石墨烯/MoS_(2)/CaIn_(2)S_(4)复合光催化剂的等离子体制备及性能研究  

Preparation and properties of graphene/MoS_(2)/CaIn_(2)S_(4) composite photocatalyst by plasma

作　　者：王宜萍[1,2] 李薇 WANG Yi-ping;LI Wei(Yichun Vocational Technical College,Yichun 336000,China;College of Chemistry,Nanchang University,Nanchang 330031,China)

机构地区：[1]宜春职业技术学院,江西宜春336000 [2]南昌大学化学学院,江西南昌330031

出　　处：《化学研究与应用》2021年第10期1972-1981,共10页Chemical Research and Application

基　　金：国家自然科学基金项目(21761021,21861026,32060577)资助;江西省自然科学基金项目(20192ACB21015)资助;江西省教学改革项目(JXJG-18-1-56)资助;南昌大学科研训练项目(3664)资助。

摘　　要：光催化技术因可以利用太阳能、反应条件温和、无二次污染等优点,有望成为解决石化行业废水、废气污染物的理想污染治理技术。为了充分发挥石墨烯、MoS_(2)等二维层状材料在结构上的优势,我们采用等离子体技术原位还原单层氧化石墨烯和四硫代钼酸铵,制备石墨烯/MoS_(2)/CaIn_(2)S_(4)复合光催化剂。利用XRD、SEM、TEM、BET、Raman、XPS等技术对复合光催化剂的结构、形貌、比表面积、电子结构等进行了表征,并研究了它们在可见光下光催化降解气相邻二甲苯和液相苯酚的性能。结果表明,在等离子体制备过程中,MoS_(2)优先负载到CaIn_(2)S_(4)表面,同时MoS_(2)和CaIn_(2)S_(4)又负载到薄层石墨烯的纳米片上。这种独特的结构不仅可以提高光催化剂的比表面积,同时还可以有效抑制光生载流子的复合、提升光生电荷的寿命,因此MoS_(2)和石墨烯的协同作用可以大幅增强CaIn_(2)S_(4)的光催化性能。当MoS_(2)和石墨烯的负载量分别达到5%和3%时,得到的石墨烯/MoS_(2)/CaIn_(2)S_(4)的光催化性能最强,90 min内可以将200 ppmV的邻二甲苯降解97.7%,表观一级反应速率常数为0.004167 min^(-1),分别是相应的石墨烯/CaIn_(2)S_(4)、MoS_(2)/CaIn_(2)S_(4)和CaIn_(2)S_(4)的2.5、5.4和7.1倍;120 min可以将20 mg·L^(-1)的苯酚降解84.8%,表观一级反应速率常数为0.01542 min-1,分别是相应的石墨烯/CaIn_(2)S_(4)、MoS_(2)/CaIn_(2)S_(4)和CaIn_(2)S_(4)的2.4、3.8和6.0倍。Photocatalysis technology is being considered as an ideal pollution treatment strategy for solving waste-water and waste-gas pollutants in petrochemical industry due to its advantages such as using solar energy,mild reaction conditions and no secondary pollution.In order to fully utilize the structural characteristics of two-dimensional-layered-materials graphene and MoS_(2),graphene/MoS_(2)/CaIn_(2)S_(4) composite photocatalysts were fabricated using the plasma technology to in-situ reduce the single-layer graphene oxide and H8MoN2S4.The obtained samples were characterized by XPS,SEM,TEM,BET,Raman and XPS,and their photocatalytic performance for the degradation of gas-phase o-xylene and liquid-phase phenol were studied under visible light irradiation.The results showed that MoS_(2) was deposited on the surface of CaIn_(2)S_(4) firstly,and then MoS_(2) and CaIn_(2)S_(4) were loaded on the nanosheets of graphene.The unique structure can not only increase the surface area,but also decrease the recombination of the photogenerated carriers and improve the lifetime of the photocharges.Therefore,the synergistic effect of MoS_(2) and graphene cocatalysts can greatly enhance the photocatalytic activity of CaIn_(2)S_(4).When the loaded content of MoS_(2) and graphene was 5%and 3%,the obtained graphene/MoS_(2)/CaIn_(2)S_(4) photocatalyst exhibited the highest activity.In 90 min,the degradation rate of o-xylene was 97.7%and the corresponding apparent rate constant was 0.004167 min-1,which is 2.5,5.4 and 7.1 times higher than that of graphene/CaIn_(2)S_(4)、MoS_(2)/CaIn_(2)S_(4) and CaIn_(2)S_(4),respectively.In 120 min,20 mg·L^(-1) phenol can be degraded by 84.8%with an apparent rate constant of 0.01542 min^(-1),which is 2.4,3.8 and 6.0 times higher than that of graphene/CaIn_(2)S_(4)、MoS_(2)/CaIn_(2)S_(4) and CaIn_(2)S_(4),respectively.

关 键 词：石墨烯/MoS_(2)/CaIn_(2)S_(4) 等离子体制备 光催化性能 降解邻二甲苯 降解苯酚 

分 类 号：O613.51[理学—无机化学]