigate the phase purity, functionality, thermal stability and surface area, respectively, of the newly synthesized MOF material. The solvent-free MOF material (1′) was obtained by stirring the as-synthesized material in methanol for 24 h and then heated at 100 °C in vacuum. A systematic fluorescence study of 1′ showed an ultrafast, highly selective turn-on response towards the lethal cyanide (CN−) ion. A 300-fold increment in fluorescence intensity was observed, which has not previously been reported for any probe for cyanide sensing. To check the selectivity of 1′ towards CN− over other interfering anions, fluorescence sensing experiments were performed with 1′ in the presence of a wide range of anions, none of which caused significant interference. The detection time for the probe 1′ towards CN− was only 1 min, with a very low limit of detection (LOD) (0.28 μM). A fluorescence study was carried out in different pH media to check its usefulness towards the sensing of CN− in a wide pH range. Naked-eye detection of CN− was achieved by a paper strip coated with MOF material, which showed promise for more realistic applications. The reversibility of the CN− sensor was demonstrated using trifluoroacetic acid as the proton source. Furthermore, we could utilize the probe to detect CN− in food and real water samples. [ABSTRACT FROM AUTHOR]

This paper describes the synthesis and characterization of Zn2+ decorated (adipic and terephthalic acid as linkers) piperazine-based metal-organic framework (P-MOFs) and their extraction behavior toward the Chicago sky blue (CSB) dye. The formation of Zn2+-decorated P-MOFs was confirmed by FT-IR spectroscopy, energy-dispersive spectroscopy, X-ray diffraction, BET surface area analysis and TGA. Adsorption behavior of the synthesized P-MOFs was explored through solid-phase adsorption (batch method) prior to UV-Vis spectrophotometric determination. Adsorption parameters, including adsorbent dosage, pH of solution, dye concentration, and time, were optimized. Excellent percentage removal of 94% and 95% for AP-Zn-MOF and TP-Zn-MOF, respectively, was achieved at pH 7.5. Kinetics studies indicated that the synthesized adsorbents AP-Zn-MOF and TP-Zn-MOF followed the pseudo-second-order rate model with R2 value 0.9989. The Freundlich isotherm with high R2 value as compared to Langmuir isotherm indicated that CSB adsorption for the synthesized MOFs follows multilayer adsorption. [ABSTRACT FROM AUTHOR]

• TPA was reported as acid catalyst for PET hydrolysis. • TPA was easily recovered and reused. • Waste PET was converted to value-added platform chemicals. • This work provides a green, easy, and low-cost technology for PET hydrolysis. Hydrolysis of polyethylene terephthalate (PET) is an efficient strategy for the depolymerization of waste PET to terephthalic acid (TPA), which can be used as a fundamental building block for the repolymerization of PET or for the synthesis of biodegradable plastics and metal–organic frameworks. However, most of the reported hydrolysis catalysts are strong acids or bases, which are soluble in reaction media and difficult to separate after the reaction, leading to high production costs and a profound influence on the environment. Herein, we propose the use of TPA, the basic unit of PET, as an acid catalyst to promote the hydrolysis of PET. Under optimized conditions, i.e., 2.5 g of PET, a TPA concentration of 0.1 g/mL, mass ratio PET:H 2 O of 1:8, 220 °C of temperature, and 180 min of reaction time, a PET conversion of up to 100.0% and a TPA yield of 95.5% were achieved. Furthermore, the produced TPA exhibited a high purity of 99%, similar to that of fresh TPA, and was easily recoverable for PET hydrolysis without tedious workup and purification processes. More importantly, the hydrolysis efficiency was maintained over eight consecutive reaction cycles. Overall, this study provides a green, easy, and low-cost technology to recover and reuse TPA for waste PET hydrolysis. [ABSTRACT FROM AUTHOR]