浸渍热解法制备铁改性生物炭活化过硫酸盐去除2,4-二硝基甲苯

曹媛; 李晓东; 彭昌盛; 孙宗全; 沈佳伦; 马福俊; 谷庆宝

doi:10.13205/j.hjgc.202111017

浸渍热解法制备铁改性生物炭活化过硫酸盐去除2,4-二硝基甲苯

doi: 10.13205/j.hjgc.202111017

1. 中国海洋大学环境科学与工程学院, 山东青岛 266100;
2. 中国环境科学研究院固体废物污染控制技术研究所, 北京 100012;
3. 污染场地安全修复技术国家工程实验室, 北京 100015

基金项目:

污染场地安全修复技术国家工程实验室开放基金项目（NEL-SRT201706）；国家重点研发计划项目"东北重工业区场地复合污染综合治理技术与集成工程示范"（2019YFC3800）。

详细信息

作者简介:
曹媛(1995-),女,硕士,主要研究方向为水污染治理及农业废物资源化利用。17853480012@163.com

通讯作者:
沈佳伦(1996-),男,工程师,主要研究方向为土壤和地下水修复。1069024560@qq.com

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出版历程
- 收稿日期: 2021-02-04
- 网络出版日期: 2022-01-26

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

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

摘要

摘要: 为探究并优化浸渍热解法制备铁改性生物炭（MBC）活化过硫酸盐（PS）对有机污染物去除的试验条件及影响因素，以2，4-二硝基甲苯（2，4-DNT）为目标污染物，考察了热解参数（热解温度、升温速率和停留时间）、FeCl₃浸渍浓度及初始pH值对2，4-DNT去除的影响，并采用电子自旋共振波谱技术及自由基猝灭试验鉴定了PS/MBC体系中生成的自由基。结果表明：1）热解温度对MBC活化PS去除2，4-DNT的影响最显著，其次为升温速率和停留时间；当热解温度、停留时间和升温速率分别为300℃、3 h和10℃/min时，热解制备的MBC对活化PS去除2，4-DNT的效果最佳；2）FeCl₃浸渍浓度是影响MBC活化性能的重要因素，随着FeCl₃浸渍浓度的升高，2，4-DNT的去除率先增后减，当FeCl₃的浸渍浓度为100 mmol/L时，5 h内2，4-DNT的去除率可达到100%，2，4-DNT去除的准一级动力学常数（k_obs）为1.373 min^-1；3）当初始pH值为5.0~9.0时，2，4-DNT均具有较好的去除效果，其去除率为94.5%~83.6%，k_obs为0.606~0.345 min^-1；4）PS/MBC体系中生成的·OH是2，4-DNT去除的主要原因，其强度随MBC的热解温度和FeCl₃浸渍浓度的不同差异较大。研究结果表明，浸渍热解法制备的MBC可有效活化PS实现污染物的高效去除，为PS化学氧化处理有机污染水体提供了新思路。
- 过硫酸盐 /
- 铁改性生物炭 /
- 浸渍热解法 /
- 2,4-二硝基甲苯
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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