Ultrasonic impregnation assisted in-situ photoreduction deposition synthesis of Ag/TiO2/rGO ternary composites with synergistic enhanced photocatalytic activity
Ultrasonic impregnation assisted in-situ photoreduction deposition synthesis of Ag/TiO2/rGO ternary composites with synergistic enhanced photocatalytic activity
复制标题
超声浸渍辅助原位光还原沉积合成协同增强光催化活性的Ag/TiO2/rGO三元复合材料
DOI：
10.1016/j.jtice.2019.08.023
复制
发表时间：
2019-11
影响因子：
5.7
通讯作者：
Bai Yingchen
中科院分区：
文献类型：
--
作者：
Hou Yaqi;Pu Shengyan;Shi Qingqing;M;al S;ip;Ma Hui;Xue Shengyang;Cai Guojun;Bai Yingchen
提高光催化材料对有机和无机污染物的降解效率已成为当务之急。我们开发了一种基于氧化石墨烯的三元复合物Ag/TiO 2/rGO作为一种绿色催化剂，并以Cr（VI）和四环素（TC）为潜在污染物，研究了该催化剂的光催化氧化还原性能。结果表明，该电子耦合体系表现出优异的光催化活性，主要是由于影响光吸收和较高的−/h+分离效率。银沉积的石墨烯负载的银和二氧化钛的光催化活性分别是Cr（VI）和TC修复的4.3和2.5倍。此外，光催化剂的使用寿命也在五次回收研究中进行了评估，表明所获得的光催化剂的效率保持在80%以上。电子顺磁共振光谱和自由基清除剂的加入证实了thate−作为还原剂，可能是降解过程的关键（O2·−）。在此基础上提出了光催化机理。本工作开发的基于石墨烯基三元复合材料的绿色催化剂可以提供更高规模的有效和经济的修复，并提供光催化技术的实际应用。
New approaches and practices to improve photocatalytic efficiency of materials for remediation of organic and inorganic pollutant has become a top priority. We have developed a graphene-oxide based ternary composite Ag/TiO2/rGO as a green catalyst, and the photocatalytic oxidation and reduction efficiency of the catalyst was thoroughly evaluated for Cr(VI) and tetracycline (TC) remediation in water as potential contaminants. The results suggested that the electronic coupleing system exhibits excellent photocatalytic activity, mainly due to affecting light absorption and highere−/h+separation efficiency. The photocatalytic activity of the silver-deposited graphene-supported silver and titanium dioxide was 4.3 and 2.5 times for Cr (VI) and TC remediation, respectively. Furthermore, the service life of the photocatalyst was also evaluated within five recycling studies, indicating that the efficiency of the obtained photocatalyst was maintained above 80%. Electron paramagnetic resonance spectroscopy and the addition of free radical scavengers confirmed thate−act as reducing agents and may be the key (O2·−) to the degradation process. The photocatalytic mechanism was proposed based on the studies obtained. Green catalysts based on graphene-based ternary composites developed in this work can provide effective and economic remediation at higher scale and offer practical application of photo catalysis technology.
登录
查看更多内容
影响因子：
15
作者：
M. Ward;James R. White;A. Bard
通讯作者：
M. Ward;James R. White;A. Bard
影响因子：
9.8
作者：
Batchu, Sudha Rani;Panditi, Venkata R.;Gardinali, Piero R.
通讯作者：
Gardinali, Piero R.
影响因子：
4.3
作者：
Wang, Xuefei;Li, Shufen;Liu, Shengwei
通讯作者：
Liu, Shengwei
影响因子：
17.1
作者：
Williams, Graeme;Seger, Brian;Kamat, Prashant V.
通讯作者：
Kamat, Prashant V.
石墨烯在增强 ZnIn2S4 光催化产氢活性方面优于碳类似物
影响因子：
22.1
作者：
Xia, Yang;Li, Qin;Li, Mei
通讯作者：
Li, Mei