PS协同Z型异质结二维BiOI/g-C_(3)N_(4)光催化降解四环素  

Photocatalytic degradation of tetracycline by PS synergizing with Z-type heterojunction two-dimensional BiOI/g-C_(3)N_(4)

作　　者：殷超 刘亚利[1] 吕舒怡 吕昕雅 YIN Chao;LIU Yali;LYU Shuyi;LYU Xinya(School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《精细化工》2022年第7期1457-1463,1480,共8页Fine Chemicals

基　　金：国家自然科学基金(51808282);江苏省自然科学基金(BK20160937)。

摘　　要：以三聚氰胺为前驱体,采用简单的热聚合法制备了超薄石墨相氮化碳(g-C_(3)N_(4)),并用原位沉积-沉淀法在g-C_(3)N_(4)表面生成BiOI,复合构筑了不同BiOI与g-C_(3)N_(4)质量比的二维BiOI/g-C_(3)N_(4)(2D/BiOI/g-C_(3)N_(4),BICN-x)Z型异质结。通过XRD、FTIR、SEM、HRTEM、BET、UV-Vis DRS对其结构、表面官能团、形貌、比表面积和光学性能进行了表征分析。探讨了过二硫酸盐(PS)对2D/BiOI/g-C_(3)N_(4)光催化降解四环素(TC)的影响。结果表明,BiOI与g-C_(3)N_(4)质量比为2∶1时,制备的BICN-3具有密切的界面耦合,其光生电子-空穴对分离效率较高,光生e-以更快的迁移速度到达结构表面,并且在LED照射60 min内,BICN-3(0.25 g/L)与PS(2.0 mmol/L)形成的催化体系(BICN-3/PS)对质量浓度为10 mg/L的四环素的降解率为88.2%,降解速率常数是单独BICN-3的3.82倍。Two-dimensional BiOI/g-C_(3)N_(4)(2D/BiOI/g-C_(3)N_(4),BICN-x)Z-type heterojunctions with different mass ratios of BiOI to g-C_(3)N_(4) were constructed via in situ deposition-precipitation of BiOI on the surface of ultra-thin graphitic phase carbon nitride(g-C_(3)N_(4)),which was synthesized by simple thermal polymerization of melamine.The structure,surface functional groups,morphology,specific surface area and optical properties of the samples were characterized and analyzed by XRD,FTIR,SEM,HRTEM,BET and UV-Vis DRS.Furthermore,the effect of persulfate(PS)on 2D/BiOI/g-C_(3)N_(4) photocatalytic degradation of tetracycline(TC)was investigated.The results showed that BICN-3 with a mass ratio of BiOI to g-C_(3)N_(4) of 2∶1 displayed higher separation efficiency of photoelectron-hole pair via close interfacial coupling,and faster migration speed of the photogenerated e-to the structure surface.The catalytic system formed by BICN-3(0.25 g/L)and PS(2.0 mmol/L)(BICN-3/PS)exhibited a degradation rate of 88.2% for TC at a mass concentration of 10 mg/L under LED irradiation for 60 min,and the degradation rate constant was 3.82-fold that of BICN-3 alone.

关 键 词：石墨相氮化碳 BiOI 过二硫酸盐 电子-空穴对 水处理技术 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]