聚苯乙烯/氮化钼/硫化镉光催化剂的制备及其产氢性能研究  

Preparation and Hydrogen Production Performance of Polystyrene/Molybdenum Nitride/Cadmium Sulphide Photocatalyst

作　　者：李文杰 LI Wen-jie(Faculty of Resources and Environmental Science Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学资源环境学院,湖北武汉430062

出　　处：《塑料科技》2021年第9期51-55,共5页Plastics Science and Technology

摘　　要：针对硫化镉(CdS)在水介质中光催化效率较低的问题,设计合成氮化钼(MoN)助催化剂。采用聚合法制备聚苯乙烯(PS)材料,将氮化钼/硫化镉(MoN/CdS)负载至PS表面,制备PS/MoN/CdS复合材料。通过XRD、TEM、BET和紫外可见漫反射光谱表征催化剂的理化性质,并分析催化机理。结果表明:PS/MoN/CdS复合材料的比表面积随着MoN负载量的增加,呈现先增加后减小的趋势,PS/MoN(2.5%)/CdS的SBET值达到最大为35.229 m^(2)/g。PS/MoN(2.5%)/CdS的用量为0.15 g、pH值为5时,光催化产氢速率最高为542μmol/h,循环5次实验均达到470μmol/h以上,具有良好的稳定性。MoN与PS的界面接触较好,利于光催化反应中光载流子的传递,提高PS/MoN/CdS复合材料光催化产氢的效率。PS/MoN/CdS可以显著增加CdS的可见光吸收,且不改变CdS的固有能带结构,提供更多的反应活性位点,提高复合材料的电子和空穴的分离,增强光催化反应活性。In view of the low photocatalytic efficiency of cadmium sulfide(CdS)in water,a molybdenum nitride(MoN)cocatalyst was designed and synthesized.Polystyrene(PS)material was prepared by polymerization method.MoN/CdS was loaded on the surface of PS to prepare PS/MoN/CdS composites.The physical and chemical properties of the catalysts were characterized by XRD,TEM,BET and UV-Vis diffuse reflectance spectroscopy.The results show that the specific surface area of PS/MoN/CdS composites increase first and then decrease with the increase of MoN loading.The maximum SBETvalue of PS/MoN(2.5%)/CdS is 35.229 m^(2)/g.When the dosage of PS/MoN(2.5%)/CdS is 0.15 g and the pH value is 5,the highest photocatalytic hydrogen production rate is 542μmol/h,and the five cycles experiments are all above 470μmol/h,showing good stability.The interfacial contact between MoN and PS is good,which is beneficial to the transfer of photocarriers in photocatalytic reaction and improves the photocatalytic hydrogen production efficiency of PS/MoN/CdS composites.PS/MoN/CdS can significantly increase the visible light absorption of CdS without changing the intrinsic energy band structure of CdS,providing more reactive sites,improving the separation of electrons and holes in the composite,and enhancing the photocatalytic activity.

关 键 词：氮化钼 聚苯乙烯 光催化 产氢 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]