原位合成有序介孔氧化铝负载Cu-Ce催化剂及其维埃斯吸附消毒性能

Synthesis of Cu-Ce catalysts supported on ordered mesoporous alumina and its performance in VS decontamination

以三嵌段共聚物F127(EO_(106)PO_(70)EO_(106))为模板剂,Al[OCH(CH_(3))_(2)]_(3)为铝源,活性组分前体Cu(NO_(3))_(2)·2.5H_(2) O和Ce(NO_(3))2·6H_(2) O,采取原位合成法制备有序介孔氧化铝负载的Cu-Ce催化剂,研究合成的有序介孔氧化铝及催化剂对维埃斯(VS)的消毒效果。结果表明,VS在Al-0.05Cu-0.05Ce双金属催化剂表面的消毒降解效果最佳,产物中氧化物相对较多,主要发生S—C键和P—S键的断裂,断裂的碎片进一步氧化,反应4天,VS消毒降解率98.01%。这可能是由于CeO_(2)中的铈元素能受环境影响在Ce^(3+)→Ce^(4+)间发生可逆转变,催化VS发生氧化消毒反应。

The one-pot synthesis of copper,cesium-containing catalysts supported on ordered mesoporous alumina via self-assembly of Cu-Ce precursor[Cu(NO_(3))_(2)·2.5H_(2)O and Ce(NO_(3))_(2)·6H_(2) O]and aluminum isopropoxide in the presence of triblock copolymer(as a structure directing agent)was investigated in this paper.The sorption and decontamination of VS over synthesised copper,cesium-containing catalysts and ordered mesoporous alumina was studied.The results show that the degradation efficiency of VS was the highest over Al-0.05Cu-0.05Ce bimetal catalyst,which was 98.01%after 4 days of reaction.There are relatively more oxidation products on Al-0.05Cu-0.05Ce,the reaction mainly occurs in the rupture of S—C bonds and P—S bonds,and the broken fragments would be combined or oxidated further.This may be due to the fact that the cerium element in CeO_(2) can undergo a reversible transformation between Ce^(3+)and Ce^(4+)under the influence of the environment,and can catalyze the oxidation reaction of VS.