不同原料烘焙炭的理化特性及对亚甲基蓝的吸附性能

doi:10.11896/cldb.17120234

材料导报

2019, Vol. 33

Issue (8): 1276-1284 https://doi.org/10.11896/cldb.17120234

无机非金属及其复合材料

不同原料烘焙炭的理化特性及对亚甲基蓝的吸附性能

郑云武, 陶磊, 康佳, 黄元波, 刘灿, 郑志锋

西南林业大学材料科学与工程学院,云南省高校生物质化学炼制与合成重点实验室,昆明 650224

Physicochemical Properties of Torrefied Biochar from Different Biomass Feedstock and Its Adsorption Performance for Methylene Blue

ZHENG Yunwu, TAO Lei, KANG Jia, HUANG Yuanbo, LIU Can, ZHENG Zhifeng

Key Laboratory for Biomass Chemical Refinery & Synthesis, Yunnan Province, College of Materials Science and Engineering, Southwest Forestry University, Kunming 650224

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摘要选择四种生物质为原料,经300 ℃热裂解制成生物质烘焙炭,研究生物烘焙炭理化特性对亚甲基蓝的吸附特性以及动力学、热力学特性,分析了pH值、吸附时间、溶液初始质量浓度、生物质投加量对吸附效果的影响。同时对吸附动力学以及吸附机制进行研究。结果表明:生物质烘焙炭对亚甲基蓝的吸附约60 min即达平衡;适宜pH值为8~12,平衡吸附量随着初始浓度的增加而增加。四种生物质烘焙炭对亚甲基蓝的等温吸附均可用Langmuir方程和Frcundlich方程拟合,木粉烘焙炭属于单分子层吸附,而壳类生物质烘焙炭以多分子层吸附为主,吸附过程符合准二级动力学方程,即以化学吸附为主,吸附过程由膜扩散和颗粒内扩散共同控制,颗粒内扩散为主要吸附速率控制步骤,吸附过程为吸热反应,高温有利于吸附体系的自发进行。最终得到四种原料烘焙炭吸附能力的强弱顺序为:核桃壳烘焙炭＞木粉烘焙炭＞椰子壳烘焙炭＞橡胶籽壳烘焙炭。

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	郑云武
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	郑志锋

关键词: 烘焙炭理化性能吸附性能亚甲基蓝动力学

Abstract: Torrefied biochrs were produced from the pyrolysis of rubber seed shell, walnut, wood power as well as coconut shell respectively, at 300 ℃. The adsorbents of methylene blue (MB) aqueous solution by four biochars were investigated. The effect of MB of pH, contract time, initial solution concention and adsorbent dosage on the adsorption properties was also estimated. The kinetic data were analysised by the pseudo-first, second-order kinetic and intraparticle diffusion, and the equilibrium data were analyzed using the Langmuir and the Freundlich isotherms models. The results showed that:adsorption equilibrium was reached within 60 min at 298.15 K under the proper pH value between 8.0—12, and the adsorption capacity increasing with the rise of initial MB concentration. While, it was found that the adsorption kinetic followed the second-order mo-del. This suggested that the adsorption of MB by pyrocarbon was a chemisorptions process, and the intraparticle diffusion was not the primary rate-determining step. Besides, Langmuir and the Freundlich isotherms models were all fitting the equilibrium data. The thermodynamics properties showed that adsorption of four biomass was endothermic and spontaneous with the rise of the temperature, the adsorption degree of four biomass pyrocarbon were as followed:walnut shell＞wood power＞coconut shell＞rubber seed shell

Key words: torrefied carbon physicochemical properities adsorption performance methylene blue kinetic

出版日期: 2019-04-25 发布日期: 2019-04-28

ZTFLH:

TB33

基金资助: 云南省科技厅面上项目(2018FB071);云南省教育厅教师类项目(2018JS325);国家自然科学基金(31670599)

作者简介: 郑云武,西南林业大学副教授,2014年9月至2017年6月,在东北林业大学获得生物工程专业工学博士学位,毕业后任教西南林业大学,email: zhengzhifeng666@163.com。郑志锋,厦门大学闽江学者特聘教授,西南林业大学教授,博士研究生导师,教育部新世纪优秀人才

引用本文:

郑云武, 陶磊, 康佳, 黄元波, 刘灿, 郑志锋. 不同原料烘焙炭的理化特性及对亚甲基蓝的吸附性能[J]. 材料导报, 2019, 33(8): 1276-1284.
ZHENG Yunwu, TAO Lei, KANG Jia, HUANG Yuanbo, LIU Can, ZHENG Zhifeng. Physicochemical Properties of Torrefied Biochar from Different Biomass Feedstock and Its Adsorption Performance for Methylene Blue. Materials Reports, 2019, 33(8): 1276-1284.

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http://www.mater-rep.com/CN/10.11896/cldb.17120234 或 http://www.mater-rep.com/CN/Y2019/V33/I8/1276

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