多孔钛板负载Pd-Cu催化还原水中硝酸盐氮的研究  

ELECTROCATALYTIC REDUCTION OF NITRATE FROM WATER BY POROUS TITANIUM LOADED Pd-Cu CATALYSTS

作　　者：周丽[1] 邓慧萍[2] 桑松表[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]同济大学长江水环境教育部重点实验室,上海200092

出　　处：《环境化学》2008年第2期172-176,共5页Environmental Chemistry

基　　金：国家科技攻关计划课题编号:2003BA808A17

摘　　要：研究了多孔钛板负载Pd-Cu(1∶1)催化剂作为阴极,利用电化学反应器脱除水中的硝酸盐氮,在pH值为6.4,电极板的电流密度为2.3mA·cm-2的条件下,以0.1g·l-1无水硫酸钠作为支持电解质,反应4h后,硝酸盐氮的去除率可以达到36%,出水浓度已接近饮用水标准,然而在此催化剂负载比例下对副产物氨氮的选择率非常高.反应在300mA,pH值为6.4时脱硝效果最高.在合适的浓度下,NO3-占优势地位,受竞争吸附影响小,同时电极板吸附位未达到饱和时,电催化反硝化反应符合表观一级反应动力学.另外,溶液的传质对反硝化没有显著影响;进水口的外露形成的水流跌落有利于NH3的逸出,反应溶液中的NH4+-N副产物减少,但是硝酸盐氮的去除效果受到影响.Investigated performance as well as influencing factors of elctrocatalytic denitrification with a porous titanium electrode loaded Pd-Cu （ 1 ： 1 ） catalysts in water. Under the situation of pH 6. 4, current density 2. 3 mA·cm^-2, 0.1g·l^-1 Na2SO4 support electrolyte, after reacting for 4h, up to 36% of NO3^- was removed, however, with high selectivity of by-products. With current intensity 300mA, pH 6. 4, it could reach the high denitrafication effect. With the appropriate initial concentration of NO3^- , when it was predominant and could not take all the adsorbing dot in the cathode, the nitrate reduction presented an apparent first order reaction. Mass transfer in solution was found little effect on the reaction in the tests. The outside inlet with drifting down flow was benefit for the venting of NH3 and formed less by-product, however, had some bad effect with removing nitrate.

关 键 词：多孔钛板 Pd-cu催化剂 硝酸盐 

分 类 号：TU991.2[建筑科学—市政工程]