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

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/Ce-PyC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.

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 03/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 03/Ce-PyC was 7.22 times higher than that of 03 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.