Photo-catalytic reduction of carbon dioxide with in-situ synthesized CoPc/TiO2 under visible light irradiation
Photo-catalytic reduction of carbon dioxide with in-situ synthesized CoPc/TiO2 under visible light irradiation
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DOI：
10.1016/j.jclepro.2009.02.016
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发表时间：
2009-07-01
影响因子：
11.1
通讯作者：
Wang, Zhizhong
中科院分区：
文献类型：
--
作者：
Zhao, Zhihuan;Fan, Jimin;Wang, Zhizhong
在可见光照射下，CO2在水溶液中光催化还原生成甲酸、甲醇、甲醛，并原位合成CoPc/TiO 2。以Co（II）为模板剂，通过1，2-二氰基苯在TiO 2表面的环化反应，原位合成CoPc/TiO 2纳米复合材料。采用XRD、DTA-TG、UV-vis和FT-IR等手段对催化剂进行了表征。讨论了这些催化剂在可见光下的光催化活性。实验结果表明，钴酞菁（CoPc）和二氧化钛确实是通过原位法合成。在可见光照射下，CoPc分子首先被激发，激发的电子被注入到TiO 2的导带中，电子-空穴对的分离增加，从而提高了光催化效率。结果表明，原位合成的CoPc/TiO 2比物理吸附的CoPc/TiO 2具有更好的吸附性能。0.7wt%原位CoPc/TiO_2的总有机碳（TOC）产率为1714 9 μ mol/g催化剂。产率远高于TiO_2和物理吸附CoPc/TiO_2。(C)2009爱思唯尔有限公司保留所有权利。
CO2 is photo-catalytically reduced to produce formic acid, methanol, formaldehyde in an aqueous solution using visible light irradiation and in-situ synthesized CoPc/TiO2, CoPc/TiO2 nano-composite is in-situ synthesized through the annulations of 1,2-dicyanobenzene on the surface of TiO2 with Co(II) as template. The prepared catalysts are characterized by means of XRD, DTA-TG, UV-vis and FT-IR methods. The photo-catalytic activity of these catalysts under visible light is discussed. The experimental results indicate that cobalt-phthalocyanine (CoPc) and TiO2 are indeed synthesized by the in-situ method. Under the visible light irradiation, CoPc molecules are excited first and the excited electrons are injected into the conduction band of TiO2, then the separation of electron-hole pairs is increased so that the photocatalytic efficiency is increased. The results show that the in-situ CoPc/TiO2 out performed physical absorbed CoPc/TiO2. The total organic carbon (TOC) yield of 0.7 wt% in-situ CoPc/TiO2 is 1714 9 mu mol/g catal. following 10 h of visible light illumination. The yield is much higher than those of TiO2 and physical absorbed CoPc/TiO2. (C) 2009 Elsevier Ltd. All rights reserved.