Synthesis optimization and X-ray absorption spectroscopy investigation of polymeric anion exchanger supported binary Fe/Mn oxides nanoparticles for enhanced As(III) removal
作者： Antika Pranudta , Wantana Klysubun , Medhat Mohamed El-Moselhy , Surapol Padungthon
DOI: 10.1016/J.REACTFUNCTPOLYM.2019.104441
关键词:
摘要: Abstract A macroporous anion exchange resin containing high density of positively-charged quaternary ammonium functional groups and supporting binary Fe/Mn oxides nanoparticles (HA502P-Fe/Mn) was synthesized for simultaneous As(III)oxidation As(V) adsorption within a single bead. Various preparation parameters were investigated optimized to achieve the highest As(III) removal efficiency, including metal type, materials, solvents, number loading cycles. The results from five imaging techniques (SEM-EDX, TEM, XRD, XANES, EXAFS) confirmed that amorphous ferric manganese successfully dispersed throughout matrix parent exchanger. changes in oxidation state Mn +4 +2 and + 2 observed by XANES during regeneration runs, respectively. EXAFS used investigate neighborhood atoms surrounding arsenic HA502P-Fe/Mn. bond distance between As Fe HA502P-Fe/Mn are 3.35 2.94 A, respectively, suggesting oxidized adsorbed on surface Fe(III) Mn(IV) oxide formation inner-sphere complex. MnO2 under absence oxygen environment only after adsorption. equilibrium sorption isotherms, effect pH, competing ions, NOM also evaluated. Fixed-bed column experiments using NSF challenge water standard 53 (300 μg As(III)/L, pH 6.5) carried out found material can remove equivalent 4300 bed volumes (BVs) compared with 2000 BVs commercial selective (Layne-RT). exhausted be regenerated 10 solution 98% recovered.
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