Highly Efficient Metal-Free Visible Light Driven Photocatalyst: Graphene Oxide/Polythiophene Composite
Highly Efficient Metal-Free Visible Light Driven Photocatalyst: Graphene Oxide/Polythiophene Composite
复制标题
高效无金属可见光驱动光催化剂：氧化石墨烯/聚噻吩复合材料
DOI：
10.1002/slct.201700974
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发表时间：
2017
期刊：
影响因子：
2.1
通讯作者：
Hong Xinlin
中科院分区：
文献类型：
--
作者：
Yu Yue;Yang Qiqi;Yu Xi;Lu Qingye;Hong Xinlin
通过在氧化石墨烯（GO）表面原位聚合噻吩（Th）单体，制备了氧化石墨烯/聚噻吩（GO/PTh）复合材料。通过调节GO/Th比和石墨烯氧化程度，实现了GO/PTh复合材料在可见光下对亚甲基蓝（MB）的光降解的显著性能。在可见光照射下，该复合材料在30 min内即可实现100%的MB降解，其催化活性（0.1149min-1）分别是PTh（0.0003 min-1）和GO（0.0028 min-1）的382倍和41倍。 MB吸附实验、紫外-可见（维斯）和光致发光（PL）光谱的结果表明，GO和PTh的结合增加了MB的吸附，降低了带隙，增强了光电子转移。具有36%PTh的复合材料（在进料的GO/Th重量比为1：2时）显示出最高的催化活性，其中复合材料中GO的MB吸附能力和PTh的光电子产生能力很好地匹配。通过控制GO制备过程中石墨/KMnO 4的比例和后反应时间来改变石墨烯的氧化程度，可以进一步提高催化剂的活性。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，GO氧化程度的增加导致GO与PTh之间的π-π相互作用更强，PTh更富电子，从而导致更高的催化活性。
Graphene oxide/polythiophene (GO/PTh) composites were synthesized by in‐situ polymerization of thiophene (Th) monomers on GO surfaces. Remarkable performance of GO/PTh composites for methylene blue (MB) photo‐degradation under visible light has been achieved by tuning GO/Th ratio and graphene oxidation degrees. 100 % MB degradation was achieved by the composite within 30 min under visible light, its catalytic activity (0.1149 min−1) is 382 and 41 times higher than that of PTh (0.0003 min−1) and GO (0.0028 min−1), respectively. The results of MB adsorption experiment, ultraviolet‐visible (UV‐vis) and photoluminescence (PL) spectra show that combination of GO and PTh increases MB adsorption, decreases the band gap and enhances photo‐electron transfer. The composite with 36 % PTh (at the fed GO/Th weight ratio of 1:2) shows the highest catalytic activity where MB adsorption ability by GO and photo‐electron producing ability by PTh in the composite is well matched. The catalytic activity can be further enhanced by changing graphene oxidation degree by controlling graphite/KMnO4ratio and post‐reaction time during GO preparation. Fourier transform infrared (FTIR) spectroscopy and X‐ray photo‐electron (XPS) spectroscopy analyses have shown that increasing oxidation degree of GO leads to a stronger π‐π interaction between GO and PTh and a more electron‐rich PTh, resulting in higher catalytic activity.