Novel visible-light-driven CdIn2S4/mesoporous g-C3N4 hybrids for efficient photocatalytic reduction of CO2 to methanol
Novel visible-light-driven CdIn2S4/mesoporous g-C3N4 hybrids for efficient photocatalytic reduction of CO2 to methanol
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DOI：
10.1016/j.molcata.2016.12.006
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发表时间：
2017-04
影响因子：
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通讯作者：
Hong Liu;Zhe Zhang;Jingchai Meng;Jiang Zhang
中科院分区：
文献类型：
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作者：
Hong Liu;Zhe Zhang;Jingchai Meng;Jiang Zhang
利用半导体光催化剂将CO2光催化转化为碳氢燃料，被认为是解决能源短缺和温室效应的有效途径。本文采用硬模板结合水热法成功制备了有序介孔g-C3 N4（mpg-C3 N4）纳米片负载CdIn 2S 4纳米复合材料。在可见光照射下，该杂化材料对CO2还原为CH 3OH具有高效的光催化活性。优化后的CdIn 2S 4/mpg-C3 N4光催化剂在mpg-C3 N4含量为20wt%时表现出较高的甲醇生成速率，为42.7 μmol g−1h− 1。该速率比纯CdIn 2S 4高1.8倍。CdIn 2S 4/mpg-C3 N4异质结的光催化活性显著增强主要归因于CO2吸附量的增加和光生电子-空穴对在紧密界面处的分离和转移。此外，杂化光催化剂在可见光下显示出优异的稳定性。提出了CdIn 2S 4/mpg-C3 N4复合材料光催化还原CO2的可能机理。该研究为今后多功能复合光催化剂的设计和实际应用提供了参考。
Photocatalytic conversion of CO2into hydrocarbon fuels using semiconductor photocatalysts has attracted great attention, which is considered as a promising approach to resolve the energy shortage and greenhouse effect. In this work, ordered mesoporous g-C3N4(mpg-C3N4) nanosheets supported CdIn2S4nanocomposites were successfully fabricated by a hard-template combinated with hydrothermal method. The hybrids showed highly efficient photocatalytic activities for the reduction of CO2to CH3OH under visible-light irradiation. The optimized CdIn2S4/mpg-C3N4photocatalyst exhibited a high CH3OH-production rate of 42.7 μmol g−1h−1at a mpg-C3N4content of 20 wt%. This rate was 1.8 times higher than that of pure CdIn2S4. The significant enhancement of photocatalystic activity was mainly ascribed to the increased CO2adsorption capacity and the improved separation and transfer of photogenerated electron-hole pairs at the intimate interface of CdIn2S4/mpg-C3N4heterojunctions. Furthermore, the hybrid photocatalysts displayed excellent stability under visible-light. A possible mechanism of enhanced photocatalytic activity of CdIn2S4/mpg-C3N4composite on photocatalytic reduction of CO2was also proposed. This work may provide some useful information for the future design and practical application of multifunctional hybrid photocatalysts in photocatalytic reduction of CO2.