Adsorption-Photocatalytic Degradation of Oilfield Wastewater by C-doped Diatomite@TiO2 Catalyst
WANG Wei1, LIU Jingcheng1,2, HUO Wangchen3, WANG Jun1,2, WANG Qianhui1
1 School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China 2 The Key Laboratory of Complex Oil and Gas Field Exploration and Development of Chongqing Municipality 401331, China 3 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Abstract: Diatomite/TiO2 composites have been proven by sufficient works to have high adsorption capacity and high photocatalytic activity for organic pollutants, e.g. dyes and formaldehyde, as well as good reusability. And carbon doping can help to adjust the band structure of TiO2, and consequently, to extend the absorbing range of TiO2 to the visible light region. In this work, by using titanium tetrafluoride as precursor and appl-ying a simple hydrothermal synthesis method, diatomite@TiO2 composites were prepared, and into which, by using glucose as C source, carbon was then doped so as to prepare C-diatomite@TiO2 photocatalysts via the calcination method. The characterization of the resulted C-diatomite@TiO2 and the COD removal experiment (under visible light irradiation) for oilfield wastewater were carried out, obtaining some useful and satisfactory results. The morphology of C-diatomite@TiO2 changes very little after C doping (compared with diatomite@TiO2), as the porous structure is well retained and TiO2 particles are uniformly distributed on diatomite. UV-vis spectroscopy confirmed the significant reduction of the band gap induced by C doping. Moreover, according to the experiment of 20 min adsorption plus 75 min visible-light-photocatalyzed degradation, the COD of oilfield wastewater can be decreased by 82.59% under the presence of the photocatalyst sample with a carbon doping amount of 20% and a calcination time of 3 hours. This removal efficiency of organic compounds is much higher than that of pure diatomite@TiO2.
王薇, 刘竟成, 霍旺晨, 王均, 王芊卉. C掺杂纳米硅藻土@TiO2催化剂吸附-光催化降解油田废水[J]. 材料导报, 2020, 34(23): 23027-23032.
WANG Wei, LIU Jingcheng, HUO Wangchen, WANG Jun, WANG Qianhui. Adsorption-Photocatalytic Degradation of Oilfield Wastewater by C-doped Diatomite@TiO2 Catalyst. Materials Reports, 2020, 34(23): 23027-23032.
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2020, Vol. 34 
