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Efficient solar-light photocatalytic H2 evolution of Mn0.5Cd0.5S coupling with S,N-codoped carbon
Hao Peng,Congying Huang,Xiaogang Zheng,Jing Wen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
The low-cost and highly-efficient photocatalysts for solar-light induced water splitting had drawn greatattention to develop the renewable hydrogen economy. To enhance the solar-light driven H2 evolution ofMn0.5Cd0.5S, Mn0.5Cd0.5S was modified by S,N-codoped carbon (3-MCS/SN-C) via the in-situ sulfurizationat high temperature. In contrast with Mn0.5Cd0.5S (11.13 mmol g1 h1) and S-doped g-C3N4(0.35 mmol g1 h1), the optimal 3-MCS/SN-C with a mass ratio of Mn0.5Cd0.5S to S,N-codoped carbonof 1:3 exhibited the best H2 evolution rate of 27.58 mmol g1 h1 and an apparent quantum yield of27.43% at 400 nm. The photo-corrosion induced to the decreased H2 evolution capacity of 3-MCS/SN-Cfrom 131.13 to 126.52 mmol g1 after five cycles of 5 h. S,N-codoped carbon could efficiently capture visiblelight and absorb the photons, leading to the efficient transformation and separation of photogeneratedcarriers at the junction interface between Mn0.5Cd0.5S and S,N-codoped carbon.
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Xiaogang Zheng,Fuyan Kang,Congying Huang,Sihao Lv,JinYang Zhang,Hao Peng 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
ZnS–ZnO–Sm2O3 (Zn–Sm–XY) composites were prepared via the high-temperature calcination of coreshellstructured ZnS@Sm2O3 for the enhanced photocatalytic degradation of dyes and antibiotics invisible light region. Effects of calcined temperature, Sm2O3 content, pH value, contaminantconcentration, and inorganic ions on the photocatalytic activity were investigated. Ternary Zn–Smcomposites exhibit the excellent photocatalytic activity for the visible light driven degradation oftetracycline hydrochloride. Among these composites, Zn–Sm–2B prepared via the heat-treatment ofZnS–Sm2O3 at 673 K shows the best photocatalytic activity for the removal of tetracycline hydrochloride. The enhanced photocatalytic activity of Zn–Sm–2B is also achieved for the visible light drivendegradation of methyl orange, methylene blue, and rhodamine B within 20 min. In addition, Zn–Sm–6Ccalcined from Zn–Sm–C at 1073 K as well as Zn–Sm–2B exhibits excellent photocatalytic activity. OH andO2radicals are vital for the enhanced photocatalytic activity of Zn–Sm–2B and Zn–Sm–2B in visiblelight region, respectively. The lattice defects, sulfur vacancies, and oxygen vacancies facilitate the efficientcharge transfer and the rapid separation of electron-hole pairs at the junction interface of Zn–Sm–2B.
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