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27. Preparation of SiO2/Attapulgite Composite Materials and Investigation of Its Adsorption Performance on Toluene in Humid Environment.

Author

Wenjie Liu, Ding, Xiang, Liu, Jingwei, Meng, Jie, Li, Xiazhang, Gao, Bingying, Zuo, ShiXiang, Yao, Chao, and Xue, Bing

Abstract

The composites (SiO2/HATP) were prepared by condensation reflux and high-temperature calcination using natural attapulgite and silica particles, and it was utilized for the adsorption of toluene. The physicochemical properties of the composite adsorbents were characterized using XRD, FT-IR, SEM, and BET techniques. The SiO2/HATP composite material was successfully prepared, with silica particles uniformly loaded onto the surface of ATP. The adsorption performance of the composite materials for toluene was investigated using different feed ratios. The results showed that the composite materials with the mass ratio SiO2/ATP equal to 4 exhibited the highest static adsorption capacity for toluene, reaching 236 mg/g. Additionally, dynamic adsorption performance of toluene was evaluated under conditions of 0 and 80% relative humidity, with corresponding breakthrough times of 90 and 36 min, respectively. The adsorption capacity of the composite materials for toluene was 6–8 times higher than that of pure attapulgite clay. Furthermore, the adsorption mechanisms of the composite materials were investigated through adsorption kinetics, adsorption isotherms, and adsorption thermodynamics. The results indicated that the adsorption of toluene by the composite materials followed a pseudo-first-order kinetic model and Langmuir adsorption isotherm, suggesting a spontaneous exothermic physical adsorption process at a monolayer level. Moreover, regeneration experiments were conducted, and after 5 cycles of adsorption-desorption tests, the composite materials maintained a penetration time of 85 and 30 min for toluene under conditions of 0 and 80% relative humidity, respectively, demonstrating good recyclability. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Development of Plasmonic Attapulgite/Co(Ti)O x Nanocomposite Using Spent Batteries toward Photothermal Reduction of CO 2.

Author

Zuo, Shixiang, Qin, Shan, Xue, Bing, Xu, Rong, Shi, Huiting, Lu, Xiaowang, Yao, Chao, Gui, Haoguan, and Li, Xiazhang

Subjects
SURFACE plasmon resonance, CARBON dioxide, FULLER'S earth, PLASMONICS, METAL wastes, INFRARED absorption
Abstract

The rapid development of the battery industry has brought about a large amount of waste battery pollution. How to realize the high-value utilization of waste batteries is an urgent problem to be solved. Herein, cobalt and titanium compounds (LTCO) were firstly recovered from spent lithium-ion batteries (LIBs) using the carbon thermal reduction approach, and plasmonic attapulgite/Co(Ti)Ox (H-ATP/Co(Ti)Ox) nanocomposites were prepared by the microwave hydrothermal technique. H-ATP had a large specific surface area and enough active sites to capture CO2 molecules. The biochar not only reduced the spinel phase of waste LIBs into metal oxides including Co3O4 and TiO2 but also increased the separation and transmission of the carriers, thereby accelerating the adsorption and reduction of CO2. In addition, H-ATP/Co(Ti)Ox exhibited a localized surface plasmon resonance effect (LSPR) in the visible to near-infrared region and released high-energy hot electrons, enhancing the surface temperature of the catalyst and further improving the catalytic reduction of CO2 with a high CO yield of 14.7 μmol·g−1·h−1. The current work demonstrates the potential for CO2 reduction by taking advantage of natural mineral and spent batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Plasmonic quantum dots modulated nano-mineral toward photothermal reduction of CO2 coupled with biomass conversion.

Author

Cao, Guangbiao, Xing, Haoran, Gui, Haoguan, Yao, Chao, Chen, Yinjuan, Chen, Yongsheng, and Li, Xiazhang

Subjects
BIOMASS conversion, IRRADIATION, QUANTUM dots, SURFACE plasmon resonance, PLASMONICS, BENZYL alcohol, BIOMASS chemicals, ALCOHOL oxidation
Abstract

Simultaneous conversion of CO2 and biomass into value-added chemicals through solar-driven catalysis holds tremendous importance for fostering a sustainable circular economy. Herein, plasmonic Bi quantum dots were immobilized on phosphoric acid modified attapulgite (P-ATP) nanorod using an in-situ reduction–deposition method, and were employed for photocatalytic reduction of CO2 coupled with oxidation of biomass-derived benzyl alcohol. Results revealed that Bi atoms successfully integrated into the basal structure of P-ATP, forming chemically coordinated Bi–O–Si bonds that served as efficient transportation channels for electrons. The incorporation of high-density monodispersed Bi quantum dots induced a surface plasmon resonance (SPR) effect, expanding the light absorption range into the near-infrared region. As a consequence, the photo-thermal transformation was significantly accelerated, leading to enhanced reaction kinetics. Notably, 50% Bi/P-ATP nanocomposite exhibited the highest plasmon-mediated photocatalytic CH4 generation (115.7 µmol·g−1·h−1) and CO generation (44.9 µmol·g−1·h−1), along with remarkable benzaldehyde generation rate of 79.5 µmol·g−1·h−1 in the photo-redox coupling system under solar light irradiation. The hydrogen protons released from the oxidation of benzyl alcohol facilitated the incorporation of more hydrogen protons into CO2 to form key CH3O− intermediates. This work demonstrates the synergistic solar-driven valorization of CO2 and biomass using natural mineral based catalyst. [ABSTRACT FROM AUTHOR]

Published
2024
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