Enhanced carriers separation efficiency in g-C3N4 modified with sulfonic groups for efficient photocatalytic Cr(VI) reduction
Enhanced carriers separation efficiency in g-C3N4 modified with sulfonic groups for efficient photocatalytic Cr(VI) reduction
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DOI：
10.1016/j.materresbull.2019.110681
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发表时间：
2020-02
影响因子：
5.4
通讯作者：
Qingqiang Meng;Yuchen Cai;Bowen Cong;Weinan Xing;Gang Chen
中科院分区：
文献类型：
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作者：
Qingqiang Meng;Yuchen Cai;Bowen Cong;Weinan Xing;Gang Chen
快速的载流子传输和高的载流子分离效率是提高光催化性能的关键因素。本文采用溶液浸渍-蒸发法制备了一种磺酸基修饰的g-C3 N4光催化剂。磺酸基的强电负性为电子迁移到表面提供了引导，从而促进了光生载流子的传输和分离。除此之外，磺酸基还可以实现载体在表面上的空间分离，并作为活性位点。基于以上优点，磺酸改性g-C3 N4的可见光还原Cr（VI）活性比纯g-C3 N4提高了2.9倍。本工作为光催化剂的表面改性提供了一种新的策略，有助于构建高性能的光催化剂。
Rapid carrier transport and high carrier separation efficiency are key factors in improving photocatalytic performance. Herein, a novel sulfonic groups modified g-C3N4photocatalyst was constructed by solution impregnation and evaporation method. The strong electronegativity of the sulfonic acid group provides a guide for the migration of electrons to the surface, thereby promoting the transport and separation of photogenerated carriers. In addition to that, the sulfonic acid group can also achieve spatial separation of carriers on the surface and serve as an active site. Based on the above merits, the sulfonic-acid-modified g-C3N4exhibited a significantly enhanced visible light reduction Cr(VI) activity which is 2.9 times higher than that of pure g-C3N4.The resent work provides a new strategy for the surface modification of photocatalysts, which contributes to construct high performance photocatalysts.