| 何德飞 1,2，黄玉芬 2，李 翔 2，陈伟盛 2，魏 岚 2，林启美 2，刘忠珍 2，刘 鹏 1.热解温度对烟秆生物炭性状及其吸附 Cd2+ 特性的影响[J].广东农业科学,2023,50(2):76-86 |
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热解温度对烟秆生物炭性状及其吸附 Cd2+ 特性的影响 |
| Effect of Pyrolysis Temperature on the Properties of Tobacco Stem Biochar and Its Adsorption of Cd2+ |
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| DOI：10.16768/j.issn.1004-874X.2023.02.009 |
| 中文关键词: 烟秆 热解温度 生物炭 Cd2+ 吸附 应用潜力 |
| 英文关键词: tobacco stem pyrolysis temperature biochar Cd2+ adsorption application potential |
| 基金项目:广东省烟草育种与综合利用工程研究中心 / 广东省农作物遗传改良重点实验室联合开放课题（202003）；广东省农业科学院低碳农业与碳中和研究中心项目（202146）；广东省农业科学院十四五学科团队建设项目（202120TD）；国家自然科学基金（41571313） |
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| 中文摘要: |
| 【目的】我国烟草生产中产生的大量烟秆是一个亟待解决的问题，通过热解炭化技术处理制备成生物炭，并表征其理化特性，探求其吸附重金属 Cd2+ 特性，从而为烟秆资源化利用需求途径提供数据支撑。【方法】以烟秆作为制备生物炭的原料，分别以 300、400、500、600、700 ℃ 5 个温度热解，通过多种表征技术手段、室内批量吸附试验和吸附动力学试验，研究热解温度、结构特性对 Cd2+ 吸附的影响。【结果】不同温度热解烟秆生物炭的性状及对 Cd2+ 吸附特征存在明显差异，热解温度从 300 ℃提高到 700 ℃时，pH 从 9.05 增加到11.54；H、O、N 含量及 H/C、O/C 及（O+N）/C 的原子比例随热解温度的提高而降低，显现出高温热解的生物炭芳香结构更加复杂而稳定；低温烟秆生物炭的比表面积较大，但高温下表面孔隙结构更为发达。准二级动力学方程和颗粒内扩散方程能很好拟合不同温度烟秆生物炭对 Cd2+ 的吸附过程，表明吸附是异质性化学吸附；高温热解烟秆对 Cd2+ 吸附能力强，其表面丰富的孔隙结构可增强对 Cd2+ 的吸附，其中 T700 对 Cd2+ 的去除率高达99.01%；用 Langmuir-Freundlich 拟合，最大吸附量（Qm）为 54.40~106.16 mg/g，其中 700 ℃热解生物炭的 Qm 值最大，远高于稻草、小麦等农作物秸秆生物炭。【结论】不同温度热解制备的烟秆生物炭，对 Cd2+ 具有较强吸附能力，具有修复环境 Cd2+ 污染的应用潜力。 |
| 英文摘要: |
| 【Objective】A large amount of tobacco stems produced in China’s tobacco production is a problem that needs to be solved urgently. We prepared biochar by treatment with pyrolysis carbonization technology, and characterized its physicochemical properties to explore its adsorption properties of heavy metal Cd2+, with a view to providing a pathway and data support for the demand of resource utilization of tobacco stems. 【Method】Tobacco stems were used as raw materials for the preparation of biochar and pyrolyzed at five temperatures of 300 ℃, 400 ℃, 500 ℃, 600 ℃ and 700 ℃. The effects of pyrolysis temperatures and structural properties on Cd2+ adsorption were investigated by various characterization means, indoor batch adsorption tests and adsorption kinetics tests.【Result】There were significant differences in the properties and Cd2+ adsorption characteristics of tobacco stem biochar pyrolyzed at different temperatures. The pH increased from 9.05 to 11.54 when the pyrolysis temperature was increased from 300 ℃ to 700 ℃ . The H, O and N contents and the atomic ratios of H/C, O/C and (O+N)/C also decreased with the increase of pyrolysis temperature, showing that the aromatic structure of hightemperature pyrolyzed biochar was more complex and stable; the specific surface area of low-temperature tobacco stem biochar was relatively large, however, the surface pore structure was more developed at high temperature. The quasi-second kinetic equation and intra-particle diffusion equation could well fit the adsorption process of Cd2+ by different temperatures of the straw biochar, indicating that the adsorption is heterogeneous chemisorption; the high temperature pyrolysis of stems had a strong adsorption capacity for Cd2+, and the rich pore structure of its surface enhances the adsorption of Cd2+, therefore, the removal rate of Cd2+ by T700 was as high as 99.01%; with Langmuir- Freundlich fitting, the maximum adsorption amounts (Qm) ranged from 54.40 to 106.16 mg/g, with the largest Qm values for 700 ℃ biochar, which were also much higher than those for rice straw, wheat and other crop straw biochar.【Conclusion】The biochar of tobacco stem prepared at different pyrolysis temperatures has a strong adsorption capacity for Cd2+ and has the potential to be applied for remediation of environmental Cd2+ pollution in the
environment. |
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