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生物质化学工程

生物质化学工程 ›› 2019, Vol. 53 ›› Issue (1): 17-24.doi: 10.3969/j.issn.1673-5854.2019.01.003

• 研究报告 • 上一篇    下一篇

松香基磁性微球的结构表征及其对Cr(Ⅵ)的吸附性能

黎克纯1(),卢建芳1,2,*(),雷福厚1,2,周菊英1,2,许海棠1,2,赵彦芝1,2   

  1. 1. 广西民族大学 化学化工学院, 广西 南宁 530006
    2. 广西林产化学与工程重点实验室, 广西 南宁 530006
  • 收稿日期:2017-10-31 出版日期:2019-01-30 发布日期:2019-03-15
  • 通讯作者: 卢建芳 E-mail:likechun@gxun.edu.cn;lujianfang@gxun.edu.cn
  • 作者简介:黎克纯(1984—)，男，广西崇左人，工程师，硕士，研究领域为水体中重金属污染治理；E-mail:likechun@gxun.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(21606056);广西高校中青年教师基础能力提升项目(2017KY0179);广西民族大学科研项目(2016MDYB025)

Structural Characterization of Rosin-based Magnetic Microspheres and Their Adsorption Properties of Cr(Ⅵ)

Kechun LI1(),Jianfang LU1,2,*(),Fuhou LEI1,2,Juying ZHOU1,2,Haitang XU1,2,Yanzhi ZHAO1,2   

  1. 1. School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
    2. Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Nanning 530006, China
  • Received:2017-10-31 Online:2019-01-30 Published:2019-03-15
  • Contact: Jianfang LU E-mail:likechun@gxun.edu.cn;lujianfang@gxun.edu.cn
  • Supported by:
    国家自然科学基金资助项目(21606056);广西高校中青年教师基础能力提升项目(2017KY0179);广西民族大学科研项目(2016MDYB025)

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摘要：

以马来松香乙二醇丙烯酸酯和甲基丙烯酸为单体，Fe3O4为磁源，通过悬浮聚合和酰胺化反应制备出松香基磁性微球。利用热重分析仪、红外光谱、比表面积与孔隙度分析仪、扫描电镜及磁天平对磁性微球进行表征，并通过静态吸附法研究了其对Cr(Ⅵ)的吸附性能。结果显示：松香基磁性微球既具有顺磁性(磁化率为9.123×10-4 cm3/g)，又具有功能基团(氨基)，比表面积、孔体积和平均孔径分别为29.73 m2/g、0.396 cm3/g和18.023 nm，表面和内部均有大量孔洞。当磁性微球粒径为72~108 μm时,在50 mL质量浓度为0.5 g/L Cr(Ⅵ)溶液中，调节pH值为2,吸附剂用量为0.8 g，25 ℃下振荡吸附，吸附平衡时间为4 h时，平衡吸附量为67.5 mg/g。动力学方程拟合结果显示吸附速率符合准一级动力学方程，吸附过程受液膜扩散和颗粒内部扩散共同影响。磁性微球循环使用5次，去除率仍达第一次吸附的85%以上，具有很好的循环使用性能。

关键词: 松香基磁性微球, 吸附, Cr(Ⅵ), 动力学

Abstract:

The rosin-based magnetic microspheres were synthesized by using maleic rosin acid-ethanediol-acrylic ester and methacrylic acid as functional monomer and ferriferrous oxide as magnetic source via suspension polymerization and amidation reaction. The structural and morphological properties of rosin-based magnetic microspheres were characterized by TG, FT-IR, BET, SEM and magnetic balance, and its static adsorption behavior for Cr(Ⅵ) was analyzed. The results showed that the rosin-based magnetic microspheres had paramagnetism(magnetic susceptibility was 9.123×10-4 cm3/g) and functional group(amino). The specific surface area, pore volume and average pore size were 29.73 m2/g, 0.396 cm3/g and 18.023 nm. And there were many holes in the surface and internal. The optimum static adsorption conditions were obtained as follows: pH value 2, absorbent dosage 0.8 g, adsorbent particle size 72-108 μm. Under these conditions, the equilibrium adsorption(Qe) was 67.5 mg/g after 4 h at 25 ℃ in 50 mL 0.5 g/L Cr(Ⅵ) solution. The pseudo-first-order kinetic equation that could well describe adsorption process was established, and the adsorption processes were affected by film diffusion and intra-particle diffusion. After using for 5 times, the removal rate of microspheres still reached 85% of the first adsorption, which indicated that the microspheres had good reusability.

Key words: rosin-based magnetic microspheres, adsorption, Cr(Ⅵ), kinetics

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