| 引用本文: | 李桥,丁文川,雍毅,姜蔚,曾晓岚,高屿涛,侯江.生物质炭对气态挥发性有机污染物的吸附性能及机理[J].哈尔滨工业大学学报,2017,49(2):77.DOI:10.11918/j.issn.0367-6234.2017.02.013 |
| LI Qiao,DING Wenchuan,YONG Yi,JIANG Wei,ZENG Xiaolan,GAO Yutao,HOU Jiang.Adsorption performance and mechanism of biochars for gaseous VOCs[J].Journal of Harbin Institute of Technology,2017,49(2):77.DOI:10.11918/j.issn.0367-6234.2017.02.013 |
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| 生物质炭对气态挥发性有机污染物的吸附性能及机理 |
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李桥1,2,丁文川1Symbol`@@,雍毅3,姜蔚4,曾晓岚1,高屿涛3,侯江3
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(1.三峡库区生态环境教育部重点实验室(重庆大学),重庆400045; 2.中国电建集团成都勘测设计研究院有限公司, 成都610072;3.四川省环境保护科学研究院,成都610041;4.哈尔滨理工大学 设计研究院,哈尔滨 150080)
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| 摘要: |
| 为探究生物质炭对气态有机污染物的吸附能力及作用机理，以核桃壳和椰子壳为原料制备生物质炭.采用元素分析仪、傅里叶红外光谱仪、Boehm滴定和比表面积及孔隙率分析仪分析生物质炭理化特征，并利用吸附柱实验考察生物质炭对气态挥发性有机污染物(苯和甲苯)的吸附行为.结果表明：相同制备条件下，椰壳生物质炭吸附性能高于核桃壳生物质炭.在实验温度范围内(400~700 ℃)，随着制备温度的升高，生物质炭吸附性能增大.低温下制备的生物质炭(400 ℃)吸附行为符合准二级动力学模型，高温下制备的生物质炭(700 ℃)的吸附过程符合准一级动力学模型.在吸附温度30 ℃时，生物质炭对苯和甲苯的等温吸附过程符合Toth模型，计算得到生物质炭最大的理论饱和吸附量为18.98 mg/g苯和61.73 mg/g甲苯.生物质炭的表面酸性官能团和孔道结构在吸附过程中起关键作用，影响吸附质在生物质炭的表面吸附和粒内扩散吸附过程.
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| 关键词: 挥发性有机污染物 生物质炭 吸附 苯 甲苯 |
| DOI：10.11918/j.issn.0367-6234.2017.02.013 |
| 分类号:X701.7 |
| 文献标识码:A |
| 基金项目:国家水体污染控制与治理科技重大专项(2012ZX07102-001/004) |
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| Adsorption performance and mechanism of biochars for gaseous VOCs |
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LI Qiao1,2, DING Wenchuan1, YONG Yi3, JIANG Wei4, ZENG Xiaolan1, GAO Yutao3, HOU Jiang3
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(1.Key Laboratory of Three Gorges Reservoir Area’s Ecology and Environment(Chongqing University), Ministry of Education, Chongqing 400045,China; 2.Power China Chengdu Engineer Corporation, Chengdu 610072, China;3.Sichuan Academy of Environmental Sciences,Chengdu 610041,China;4.Design and Research Institute, Harbin University of Science and Technology, Harbin 150080,China)
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| Abstract: |
| Biochars converted from pyrolysis of walnut shell and coconut shell were used as an alternative adsorbent for adsorbing volatile organic compounds (VOCs). Biochars were characterized by Elemental analysis, Fourier transform infrared spectra, Boehm titration and specific surface area and porosity analyzer. And the adsorption behaviors of benzene and toluene on biochar were investigated by column experiments. The results suggested that the adsorption performance of coconut shell biochar was better than walnut shell biochar under the same preparation conditions. The adsorption capacity of biochar was increased with the increasing pyrolytic temperature within the temperature range (400 ℃ to 700 ℃). The adsorption process of low pyrolytic temperature biochar (400 ℃) and high pyrolytic temperature biochar (700 ℃) were described with the pseudo-second-order model and the pseudo-first-order model, respectively. At the adsorption temperature of 30 ℃, the isothermal adsorption process could be fitted by Toth model, and the maximal adsorption amounts of benzene and toluene calculated by Toth were 18.98 and 61.73 mg/g. The surface acidic groups and porous structure of biochar played an important role on adsorption capacity, affecting the surface adsorption and intraparticle diffusion process.
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| Key words: volatile organic compounds (VOCs) biochar adsorption benzene toluene |
