无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
催化材料

C3N5/NH2-MIL-125(Ti)改性混凝土砂浆光催化和力学性能研究

  • 刘光明
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  • 中铁城建集团第一工程有限公司,山西 太原 030000
刘光明(1986— ),男,学士,高级工程师,主要从事施工现场质量管理和新型混凝土材料的研发;E-mail:liuguangming198606@yeah.net

收稿日期: 2024-04-09

  网络出版日期: 2025-01-24

Study on photocatalytic and mechanical properties of C3N5/NH2-MIL-125(Ti) modified concrete mortar

  • LIU Guangming
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  • China Railway Urban Construction Group First Engineering Company Limited,Taiyuan 030000,China

Received date: 2024-04-09

  Online published: 2025-01-24

摘要

为了解决有机染料和汽车尾气NO x 对环境造成的污染,通过溶剂热法制备了C3N5/NH2-MIL-125(Ti)复合光催化材料。通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-vis DRS)、稳态荧光光谱(PL)和电化学交流阻抗谱(EIS)等表征技术对复合材料的晶型形貌、元素组成、光谱吸收、光电子-空穴复合和电荷传质阻力等进行了表征。应用于染料罗丹明B(RhB)的光催化降解,通过C3N5/NH2-MIL-125(Ti)实现对混凝土砂浆的内掺改性,应用于汽车尾气NO x 的光催化降解。结果表明:XPS表征证明了C3N5和NH2-MIL-125(Ti)之间异质结的成功构建,实现了光电子-空穴的高效分离,光谱吸收范围拓宽,电荷传质阻力显著降低,表现出良好的光催化活性,明显优于单一的C3N5和NH2-MIL-125(Ti),可见光照射60 min内RhB降解率达到了98.5%,且循环使用5次仍表现出良好的光催化活性。C3N5/NH2-MIL-125(Ti)的少量掺杂使得普通混凝土砂浆表现出NO x 降解活性,且有利于砂浆混凝土抗压强度的提升。

本文引用格式

刘光明 . C3N5/NH2-MIL-125(Ti)改性混凝土砂浆光催化和力学性能研究[J]. 无机盐工业, 2025 , 57(1) : 120 -128 . DOI: 10.19964/j.issn.1006-4990.2024-0201

Abstract

In order to solve the environmental pollution caused by organic dyes and automobile exhaust NO x,C3N5/NH2-MIL-125(Ti) composite photocatalytic materials were prepared by solvothermal method.The crystal morphology,elemental composition,spectral absorption,photoelectron-hole recombination and charge transfer resistance of the composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis DRS),steady-state fluorescence spectroscopy(PL) and electrochemical impedance spectroscopy(EIS).It was applied to the photocatalytic degradation of dye rhodamine B(RhB).The concrete mortar was modified by C3N5/NH2-MIL-125(Ti),which was applied to the photocatalytic degradation of automobile exhaust NO x .The results showed that the XPS characterization proved the successful construction of the heterojunction between C3N5 and NH2-MIL-125(Ti),realized the efficient separation of photoelectron-holes,broadened the spectral absorption range,and significantly reduced the charge transfer resistance,showing good photocatalytic activity,which was obviously better than that of single C3N5 and NH2-MIL-125(Ti).The degradation rate of RhB reached 98.5% within 60 min under visible light irradiation,and it still showed good photocatalytic activity after 5 cycles.A small amount of doping of C3N5/NH2-MIL-125(Ti) made ordinary concrete mortar exhibited NO x degradation activity and was beneficial to the improvement of compressive strength of mortar concrete.

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