S-scheme活性炭负载g-C3N4/TiO2光催化混凝土降解性能分析
收稿日期: 2024-06-21
网络出版日期: 2024-07-17
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
Received date: 2024-06-21
Online published: 2024-07-17
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。
张典 . S-scheme活性炭负载g-C3N4/TiO2光催化混凝土降解性能分析[J]. 无机盐工业, 2025 , 57(4) : 118 -127 . DOI: 10.19964/j.issn.1006-4990.2024-0351
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.
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