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Two‐step calcination synthesis of Z‐scheme α‐Fe2O3/few‐layer g‐C3N4 composite with enhanced hydrogen production and photodegradation under visible light
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-06-17 , DOI: 10.1002/jccs.202000127 Minshuai Hou 1, 2 , Lifeng Cui 2 , Fengyun Su 3 , Xinfa Dong 1 , Haifeng Dang 2
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-06-17 , DOI: 10.1002/jccs.202000127 Minshuai Hou 1, 2 , Lifeng Cui 2 , Fengyun Su 3 , Xinfa Dong 1 , Haifeng Dang 2
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Solar photocatalytic technology is of great significance for adjusting energy structure and environmental improvement. Developing an efficient and low‐cost photocatalyst is key to realizing the conversion of solar to chemical energy. In this study, α‐Fe2O3‐modified few‐layer g‐C3N4 hybrids (α‐Fe2O3/FL g‐C3N4) were successfully prepared by a two‐step calcination route with a mixture of α‐Fe2O3 and melamine. The samples were characterized by Thermogravimetric analysis, X‐ray diffraction, Fourier transform infrared, scanning electron microscope, transmission electron microscope, High‐resolution transmission electron microscopy, X‐ray photoelectron spectroscopy, Brunauer–Emmett–Teller, UV–Vis absorption spectrum, photoluminescence, and Time‐resolved photoluminescence spectroscopy; furthermore, their photoelectrochemical measurements and their photocatalytic performances were evaluated by visible light‐driven hydrogen evolution and degradation of RhB. The results showed that the hydrogen production activity and degradation ability of α‐Fe2O3/FL g‐C3N4 were significantly enhanced compared with those of α‐Fe2O3/multilayer g‐C3N4 (α‐Fe2O3/ML g‐C3N4) and FL g‐C3N4. The enhanced photoactivities were mainly attributed to the synergistic effect between the increased visible‐light absorption, enhanced surface area, and highly efficient electron transfer and separation on the Z‐type heterojunction interface. This work not only provides evidence for the formation of FL g‐C3N4 nanosheets using a thermal exfoliation method but also provides new insights into the interfacial charge carrier dynamics of Z‐scheme α‐Fe2O3/FL g‐C3N4 heterostructures for photocatalytic H2 generation and pollutant degradation.
中文翻译：
Z方案α-Fe2O3/少量g-C3N4复合材料的两步煅烧合成，并在可见光下增强了氢的产生和光降解
太阳能光催化技术对调整能源结构和改善环境具有重要意义。开发高效，低成本的光催化剂是实现太阳能向化学能转化的关键。在这项研究中，的α-Fe 2 ö 3修饰的少层G-C 3 Ñ 4杂种（的α-Fe 2 ö 3 / FL G-C 3 Ñ 4）被成功地通过用两步煅烧路线制备α‐Fe 2 O 3的混合物和三聚氰胺。通过热重分析，X射线衍射，傅立叶变换红外，扫描电子显微镜，透射电子显微镜，高分辨率透射电子显微镜，X射线光电子能谱，Brunauer–Emmett–Teller，UV–Vis吸收光谱对样品进行了表征光致发光和时间分辨光致发光光谱；此外，通过可见光驱动的氢气释放和RhB的降解，评估了它们的光电化学性能和光催化性能。结果表明，的产氢活性和退化的能力的α-Fe 2 ö 3 / FL G-C 3 Ñ 4与那些相比均显著增强的α-Fe 2O 3 /多层g‐C 3 N 4（α‐Fe 2 O 3 / ML g‐C 3 N 4）和FL g‐C 3 N 4。增强的光活性主要归因于可见光吸收增加，表面积增加以及Z型异质结界面上高效的电子转移和分离之间的协同效应。这项工作不仅提供证据的FL形成G-C 3个Ñ 4使用热剥离方法纳米片，但也提供了新的见解Z-方案的界面的载流子动力学的α-Fe 2 ö 3/ FL g‐C 3 N 4异质结构，用于光催化H 2的产生和污染物的降解。
更新日期：2020-06-17
中文翻译：
Z方案α-Fe2O3/少量g-C3N4复合材料的两步煅烧合成，并在可见光下增强了氢的产生和光降解
太阳能光催化技术对调整能源结构和改善环境具有重要意义。开发高效，低成本的光催化剂是实现太阳能向化学能转化的关键。在这项研究中，的α-Fe 2 ö 3修饰的少层G-C 3 Ñ 4杂种（的α-Fe 2 ö 3 / FL G-C 3 Ñ 4）被成功地通过用两步煅烧路线制备α‐Fe 2 O 3的混合物和三聚氰胺。通过热重分析，X射线衍射，傅立叶变换红外，扫描电子显微镜，透射电子显微镜，高分辨率透射电子显微镜，X射线光电子能谱，Brunauer–Emmett–Teller，UV–Vis吸收光谱对样品进行了表征光致发光和时间分辨光致发光光谱；此外，通过可见光驱动的氢气释放和RhB的降解，评估了它们的光电化学性能和光催化性能。结果表明，的产氢活性和退化的能力的α-Fe 2 ö 3 / FL G-C 3 Ñ 4与那些相比均显著增强的α-Fe 2O 3 /多层g‐C 3 N 4（α‐Fe 2 O 3 / ML g‐C 3 N 4）和FL g‐C 3 N 4。增强的光活性主要归因于可见光吸收增加，表面积增加以及Z型异质结界面上高效的电子转移和分离之间的协同效应。这项工作不仅提供证据的FL形成G-C 3个Ñ 4使用热剥离方法纳米片，但也提供了新的见解Z-方案的界面的载流子动力学的α-Fe 2 ö 3/ FL g‐C 3 N 4异质结构，用于光催化H 2的产生和污染物的降解。
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