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Int. J. Environ. Res. Public Health 2018, 15(9), 1937; https://doi.org/10.3390/ijerph15091937

Catalytic Degradation of Diatrizoate by Persulfate Activation with Peanut Shell Biochar-Supported Nano Zero-Valent Iron in Aqueous Solution

1
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
2
Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
3
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
4
School of Environment, Nanjing Normal University, Nanjing 210023, China
*
Authors to whom correspondence should be addressed.
Received: 6 August 2018 / Revised: 29 August 2018 / Accepted: 1 September 2018 / Published: 6 September 2018
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Abstract

An emerging pollutant, diatrizoate (DTZ) has been frequently detected in aqueous solution. Unique reticular peanut shell biochar (BC)-supported nano zero-valent iron (nZVI) composite (nZVI/BC) was successfully synthesized and used as a catalyst for activating persulfate (PS) to promote the removal of DTZ. The structure and morphology of the nanocomposite materials were characterized by scanning electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller measurements, and Fourier transform infrared spectroscopy. The degradation of DTZ (20 mg L−1) was achieved by activating PS with the nanocomposite material. The removal of DTZ reached nearly 100% using 25 mM PS and 0.45 g L−1 nZVI/2BC (mass ratio of nZVI and BC at 1:2) nanocomposite material at pH 3.0 and 25 °C. Influencing factors, such as dosages of nZVI/2BC and PS, temperature, and pH were also investigated. The mechanisms of PS activation with nZVI/2BC were discussed, including BC property, electron transfer, and the identification of free radicals in the reaction. The findings demonstrated that nZVI/BC-PS (peanut shell BC-supported nZVI activating PS) is a promising material for the treatment of refractory organic pollutants. View Full-Text
Keywords: nano zero-valent iron; peanut shell biochar; persulfate activated; diatrizoate; degradation nano zero-valent iron; peanut shell biochar; persulfate activated; diatrizoate; degradation
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Xu, J.; Zhang, X.; Sun, C.; He, H.; Dai, Y.; Yang, S.; Lin, Y.; Zhan, X.; Li, Q.; Zhou, Y. Catalytic Degradation of Diatrizoate by Persulfate Activation with Peanut Shell Biochar-Supported Nano Zero-Valent Iron in Aqueous Solution. Int. J. Environ. Res. Public Health 2018, 15, 1937.

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