AgBr/C_(3)N_(5)复合材料可见光去除无机废水中氨氮  

Removal of ammonia nitrogen from inorganic wastewater by AgBr/C_(3)N_(5) heterojunction under visible light irradiation

作　　者：朱炳生[1] Bingsheng Zhu(Yichun Vocational and Technical College,Yichun,Jiangxi 336000,China)

机构地区：[1]宜春职业技术学院,江西宜春336000

出　　处：《日用化学工业（中英文）》2024年第12期1473-1480,共8页China Surfactant Detergent & Cosmetics

摘　　要：通过原位沉淀法将AgBr原位沉淀到富氮氮化碳(C_(3)N_(5))表面,制备了AgBr/C_(3)N_(5)复合材料,通过X射线衍射(XRD)、傅里叶红外光谱(FTIR)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-vis DRS)和光致发光光谱(PL)等技术手段对复合材料的物相晶型、化学组成、元素组成、光谱吸收和光电子-空穴分离进行了表征分析。AgBr和C_(3)N_(5)异质结的构建使得光谱响应范围拓宽,实现了光电子-空穴的高效分离,提升了光催化性能。使用NH_(4)Cl溶液模拟无机氨氮废水研究复合材料的光催化性能,复合材料投加量为0.10 g,NH_(4)Cl溶液初始质量浓度100 mg/L,初始pH=10.0,模拟可见光照射60 min复合材料对氨氮的去除率达到了90.27%,循环使用5次后氨氮的去除率仅仅降低了0.12%,复合材料表现出良好的光催化性能和稳定性。Z-scheme机理有效保留了光电子和空穴的还原和氧化活性,将O_(2)和H2O分别还原和氧化为超氧自由基(·O_(2)-)和羟基自由基(·OH)等活性基团,实现了无机氨氮的高效去除。AgBr/C_(3)N_(5)composite was prepared by in-situ precipitation of AgBr on the surface of nitrogen-rich carbon nitride(C_(3)N_(5)).The crystal phase,chemical composition,elemental composition,spectral absorption and photoelectron-hole separation of the composite were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis DRS)and photoluminescence spectroscopy(PL).The construction of AgBr and C_(3)N_(5)heterojunction could broaden the spectral response range,realize the efficient separation of photoelectrons and holes,and thus improve the photocatalytic performance.The photocatalytic performance of the composite material was studied by simulating inorganic ammonia nitrogen wastewater with NH_(4)Cl solution.The dosage of the composite material was 0.10 g,the initial mass concentration of NH_(4)Cl solution was 100 mg/L,and the initial pH was 10.0.The removal rate of ammonia nitrogen by the composite material reached 90.27%after 60 min of simulated visible light irradiation.After 5 cycles,the removal rate of ammonia nitrogen only declined by 0.12%.The composite material showed good photocatalytic performance and stability.The Z-scheme mechanism effectively retained the reduction and oxidation activities of photoelectrons and holes,which could change O_(2)and H_(2)O to active groups such as superoxide radicals(·O_(2)-)and hydroxyl radicals(·OH),respectively,achieving efficient removal of inorganic ammonia nitrogen.

关 键 词：富氮氮化碳 复合材料 可见光 无机氨氮 

分 类 号：O643.3[理学—物理化学]