曙红Y后修饰Zr-MOF及光化学清除Cr(Ⅵ)离子和活性染料  

Eosin Y post-modified Zr-MOF and photochemical decontamination of Cr(VI)ions and reactive dyes

作　　者：王洋 刘洁 秦颖彤 翟薇丽 李庆[1] WANG Yang;LIU Jie;QIN Yingtong;ZHAI Weili;LI Qing(School of Environmental&Chemical Engineering,Xi’an Polytechnic University,Xi’an 710048,China;School of Textile Science and Engineering,Xi’an Polytechnic University,Xi’an 710048,China)

机构地区：[1]西安工程大学环境与化学工程学院,陕西西安710048 [2]西安工程大学纺织科学与工程学院,陕西西安710048

出　　处：《纺织高校基础科学学报》2025年第1期93-102,共10页Basic Sciences Journal of Textile Universities

基　　金：国家自然科学基金面上项目(22078253);陕西省重点研发计划项目(2024GX-YBXM-322,2024GX-YBXM-326);西安工程大学研究生创新基金(chx2024022)。

摘　　要：为了开发能够高效光催化还原Cr(Ⅵ)和降解活性染料的新型双功能光催化剂,将光敏剂曙红Y(EY)原位内嵌于Zr-MOF中,制备了新型EY@Zr-MOF材料。通过X射线衍射、傅里叶变换红外光谱和扫描电镜等对其进行结构和形貌表征,并探究其光催化还原Cr(Ⅵ)和降解活性深蓝K-R(K-R)的效能。结果显示:在500 W汞灯下,Cr_(2)O_(7)^(2-)的浓度在70 min内从27.99 mg/L降至0.57 mg/L,光催化还原效率为97.94%,还原速率常数为0.0495 min^(-1);相同条件下,360 min内K-R的质量浓度从12.89 mg/L降至0.18 mg/L,光催化降解效率和反应速率常数分别达到98.60%和0.01038 min^(-1)。瞬态光电流响应(TPR)、电化学阻抗(EIS)及电子顺磁共振波谱(EPR)分析发现,光电流强度提升及界面电阻降低是EY@Zr-MOF光催化性能提升的原因;光激发下产生的电子及超氧自由基(·O_(2)^(-))对驱动光催化氧化还原反应起重要作用。In order to develop a novel bi-functional photocatalyst capable of efficient photocatalytic reduction of Cr(VI)and degradation of reactive dyes,the photosensitizer Eosin Y(EY)was in-situ embedded in Zr-MOF with high water stability,and a novel EY@Zr-MOF material was successfully prepared.Its structure and morphology were characterized by PXRD,FT-IR and SEM,and the photocatalytic activity involving reduction of Cr(VI)and degradation of reactive dark blue K-R(K-R)were investigated.It was found that EY@Zr-MOF can reduce the concentration of Cr_(2)O_(7)^(2-)from 27.99 mg/L to 0.57 mg/L within 70 min,under the irradiation of 500 W mercury lamp,enabling the photocatalytic reduction efficiency of as high as 97.94%and the catalytic reduction rate constant of 0.0495 min^(-1).Under the identical conditions,the concentration of K-R also decreased from 12.89 mg/L to 0.18 mg/L within 360 min under the photochemical drive of EY@Zr-MOF,resulting in the photocatalytic degradation efficiency and reaction rate constant of 98.60%and 0.01038 min^(-1),respectively.Transient photocurrent response(TPR),electrochemical impedance(EIS)and electron paramagnetic resonance spectroscopy(EPR)analysis show that the increase of photocurrent intensity and the decrease of interfacial resistance are the reasons for the improvement of EY@Zr-MOF′s photocatalytic performance.The electrons and superoxide free radicals(·O_(2)^(-))play an important role in driving the photocatalytic REDOX reaction.

关 键 词：Zr-有机框架 后修饰 光催化还原及降解 Cr(Ⅵ)和活性染料 

分 类 号：TS190.2[轻工技术与工程—纺织化学与染整工程]