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One-Step Synthesis of Honeycomb-Like Carbon Nitride Isotype Heterojunction as Low-Cost, High-Performance Photocatalyst for Removal of NO
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1021/acssuschemeng.8b02536 Xuewen Li 1 , Dongyun Chen 1 , Najun Li 1 , Qingfeng Xu 1 , Hua Li 1 , Jinghui He 1 , Jianmei Lu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1021/acssuschemeng.8b02536 Xuewen Li 1 , Dongyun Chen 1 , Najun Li 1 , Qingfeng Xu 1 , Hua Li 1 , Jinghui He 1 , Jianmei Lu 1
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Carbon nitride (CN) is a metal-free conjugated semiconductor photocatalyst, but it is limited by its low activity mainly because of a high rate of charge carrier recombination. Here, we synthesized a honeycomb-like CN isotype heterojunction photocatalyst, made of a single substrate, by thermal treatment of thiourea and urea mixing with ultrapure water. This new photocatalyst can remove a low concentration of NO (600 ppb) effectively, and its maximum efficiency is 68% under visible-light irradiation. This catalytic efficiency is much better than the previously reported literature. We attributed the high performance to the formation of a heterojunction and efficient charge separation and transfer. Their interfaces of the honeycomb-like CN isotype heterojunction are not mutually exclusive because of almost no difference in their chemical composition. Furthermore, the honeycomb structure likely increased the absorption of light energy and improved the photocatalytic properties owing to multiple reflections within the porous structure. Finally, a Z-scheme photocatalytic mechanism is put forward and explained based on electron spin resonance experiments and calculations of the energy bands.
中文翻译：
一步法合成蜂窝状氮化碳同型异质结作为低成本，高性能的脱氮光催化剂
氮化碳（CN）是一种无金属的共轭半导体光催化剂，但由于其低活性而受到限制，这主要是因为电荷载流子的复合率很高。在这里，我们通过对硫脲和尿素与超纯水混合进行热处理，合成了由单一基质制成的蜂窝状CN同型异质结光催化剂。这种新型光催化剂可有效去除低浓度的NO（600 ppb），在可见光照射下的最大效率为68％。该催化效率比以前报道的文献好得多。我们将高性能归因于异质结的形成以及有效的电荷分离和转移。蜂窝状CN同种异质结的界面不互斥，因为它们的化学组成几乎没有差异。此外，由于多孔结构内的多次反射，蜂窝结构可能增加了光能的吸收并改善了光催化性能。最后，基于电子自旋共振实验和能带的计算，提出并解释了Z-方案的光催化机理。
更新日期：2018-07-03
中文翻译：
一步法合成蜂窝状氮化碳同型异质结作为低成本，高性能的脱氮光催化剂
氮化碳（CN）是一种无金属的共轭半导体光催化剂，但由于其低活性而受到限制，这主要是因为电荷载流子的复合率很高。在这里，我们通过对硫脲和尿素与超纯水混合进行热处理，合成了由单一基质制成的蜂窝状CN同型异质结光催化剂。这种新型光催化剂可有效去除低浓度的NO（600 ppb），在可见光照射下的最大效率为68％。该催化效率比以前报道的文献好得多。我们将高性能归因于异质结的形成以及有效的电荷分离和转移。蜂窝状CN同种异质结的界面不互斥，因为它们的化学组成几乎没有差异。此外，由于多孔结构内的多次反射，蜂窝结构可能增加了光能的吸收并改善了光催化性能。最后，基于电子自旋共振实验和能带的计算，提出并解释了Z-方案的光催化机理。
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