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Enhanced photocatalytic hydrogen evolution along with byproducts suppressing over Z-scheme CdxZn1-xS/Au/g-C3N4 photocatalysts under visible light 被引量:12
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作者 He Zhao Xiaoling Ding +2 位作者 Bing Zhang Yingxuan Li Chuanyi Wang 《Science Bulletin》 SCIE EI CAS CSCD 2017年第9期602-609,共8页
Inspired by natural photosynthesis, a new series of Z-scheme Cd_xZn_(1-x)S/Au/g-C_3N_4 photocatalysts were synthesized via depositing Au particles on g-C_3N_4, followed by anchoring CdxZn_(1-x)S solid solution on the ... Inspired by natural photosynthesis, a new series of Z-scheme Cd_xZn_(1-x)S/Au/g-C_3N_4 photocatalysts were synthesized via depositing Au particles on g-C_3N_4, followed by anchoring CdxZn_(1-x)S solid solution on the pre-formed Au/g-C_3N_4 for photocatalytic hydrogen evolution. Their structure, morphology and optical property were investigated in detail. Photocatalytic activities of the developed photocatalysts for water splitting were evaluated under visible-light irradiation(k > 420 nm) using glucose as electron donor.The highest hydrogen evolution rate of 123 lmol g^(-1)h^(-1)is achieved by Cd_(0.8Z)n_(0.2)S/Au/g-C_3N_4, which is 52.2 and 8.63 times higher than that of Au/g-C_3N_4 and Cd S/Au/g-C_3N_4, respectively. The results of photoluminescence spectra, photoelectrochemical and time-resolved photoluminescence spectra indicate that the improved photocatalytic activities for Cd_xZn_(1-x)S/Au/g-C_3N_4 are due to the efficient separation of photogenerated carriers. In addition, it is noteworthy that the undesired byproducts CO and CO_2 are greatly reduced by introducing CdxZn_(1-x)S over Au/g-C_3N_4 surface. In the photocatalytic process, gluconic acid originated from the reaction of photogenerated hydroxyl radical with glucose plays a vital role on suppressing the formation of the gas byproducts. The present work will provide a new strategy to design Z-scheme photocatalysts with enhanced efficiency for water splitting along with suppressing the byproducts. 展开更多
关键词 Hydrogen evolution cdxzn1-xs/au/g-c3n4 BYPRODUCTS Z-scheme Visible light
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高效光催化活性g-C3N4/ZnxCd1-xS复合材料的性能分析 被引量:1
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作者 田研 谭玉 +2 位作者 张泽华 童彦敏 亓淑艳 《哈尔滨理工大学学报》 CAS 北大核心 2020年第4期134-140,共7页
采用原位生长技术,利用共沉淀-水热法制备g-C3N4/ZnxCd1-xS光催化剂。通过XRD、SEM、TEM、EDS、UV-Vis DRS等手段对光催化剂的结构组成和光化学性质进行测试和表征。通过亚甲基蓝(MB)在可见光照射下的降解评价g-C3N4/ZnxCd1-xS的光催化... 采用原位生长技术,利用共沉淀-水热法制备g-C3N4/ZnxCd1-xS光催化剂。通过XRD、SEM、TEM、EDS、UV-Vis DRS等手段对光催化剂的结构组成和光化学性质进行测试和表征。通过亚甲基蓝(MB)在可见光照射下的降解评价g-C3N4/ZnxCd1-xS的光催化活性;并通过捕获剂测试研究光催化降解机制。结果表明:g-C3N4与ZnxCd1-xS形成了结晶良好的异质结结构,g-C3N4的加入增大了复合材料的光吸收范围,且随着x值的增大,材料光吸收范围逐渐减小。其中g-C3N4/Zn0.5Cd0.5S光催化性能最佳,可见光照射210 min后,MB的降解率达到了99%。且经过4次重复性试验后,光催化活性没有出现明显降低;通过捕获剂实验发现,参与降解的主要活性物质为h+和O-2·。 展开更多
关键词 光催化 g-c3n4 ZnxCd1-xs 异质结 亚甲基蓝
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