Graphene aerogel for photocatalysis-assist uranium elimination under visible light and air atmosphere
Graphene aerogel for photocatalysis-assist uranium elimination under visible light and air atmosphere
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光催化石墨烯气凝胶——可见光和空气气氛下辅助除铀
DOI：
10.1016/j.cej.2020.126256
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发表时间：
2020-12
影响因子：
15.1
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Wang Zhe;Liu Hangxi;Lei Zhen;Huang Liqin;Wu Tong;Liu Shuang;Ye Gaoyang;Lu Yuexiang;Wang Xiangke
光催化辅助铀从可溶性离子到不溶性纳米粒子的转变有利于铀的提取，但在空气气氛下很少实现。在这里，我们开发了一种新型的石墨烯气凝胶（GA），GA-200，用于在可见光和空气气氛下从水中光催化去除铀。通过控制还原度，GA-200保留了锚定铀的官能团数量，并具有高的光电流响应和窄的带隙，易于产生和转移电子/空穴。在可见光照射下，中性（UO 2）O2·2 H2O纳米粒子可从GA-200表面抽空，原位再生活性中心，去除能力可达1050 mg/g。并对其机理进行了进一步的研究。结果表明，在空气中存在O2时，铀酰自身的光化学性质对生成H2 O2起着重要作用，生成的是（UO 2）O2·2 H2O而不是UO 2，这与无氧气氛下的结果不同。
Photocatalysis-assist transition of uranium from soluble ions to insoluble nanoparticles is benefit for the extraction of uranium but has been rarely realized under air atmosphere. Here we developed a novel graphene aerogel (GA), GA-200, for the photocatalytic removal of uranium from water under visible light and air atmosphere for the first time. By controlling the reduction degree, GA-200 remained numbers of functional groups for anchoring uranium and possessed high photocurrent response and narrow band gap to generate and transfer electrons/holes readily. Under visible light irradiation, neutral (UO2)O2·2H2O nanoparticles were formed and could evacuate from the surface of GA-200 to regenerate the active sites in-situ, resulting in a high removal capacity of 1050 mg/g. The mechanism was further studied. It was found that at the presence of O2in air, the photochemistry property of uranyl itself played an essential role to generate H2O2and (UO2)O2·2H2O was formed instead of UO2, which was different from that in oxygen-free atmosphere.
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影响因子：
15.1
作者：
Vanesa N. Salomone;J. Meichtry;M. Litter
通讯作者：
Vanesa N. Salomone;J. Meichtry;M. Litter
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影响因子：
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作者：
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DOI：
10.1016/j.apcatb.2019.02.008
发表时间：
2019-07
期刊：
Applied Catalysis B: Environmental
影响因子：
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作者：
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影响因子：
22.1
作者：
Jiang, Xun-Heng;Xing, Qiu-Ju;Wang, Xiang-Ke
通讯作者：
Wang, Xiang-Ke
DOI：
10.1016/j.apcatb.2018.02.062
发表时间：
2018-09
期刊：
Applied Catalysis B: Environmental
影响因子：
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作者：
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通讯作者：
Xiaona Liu;Penghui Du;Weiyi Pan;Chenyuan Dang;Tianwei Qian;Hong-fang Liu;Wen Liu;Dongye Zhao