负载型催化剂催化臭氧化降解水杨酸

发布时间：2017-12-30 20:21

本文关键词：负载型催化剂催化臭氧化降解水杨酸　出处：《高校化学工程学报》2016年02期 　论文类型：期刊论文

【摘要】：采用浸渍法,分别制备了以γ-Al_2O_3为载体负载镍、铜、钴、锰氧化物的4种催化剂,并对其相组成、比表面积、电荷零点等进行了表征。考察了催化剂种类、投加量及溶液pH对催化臭氧化降解水杨酸效果的影响,并与单独臭氧化进行了比较。结果表明,4种催化剂均具有一定的催化性能,且负载MnO_2的催化剂催化效果最好;催化臭氧化降解效果主要受催化剂种类及溶液pH的影响。当水杨酸初始浓度为3 mmol·L~(-1),MnO_2催化剂投加量为2.5 g·L~(-1),溶液pH为4~8,O_3投加量为12.56 mg·min~(-1)时,反应60 min,溶液UV296和COD去除率分别在98.0%和88.0%以上。机理分析表明,催化剂的吸附作用和催化O_3产生·OH的量共同影响臭氧化降解效果。
[Abstract]:By impregnation method, were prepared by gamma -Al_2O_3 as carriers of nickel, copper, cobalt, manganese oxide 4 kinds of catalysts, and the phase composition, specific surface area, the point of zero charge were characterized. The effects of catalyst type, dosage and solution pH effect on catalytic ozonation degradation of salicylic acid, and compared with the single ozonation. Results showed that 4 kinds of catalyst has some catalytic properties and catalyst, the catalytic effect of MnO_2 had better degradation effect; catalytic ozonation is mainly affected by the type of catalyst and pH solution. When the initial concentration of salicylic acid was 3 mmol - L~ (-1), MnO_2 catalyst the dosage was 2.5 G - L~ (-1), pH solution is 4~8, the dosage of O_3 was 12.56 Mg - min~ (-1), 60 min reaction solution, UV296 and COD removal rate were above 98% and 88%. The mechanism analysis shows that the adsorption and catalysis of O_3 catalyst to produce OH amount common The effect of ozonization degradation is affected.

【作者单位】：山东农业大学化学与材料科学学院;
【基金】：山东省科技发展计划(2013GZX20109)资助项目
【分类号】：X703;O643.36
【正文快照】： 1引言臭氧(O3)以其强氧化性[1]和不产生二次污染等优势,在饮用水消毒、去除异味和脱色方面得到广泛应用,但在含有毒、难降解有机物污水处理方面应用很少,主要是因为臭氧在水中相对低的溶解度和不稳定性及O3氧化的选择性限制了其应用范围[2]。分子O3对有机物的氧化选择性导致部

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