过硫酸钾氧化去除Cu(CN)_3^(2-)中的氰污染物  

Oxidation Destruction of Cu(CN)_3^(2-) by Persulfate

作　　者：王云飞[1,2] 李一兵[1] 王彦斌[2] 齐璠静 赵凯[1] 田世超[1] 郭涛[2] 关伟[2] 赵旭[2] WANG Yun-fei LI Yi-bing WANG Yan-bin QI Fan-jing ZHAO Kai TIAN Shi-chao GUO Tao GUAN Wei ZHAO Xu(School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085

出　　处：《环境科学》2017年第3期1061-1066,共6页Environmental Science

基　　金：国家自然科学基金优秀青年基金项目(51222802)

摘　　要：近年来,氰化物污染问题日益严重,冶金工业、电镀工业中含有大量氰化物.采用常规的物化法难以对Cu(CN)_3^(2-)中的CN^-达到很好的去除效果,因此探索高效、环保的氰化物处理方法迫在眉睫.过硫酸钾作为一种绿色清洁氧化剂,目前被广泛应用于有机污染物废水的处理.采用均相过硫酸钾对Cu(CN)_3^(2-)中CN^-进行降解,并分析其降解机制,详细研究过硫酸钾投加量、铜氰络合比对CN^-去除率的影响.CN^-的去除率随着过硫酸钾量的增加而升高,当过硫酸钾量为2 mmol·L^(-1),反应时间为60 min时,CN^-的去除率可达89.6%;铜氰络合比的增加促进CN^-的降解.Cu^+被氧化为Cu^(2+)并且以氧化铜的形式存在于沉淀中.采用电子自旋共振波谱仪和自由基猝灭实验对反应过程中可能的自由基进行研究,结果表明在过硫酸钾氧化去除CN^-的过程中,既存在硫酸根自由基氧化途径,又存在非自由基氧化途径.In recent years,cyanide contamination problem is becoming more and more serious. Cyanides widely occur in the wastewater from metallurgical industry and electroplating industry. The efficiency for cyanides removal of conventional physical and chemical methods is not very satisfactory. Therefore,it is urgent to develop highly efficient and environmental friendly methods for the removal of cyanides. As an environmental-friendly oxidant,potassium persulfate is widely used in the treatment of organic pollutants.The destruction of Cu（CN）3（2-）was investigated by homogeneous K2S2O8 under alkaline conditions,and the reaction mechanism was analyzed. The effects of the amount of K2S2O8 and the ratio of Cu＋/ CN-on the degradation of CN-were studied. With the increase of K2S2O8 dose,the rate of CN-oxidation was accelerated. The removal efficiency of CN-reached 89. 6% after 60 min of reaction in the presence of 2 mmol·L（-1）K2S2O8. Oxidation of CN-was accelerated with Cu＋/ CN-increasing from 2. 0 to 5. 0. Cu＋was oxidized to Cu（2＋）and copper oxide was formed during the reaction. The reactive radicals were analyzed using electron spin resonance and radical quenching experiments, and the results indicated that both radicals oxidation pathway and non-radical oxidation pathway were responsible for the removal of Cu（CN）3（2-）by K2S2O8.

关 键 词：铜氰络合物 氰化物 过硫酸钾 硫酸根自由基氧化 非自由基氧化 

分 类 号：X703.1[环境科学与工程—环境工程]