Doping of biogenic Pd catalysts with Au enables dechlorination of diclofenac at environmental conditions

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• 作者：Simon De Corte^a ; Tom Sabbe^a ; Tom Hennebel^a ; Lynn Vanhaecke^b ; Bart De Gusseme^a ; Willy Verstraete^a ; Nico Boon^a ; ^{Nico.Boon@UGent.be}
• 关键词：Bimetallic catalysts ; Biogenic metals ; Dehalogenation ; Diclofenac
• 刊名：Water Research
• 出版年：2012
• 期刊代码：57_00431354
• 类别：civ
• 出版时间：15 May, 2012
• 卷：46
• 期：8
• 页码：2718-2726
• 文件大小：743 K

摘要

By using the metal reducing capacities of bacteria, Pd nanoparticles can be produced in a sustainable way (鈥榖io-Pd鈥?. These bio-Pd nanoparticles can be used as a catalyst in, for example, dehalogenation reactions. However, some halogenated compounds are not efficiently degraded using a bio-Pd catalyst. This study shows that the activity of bio-Pd can be improved by doping with Au(0) (鈥榖io-Pd/Au鈥?. In contrast with bio-Pd, bio-Pd/Au could perform the removal of the model pharmaceutical compound diclofenac from an aqueous medium in batch experiments at neutral pH and with H₂ as the hydrogen donor (first order decay constant of 0.078聽卤聽0.009聽h^鈭?). Dehalogenation was for both catalysts the only observed reaction. For bio-Pd/Au, a disproportional increase of catalytic activity was observed with increasing Pd-content of the catalyst. In contrast, when varying the Au-content of the catalyst, a Pd/Au mass ratio of 50/1 showed the highest catalytic activity (first order decay value of 0.52聽卤聽0.02聽h^鈭?). The removal of 6.40聽渭g聽L^鈭? diclofenac from a wastewater treatment plant effluent using bio-Pd was not possible even after prolonged reaction time. However, by using the most active bio-Pd/Au catalyst, 43.8聽卤聽0.5%of the initially present diclofenac could be removed after 24聽h. This study shows that doping of bio-Pd nanoparticles with Au(0) can be a promising approach for the reductive treatment of wastewaters containing halogenated contaminants.