碳氯共掺杂介孔g-C_(3)N_(4)的气泡模板法制备及光催化性能

Preparation of carbon-chlorine co-doped mesoporous g-C 3N 4 by bubble template method and photocatalytic performance

以三聚氰胺、葡萄糖和氯化铵为原料制备一种具有高比表面积的碳氯共掺杂介孔g-C_(3)N_(4)(C-Cl-CN)光催化剂,并考察其光催化降解罗丹明B(RhB)的性能。采用XRD,XPS,SEM,UV-Vis DRS和PL测试手段表征和分析催化剂的晶型结构、化学组成及微观形貌。结果表明:C-Cl-CN具有最高的比表面积(108.7 m 2/g),降解RhB的速率常数达到0.02290 min^(-1),是纯g-C_(3)N_(4)的9.4倍,且具有良好的催化稳定性。葡萄糖和氯化铵在聚合过程中起到双气泡模板和元素掺杂剂的作用,一方面提升催化剂的比表面积,另一方面减小能带间隙,增强催化剂的光吸收性能。

A carbon-chlorine co-doped mesoporous g-C_(3)N_(4)(C-Cl-CN)photocatalyst with a high specific surface area was prepared from melamine,glucose and ammonium chloride and its performance for photocatalytic degradation of rhodamine B(RhB)was investigated.The crystal structure,chemical composition and micro-morphology of the catalysts were characterized by X-ray diffraction pattern(XRD),X-ray photoelectron spectroscope(XPS),scanning electron microscope(SEM),UV-Vis diffuse reflection spectra(UV-Vis DRS)and photoluminescence(PL).The results show that C-Cl-CN has a high specific surface area(108.7 m 2/g)and the rate constant of RhB degradation is 0.02290 min^(-1),which is 9.4 times higher than that of pure g-C_(3)N_(4),and has excellent catalytic stability.Glucose and ammonium chloride act as double-bubble templates and elemental dopants in the polymerization process,which enhance the specific surface area of the catalyst on the one hand and reduce the energy bandgap,on the other hand,significantly enhance the light absorption performance of the catalyst.