花生壳与花生壳生物炭对镉离子吸附性能研究

程启明; 黄青; 刘英杰; 廖祯妮

文章摘要

程启明,黄青,刘英杰,廖祯妮.花生壳与花生壳生物炭对镉离子吸附性能研究[J].农业环境科学学报,2014,33(10):2022-2029.

花生壳与花生壳生物炭对镉离子吸附性能研究

Adsorption of Cadmium（Ⅱ） on Peanut Shell and Its Biochar

投稿时间：2014-05-09

DOI：10.11654/jaes.2014.10.020

中文关键词: 花生壳花生壳生物炭镉傅里叶红外等温吸附模型生物质基材料

英文关键词: peanut shells(PS) peanut shell derived biochar(PSB) cadmium(Ⅱ) Fourier Transform infrared spectroscopy(FTIR) isotherm models biomass-based material

基金项目:国家科技支撑计划项目（2014BAD14B04）；中国科学院重点部署项目（No.KZZD-EW-16-02）

作者	单位	E-mail
程启明	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021 广西大学农学院, 南宁 530004
黄青	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021	qhuang@iue.ac.cn
刘英杰	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021 同济大学环境科学与工程学院, 上海 200092
廖祯妮	中国科学院城市环境研究所城市环境与健康重点实验室, 福建厦门 361021

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中文摘要:

将花生壳（PS）改性制备成花生壳生物炭（PSB），研究了吸附时间（10~5760 min）、吸附剂用量（0.1~5 g）、镉离子溶液初始pH值（1~8）和浓度（10~800 mg·L^-1）等因素对Cd²⁺去除效率的影响；利用场发射扫描电镜（SEM）、傅里叶红外光谱（FTIR）与模型拟合分析，探讨了PS和PSB的吸附性能与机理。实验结果表明，PS和PSB是优良的生物质基吸附材料；pH为5.0、Cd²⁺溶液浓度为10 mg·L^-1、吸附剂添加量为4 mg·mL^-1时，PS的去除效率为93.33%，PSB的去除效率为99.51%；吸附容量分别可达26.88 mg·g^-1、28.99 mg·g^-1；Freundlich与Langmuir吸附模型均能较好地描述PS和PSB对Cd²⁺的等温吸附过程，以Freundlich 模型略优。SEM电镜扫描和FTIR图谱分析表明PS和PSB对镉的吸附主要为多分子层的表层络合吸附：SEM分析表明PS和PSB在吸附Cd²⁺以后表面具有大量的颗粒附着物；FTIR分析表明PS与PSB吸附镉的主要机理为络合反应，PS参与络合反应的主要官能团为-CHO、-C=O、-OH和-P=O，PSB参与络合反应的主要官能团为-C=C-、-C≡C- 、-C≡N和-OH等官能团。

英文摘要:

Peanut shell is waste from agriculture and industry. This study was conducted to investigate the potential of peanut shell(PS) and its biochar(PSB) to remove cadmium(Cd²⁺) from aqueous solution under different conditions including pH, initial Cd²⁺ concentrations, adsorbent doses and time. The surface characteristics and mechanism of Cd adsorption were also investigated using scanning electron microscope, Fourier transform infrared spectroscopy(FTIR), BET specific surface area analyses and model simulation. Both PS and PSB were excellent adsorbents for Cd²⁺. At pH 5, 10 mg·L^-1 of Cd²⁺ concentration and 4 mg· mL^-1 of adsorbent, Cd²⁺ removal efficiencies were 93.33% and 99.51% for PS and PSB, respectively. The maximum adsorption for Cd²⁺ was respectively 26.88 mg·g -1 and 28.99 mg·g^-1 for PS and PSB. Freundlich and Langmuir models could be used to describe the adsorption data, with the former better than the latter. The adsorption was mainly polymolecular layer adsorption and the complexation was one of the adsorption mechanisms. The main functional groups involved in the complexation were -CHO,-C=O,-OH and-P=O for PS;while-C=C-,-C≡C-,-C≡N and -OH for PSB. The SEM and FTIR analyses showed that a lot of particles or ash substances were deposited on the surface of PS and PSB after adsorption of Cd²⁺.

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