Search

[Display omitted] Rational synthesis of metal–organic frameworks (MOFs) via structural and morphology engineering are fundamental for enhanced heavy metal removal. Beyond tuning intrinsic characteristics, it is essential to address inseparability and instability issues of MOFs to fulfill the practical applications. Herein, we successfully constructed macroscopic zeolitic imidazole frameworks-functionalized melamine sponge (MS@ZIF x , x represents the ultrasonication duration) using a facile dip-coating method. By varying ultrasonication duration, the morphology and structure of the loaded ZIF were modulated from leaf-shaped phase to hollow mixed phase to achieve the excellent adsorption performance. The optimized MS-ZIF 10 exhibited significantly enhanced performance for Pb(II) and Cu(II) adsorption. Specifically, the MS-ZIF 10 combined high adsorption capacities (624.8 and 588.6 mg g−1 for Pb(II) and Cu(II), respectively), rapid kinetics, excellent anti-interfering capability (e.g. , cations, dissolved organic matters) with outstanding reusability (removal efficiency > 91.8 % after 10 cycles). The MS-ZIF 10 presented satisfactory performance on Pb(II) and Cu(II) removal in various real water matrices. Fixed-bed experiments were performed to assess the practicality of MS-ZIF 10 , and 1821 bed volumes (BVs) and 1630 BVs of feeding streams containing Pb(II) and Cu(II) were effectively treated. This work proposed a novel paradigm for promoting the MOF's performance and simultaneously boosting MOF's application in actual heavy metal removal. [ABSTRACT FROM AUTHOR]

[Display omitted] Rational synthesis of metal–organic frameworks (MOFs) via structural and morphology engineering are fundamental for enhanced heavy metal removal. Beyond tuning intrinsic characteristics, it is essential to address inseparability and instability issues of MOFs to fulfill the practical applications. Herein, we successfully constructed macroscopic zeolitic imidazole frameworks-functionalized melamine sponge (MS@ZIF x , x represents the ultrasonication duration) using a facile dip-coating method. By varying ultrasonication duration, the morphology and structure of the loaded ZIF were modulated from leaf-shaped phase to hollow mixed phase to achieve the excellent adsorption performance. The optimized MS-ZIF 10 exhibited significantly enhanced performance for Pb(II) and Cu(II) adsorption. Specifically, the MS-ZIF 10 combined high adsorption capacities (624.8 and 588.6 mg g−1 for Pb(II) and Cu(II), respectively), rapid kinetics, excellent anti-interfering capability (e.g. , cations, dissolved organic matters) with outstanding reusability (removal efficiency > 91.8 % after 10 cycles). The MS-ZIF 10 presented satisfactory performance on Pb(II) and Cu(II) removal in various real water matrices. Fixed-bed experiments were performed to assess the practicality of MS-ZIF 10 , and 1821 bed volumes (BVs) and 1630 BVs of feeding streams containing Pb(II) and Cu(II) were effectively treated. This work proposed a novel paradigm for promoting the MOF's performance and simultaneously boosting MOF's application in actual heavy metal removal. [ABSTRACT FROM AUTHOR]

Ion imprinted polymer (IIP) technology is traditionally used to selectively recover heavy metal ions from wastewater, but the low adsorption capacity and high cost has restricted its large-scale practical application. Exploring a novel method with high selectivity and low cost to capture heavy metals is necessary but very challenging. Herein, we first report a highly selective and high-performance absorbent via free radical polymerization of thiolactone functionalized acrylamide (named as PAM-TL). The PAM-TL demonstrated much higher capacity (145.2 mg/g) for Ag(I), which is 5.8 times that of corresponding IIP (25.07 mg/g). Moreover, the distribution coefficient of PAM-TL (576.1) was 5.1 times that of the IIP material (113.8). Furthermore, PAM-TL absorbent was also equipped with superior stability and recyclability (outstanding adsorption performance after six cycles). The excellent performance was attributed to the abundant binding site density and the strong interaction between absorbent and Ag(I), which was determined by X-ray photoelectron spectroscopy and elemental analysis. This work provides a novel approach for highly effective and selective capturing heavy metal ions, which is of great significance to actual applications in wastewater treatment. [ABSTRACT FROM AUTHOR]