HANZi-heng,BAIRen-bi,JIAXiang-ling,et al.Fenton Process for Removal of Sb(Ⅲ) and Sb(Ⅴ) from Wastewater[J].China Water & Wastewater,2022,38(23):109-115.
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Fenton Process for Removal of Sb(Ⅲ) and Sb(Ⅴ) from Wastewater

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第23期 Page: 109-115 Column: Date of publication: 2022-12-01
Author(s):
HAN　Zi-heng1; 2;  BAI　Ren-bi1; 2;  JIA　Xiang-ling1; 2;  ZHU　Tian1;  YANG　Jing-jing1; 2
（1. School of Environmental Science and Engineering， Suzhou University of Science and Technology， Suzhou 215009， China； 2. Center for Separation and Purification Materials ＆ Technology， Suzhou University of Science and Technology， Suzhou 215009， China）
Keywords:
Fenton reagent;  Sb(Ⅲ);  Sb(Ⅴ);  ferric coagulation
Abstract:
The effects of Fe2+/H2O2 system under different reaction time, pH and concentrations of H2O2 and Fe2+ on Sb(Ⅲ) and Sb(Ⅴ) removal (concentration of 5 mg/L for both) from simulated wastewater were investigated, the antimony removal efficiency of Fenton and ferric coagulation was compared, and the mechanism of antimony removal from wastewater by Fenton process was explored by XPS. The optimal parameters for Sb(Ⅲ) and Sb(Ⅴ) removal were identical: pH of 4.0, Fe2+ concentration of 5.6 mg/L, H2O2 to Fe2+ ratio of 2∶1 and reaction time of 40 min. Under these conditions, the removal rates of Sb(Ⅲ) and Sb(Ⅴ) by Fe2+/H2O2 system were 75.8% and 68.9%, respectively. When the ratio of H2O2 to Fe2+ was in the range from 2∶1 to 8∶1, the removal rates of Sb(Ⅲ) and Sb(Ⅴ) were basically unchanged. When the concentration of Fe2+ exceeded 5.6 mg/L, the removal rates of Sb(Ⅲ) and Sb(Ⅴ) increased little, but the residual iron concentration increased sharply. When the pH was in the range from 3.0 to 5.0, Fe2+/H2O2 had high removal rates for Sb(Ⅲ) and Sb(Ⅴ). However, with the increase of pH, the removal rates of both Sb(Ⅲ) and Sb(Ⅴ) decreased significantly, and the removal rate of Sb(Ⅲ) was more significantly affected by pH. Fenton process showed better removal performance on both Sb(Ⅲ) and Sb(Ⅴ) compared with ferric coagulation when pH was in the range of 3.0-5.0. The XPS results indicated that the combination between Sb(Ⅲ) and flocs was stronger than Sb(Ⅴ) and flocs, which was related to the removal of the two forms of antimony by Fenton system. The removal of Sb(Ⅲ) by Fenton process was the comprehensive effect consisting of co-precipitation between Sb(Ⅲ) and Fe3+ generated by oxidation, adsorption of Sb(Ⅲ) and Sb（Ⅴ） as its oxidation product by newly formed iron oxide. The removal of Sb(Ⅴ) was mainly due to the adsorption by newly formed iron oxide.
Last Update: 2022-12-01