3D花状MoS_(2)/O-g-C_(3)N_(4) Z型异质结增强光催化剂降解双酚A  

3D flower-shaped MoS_(2)/O-g-C_(3)N_(4) Z-type heterojunction enhances the photocatalyst degradation of bisphenol A

作　　者：张家晶 郑永杰[1] 荆涛[1] 赵云鹏[1] 杨万丽[1] ZHANG Jiajing;ZHENG Yongjie;JING Tao;ZHAO Yunpeng;YANG Wanli(School of Chemistry and Chemical Engineering,Qiqihar University,Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学化学与化学工程学院,齐齐哈尔161006

出　　处：《复合材料学报》2022年第12期5778-5791,共14页Acta Materiae Compositae Sinica

基　　金：黑龙江省教育厅基本业务项目(135309109);黑龙江省教育厅基本业务项目(135209226);国家自然科学基金面上项目(52172092)。

摘　　要：光催化降解是一种很有应用前景的污染物处理方法。采用溶剂热法制备了3D/2D二硫化钼负载氧掺杂石墨相氮化碳(MoS_(2)/O-g-C_(3)N_(4))复合材料,通过XRD、XPS、SEM、TEM、FTIR和PL等表征了MoS_(2)与Og-C_(3)N_(4)之间Z型异质结的成功构建。在模拟太阳光下,当MoS_(2)的负载量为0.2%时,MoS_(2)/O-g-C_(3)N_(4)的光催化活性最高,双酚A(BPA)的降解率为92.6%,是纯g-C_(3)N_(4)的7倍。此外,MoS_(2)和O-g-C_(3)N_(4)之间界面的紧密接触和相互的协同效应,显著增强了光催化反应活性位点和可见光吸收能力,有效提高了光生载流子的分离。根据液相质谱联用仪(LC-MS)和自由基捕获实验,提出了0.2%MoS_(2)/O-g-C_(3)N_(4)异质结复合材料降解BPA可能的光催化降解机制。本研究为制备高效异质结光催化剂提供了新的方法。Photocatalytic degradation was considered as a promising strategy for the elimination of hazardousorganic pollutants.In this work,a binary 3D/2D molybdenum disulfide supported oxygen-doped graphite carbon nitride(MoS_(2)/O-g-C_(3)N_(4))heterojunctions was successfully fabricated by using a facile hydrothermal strategy.Meanwhile,the as-prepared photocatalysts were characterized by XRD,XPS,SEM,TEM,FTIR and PL.By these characterized observed the formation of Z-type heterojunction between MoS_(2) and O-g-C_(3)N_(4).Under visible light irradiation,when the loading of MoS_(2) was 0.2%,MoS_(2)/O-g-C_(3)N_(4) exhibited better photocatalytic activity,and the degradation rate of bisphenol A(BPA)is 92.6%,which is 7 times higher than that of pure g-C_(3)N_(4).In addition,the close contact and mutual synergistic effect of the interface between MoS_(2) and O-g-C_(3)N_(4) significantly enhance the photocatalytic reaction active sites and visible light absorption capacity,and effectively improve the separation of photogenerated carriers.Using liquid chromatography-mass spectrometry technology(LC-MS)and capturing experimental results,the possible photocatalytic mechanism of the 0.2%MoS_(2)/O-g-C_(3)N_(4) heterojunction composite material degrading crystal violet were proposed.This research provides a new method for the preparation of high-efficiency heterojunction photocatalysts.

关 键 词：MoS_(2) 石墨相氮化碳 Z型异质结 光催化 协同作用 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]