S-scheme活性炭负载g-C_(3)N_(4)/TiO_(2)光催化混凝土降解性能分析  

Degradation performance analysis of S-scheme activated carbon supported g-C_(3)N_(4)/TiO_(2)photocatalytic concrete

作　　者：张典 ZHANG Dian(Architectural Engineering Institute,Puyang Vocational and Technical College,Puyang 457000,China)

机构地区：[1]濮阳职业技术学院建筑工程学院,河南濮阳457000

出　　处：《无机盐工业》2025年第4期118-127,共10页Inorganic Chemicals Industry

基　　金：河南省重点科技攻关计划项目(152102310312)。

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-C_(3)N_(4)/TiO_(2)(g-C_(3)N_(4)/TiO_(2)/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·O_(2)^(-)、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-C_(3)N_(4)/TiO_(2)/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-C_(3)N_(4)、TiO_(2)和TiO_(2)/AC。g-C_(3)N_(4)/TiO_(2)/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-C_(3)N_(4)/TiO_(2)/AC负载量为3%、甲醛初始质量浓度为1000 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。In order to solve the antibiotic wastewater pollution and indoor decoration low concentration formaldehyde pollution,activated carbon supported g-C_(3)N_(4)/TiO_(2)(g-C_(3)N_(4)/TiO_(2)/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·O_(2)-,h+and·OH,showing excellent degradation activity and stability of sulfamethoxazole(STZ).Under the conditions of 1.0 mg g-C_(3)N_(4)/TiO_(2)/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-C_(3)N_(4),TiO_(2)and TiO_(2)/AC.Photocatalytic coatings were synthesized by doping g-C_(3)N_(4)/TiO_(2)/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-C_(3)N_(4)/TiO_(2)/AC was 3%,the initial concentration of formaldehyde was 1000 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.

关 键 词：g-C_(3)N_(4) TiO_(2) 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 

分 类 号：O643.36[理学—物理化学]