物理化学学报 >> 1994, Vol. 10 >> Issue (09): 790-795.doi: 10.3866/PKU.WHXB19940905

研究论文 上一篇    下一篇

酞菁钴界面修饰的CuχS·CdS复合硫化物光催化剂

吕功勋, 李树本, Savinov, E N, Parmon V N   

  1. 中国科学院兰州化学物理研究所,羰基合成与选择氧化国家重点实验室,兰州 730000|俄罗斯科学院新西伯利亚催化研究所,新西伯利亚 630090
  • 收稿日期:1993-04-06 修回日期:1993-08-10 发布日期:1994-09-15
  • 通讯作者: 吕功勋

Composite Sulfide Photocatalyst of CuχS·CdS Interface-Modified with Cobalt Phthalocyanine

Lv Gong-Xun, Li Shu-Ben, Savinov , E N, Parmon V N   

  1. State Key Laboratory of Oxo Synathesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000|Boreskov Institute of Catalysis,Russia Academy of Sciences,Novosibirsk,630090,Russia
  • Received:1993-04-06 Revised:1993-08-10 Published:1994-09-15
  • Contact: Lv Gong-Xun

摘要:

报导了酞菁钴负载到CuxS和CdS半导体界面合成的一种新型光催化剂,并对其光催化分解H2S的活性进行了考察,同时研究了酞菁钴分子与半导体相互作用及其时催化性能的影响.实验结果表明,CoPc的负载能够显著提高复合硫化物性化剂光解H2S的活性,在一定条件下,能使反应速率提高2-3倍.活性的增加与CoPc加入量呈现非线性关系,且制备过程不同,催化剂活性的变化规律也不同.先负载到CuxS表面表现出更为明显的促进作用.底物浓度与CoPc的加入量也呈现出非线性关系,在低的底物浓度下CoPc对活性有相对显著的促进作用.在CoPc的DMF溶液中加入10-5mol•L-1的Cu2+负载后的结果表明,Cu2+的加入使催化剂活性大幅度提高,这可能与Cu2+和Co2+交换后形成的CuPc使催化剂吸光波长红移有关.本文还就可能的电子转移机制进行了探讨.

关键词: 酞菁钴, 复合硫化物, 界面修饰, 微多相结, 光催化剂

Abstract:

 A new kind of modification photocatalyst has been synthesized by coating CoPc on the interface CuxS and CdS. The photocatalytic activity for hydrogen generation from H2S decomposition has been investigated in aqueous suspension. Interaction between CoPc molecule and semiconductor, as well as its influence on photocatalytic ability have also been studied. The results proved that CoPc coating could markedly enhance the photoactivity of the semiconductor for H2S decomposition with the reaction rate of 2-3 time higher. The unlinear photoactivity increase was observed at different CoPc coating concentration. Furthermore, the photoactivity was dependent on the preparation method of catalyst. CoPc dependence appears to be more pronounced if coating CoPc on CuxS surface first. Photoactivity is not proportional to the concentration of the substrate, in the lower concentration range, CoPc coating effect is more pronounced. It was shown that catalyst activity increased markedly if using CoPc DMF solution with 10-5 mol•L-1 Cu2+ion. The reason proposed is that the catalyst absorption has shifted to longer wavelength range with CuPc formed by exchanging of Cu2+ ion and Co2+ ion. The possible mechanism has been also discussed.

Key words: CoPc, Composite sulfide, Interface modification, Microheterojunction, Photocatalyst