首页|Microwave synthesis of metal-organic frameworks absorbents (DUT-5-2) for the removal of PFOS and PFOA from aqueous solutions
Microwave synthesis of metal-organic frameworks absorbents (DUT-5-2) for the removal of PFOS and PFOA from aqueous solutions
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NSTL
Elsevier
Perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) are new persistent pollutants that are difficult to degrade. In this work, DUT-5-2 and other six metal-organic frameworks were prepared to remove PFOS and PFOA; their adsorption amount, micropore and adsorption performances (kinetics, isotherms, pH, ions and renewability) were determined. DUT-5-2 had the highest adsorption amount (PFOS: 145.4 mg/g; PFOA: 98.2 mg/g), its microporous characteristic (specific surface area: 1840 m(2)/g, pore volume: 0.93 cm(3)/g, pore size: 0.85 nm) and single tooth coordination mode were verified by N-2 isotherms and Fourier-transform infrared (FTIR) spectroscopy. The results of adsorption kinetics and adsorption isotherms revealed that adsorption process of DUT-5-2 involves with a physical monolayer adsorption and the maximum adsorption capacities of PFOS and PFOA were 1015 mg/g and 473.7 mg/g, respectively. The removal rate for PFOS and PFOA would be somewhat affected by the pH and anions; when pH = 3, DUT-5-2 had the highest removal rate for PFOS (96.6%) and PFOA (60.9%). A slight negative effect on the removal rate was found at Cl (PFOS: 95.6-93.6%, PFOA: 60.6-58.9%) and SO42- (PFOS: 90.9-88.9%, PFOA: 58.0-56.9%) with the concentration of 25-100 mg/L. After four cycles, the regeneration efficiency of DUT-5-2 for PFOS and PFOA was 92.5% and 93.0%, respectively. This study provides a new method for the microwave synthesis of DUT-5-2 to remove PFOS and PFOA from an aqueous environment.
NSTL
Elsevier
