CuNiAl复合金属氧化物催化ClO2氧化处理苯酚废水

Treatment of phenol wastewater by ClO2 in the presence of CuNiAl complex metal oxide as catalyst

摘要:

采用共沉淀法合成CuNiAl类水滑石(CuNiAl-LDHs)，将水滑石在600℃下焙烧制备出高分散CuNiAl复合金属氧化物催化剂，用XRD、FT-IR和SEM对产品进行表征，并用CuNiAl复合金属氧化物催化ClO2氧化处理苯酚。研究结果表明：类水滑石中Cu、Ni、Al的配比影响类水滑石的晶型结构，当n(Cu):n(Ni):n(Al)=1:1:1，可以得到结晶度高、晶体单一的CuNiAl类水滑石，该水滑石焙烧得到的复合金属氧化物催化ClO2氧化处理苯酚废水，可促进废水中苯酚的深度降解，使COD去除率大大增加。适宜的反应条件是：催化剂投加量为3g/L，废水pH值7.0，反应时间60min，反应温度室温，废水COD去除率达到65％左右。

Abstract:

CuNiAl-LDHs were synthesized by coprecipitation method, and then the synthesized hydrotalcite-like were calcined under 600℃ to obtain the highly dispersed CuNiAl complex metal oxide as catalyst. The hydrotalcite-like compounds and complex metal oxides were characterized by FT-IR XRD and SEM. Then CuNiAl complex metal oxide was used as catalyst in ClO2 catalytic oxidation of phenol. The crystalline structure of CuNiAl-LDHs varied with the ratio of Cu, Ni and Al, and CuNiAl-LDHs with Cu/Ni/Al molar ratio of 1:1:1 had high crystallinity and single structure. CuNiAl complex metal oxide prepared by calcining CuNiAl-LDHs with Cu/Ni/Al molar ratio of 1:1:1 can catalyze ClO2 catalytic oxidation of phenol and promote the deep degradation of phenol, resulting in the increase of COD removal ratio. The COD removal ratio can reach 65% in the condition of 3g/L catalyst, pH 7.0, reaction time 60min and room temperature.