摘要
采用原位生长法制备Ag_(3)PO_(4)/g-C_(3)N_(4)异质结催化剂,在可见光照射下,催化氧化降解废水中的药物大分子黄连素。通过X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-vis DRS)分析催化剂的组成和结构,并测试了Ag_(3)PO_(4)/g-C_(3)N_(4)降解黄连素的光催化活性。结果表明:利用可见光照射,g-C_(3)N_(4)掺杂量为0.7 g时,Ag_(3)PO_(4)/g-C_(3)N_(4)对黄连素的光催化降解活性最好,可见光反应15 min降解率达到100%,重复4次实验后降解率降至73.2%,其具有较好的光稳定性。自由基捕获实验证明h^(+)和·O^(-)_(2)在降解黄连素废水中起主要作用,结合UV-vis DRS分析可知,Ag_(3)PO_(4)/g-C_(3)N_(4)遵循Z型异质结机理。
Ag_(3)PO_(4)/g-C_(3)N_(4) heterojunction catalyst was synthetized by in-situ growth method,and under visible light emission,the degradation of medicine macromolecular berberine in wastewater was catalyzed oxidation.The composition and structure of the catalyst were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and ultraviolet visible diffuse reflectance spectroscopy(UV-vis DRS).The photocatalytic activity of Ag_(3)PO_(4)/g-C_(3)N_(4) for the degradation of berberine was tested.The results showed that when the doping amount of g-C_(3)N_(4) was 0.7 g,the photocatalytic degradation activity of Ag_(3)PO_(4)/g-C_(3)N_(4) for berberine was the best under visible light irradiation.The degradation rate reached 100%after 15 min of visible light reaction.After four repeated experiments,the degradation rate was decreased to 73.2%,which had good light stability.Free radical capture experiments showed that h^(+) and·O^(-)_(2)played major role in the degradation of berberine wastewater.Combined with UV-vis DRS analysis,Ag_(3)PO_(4)/g-C_(3)N_(4) followed the Z-type heterojunction mechanism.
作者
汲畅
王国胜
JI Chang;WANG Guosheng(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2022年第4期175-180,共6页
Inorganic Chemicals Industry
