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Volume 39 Issue 11
Jan.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(11): 135-142,178
Wang Xinsheng Huang Shaobin, . THE FEASIBILITY STUDY OF SIMULTANCEOUS REMOVAL OF NITRATE AND ATRAZINEBY SOLID-PHASE AEROBIC DENITRIFICATION[J]. ENVIRONMENTAL ENGINEERING , 2015, 33(1): 53-56. doi: 10.13205/j.hjgc.201501013
Citation: CAO Yuan, LI Xiao-dong, PENG Chang-sheng, SUN Zong-quan, SHEN Jia-lun, MA Fu-jun, GU Qing-bao. REMOVAL OF 2,4-DINITROTOLUENE BY PERSULFATE ACTIVATED WITH IRON MODIFIED BIOCHAR PREPARED BY DIPPING-PYROLYSIS PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(11): 135-142,178. doi: 10.13205/j.hjgc.202111017
shu

REMOVAL OF 2,4-DINITROTOLUENE BY PERSULFATE ACTIVATED WITH IRON MODIFIED BIOCHAR PREPARED BY DIPPING-PYROLYSIS PROCESS

doi: 10.13205/j.hjgc.202111017

  • 1. Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;

  • 2. Research Institute of Solid Waste Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;

  • 3. National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, China

  • Received Date: 2021-02-04
    Available Online: 2022-01-26
    Abstract
  • To explore and optimize the experimental conditions and influence factors of the removal of organic pollutants by persulfate activated with iron modified biochar prepared by the dipping-pyrolysis process, 2,4-dinitrotoluene (2,4-DNT) was selected as the target pollutant to investigate the effects of pyrolysis parameters (pyrolysis temperature, heating rate, and residence time), FeCl3 concentration and initial pH values on 2,4-DNT removal. The electron spin resonance and free radical quenching test were used to assess the intensity of SO4-· and ·OH in the PS/MBC system. The results showed that:1) The pyrolysis temperature had the most significant influence on removal of 2,4-DNT by PS activated with MBC, followed by heating rate and residence time. When the pyrolysis parameters were retained at 300℃, 3 h, and 10℃/min, the best removal of 2,4-DNT was obtained by PS/MBC oxidation. 2) The concentration of FeCl3 was an important factor of MBC activation. The removal of 2,4-DNT first increased and then decreased with the increase of the FeCl3 concentration. When the concentration of FeCl3 was retained at 100 mmol/L, the removal efficiency of 2,4-DNT reached 100% after the reaction of 5 h, and the pseudo-first-order kinetic constant (kobs) of 2,4-DNT removal was determined to be 1.373 min-1. 3)When the initial pH ranged from 5.0 to 9.0, 2,4-DNT had a good removal by PS/MBC oxidation, the removal efficiencies were 94.5%~83.6%, and the kobs values were 0.606~0.345 min-1. 4) ·OH was the main factor for the removal of 2,4-DNT by PS/MBC oxidation. The signals of ·OH with different strengths were observed, with the addition of MBC prepared by different pyrolysis temperatures and FeCl3 concentrations. The results showed that MBC prepared by dipping-pyrolysis could effectively activate PS to achieve the removal of organic pollutants, which provided a new idea for treatment of organically polluted water by PS based-advanced chemical oxidation.
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