【摘要】 为深入了解接触辉光放电等离子体降解水中有机污染物的机理,用高效液相色谱法检测了4-氯苯酚的降解中间产物,用光度法检测了溶液中生成的过氧化氢.结果表明:在4-氯苯酚降解的同时溶液中有大量过氧化氢产生,4-氯苯酚的降解速率和过氧化氢的生成速率随着电流的升高而加快;4-氯苯酚的去除率和过氧化氢的生成速率随着4-氯苯酚初始质量浓度的升高而降低,但4-氯苯酚的绝对去除量随着4-氯苯酚初始质量浓度的升高而增加.铁盐对4-氯苯酚的去除有明显的催化作用,铁离子的催化效果优于亚铁离子.无催化剂时4-氯苯酚的降解中间产物主要为羟基化苯酚;在铁盐存在下主要的中间产物为对4-氯儿茶酚、对苯醌和对苯二酚.更多还原

【Abstract】 In order to probe the degradation mechanism of 4-chlorophenol by contact glow discharge electrolysis(CGDE),the intermediate products and hydrogen peroxide formed during 4-chlorophenol degradation were determined by high performance liquid chromatography and colorimetric method,respectively.Experimental results show that a lot of hydrogen peroxide is formed during 4-chlorophenol degradation.Both the rates of 4-chlorophenol degradation and hydrogen peroxide formation speed up with the increase of electric current,which the increase of 4-chlorophenol initial concentration can decrease its removal rate and the formation rate of hydrogen peroxide.However,the absolute amount of 4-CP removed increases with the increase of 4-chlorophenol initial concentration.Iron salts have apparent catalytic effect on 4-chlorophenol removal,where the catalytic action of ferric ions is better than that of ferrous ions.Without iron salts,the primary intermediate products are hydroxylated phenols,while 4-chlorocatechol,benzoquinone and hydroquinone are major intermediate products with iron salts.更多还原