不同尺寸的AuNPs对废水中污染物的催化降解性能  

Catalytic degradation capability of AuNPs with different sizes to pollutants in wastewater

作　　者：杨林 石元峻 周昱君 YANG Lin;SHI Yuan-jun;ZHOU Yu-jun(School of Chemical Engineering,Shandong Institute of Petroleum and Chemical Technology,Dongying 257061,China)

机构地区：[1]山东石油化工学院化学工程学院,山东东营257061

出　　处：《化学研究与应用》2024年第4期795-802,共8页Chemical Research and Application

基　　金：山东省自然科学基金青年项目(ZR2022QB238)资助;东营市科学发展基金项目(DJB2021007)资助。

摘　　要：废水中难降解、强毒性污染物的处理仍是目前亟待解决的问题。金纳米颗粒(AuNPs)具有较大的比表面积、良好的催化活性和生物相容性,在废水处理领域获得广泛的关注。然而,AuNPs的催化活性受颗粒尺寸的影响较大。本文采用化学还原法制备出不同尺寸的AuNPs,并分别对废水中污染物铁氰化钾K_(3)Fe(CN)6和对硝基苯酚(4-NP)进行催化降解以探究AuNPs的催化活性。透射电镜(TEM)和紫外-可见吸收光谱(UVvis)表征结果显示,所制备的AuNPs具有与尺寸相关的催化活性,随尺寸的降低催化活性逐渐增强,4 nm的AuNPs能实现200 s内K_(3)Fe(CN)6和4-NP的快速还原,38 nm以上的AuNPs催化性能较低,且在小尺寸区间,催化活性变化更快。此外,AuNPs循环使用6次后仍保持50%以上的催化活性。The treatment of difficultly degradable and highly toxic pollutants in wastewater is an urgent problem to be solved.Gold nanoparticles(AuNPs)have gained intense attention in wastewater treatment due to large specific surface area,excellent catalytic activity and biocompatibility.However,the catalytic activity of AuNPs is greatly limited by the particle size.Herein,AuNPs with different sizes were prepared using chemical reduction method,whose catalytic activity was explored via the degradation of potassium ferricyanide K_(3)Fe(CN)_(6)。and 4-nitrophenol(4-NP)in wastewater.Transmission electron microscopy(TEM)and UV-visible absorption spectra characterization have demonstrated that the catalytic activity of the as-prepared AuNPs with dfferent sizes shows a trend of increase with the decrease of the size,which changes intensely in the range of small diameter,and 4 nm AuNPs can achieve the rapid reduction of K_(3)Fe(CN)_(6)and 4-NP within 200 s,as well as above 38 nm AuNPs have relatively low catalytic activity.Besides,AuNPs retain above 50%of catalytic activity after 6 reusages.

关 键 词：金纳米颗粒 催化活性 尺寸相关性 铁氰化钾 对硝基苯酚 

分 类 号：O614.1[理学—无机化学]