Photocatalytic decontamination of phenol and petrochemical wastewater through ZnO/TiO(2) decorated on reduced graphene oxide nanocomposite: influential operating factors, mechanism, and electrical energy consumption.
Photocatalytic decontamination of phenol and petrochemical wastewater through ZnO/TiO(2) decorated on reduced graphene oxide nanocomposite: influential operating factors, mechanism, and electrical energy consumption.
复制标题
DOI：
10.1039/c8ra07936f
复制
发表时间：
2018-11-28
期刊：
影响因子：
3.9
通讯作者：
Jorfi, Sahand
中科院分区：
文献类型：
--
作者：
Hayati, Farzan;Isari, Ali Akbar;Fattahi, Moslem;Anvaripour, Bagher;Jorfi, Sahand
采用水热法、溶剂热法和溶胶-凝胶法制备了ZnO/TiO2/还原氧化石墨烯（rGO）三元纳米复合异质结。利用XRD、拉曼、FESEM、EDX、Dot Mapping EDS、BET、FTIR、UV-VIS、TGA和EIS技术对合成的催化剂进行表征。XRD和拉曼光谱分析表明，样品中形成了锐钛矿相TiO2和纤锌矿相ZnO。此外，UV-Vis光谱证实ZnO/TiO2的带隙值在引入氧化石墨烯时减小。以苯酚溶液为污染物，考察了所制备催化剂的光催化性能.考察了pH值、催化剂用量、苯酚浓度、光照等因素对反应的影响，以确定最佳的净化条件。根据该结果，在可见光照射下，在pH = 4、催化剂用量为0.6g L-1、光强度为150W、苯酚初始浓度为60ppm的条件下，在160分钟时实现了苯酚的完全降解。随着氧化石墨烯添加到复合材料中，由于更高的可用表面积和更低的电子/空穴复合率，检测到光催化性能的显着增加。此外，清除实验表明，·OH参与了反应过程中苯酚的降解.并对降解机理、经济性能、矿化及可回收性进行了研究。动力学研究表明，光催化降解过程符合准一级动力学模型。一个真实的废水处理的案例被用来检查催化剂的性能，用于真实的案例研究。采用水热法、溶剂热法和溶胶-凝胶法制备了ZnO/TiO2/还原氧化石墨烯（rGO）三元纳米复合异质结。
ZnO/TiO2 anchored on a reduced graphene oxide (rGO) ternary nanocomposite heterojunction was synthesized via the multi-step method including hydrothermal, solvothermal and sol–gel methods. XRD, Raman, FESEM, EDX, Dot Mapping EDS, BET, FTIR, UV-VIS, TGA, and EIS techniques were utilized for characterizing as-synthesized catalysts. The XRD and Raman data proved the formation of anatase phase TiO2 and wurtzite phase ZnO in the prepared samples. Further, the UV-Vis spectrum confirmed that the band gap value of ZnO/TiO2 diminished on introduction of graphene oxide. Photocatalytic performance of the fabricated catalysts was investigated by decontamination of phenol in aqueous solutions. The effect of different operational factors such as pH, catalyst dosage, phenol concentration, and light illumination was investigated to find the optimum decontamination conditions. According to the results, complete degradation of phenol was achieved at pH = 4, catalyst dosage of 0.6 g L−1, light intensity of 150 W, and phenol initial concentration of 60 ppm at 160 min under visible light illumination. With the addition of graphene oxide to the composite, a significant increase was detected in the photocatalytic performance due to the higher available surface area and lower electron/hole recombination rate. In addition, the scavenging experiments revealed that the ·OH is responsible for the degradation of phenol during the reaction. The degradation mechanism, economic performance, mineralization, and recyclability were also investigated. Kinetic studies confirmed that photocatalytic degradation process followed the pseudo-first-order kinetic model. A case of real wastewater treatment was used to examine the performance of the catalyst for real case studies. ZnO/TiO2 anchored on a reduced graphene oxide (rGO) ternary nanocomposite heterojunction was synthesized via the multi-step method including hydrothermal, solvothermal and sol–gel methods.
登录
查看更多内容
影响因子：
6.7
作者：
Aslam, M.;Qamar, M. Tariq;Hameed, A.
通讯作者：
Hameed, A.
影响因子：
2.7
作者：
Jafari, Ahmad Jonidi;Kakavandi, Babak;Takdastan, Afshin
通讯作者：
Takdastan, Afshin
影响因子：
8.6
作者：
Ahmadi, Mehdi;Kakavandi, Babak;Babaei, Ali Akbar
通讯作者：
Babaei, Ali Akbar
影响因子：
4.9
作者：
Bian, Zhenfeng;Zhu, Jian;Li, Hexing
通讯作者：
Li, Hexing
影响因子：
8.7
作者：
Jorfi, Sahand;Barzegar, Gelavizh;Abtahi, Mehrnoosh
通讯作者：
Abtahi, Mehrnoosh