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我国粹者研制出可疾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 文章泉源:《纳米标准》
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抗生素滥用招致的生态情况和生物平安题目,已惹起普遍存眷。近期,中科院合肥物质迷信研讨院智能机器研讨所刘锦淮课题组孔令涛研讨团队设计出一种新鲜可控的催化剂,完成了在宽酸碱度范畴内对立生素的高效降解。英国皇家化学会着名学术期刊《纳米标准》(Nanoscale)日前宣布了这一效果。

由于人和植物每每不克不及将服用的抗生素完全吸取,少量的抗生素以代谢产品乃至原态方式排入情况中,招致病原微生物发生耐药性,进而使敏感菌耐药性加强。四环素作为一种典范的抗生素,在被人体摄入后,难以被肠胃彻底吸取,约75%的剂量以母体化合物的方式被人体排挤,对生态情况和生物平安形成严重潜伏要挟。

芬顿技能可以完成无机物的高效降解,但惯例的芬顿反响需求在强酸条件下才干发扬作用,在实践使用中遭到限定。近期,孔令涛研讨团队经过技能攻关,乐成制备出一种形貌可控的催化剂,该催化剂对进步芬顿体系降解四环素的服从有明显作用,还将反响的最优酸碱度范畴拓宽至中性。

据引见,该项研讨细致讨论了催化降解机理,揣测出能够的四环素降解道路,处理了四环素的难降解题目,拓宽了类芬顿反响的酸碱度使用范畴,具有普遍的使用远景。(泉源: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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