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我国学者研制出可快速降解水中抗生素新型催化剂
更新日期: 2019-01-28 作者: 孔令涛等 文章来源:《纳米尺度》
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抗生素滥用导致的生态环境和生物安全问题,已引起广泛关注。近期,中科院合肥物质科学研究院智能机械研究所刘锦淮课题组孔令涛研究团队设计出一种新颖可控的催化剂,实现了在宽酸碱度范围内对抗生素的高效降解。英国皇家化学会知名学术期刊《纳米尺度》(Nanoscale)日前发表了这一成果。

由于人和动物往往不能将服用的抗生素完全吸收,大量的抗生素以代谢产物甚至原态形式排入环境中,导致病原微生物产生耐药性,进而使敏感菌耐药性增强。四环素作为一种典型的抗生素,在被人体摄入后,难以被肠胃彻底吸收,约75%的剂量以母体化合物的形式被人体排出,对生态环境和生物安全造成重大潜在威胁。

芬顿技术可以实现有机物的高效降解,但常规的芬顿反应需要在强酸条件下才能发挥作用,在实际应用中受到限制。近期,孔令涛研究团队通过技术攻关,成功制备出一种形貌可控的催化剂,该催化剂对提高芬顿体系降解四环素的效率有显著作用,还将反应的最优酸碱度范围拓宽至中性。

据介绍,该项研究详细讨论了催化降解机理,推测出可能的四环素降解路线,解决了四环素的难降解问题,拓宽了类芬顿反应的酸碱度应用范围,具有广泛的应用前景。(来源:新华社 徐海涛 张紫赟)

 

Morphology-tunable WMoO nanowire catalysts for the extremely efficient elimination of tetracycline: kinetics, mechanisms and intermediates

 

Abstract  The presence of antibiotics in aquatic environments has attracted global concern. The Fenton system is one of the most popular methods for eliminating antibiotics in aquatic environments, but the existing Fenton system is limited due to the potential for secondary pollution, and the narrow pH range (~3–5). In this study, we report that the bottlenecks for high-strength tetracycline (TC) wastewater treatment under neutral conditions can be tackled well by a class of mixed-valence W/Mo containing oxides (WMoO-x) with tunable morphologies. Triethanolamine was selected as a structure-directing agent to control the morphologies of the catalysts going from ultrathin nanowires (UTNWs) to wire-tangled nanoballs (WTNBs). As a proof of concept, the most efficient catalyst in the batch samples, WMoO-1 ultrathin nanowires, was employed as a model material for TC degradation, in which the coordinatively unsaturated metal atoms with oxygen defects serve as the sites for TC chemisorption and electron transfer. As a result, 91.75% of TC was degraded in 60 min for the initial TC concentration of 400 μM. Furthermore, LC-MS analysis confirmed that the TC could be degraded to nontoxic by-products without benzene rings, and finally mineralized to CO2 and H2O. ICP-MS and cycle experiments showed the good stability and reusability of WMoO-1 UTNWs in the Fenton-like system. The findings of this work provide fresh insights into the design of nanoscale catalyst morphology and reaffirm the versatility of doping in tuning catalyst activity, extending the range of the optimal pH values to neutral conditions. This is significant for the expansion of the heterogeneous Fenton-like family and its application in the field of water treatment.

 

原文链接:https://pubs.rsc.org/en/content/articlepdf/2019/nr/c8nr08162j

 


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