Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (11): 2503-2510.doi: 10.7503/cjcu20200342

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Nitrogen-doped Carbon Nanotubes and the Performance and Mechanism of PMS Activation

YAN Song, ZHANG Chengwu, YUAN Fang, QIN Chuanyu()   

  1. School of New Energy and Environment,Key Laboratory of Groundwater Resources and Environment,Ministry of Education,National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology,Jilin University,Changchun 130012,China
  • Received:2020-06-10 Online:2020-11-10 Published:2020-11-06
  • Contact: QIN Chuanyu E-mail:qincyu@jlu.edu.cn
  • Supported by:
    Supported by the National Key R&D Program of China(2018YFC1802503)

Abstract:

Using multi-wall carbon nanotubes(MWCNT) as raw materials and melamine as a nitrogen precursor, a nitrogen-doped carbon nanotube(N-CNT-700) with a nitrogen content of about 3.33%(molar fraction) was prepared by high-temperature calcination. N-CNT-700 is a one-dimensional tubular nanomaterial, the de-gradation efficiency of phenol can reach 100%, and the total organic carbon(TOC) removal rate can reach 61.6%, and the activation energy of the system is 35.4 kJ/mol within 60 min in N-CNT-700 activated PMS system. Through electron paramagnetic resonance(EPR) detection, quenching experiment and PMS concentration determination, the degradation mechanism of the system was determined to be free radicals(·OH, SO4·-) and non-free radicals, in addition to 9% adsorption removal, in the 91% oxidative degradation, free radicals account for about 49%, 1O2 for about 18%, and active intermediates for about 24%. The reactivity of N-CNT-700 decreases as the number of reuses increases, and high temperature treatment can restore its high reactivity. The calcination temperature affects the nitrogen content and types of the material. The reactivity of N-CNT is proportional to the nitrogen content and is closely related to the nitrogen content of graphite.

Key words: Carbon nanotubes, Nitrogen doping, Peroxymonosulfate, Phenol, Reactivity

CLC Number: