Ionic liquid-assisted bidirectional regulation strategy for carbon quantum dots (CQDs)/Bi₄O₅I₂ nanomaterials and enhanced photocatalytic properties

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• 作者：Mengxia Ji ; Jiexiang Xia ; ^{xjx@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jun Di ; Bin Wang ; Sheng Yin ; Li Xu ; Junze Zhao ; Huaming Li ; ^{lhm@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Bi4O5I2 ; Carbon quantum dots ; Photocatalytic ; Ionic liquid
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 September 2016
• 年：2016
• 卷：478
• 期：Complete
• 页码：324-333
• 全文大小：2107 K

文摘

In this study, novel visible-light-driven carbon quantum dots (CQDs)/Bi₄O₅I₂ material has been prepared via a reactable ionic liquid 1-hexyl-3-methylimidazolium iodide ([Hmim]I) assisted bidirectional regulation solvothermal method. This is the first time for the preparation of CQDs/Bi₄O₅I₂ material with halogen and CQDs bidirectional regulation at the same time. With CQDs modified on the surface of Bi₄O₅I₂, fast transfer of photogenerated charges and low recombination of photo-induced electron-hole pairs facilitated the enhancement of photodegradation activity. At the same time, the introduction of CQDs made the electrons occupied in high-energy potential on the conduction band of Bi₄O₅I₂ transfer to the reaction center CQDs and the molecular oxygen can be thus activated. The enhanced mechanisms for the active species (holes, hydroxyl and superoxide radicals) during the photocatalytic reaction under visible irradiation were analyzed using DRS analysis, electron spin resonance (ESR) technique and free radicals trapping experiments.