改性黄铁矿烧渣催化臭氧氧化水中活性黑5

Ozonation of Aqueous Reactive Black 5 Catalyzed by Modified PyC

摘要:

采用优化的浸渍法制备负载铈的黄铁矿烧渣（CePyC）以提高黄铁矿烧渣的臭氧氧化催化活性.研究表明,pH在3 ~ 10范围内,O3/CePyC体系对TOC去除率均维持在80 %左右，反应速率常数相比于单独臭氧氧化提高7.22倍，克服了传统臭氧氧化对有机污染物矿化率低,反应受pH影响大的局限性.催化剂性质稳定，重复利用3次后TOC去除率仍在75 %以上.表面羟基是PyC催化活性的关键，负载Ce后其催化活性显著增强，能够促进O3分解生成HO·而加速水中有机物的矿化.

Abstract:

Pyrite Cinder（PyC）supported Ce by optimized incipient wetness impregnation was prepared to enhance the catalytic activity of PyC in ozonation. TOC removal efficiency of O3/Ce PyC was kept at about 80 % in the pH range of 3 to 10 in the degradation of aqueous Reactive Black 5（RB5）which was quiet different from the case of traditional ozonation. The kinetic analysis showed that the TOC removal rate constant of O3/Ce PyC was 7.22 times higher than that of O3 alone in the degradation of RB5. Moreover, the fact that more than 75 % of TOC removal efficiency while the catalyst was reused for the third time indicated stable catalytic activity of Ce PyC. Surface hydroxyl groups were the key to catalytic activity of PyC while supported Ce enhanced its catalytic activity for its effectiveness in decomposing O3 into HO·. Ce PyC showed its potential application value in wastewater treatment considering the low cost.