| 吸附VOCs活性炭真空热再生及影响因素实验 |
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| 引用本文： | 党小庆,敬开锐,马红周,董浩云,曹利,李育,刘霞,李世杰. 吸附VOCs活性炭真空热再生及影响因素实验[J]. 环境工程, 2022, 40(8): 62. DOI: 10.13205/j.hjgc.202208008 |
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| 作者姓名： | 党小庆 敬开锐 马红周 董浩云 曹利 李育 刘霞 李世杰 |
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| 作者单位： | 西安建筑科技大学环境与市政工程学院陕西省环境工程重点实验室,西安710055;西安建筑科技大学冶金工程学院陕西省黄金与资源重点实验室,西安710055 |
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| 基金项目： | 国家重点研发计划(2017YFC0212204)陕西省重点研发计划(2018ZDCXL-SF-02-04) |
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| 摘 要： | 活性炭的再生及循环利用对降低吸附法治理含VOCs废气的成本、减少危废产生量具有重要意义。采用真空热再生法对吸附乙酸乙酯的活性炭进行了再生实验,考察不同再生温度及保温时间对活性炭再生效果的影响及真空热再生法对活性炭的循环再生性能。结果表明:活性炭的损失率随再生温度升高而增大,并且当再生温度<200 ℃时,活性炭损失率最大仅0.7%;在最佳实验条件(200 ℃并保温30 min)下,乙酸乙酯脱附率达到93.8%,再生后活性炭的平衡吸附量为108.1 mg/g。比表面积及孔径分布显示,200 ℃以下的真空热再生对活性炭结构几乎无影响;300,400,500 ℃下真空热再生后活性炭的比表面积较新活性炭分别增加22,19,42 m2/g。在最佳再生条件下循环再生6次后,活性炭对乙酸乙酯的平衡吸附量达到新活性炭的97%,表明真空热再生法对活性炭具有良好的再生性能。
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| 关 键 词： | 活性炭 真空热再生 比表面积 循环再生 |
| 收稿时间： | 2021-12-28 |
EXPERIMENTAL RESEARCH ON VACUUM-THERMAL REGENERATION OF ACTIVATED CARBON FOR ADSORPTION OF VOCs AND THE INFLUENCING FACTORS |
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| Affiliation: | 1. Shaanxi Key Laboratory of Environmental Engineering, Environmental and Municipal Engineering Department, Xi'an University of Architecture and Technology, Xi'an 710055, China;2. Shaanxi Key Laboratory of Gold and Resources, Metallurgical Engineering Department, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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| Abstract: | The regeneration and recycling of activated carbon are important to reduce the cost of VOCs treatment by adsorption method and to reduce the amount of hazardous waste generated. The activated carbon adsorbed ethyl acetate was regenerated by vacuum-thermal regeneration method, the effect of regeneration temperature and holding time on the regeneration effect of activated carbon, and the recycling performance of activated carbon by vacuum-thermal regeneration method were investigated. The results showed that the loss rate of activated carbon increased with the increase of regeneration temperature, and the maximum loss rate of activated carbon was only 0.7%, when the regeneration temperature was less than 200 ℃; the desorption rate of ethyl acetate reached 93.8% and the equilibrium adsorption capacity of activated carbon after regeneration was 108.1 mg/g at the optimal experimental condition of 200 ℃ and holding time of 30 min. The specific surface area and pore size distribution showed that vacuum-thermal regeneration had almost no effect on the structure of activated carbon when the temperature was lower than 200 ℃; the specific surface area of activated carbon increased by 22, 19, 42 m2/g after regeneration at 300, 400, 500 ℃, respectively, compared with that of the new activated carbon. After six cycles of regeneration under optimal regeneration conditions, the equilibrium adsorption capacity of activated carbon for ethyl acetate reached 97% of that of the new activated carbon, indicating that vacuum-thermal regeneration method had good regeneration performance for activated carbon. |
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