Ag3PO4/MIL-125(Ti) Z型异质结的构建及其光催化还原Cr(VI)的性能

doi:10.11901/1005.3093.2022.669

材料研究学报

2023, Vol. 37

Issue (11): 871-880 DOI: 10.11901/1005.3093.2022.669

研究论文

本期目录 | 过刊浏览

Ag₃PO₄/MIL-125(Ti) Z型异质结的构建及其光催化还原Cr(VI)的性能

孙玉伟¹^,², 陈畴¹, 祁昕¹, 任楚奇¹, 汤茜¹^,², 滕洪辉¹^,²(

), 任百祥¹^,²

^1.吉林师范大学工程学院四平 136000
^2.吉林省高校环境材料与污染控制重点实验室四平 136000

Synthesis of Z-scheme Ag₃PO₄/MIL-125(Ti) Heterojunction and Its Performance in Photocatalytic Reduction of Cr(VI)

SUN Yuwei¹^,², CHEN Chou¹, QI Xin¹, REN Chuqi¹, TANG Qian¹^,², TENG Honghui¹^,²(

), REN Baixiang¹^,²

^1.College of Engineering, Jilin Normal University, Siping 136000, China
^2.Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Siping 136000, China

引用本文:

孙玉伟, 陈畴, 祁昕, 任楚奇, 汤茜, 滕洪辉, 任百祥. Ag₃PO₄/MIL-125(Ti) Z型异质结的构建及其光催化还原Cr(VI)的性能[J]. 材料研究学报, 2023, 37(11): 871-880.
Yuwei SUN, Chou CHEN, Xin QI, Chuqi REN, Qian TANG, Honghui TENG, Baixiang REN. Synthesis of Z-scheme Ag₃PO₄/MIL-125(Ti) Heterojunction and Its Performance in Photocatalytic Reduction of Cr(VI)[J]. Chinese Journal of Materials Research, 2023, 37(11): 871-880.

全文: PDF(7889 KB) HTML

摘要:

将Ag₃PO₄纳米颗粒原位沉积在圆饼状MIL-125(Ti)的表面制备出Ag₃PO₄/MIL125(Ti) Z型异质结光催化剂，分别用XRD、SEM、EDS、UV-vis、FTIR、EIS和PL等手段表征其晶相结构、形貌特征、光吸收性能、价带结构和电荷分离效率，研究了在模拟太阳光照射下Ag₃PO₄沉积量不同的Ag₃PO₄/MIL125(Ti)光催化剂还原Cr(Ⅵ)的性能，以及在光催化过程中初始溶液的pH值和催化剂投加量等的影响。结果表明，Ag₃PO₄的沉积有效提高了MIL-125(Ti)光催化还原性能。Cr(VI)溶液初始浓度为10 mg/L、pH为2时，Ag₃PO₄/MIL-125(Ti)-2对Cr(VI)的还原率可以达到96.9%。带隙结构计算和自由基捕获实验的结果表明， Ag₃PO₄/MIL-125(Ti)中的光生载流子符合Z型转移机制。

关键词 ：无机非金属材料, MIL-125(Ti), Ag₃PO₄, Z型异质结, 光催化, 还原Cr(VI)

Abstract：

A composite of Z-scheme Ag₃PO₄/MIL-125(Ti) heterojunction was synthesized by loading Ag₃PO₄ nano particles on the surface of round-shaped MIL-125(Ti). The Ag₃PO₄/MIL-125(Ti) composite can effectively improve the utilization of light and charge separation efficiency. The crystal-structure, morphology, optical absorption, valence band structure and charge separation efficiency of the prepared Ag₃PO₄/MIL-125(Ti) composite were characterized by XRD、SEM、EDS、UV-vis、FTIR、EIS and PL testing methods. Under a simulated solar irradiation, the performance of Cr(VI) reduction by Ag₃PO₄/MIL125(Ti) composite with different deposition amounts of Ag₃PO₄ was studied. Furthermore, the effect of solution pH and catalyst dosage in the photocatalytic reduction process was also discussed. The photocatalytic test results indicated that the deposition of Ag₃PO₄ effectively improved the photocatalytic reduction performance of MIL-125(Ti). When the concentration of Cr(VI) solution was 10mg/L and pH was 2, the reduction rate of Cr(VI) by Ag₃PO₄/MIL-125(Ti)-2 could reach to 96.9%. The results of bandgap structure calculation and free radical trapping experiments show that photon-generated carriers in Ag₃PO₄/MIL-125(Ti) are conformed to Z-scheme mechanism.

Key words： inorganic non-metallic materials MIL-125 (Ti) Ag₃PO₄ Z-scheme heterojunction photocatalytic reduction of Cr(VI)

收稿日期: 2022-12-19

ZTFLH:

X703.1

基金资助:吉林省科技厅项目(YDZJ202201ZYTS368);吉林省科技厅项目(20210101391JC);吉林省教育厅项目(JJKH20220451KJ);吉林省教育厅项目(JJKH20230517KJ)

通讯作者: 滕洪辉，教授，hhteng2022@163.com，研究方向为工业废水处理

Corresponding author: TENG Honghui, Tel: 13944400855, E-mail: hhteng2022@163.com

作者简介: 孙玉伟，女，1986年生，副教授，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.669 或 https://www.cjmr.org/CN/Y2023/V37/I11/871

图1 不同样品的XRD谱

图2 不同样品的SEM形貌和Ag3PO4/MIL125(Ti)-2的EDS能谱

图3 不同样品的紫外-可见漫反射光谱、(αhv)1/2与hv的曲线、MIL-125(Ti)和Ag3PO4的VB谱以及MIL125(Ti)和Ag3PO4的能带结构

图4 不同样品的红外光谱

图5 不同样品的EIS谱和PL光谱

图6 不同样品光催化还原性能和光催化还原Cr(VI)的一级动力学曲线

图7 不同初始pH值对光催剂还原性能的影响、不同投加量对光催剂还原性能的影响以及不同有机酸对光催化剂还原性能的影响

表1 不同MOFs基光催化剂去除Cr(VI)活性的比较

图8 光催化循环性能和光催化反应前后Ag3PO4/MIL-125(Ti)-2的XRD谱

图9 活性物种的捕获性能

图10 Ag3PO4/MIL-125(Ti)的光催化还原Cr(VI)机制

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