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林产化学与工业 ›› 2014, Vol. 34 ›› Issue (4): 9-15.doi: 10.3969/j.issn.0253-2417.2014.04.002

• 研究报告 • 上一篇    下一篇

杉木树皮吸附重金属离子性能和动力学研究

苏文鹏1, 杨益琴1, 蒋玲玉1, 周浩1, 周永红2   

  1. 1. 南京林业大学 江苏省制浆造纸科学与技术重点实验室, 江苏 南京 210037;
    2. 中国林业科学研究院 林产化学工业研究所, 江苏 南京 210042
  • 收稿日期:2013-09-03 出版日期:2014-08-25 发布日期:2015-08-18
  • 作者简介:苏文鹏(1988-),男,江苏泰州人,博士生,从事植物资源化学与利用研究
  • 基金资助:
    “十二五”国家科技支撑计划资助项目(2012BAD32B05)

Adsorption Performance of Heavy Metal Ions by Fir Bark and Its Kinetic

SU Wen-peng1, YANG Yi-qin1, JIANG Ling-yu1, ZHOU Hao1, ZHOU Yong-hong2   

  1. 1. Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China;
    2. Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, China
  • Received:2013-09-03 Online:2014-08-25 Published:2015-08-18
  • Contact: 杨益琴,副教授,硕士生导师,研究领域为植物资源化学与利用;E-mail:wsfyyq@163.com。 E-mail:wsfyyq@163.com

摘要: 通过间歇吸附的方法研究了杉木树皮粉对水溶液中Cu2+、Cd2+和Pb2+重金属离子的吸附性能,研究了树皮粉粒径大小、重金属离子水溶液的pH值、吸附时间和溶液的初始浓度对杉木树皮吸附重金属离子吸附量的影响,并对吸附过程的等温吸附方程和吸附动力学模型进行了模拟拟合。结果表明:杉木树皮粉可以有效地吸附水溶液中的重金属离子,树皮粒径大小以250~830 μm为宜,吸附适宜的水溶液pH值为5,吸附时间为 30 min,此时 0.6 g 树皮粉对 100 mL 初始质量浓度为 150 mg/L 的重金属离子溶液Cu2+、Cd2+和Pb2+的吸附量分别为6.83、13.56和 23.17 mg/g。45℃ 下等温吸附过程符合Freundlich和Langmuir等温吸附模型,但Langmuir等温吸附模型拟合相关性更高;吸附动力学符合Lagergren准二级动力学模型,拟合相关性R2大于0.997。说明杉木树皮粉可作为水溶液中重金属离子的有效吸附剂,其吸附主要为单分子层的化学吸附。

关键词: 杉木树皮, 吸附, 重金属离子, 吸附动力学, 等温吸附模型

Abstract: The adsorption of copper, lead and cadmium ions (heavy metal ions, HMI) from aqueous solution by the powder of fir bark was investigated by using batch techniques.The effects of pH value, contact time and initial metal ions concentration and particle size of fir bark powder on the metal ions adsorption capacity have been studied. Fir bark was found to be a low cost and promising adsorbent for absorbing heavy metal ions from aqueous solution. The results showed that the suitable size of bark powder used as adsorbent is 250-830 μm. Under the condition with pH of 5.0 and a contact time of 30 min, 0.6 g bark powder in 100 mL initial ions concentration of 150 mg/L resulted in the maximum adsorption capacity of 6.83, 13.56 and 23.17 mg/g for Cu2+, Cd2+ and Pb2+, respectively. Kinetics fitted with Lagergren pseudo second-order models. Hence adsorption kinetic parameters were calculated, and the correlation coefficient R2>0.997 was obtained. The adsorption data of metal ions at 45℃ has been described by the Freundlich and Langmuir isothermal absorption models, and Langmuir isothermal adsorption model was more satisfied. Ion exchange was probably one of the major adsorption mechanisms for binding divalent metal ions to the bark powder. From these results, it can be concluded that the powder of the fir bark could be a good adsorbent for extracting the metal ions from aqueous solution.

Key words: fir bark, adsorption, heavy metal ions, adsorption kinetic, isothermal adsorption model

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