Catalytic wet peroxide oxidation of benzoic acid over Fe/AC catalysts: Effect of nitrogen and sulfur co-doped activated carbon

Hangdao Qin; Rong Xiao; Jing Chen

doi:10.1016/j.scitotenv.2018.01.206

Catalytic wet peroxide oxidation of benzoic acid over Fe/AC catalysts: Effect of nitrogen and sulfur co-doped activated carbon

Sci Total Environ. 2018 Jun 1:626:1414-1420. doi: 10.1016/j.scitotenv.2018.01.206. Epub 2018 Feb 19.

Authors

Hangdao Qin¹, Rong Xiao², Jing Chen³

Affiliations

¹ School of Material and Chemical Engineering, Tongren University, Tongren 554300, China. Electronic address: qinhangdao@126.com.
² School of Pharmacy, Tongren Polytechnic College, Tongren 554300, China.
³ School of Material and Chemical Engineering, Tongren University, Tongren 554300, China.

PMID: 29898548
DOI: 10.1016/j.scitotenv.2018.01.206

Abstract

The parent activated carbon (ACP) was modified with urea and thiourea to obtain N-doped activated carbon (ACN) and N, S co-doped activated carbon (ACNS), respectively. Iron supported on activated carbon (Fe/ACP, Fe/ACN and Fe/ACNS) were prepared and worked as catalyst for catalytic wet peroxide oxidation of benzoic acid (BA). The catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM), and their performance was evaluated in terms of benzoic acid and TOC removal. The results indicated the doped N and S improved the adsorption capacity as well as catalytic activity of activated carbon. Besides, the catalytic activity toward benzoic acid degradation was found to be enhanced by Fe/ACNS compared to that of Fe/ACP and Fe/ACN. The enhanced catalytic performance was attributed to the presence of the nitrogen and sulfur atoms may serve to improve the relative amount of Fe²⁺ on iron oxide surface and also help prevent leaching of Fe. It was also observed that the stability or reutilization of Fe/ACNS catalyst was fairly good.

Keywords: Activated carbon; Benzoic acid; Catalytic wet peroxide oxidation; Nitrogen and sulfur co-doped.