Citation: Yunqing Liu, Peiyu Xia, Lingyu Li, Xinyue Wang, Jiaqi Meng, Yuxin Yang, Yihang Guo. In-situ route for the graphitized carbon/TiO₂ composite photocatalysts with enhanced removal efficiency to emerging phenolic pollutants[J]. Chinese Journal of Catalysis, ;2020, 41(9): 1378-1392. doi: 10.1016/S1872-2067(20)63565-3 shu

In-situ route for the graphitized carbon/TiO₂ composite photocatalysts with enhanced removal efficiency to emerging phenolic pollutants

School of Environment, Northeast Normal University, Changchun 130117, Jilin, China

Received Date: 17 January 2020
Revised Date: 23 February 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21573038 and 51608102).

TiO₂ is the most photoactive material because of its superstrong photooxidizing ability, and TiO₂ photocatalysis has been widely applied in sustainable water treatment and environmental remediation. However, poor sunlight or visible-light harvesting efficiency and fast recombination rate of the photogenerated charge carriers severely limit the practical applications of TiO₂. To overcome these problems, the present work demonstrates a facile in-situ co-condensation method combined with hydrothermal treatment to prepare a series of graphitized carbon/TiO₂ composite photocatalysts, and anatase TiO₂ phase and p-p-conjugated polycyclic aromatic carbon structure are created simultaneously. As-prepared TiO₂/C composites exhibit remarkably high visible-light photocatalytic activity in the degradation of aqueous emerging phenolic pollutants, acetaminophen (APAP) and methylparaben (MPB), and apparent rate constant of the TiO₂/C composite with carbon doping level of 10.3% for APAP and MPB removal is 7.6 and 2.8 times higher than that of bare TiO₂, and 6.2 and 2.6 times higher than that of Degussa P25 TiO₂. Based on the results of photoelectrochemical experiments, indirect chemical probe measurements, and ESR spectroscopy, it is verified that doping TiO₂ with graphitized carbon is responsible for this enhanced photocatalytic activity, which renders the improved visible-light harvesting ability, the accelerated separation of the photogenerated charge carriers, and enlarged BET surface areas. Through analyzing the intermediates yielded in the photodegradation process, the pathway of visible-light photocatalytic degradation of APAP and MPB over the TiO₂/C composite is proposed.
- Titanium dioxide,
- Carbon,
- Visible-light photocatalysis,
- Composite,
- Phenolic compound,
- Water treatment
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沈阳化工大学材料科学与工程学院沈阳 110142

In-situ route for the graphitized carbon/TiO2 composite photocatalysts with enhanced removal efficiency to emerging phenolic pollutants

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通讯作者: 陈斌, bchen63@163.com

In-situ route for the graphitized carbon/TiO₂ composite photocatalysts with enhanced removal efficiency to emerging phenolic pollutants