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Efficient Photocatalytic H2O2 Production Ability of a Novel Graphitic Carbon Nitride/Carbon Composites under Visible Light
Small ( IF 13.0 ) Pub Date : 2023-07-28 , DOI: 10.1002/smll.202303813 Huagen Liang 1, 2 , Anhu Wang 1, 2 , Ruolin Cheng 1 , Xinlong Tian 3 , Shengyu Jing 4, 5 , Panagiotis Tsiakaras 5
Small ( IF 13.0 ) Pub Date : 2023-07-28 , DOI: 10.1002/smll.202303813 Huagen Liang 1, 2 , Anhu Wang 1, 2 , Ruolin Cheng 1 , Xinlong Tian 3 , Shengyu Jing 4, 5 , Panagiotis Tsiakaras 5
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In the present work, using one-step calcination of a mixture made of potassium hydroxide (KOH), melamine, and microplastics, this work prepares a novel graphitic carbon nitride/carbon (g-C3N4/C) composite, which can be employed to photo-catalytically produce hydrogen peroxide (H2O2) at a high rate up to 6.146 mmol g−1 h−1 under visible light irradiation. By analyzing the energy band structure of the catalyst, the production of H2O2 in this system consists of two single-electron reactions. The modification of KOH makes abundant N-vacancies caused by cyano-groups in g-C3N4, enhancing the electron absorption ability. Moreover, the introduction of graphitic carbon increases its specific surface area and porosity and improves the adsorption ability of O2. Simultaneously, their synergism reduces the g-C3N4 band gap, making both the conduction-band and valence-band positions more negative, showing enhanced reduction ability, lowering the energy barrier for oxygen reduction, and greatly improving the photogeneration performance of H2O2.
中文翻译：
新型石墨碳氮化物/碳复合材料在可见光下高效光催化 H2O2 生产能力
在本工作中，利用氢氧化钾（KOH）、三聚氰胺和微塑料制成的混合物的一步煅烧，制备了一种新型石墨氮化碳/碳（gC 3 N 4 /C）复合材料，可用于在可见光照射下以高达6.146 mmol g -1 h -1的光催化速率产生过氧化氢（H 2 O 2 ） 。通过分析催化剂的能带结构，该体系中H 2 O 2的生成由两个单电子反应组成。KOH的修饰使gC 3 N 4中氰基产生丰富的N空位，增强了电子吸收能力。而且石墨碳的引入增加了其比表面积和孔隙率，提高了对O 2的吸附能力。同时，它们的协同作用降低了gC 3 N 4带隙，使导带和价带位置都更负，表现出增强的还原能力，降低了氧还原的能垒，大大提高了H 2 O的光生性能2 .
更新日期：2023-07-28
中文翻译：
新型石墨碳氮化物/碳复合材料在可见光下高效光催化 H2O2 生产能力
在本工作中，利用氢氧化钾（KOH）、三聚氰胺和微塑料制成的混合物的一步煅烧，制备了一种新型石墨氮化碳/碳（gC 3 N 4 /C）复合材料，可用于在可见光照射下以高达6.146 mmol g -1 h -1的光催化速率产生过氧化氢（H 2 O 2 ） 。通过分析催化剂的能带结构，该体系中H 2 O 2的生成由两个单电子反应组成。KOH的修饰使gC 3 N 4中氰基产生丰富的N空位，增强了电子吸收能力。而且石墨碳的引入增加了其比表面积和孔隙率，提高了对O 2的吸附能力。同时，它们的协同作用降低了gC 3 N 4带隙，使导带和价带位置都更负，表现出增强的还原能力，降低了氧还原的能垒，大大提高了H 2 O的光生性能2 .
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