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Ag/Ag_(3)PO_(4)/NGQDs复合光催化剂的制备及其可见光催化性能研究
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作者 唐新德 王津津 +3 位作者 伍素云 刘水林 刘宁 龚升高 《环境科学学报》 CAS CSCD 北大核心 2024年第5期69-80,共12页
Ag_(3)PO_(4)的高载流子复合率和严重的光腐蚀极大地限制了其光催化应用.在此,通过简单的水热法制备了一系列银/磷酸银/氮掺杂石墨烯量子点(Ag/Ag_(3)PO_(4)/NGQDs)复合光催化剂,发现Ag和NGQDs可以大大提高Ag_(3)PO_(4)的光催化活性和... Ag_(3)PO_(4)的高载流子复合率和严重的光腐蚀极大地限制了其光催化应用.在此,通过简单的水热法制备了一系列银/磷酸银/氮掺杂石墨烯量子点(Ag/Ag_(3)PO_(4)/NGQDs)复合光催化剂,发现Ag和NGQDs可以大大提高Ag_(3)PO_(4)的光催化活性和稳定性,这归因于NGQDs接收电子和Ag的局域表面等离子体共振的协同效应.因此,Ag/Ag_(3)PO_(4)/NGQDs对甲基橙(MO)的降解表现出优异的光催化活性和稳定性.特别是,Ag/Ag_(3)PO_(4)/0.5%NGQDs对MO的降解速率常数分别是Ag_(3)PO_(4)和Ag_(3)PO_(4)/0.5%NGQDs的约2.5倍和1.6倍,且其对MO的光催化降解率在5次循环后仍保持在91.2%,而Ag_(3)PO_(4)/0.5%NGQDs和Ag_(3)PO_(4)分别仅保持在66.8%和31.3%.Ag/Ag_(3)PO_(4)/0.5%NGQDs复合光催化剂可见光降解MO过程中的主要活性物质是超氧自由基(·O_(2)^(-))和光生空穴(h^(+)).此外,Ag/Ag_(3)PO_(4)/0.5%NGQDs对罗丹明B、亚甲基蓝、苯酚和盐酸四环素等也表现出优异的光催化活性,这种高活性高稳定性Ag_(3)PO_(4)基复合光催化剂将可实际应用于废水处理. 展开更多
关键词 Ag_(3)PO_(4) AG NGQD 光催化活性 稳定性
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Enhanced Visible-light Photocatalytic Activity of g-C3N4/Nitrogen-doped Graphene Quantum Dots/TiO2 Ternary Heterojunctions for Ciprofloxacin Degradation with Narrow Band Gap and High Charge Carrier Mobility 被引量:2
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作者 CHEN Ting ZHONG Lei +5 位作者 YANG Zhen MOU Zhigang LIU Lei WANG Yan SUN Jianhua LEI Weiwei 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2020年第6期1083-1090,共8页
Limited visible-light absorption and high recombination rate of photogenerated charges are two main drawbacks in g-C3Na-based photocatalysts.To solve these problems,g-CN4/nitrogen-doped graphene quantum dots(NGQDs)/Ti... Limited visible-light absorption and high recombination rate of photogenerated charges are two main drawbacks in g-C3Na-based photocatalysts.To solve these problems,g-CN4/nitrogen-doped graphene quantum dots(NGQDs)/TiO2 ternary heterojunctions were facilely prepared via a one-step calcining method.The morphology.structure,optical and electrochemical properties of g-C3NA/NGQDs/TiO2 were characterized and explored.The optimal g-CN4/NGODs/TiOz composite exhibits enhanced photocatalytic degradation performance of ciprofloxacin(CIP)compared with the as-prepared g-C3Na.TiO:(P25)and g-C3N4/TiO2 heterojunction under visible light irradia-tion.The apparent rate constant of the composite is around 6.43.4.03 and 2.30 times higher than those of g-C3N4,TiOz and g-C3N4/TiO2,respectively.The enhanced photocatalytic efficiency should be mainly attributed to the improvement of light absorption and charge separation and transfer efficiency,originating from the narrow band gap and high charge carrier mobility.The active species trapping experiments results showed that the ht and'02 were the main active species in the degradation process.A possible photocatalytic reaction mechanism of the g-C3N4/NGODs/TiO2 composite for the enhanced degradation of CIP under visible light irradiation was also proposed. 展开更多
关键词 g-C3N4/ngqds/TiO2 Heterojunction Photocatalysis Antibiotic ciprofloxacin
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