Cu_(1.94)S-SnS纳米异质结的合成及其光催化降解研究  

Synthesis and Photocatalytic Degradation of Cu_(1.9)4S-SnS Nano-heterojunction

作　　者：刘嘉文 林玮璜[1,2,3] 王惟嘉 郭学益[1,2,3] 杨英 Liu Jiawen;Lin Weihuang;Wang Weijia;Guo Xueyi;Yang Ying(School of Metallurgy and Environment,Central South University,Changsha 410083;Hunan Key Laboratory of Nonferrous Metal Resources Recycling,Central South University,Changsha 410083;National&Regional Joint Engineering Research Center of Nonferrous Metal Resources Recycling,Changsha 410083;Institute of Clinical Medicine(ICM),the Second Affiliated Hospital of Hainan Medical University,Haikou 570311)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]中南大学有色金属资源循环利用湖南省重点实验室,长沙410083 [3]中南大学有色金属资源循环利用国家地方联合工程中心,长沙410083 [4]海南医学院第二附属医院临床医学研究所,海口570311

出　　处：《化学学报》2023年第7期725-734,共10页Acta Chimica Sinica

基　　金：湖南省自然科学基金(No.2022JJ30757);清远市创新创业科研团队项目(No.2018001);广东省科技计划(No.2018B030323010);国家自然科学基金(No.52262040);海南省自然科学基金(No.821QN411)资助。

摘　　要：为提高光催化降解有害染料的活性,采用热注入-阳离子交换法合成了Cu_(1.94)S-SnS单颗粒纳米异质结构材料.探究在不同温度下(80, 120和160℃), Sn^(2+)作为客体离子进行阳离子部分交换所得产物的差异.通过高分辨率透射电子显微镜(HRTRM)图像、高角度环形暗场扫描透射电子显微镜(HAADF-STEM)图像、扫描透射电子显微镜能量色散光谱(STEM-EDS)、X射线衍射和X射线光电子能谱仪等分析手段对样品进行表征.紫外-可见-近红外吸收光谱表明,合成的Cu_(1.94)S-SnS纳米异质结构在可见光范围内具有更高的光吸收度.通过光催化降解亚甲基蓝和四环素,对产物的光催化性能进行表征,发现异质结结构有效提高了单一硫化物的光催化活性,亚甲基蓝(MB)的光降解率从56%(母体材料Cu_(1.94)S)提高到98%(Cu_(1.94)S-SnS纳米异质结),四环素(TC)的光降解速率也提高了约5倍,合成的异质结结构具有更高的光催化活性.In this study,Cu_(1.94)S-SnS nano-heterostructures were synthesized using the methods of thermal injection-cation exchange to enhance the activity of photocatalytic degradation of hazardous dyes.First,we stirred and mixed octadecene,oleylamine and copper chloride under argon atmosphere and raised the temperature to 180℃ for 15 min.The precursor of Cu_(1.94)S was cooled to 140℃,and then tert-dodecanethiol(t-DDT)was added.This solution was rapidly raised to 180℃ for 30 min,and then cooled in ice water to obtain the product of Cu_(1.94)S.Similarly,tin chloride and oleylamine were mixed under argon atmosphere and raised to 160℃ for 30 min,then cooled to 80,120 and 160℃,respectively.The Cu1.94S and tri-n-octylphosphine suspensions were injected into the precursor solution to react for 30 min.The samples were characterized using various analytical techniques,including high-resolution transmission electron microscopy(HRTEM),high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)images,STEM energy-dispersive spectroscopy(STEM-EDS),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS).At lower temperatures(80 and 120℃),sheet-like Cu_(1.94)S-SnS single-particle nano-heterojunctions were obtained with size of about 57 nm.In contrast,regular shaped heterojunctions could not be obtained at a high temperature(160℃).The Uv-visible near infrared spectrophotometer(UV-Vis-NIR)absorption spectra revealed that the synthesized Cu_(1.94)S-SnS nano-heterostructures exhibited higher light absorption in the visible range.Photocatalytic degradation of methylene blue and tetracycline was used to evaluate the photocatalytic performance of the products.The results showed that the heterostructure effectively improved the photocatalytic activity of the parent material.Specifically,the photodegradation rate of methylene blue(MB)increased from 56%(parent material Cu_(1.94)S)to 98%(Cu_(1.94)S-SnS nano-heterojunction),indicating a significant enhancement in photocatalytic activity.And the photodegra

关 键 词：硫化铜 硫化锡 纳米异质结构 亚甲基蓝 光催化 

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