科研之友
微信
新浪微博
Facebook
分享链接
摘要
Structural Fe(II) Hydroxide (SFH) was used to remove As(III) and As(V) from aerated synthetic wastewater with initially 30 mg/L As at neutral pH values. Batch experiments were performed to investigate the influence of O-2, pH and coexisting HPO42- on As removal by 0.5 g (Fe)/L SFH. The results suggested that removal efficiency for As(III) and As(V) were 60% and similar to 50% under anoxic conditions at initial pH 7.0 and 9.0, respectively. However, the efficiency increased to over 90% for both As(III) and As(V) under oxic conditions. The in situ mineral transformation of SFH to newly formed Fe(II/III) and FeOOH was responsible for the robust removal. As(III) removal was nearly unaffected by HPO42- (1.0 mM), while obviously inhibition was observed in the case of As(V). The microstructure of fresh and reacted SFH was characterized by FTIR and XPS and these results indicate that As was removed via inner-sphere complexation and precipitation. XPS studies showed that As(III) was converted to As(V) after 2 h of reaction in the pH range of 7.0-9.0, which is attributable to enhanced formation of Fe(IV) by the Fenton reaction during mineral transformation. In practice, results of this study suggest that aeration is advantageous to significantly enhancement of As(III) oxidation and removal with highly reactive SFH.
- 出版日期2016-10-5
- 单位同济大学
