三种不同组合电极催化还原高浓度硝酸盐氮研究.pdfVIP

三种不同组合电极催化还原高浓度硝酸盐氮的研究① 周 丽, 邓慧萍, 刘振中, 桑松表 （同济大学环境科学与工程学院,上海 200092 ） 摘要：以重金属Pd 、Cu 或Pd/Cu 为催化剂对阴极进行改性，采用三种不同组合电极 形式（以电镀方式改性的无孔钛板为阴极，阳极为炭板；经吸附负载改性的活性炭纤维绑缚 在钛网上形成阴极，阳极为相同面积的钛网；以负载改性的多孔钛板为阴极，以相同面积的 多孔钛板为阳极），考察了其对硝酸盐氮的去除效果以及反应副产物氨氮的生成情况。试验 结果表明，将催化剂吸附负载于电极上对硝酸盐氮的去除效果比电镀负载方式好；负载催化 剂的ACF 电极系统会有黑色絮体脱落，影响处理水体水质；负载钯/铜的多孔钛板具有较高 的安全性，适于饮用水中硝酸盐氮的处理。 关键词：组合电极；钛板；ACF ；钯/铜；副产物；硝酸盐氮；氨氮 Research on reduction of high-concentration nitrate with three kinds of different combining electrodes Zhou Li, Deng Huiping, Liu Zhenzhong, Sang Songbiao (Tongji University Environmental science and technological institute Shanghai 200092) Abstract: We investigate the nitrate removal effect and the formation of by-product ammonium with three kinds of different combining electrodes which have been modified by Pd, Cu and Pd/Cu. The three combining electrodes is following: imperforate titanium plate electroplated by catalysts is cathode and carbon plate is anode; titanium meshwork attached by active carbon fiber(ACF) which has adsorbed different catalysts is cathode, the titanium meshwork with same area is anode; porous titanium plate adsorbing different catalysts is cathode and the porous titanium with same area is anode. The research results proved that adsorbed catalyst was more effective than electroplating catalysts; the ACF electrode with catalysts has black floccule which has negative effect to the treated water; the porous titanium as electrode with Pd/Cu is safer than other electrode and it is fit for removing nitrate in drinking water. Key words : combining electrodes; titanium plate; ACF; palladium/copper; by-product; nitrate; ammonium 0 ．引言 地下水中的硝酸盐是一种日益增加且分布广泛的污染物质。地下水中的硝酸盐的污染 主要来自以下几个方面：氮素化肥的使用；生活污水和含氮工业废