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Reaction Kinetics, Mechanisms and Catalysis

, Volume 126, Issue 1, pp 547–560 | Cite as

Catalytic wet oxidation of high concentration formaldehyde wastewater over Pt/nitrogen-doped activated carbon

  • Bo XingEmail author
  • Guo Yang
  • Honglin Chen
  • Xingyong Liu
Article
  • 38 Downloads

Abstract

High concentration formaldehyde (HCHO) wastewater was treated by catalytic wet oxidation (CWO) using Pt/activated carbons. The activated carbons (ACs) with different surface nitrogen content were prepared by H2O2 pre-oxidation and thermal treatment with melamine. The corresponding Pt/ACs were prepared by excess volume impregnation process and characterized by N2 adsorption/desorption, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The CWO experiments were performed in a co-current upflow fixed bed reactor at 125 °C and 1.0 MPa. The results revealed the positive effect of nitrogen-containing surface groups on the Pt–AC interactions, and resulting in a smaller Pt nanoparticles size and a narrower distribution. Compared with the original Pt/AC, more nitrogen content of Pt/AC showed higher catalytic activity in the mineralization of high concentration formaldehyde (~ 17,000 mg/L) and COD (~ 23,000 mg/L). After 170 h of time on stream, HCHO and COD concentrations of effluent from Pt/AC increased from 482 to 805 mg/L, and from 1895 to 2980 mg/L, respectively, while those from Pt/nitrogen-doped AC just increased from 0.6 to 30.6 mg/L, and from 48 to 345 mg/L even at 350 h of time on stream. Lesser Pt leaching and the extent of agglomeration of Pt NPs were observed over nitrogen-containing Pt/AC. CWO using Pt/nitrogen-doped AC may be applied as a promising treatment for high concentration HCHO wastewater prior to biological system.

Keywords

Formaldehyde Catalytic wet oxidation Platinum Nitrogen-containing surface groups 

Notes

Acknowledgements

This work was funded by the Sichuan Province Science and Technology Support Program (2015GZ0169), Talents introduction program of Sichuan University of Science and Engineering (2015RC51) and Talents introduction program of Sichuan University of Science and Engineering (2018RC01).

Supplementary material

11144_2018_1480_MOESM1_ESM.pdf (1000 kb)
Supplementary material 1 (PDF 999 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.College of Chemical EngineeringSichuan University of Science and EngineeringZigongPeople’s Republic of China
  2. 2.Chengdu Institute of Organic ChemistryChinese Academy of SciencesChengduPeople’s Republic of China

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