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

无机盐工业 ›› 2025, Vol. 57 ›› Issue (4): 118-127.doi: 10.19964/j.issn.1006-4990.2024-0351

• 催化材料 • 上一篇    下一篇

S-scheme活性炭负载g-C3N4/TiO2光催化混凝土降解性能分析

张典()   

  1. 濮阳职业技术学院建筑工程学院,河南 濮阳 457000
  • 收稿日期:2024-06-21 出版日期:2025-04-10 发布日期:2024-07-17
  • 作者简介:张典(1989— ),男,学士,讲师,主要研究方向为环保建筑材料的开发和应用;E-mail:zhangdian198906@163.com
  • 基金资助:
    河南省重点科技攻关计划项目(152102310312)

Degradation performance analysis of S-scheme activated carbon supported g-C3N4/TiO2 photocatalytic concrete

ZHANG Dian()   

  1. Architectural Engineering Institute,Puyang Vocational and Technical College,Puyang 457000,China
  • Received:2024-06-21 Published:2025-04-10 Online:2024-07-17

摘要:

为了解决抗生素废水污染和室内装修低浓度甲醛污染,采用简易的混合高温煅烧法制备了活性炭负载g-C3N4/TiO2(g-C3N4/TiO2/AC)复合光催化剂。通过XRD、XPS、TEM、UV-vis DRS和PL等技术对复合光催化剂的物相晶型、元素组成、微观形貌、光谱响应范围和光生载流子重组等进行了表征。S-scheme异质结弯曲能带和内电场实现了光生载流子的高效分离,拓宽了光谱吸收范围,有效保留了高活性的·O2-、h+和·OH等活性基团,表现出优异的磺胺甲基噻唑(STZ)降解活性和稳定性,g-C3N4/TiO2/AC投加量为1.0 mg和STZ初始质量浓度为100 mg/L条件下,可见光照射30 min时STZ降解率为98.8%,明显优于g-C3N4、TiO2和TiO2/AC。g-C3N4/TiO2/AC掺杂到环氧树脂涂料中合成了光催化涂料,通过空气喷枪均匀喷涂到混凝土表面得到光催化混凝土,光催化混凝土表现出良好的甲醛降解活性和稳定性,g-C3N4/TiO2/AC负载量为3%、甲醛初始质量浓度为1 000 mg/L、可见光照射180 min时,甲醛降解率达到了96.3%,有效实现了室内装修低浓度甲醛气体的高效降解。

关键词: g-C3N4, TiO2, 光催化, 混凝土, S-scheme电荷转移机制, 抗生素降解, 室内装修甲醛降解

Abstract:

In order to solve the antibiotic wastewater pollution and indoor decoration low concentration formaldehyde pollution,activated carbon supported g-C3N4/TiO2(g-C3N4/TiO2/AC) composite photocatalyst was prepared by a simple mixed high temperature calcination method.The crystal phase,elemental composition,microstructure,spectral response range and photogenerated carrier recombination of the composite photocatalyst were characterized by XRD,XPS,TEM,UV-vis DRS and PL techniques.The bending band and internal electric field of S-scheme heterojunction realized the efficient separation of photogenerated carriers,broadened the spectral absorption range,and effectively retained the active groups such as ·O2-,h+ and ·OH,showing excellent degradation activity and stability of sulfamethoxazole(STZ).Under the conditions of 1.0 mg g-C3N4/TiO2/AC dosage and 100 mg/L STZ initial concentration,the degradation rate of STZ was 98.8% within 30 min under visible light irradiation,which was significantly better than that of g-C3N4,TiO2 and TiO2/AC.Photocatalytic coatings were synthesized by doping g-C3N4/TiO2/AC into epoxy resin coatings.Photocatalytic concrete was uniformly sprayed onto the surface of concrete by air spray gun.Photocatalytic concrete showed good formaldehyde degradation activity and stability.The loading of g-C3N4/TiO2/AC was 3%,the initial concentration of formaldehyde was 1 000 mg/L,and the degradation rate of formaldehyde reached 96.3% within 180 min of visible light irradiation,which effectively realized the efficient degradation of low concentration formaldehyde gas in interior decoration.

Key words: g-C3N4, TiO2, photocatalysis, concrete, S-scheme charge transfer mechanism, antibiotic degradation, indoor decoration formaldehyde degradation

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