Enhanced photocatalytic degradation of antibiotic drug and dye pollutants by graphene-ordered mesoporous silica (SBA 15)/TiO2 nanocomposite under visible-light irradiation
Enhanced photocatalytic degradation of antibiotic drug and dye pollutants by graphene-ordered mesoporous silica (SBA 15)/TiO2 nanocomposite under visible-light irradiation
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DOI：
10.1016/j.molliq.2020.114696
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发表时间：
2021-02-12
影响因子：
6
通讯作者：
Khan, Mohd Asim
中科院分区：
文献类型：
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作者：
Ali, Aleesha;Shoeb, Mohd;Khan, Mohd Asim
目前，研究介孔石墨烯- sba /TiO2光催化剂表面活性氧（ROS）的生成和释放是废水处理研究的一个发展趋势。在此，我们解决了TiO2纳米颗粒的缺点，并开发了介孔石墨烯- sba /TiO2纳米复合材料的光催化活性的适用性。采用SAXRD、WAXRD、FTIR、RAMAN、EDAX、HRTEM、UV-Vis、BET和XPS对不同石墨烯负载（1、3和5 wt%）下合成的石墨烯- sba /TiO2光催化剂进行了表征。以四环素类抗生素药物TC和水中溶解的亚甲基蓝染料MB为污染物，在可见光照射下测试了石墨烯- sba /TiO2纳米复合材料的光催化效果。结果显示，在可见光照射下，约98%的MB和89%的TC药物分别在30 min和60 min内被光降解。光催化降解MB和TC药物符合准一级反应动力学，表观速率常数分别为0.1189 min（-1）和0.0367 min（-1）。与SBA/TiO2纳米复合材料相比，SBA/TiO2纳米复合材料具有通过pi-pi堆叠吸附芳香族化合物的良好潜力。石墨烯的存在提高了光催化活性。石墨烯-SBA/TiO2对MB染料和TC类药物污染物具有良好的光降解效果是由于石墨烯片与SBA/TiO2的协同（界面）作用。SBA/TiO2作为可见光载流子的迁移介质，而石墨烯片由于其较大的表面积和大量的活性位点而提高了光催化性能。稳健性实验证明了石墨烯- sba /TiO2具有抗光侵蚀的潜力。石墨烯- sba /TiO2纳米复合材料被证明是一种很有前途的水净化技术。(C) 2020 Elsevier B.V.版权所有
Currently, a growing trend in wastewater treatment research focuses on the generation and release of reactive oxygen species (ROS) on the surface of mesoporous Graphene-SBA/TiO2 photocatalyst. Herein, we addressed the disadvantages of TiO2 nanoparticle and develop the applicability of the mesoporous Graphene-SBA/TiO2 nanocomposite's photocatalytic activity. Graphene-SBA/TiO2 photocatalysts synthesized with varying graphene loading (1, 3, and 5 wt%) were characterized by SAXRD, WAXRD, FTIR, RAMAN, EDAX, HRTEM, UV-Vis, BET, and XPS. The photocatalytic effectiveness of the Graphene-SBA/TiO2 nanocomposites was tested under visible light irradiation using TC (Tetracycline) antibiotic drugs and MB (Methylene blue) dye dissolved in water as the pollutant. The outcomes revealed that about 98% of MB and 89% of TC drug was photodegraded under visible light irradiation within 30 min and 60 min, respectively. The photocatalytic degradation of MB and TC drug followed a pseudo-first-order reaction kinetics with an apparent rate constant of 0.1189 min(-1) and 0.0367 min(-1), correspondingly. In comparison with the SBA/TiO2 nanocomposite, it demonstrates an excellent potential to adsorb aromatic compounds via pi-pi stacking. The improved photocatalytic activity was attributable to the presence of graphene. The mechanism has also been described: the excellent photo-degradation effect of the MB dye and the TC drug pollutants by the Graphene-SBA/TiO2 was owed to the synergetic (interfacial) effect of the graphene sheets and the SBA/TiO2. The SBA/TiO2 served as the migration media for the visible light-developed charge carriers, while the graphene sheet improved the photocatalytic due to the large surface area and the number of active sites. The robustness experiments demonstrated the Graphene-SBA/TiO2's anti-photo erosion potential. The Graphene-SBA/TiO2 nanocomposite proved to be a promising candidate as a water purification technology. (C) 2020 Elsevier B.V. All rights reserved.