孙杰,曾沛,张晗.Fe(Ⅲ)-(S,S)-乙二胺-N,N'-二琥珀酸体系中Cr(Ⅵ)的紫外光还原[J].环境科学学报,2014,34(12):3017-3021
Fe(Ⅲ)-(S,S)-乙二胺-N,N'-二琥珀酸体系中Cr(Ⅵ)的紫外光还原
- Photoreduction of Cr(Ⅵ) with Fe(Ⅲ) -ethylenediamine-N,N'-disuccinic acid system
- 基金项目：湖北省自然科学基金(No.2008CDB400)
- 孙杰
- 中南民族大学环境工程研究所, 武汉 430074
- 曾沛
- 中南民族大学环境工程研究所, 武汉 430074
- 张晗
- 中南民族大学环境工程研究所, 武汉 430074
- 摘要：将易生物降解的天然螯合剂乙二胺-N,N'-二琥珀酸(EDDS)与Fe(Ⅲ)结合形成Fe(Ⅲ)-EDDS体系并用于处理水中Cr(Ⅵ).在紫外光照射下利用该体系对Cr(Ⅵ)进行光还原,考察了溶液pH值、Fe(Ⅲ)-EDDS和Cr(Ⅵ)的初始浓度对Cr(Ⅵ)去除率的影响.结果表明,UV/Fe(Ⅲ)-EDDS体系对Cr(Ⅵ)有光还原作用,且紫外光是反应进行的必要条件.在pH为3.0~8.0的范围内,反应顺利进行,且溶液的pH值越小,Cr(Ⅵ)的还原效果越好,去除率越高. Fe(Ⅲ)-EDDS浓度的增加对Cr(Ⅵ)还原有促进作用,Fe(Ⅲ)-EDDS浓度在0.10~0.30 mmol · L-1之间时,随着Fe(Ⅲ)-EDDS浓度的增大,Cr(Ⅵ)的还原率增大;当溶液中Fe(Ⅲ)-EDDS浓度不变,Cr(Ⅵ)浓度在5~20 mg · L-1之间时,Cr(Ⅵ)的去除率随其浓度的增加而降低.
- Abstract：In this paper, photoreduction of Cr(Ⅵ) using the complex between Fe(Ⅲ) and a readily biodegradable and strong complexing reagent ethylenediamine-N,N'-disuccinic acid (EDDS) was investigated. The experimental parameters such as solution pH, initial concentration of Fe(Ⅲ)-EDDS complex and Cr(Ⅵ) were systematically studied. The experimental results showed that UV irradiation is indispensable for the efficient removal of Cr(Ⅵ). Lower solution pH in the range of 2.0~8.0 favors the photoreduction of Cr(Ⅵ) in Fe(Ⅲ)-EDDS-UV system, and the removal rate of Cr(Ⅵ) was found to increase with increase in the concentration (0.10~0.30 mmol · L-1) of Fe(Ⅲ)-EDDS complex photocatalyst. However, the photoreduction rate of Cr(Ⅵ) decreases with increasing initial concentration of Cr(Ⅵ) (5~20 mg · L-1).
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