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

CAO Yuan; LI Xiao-dong; PENG Chang-sheng; SUN Zong-quan; SHEN Jia-lun; MA Fu-jun; GU Qing-bao

doi:10.13205/j.hjgc.202111017

Volume 39 Issue 11

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(11): 135-142,178

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

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

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

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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

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 (k_obs) 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 k_obs 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.
- persulfate,
- iron modified biochar,
- dipping-pyrolysis,
- 2,4-dinitrotoluene

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References

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