Edge-Functionalized g-C3N4 Nanosheets as a Highly Efficient Metal-free Photocatalyst for Safe Drinking Water
Edge-Functionalized g-C3N4 Nanosheets as a Highly Efficient Metal-free Photocatalyst for Safe Drinking Water
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DOI：
10.1016/j.chempr.2018.12.009
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发表时间：
2019-03-14
期刊：
影响因子：
23.5
通讯作者：
Wang, Guoxiu
中科院分区：
文献类型：
--
作者：
Teng, Zhenyuan;Yang, Nailiang;Wang, Guoxiu
无金属光催化剂催化的太阳能水消毒是一种很有前途的清洁水生产方法。采用边缘功能化石墨氮化碳（g-C3N4）作为光催化消毒剂，我们发现富菌水在可见光照射下30 min内可快速净化，消毒效率达99.9999%以上，满足饮用水要求。边缘功能化的g-C3N4显示出比先前报道的最佳无金属光催化剂高5倍的一级消毒率，但仅消耗催化剂的1/10。催化活性也可与最好的金属基光催化剂相媲美。最高已占据分子轨道和Mulliken电荷分布结果表明，暴露在g-C3N4纳米片边缘的-COOH和C=O基团不仅显著促进电荷分离，而且诱导表面能带向上弯曲，有利于过氧化氢的生成。
Solar water disinfection catalyzed by metal-free photocatalyst has emerged as a promising approach for clean water production. By using the edge-functionalized graphitic carbon nitride (g-C3N4) as photocatalytic disinfectants, we find that the pathogen-rich water can be rapidly purified in 30 min with a disinfection efficiency of over 99.9999% under visible-light irradiation, which meets the requirement for drinking water. The edge-functionalized g-C3N4 shows a first-order disinfection rate that is five times higher than the previously reported best metal-free photocatalyst but only consumes 1/10 of the catalyst. The catalytic activity is also comparable to that of the best metal-based photocatalyst. Results of the highest occupied molecular orbitals and Mulliken charge distribution reveal that the exposed -COOH and C=O groups at the edges of g-C3N4 nanosheets not only significantly promote charge separation but also induce the upward bending of the surface band, facilitating the generation of hydrogen peroxide.