Abstract
Ethylenediaminetetraacetic acid (EDTA) was used to enhance pre-magnetized Fe0/H2O2 process for sulfamethazine (SMT) removal at neutral pH. Only 19.4% SMT was removed in pre-Fe0/H2O2 within 60 min at neutral pH while 90.6% SMT was removed after addition of 0.1 mM EDTA. Meanwhile, k (103) value for SMT removal in pre-Fe0-EDTA/H2O2 was 1.3 folds larger than in Fe0-EDTA/H2O2. Single-factor experiments and response surface methodology (RSM) were used to optimize the system for SMT removal. Maximum k (103) value was 81.4 min−1 obtainning at conditions of Fe0 0.28 g L−1, EDTA 0.13 mM, and H2O2 36.2 μM. The presence of EDTA and magnetization could inhibit the generation of iron oxides, reduce the contact angle of Fe0, and improve the recovery of surface FeII which induced a faster catalytic decomposition of H2O2. The system could still achieve good performance for removing SMT after six consecutive reaction cycles. These results demonstrated that pre-Fe0-EDTA/H2O2 system has the potential application for wastewater treatment.
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