活化分子氧降解水中有机污染物的COD_(Cr)值测定  

Measurement of the COD_(Cr) Values of Degraded Organic Pollutants in Water

作　　者：杨有清[1] 蓝伟侦[1] 邓克俭[1] 王夺元[1] 

机构地区：[1]中南民族大学化学与生命科学学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2004年第2期1-4,共4页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目 (2 0 3770 5 3) ;湖北省自然科学基金资助项目 (2 0 0 3ABA0 71 )

摘　　要：用新型仿生催化剂四氮杂卟啉铁 [Fe Pz(dtn) 4]活化分子氧降解了水中难降解有机污染物 :对 -硝基苯甲酸 (NBA)和罗丹明 B(Rh B) .将该催化剂固载到离子交换树脂上 ,在含有高浓度生物难降解有机物的水溶液中鼓入氧气 ,在非均相水溶液中分子氧经催化活化有效氧化降解了有机物分子 .用重铬酸钾法 (CODcr)测定了水溶液中的降解产物的百分含量 ,并用相对 COD值表示催化剂活化分子氧降解有机污染物的矿化率 .实验表明催化氧化降解效率与鼓氧时间成正比 .在没有光照情况下鼓氧 2 4 h后对 -硝基苯甲酸的矿化率为 1 2 % ,罗丹明 B为 1 1 % .Iron (Ⅱ) Tetra (1,4 dithin) tetraazaporphyrin [FePz(dtn) 4] as a new type biomimic catalyst was used to activate molecular oxygen for degrading bio undegradable organic pollutants in water. The degraded reactions of p nitrobenzoic acid ( NBA) and Rhodamine B( RhB) in highly concentrated aqueous solution were carried out by bubbling oxygen and with FePz(dtn) 4supported on the ion exchanged resin catalyst. The chemical oxygen demand (COD) measured by the potassium dichromate titration was used for evaluating the efficiency of catalyzed degradation of the organic pollutants. It′s shown that the efficiency of catalyzed degradation is directly proportional to the time of bubbling oxygen. The relative COD values calculated by comparing the raw solution with the degraded reactant are 11.1% for NBA and 12.1% for Rhodamin B after 24 h for bubbling oxygen.

关 键 词：四氮杂铁卟啉 活化分子氧 降解 有机污染物 化学耗氧量 矿化率 CODCR值 污水处理 

分 类 号：X703.1[环境科学与工程—环境工程] X13