C掺杂纳米硅藻土@TiO<sub>2</sub>催化剂吸附-光催化降解油田废水

doi:10.11896/cldb.19120094

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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.

Key words： carbon doping nano-diatomite@TiO₂ adsorption visible-light photocatalysis oilfield wastewater chemical oxygen demand (COD) band gap adjusting

Published: 24 December 2020

CLC number:

O649.4

Fund:This work was financially supported by the State Administration of Work Safety 2016 Key Technology and Technology Project for the Prevention of Major Work Safety Accidents (chongqing-0006-2016AQ), Graduate Science and Technology Innovation Program Project of Chongqing University of Science and Technology (YKJCX1820109).

About author:: Wei Wang received her B.S. degree in 2018. She is currently pursuing her M.S. at the School of Petroleum Engineering, Chongqing University of Science and Technology under the supervision of Prof. Jingcheng Liu. Her research has focused on preparation of nanomaterials and photocatalytic treatment of oil and gas wastewater.
Jingcheng Liu completed his B. E. and M. E. in Southwest Petroleum University in 2004 and 2008, respectively. He received his Ph.D. degree in safety technology and engineering from the Chongqing University in 2008. His research interest involves the field of oil and gas field development engineering.

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	WANG Wei
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Cite this article:

WANG Wei,LIU Jingcheng,HUO Wangchen, et al. Adsorption-Photocatalytic Degradation of Oilfield Wastewater by C-doped Diatomite@TiO₂ Catalyst[J]. Materials Reports, 2020, 34(23): 23027-23032.

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http://www.mater-rep.com/EN/10.11896/cldb.19120094 OR http://www.mater-rep.com/EN/Y2020/V34/I23/23027

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