化工学报 ›› 2018, Vol. 69 ›› Issue (2): 848-857.DOI: 10.11949/j.issn.0438-1157.20170634

• 材料化学工程与纳米技术 • 上一篇    下一篇

新型壳聚糖/锆复合球的制备及硼吸附性能

王雄1, 刘明言1,2   

  1. 1 天津大学化工学院, 天津化学化工协同创新中心, 天津 300350;
    2 化学工程联合国家重点实验室(天津大学), 天津 300350
  • 收稿日期:2017-05-16 修回日期:2017-07-20 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: 刘明言

Characteristics of boron adsorption onto a novel chitosan/zirconium composite particles

WANG Xiong1, LIU Mingyan1,2   

  1. 1 Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
    2 State Key Laboratory of Chemical Engineering(Tianjin University), Tianjin 300350, China
  • Received:2017-05-16 Revised:2017-07-20 Online:2018-02-05 Published:2018-02-05

摘要:

通过氧氯化锆与壳聚糖的配位反应以及Zr (OH)4在壳聚糖内的原位沉淀,制备了一种新型壳聚糖-锆复合球(CTS-Zr)并用于硼的吸附分离。采用扫描电子显微镜(SEM)和傅里叶红外光谱(FTIR)对CTS-Zr进行了表征,系统考察了溶液pH、硼初始浓度、接触时间、温度及共存阴离子Cl-、NO3-和SO42-对CTS-Zr吸附性能的影响。结果表明:pH=2~7时,CTS-Zr对硼的吸附效率较高;吸附平衡行为符合Langmuir等温吸附模型;pH=7时,最大吸附量计算值为21.1 mg·g-1;吸附动力学符合准二级动力学模型;常见的共存阴离子对硼的吸附影响很小;吸附热力学研究表明,CTS-Zr对硼的吸附过程为放热的非自发过程;使用pH=12的NaOH水溶液,对吸附剂CTS-Zr进行了洗脱,洗脱效率为96.3%,且经过3次吸附-解吸循环后,CTS-Zr的吸附效率没有明显降低。

关键词: 壳聚糖, 锆, 复合球, 硼, 吸附, 模型

Abstract:

A new type of chitosan-zirconium composite particles (CTS-Zr) has been prepared through coordination reaction between zirconium oxychloride and chitosan, and in-situ precipitation of zirconium hydroxide for the adsorption of boron from solution. The CTS-Zr composite was characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The effects of pH, initial boron concentration, contact time, temperature and co-existing ions Cl-, NO3-, and SO42- on adsorption performance were also investigated systematically. The results demonstrated that prepared adsorbent could maintain high boron adsorption efficiency in a pH range from 2 to 7. The equilibrium adsorption behavior of boron on the CTS-Zr composite had a good agreement with the Langmuir isotherm model, and the maximum adsorption capacity was calculated as 21.1 mg·g-1 with pH of 7. The uptake kinetics was fitted well with the pseudo-second order rate equation, and the common coexisting anions almost had no negative effect on the boron adsorption. The results of adsorption thermodynamics of boron on CTS-Zr indicate the exothermic and not spontaneous nature of the adsorption process. The boron adsorbed on CTS-Zr particles was regenerated with an efficiency of 96.3% using NaOH solution of pH of 12, and the adsorption efficiency was not significantly reduced after three adsorption-desorption cycles.

Key words: chitosan, zirconium, composite particles, boron, adsorption, model

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