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Int. J. Environ. Res. Public Health 2016, 13(10), 997; doi:10.3390/ijerph13100997

Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO2

1
Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
Post-Doctoral Scientific Research Workstation of Western Mining Co. Ltd., Xining 810001, China
3
Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Ganzhou 341000, China
4
School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 12 July 2016 / Revised: 19 September 2016 / Accepted: 26 September 2016 / Published: 10 October 2016
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Abstract

Rare earth element La-doped TiO2 (La/TiO2) was synthesized by the sol-gel method. Benzohydroxamic acid was used as the objective pollutant to investigate the photocatalytic activity of La/TiO2. The physicochemical properties of the prepared materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, specific surface area and porosity, scanning electron microscopy and transmission electron microscopy. As a result, the doping of La could inhibit the crystal growth of TiO2, increase its specific surface area and expand its response to visible light, thus improving its photocatalytic activity. La/TiO2 with the doping ratio of 0.75% calcined at 500 °C, showing the highest photocatalytic activity to degrade benzohydroxamic acid under the irradiation of 300 W mercury lamp. About 94.1% of benzohydroxamic acid with the original concentration at 30 mg·L−1 was removed after 120 min in a solution of pH 4.4 with an La/TiO2 amount of 0.5 g·L−1. Furthermore, 88.5% of the total organic carbon was eliminated after 120 min irradiation. In addition, after four recycling runs, La/TiO2 still kept high photocatalytic activity on the photodegradation of benzohydroxamic acid. The interfacial charge transfer processes were also hypothesized. View Full-Text
Keywords: rare earth doped; La/TiO2; characterization; benzohydroxamic acid; photocatalytic degradation; mineralization rare earth doped; La/TiO2; characterization; benzohydroxamic acid; photocatalytic degradation; mineralization
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MDPI and ACS Style

Luo, X.; Wang, J.; Wang, C.; Zhu, S.; Li, Z.; Tang, X.; Wu, M. Degradation and Mineralization of Benzohydroxamic Acid by Synthesized Mesoporous La/TiO2. Int. J. Environ. Res. Public Health 2016, 13, 997.

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