物理化学学报 >> 2016, Vol. 32 >> Issue (10): 2563-2573.doi: 10.3866/PKU.WHXB201607122

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超声辅助高吸附型复合凝胶的制备及对水中Pb(Ⅱ)的响应和去除性能

王吟*(),熊扬,孙凤玲,杨一琼,张晓东*()   

  • 收稿日期:2016-05-31 发布日期:2016-09-30
  • 通讯作者: 王吟,张晓东 E-mail:625xiaogui@163.com;fatzhxd@126.com
  • 基金资助:
    上海市青年科技英才扬帆计划(16YF1408100,14YF1409900);国家自然科学基金青年科学基金(21507086)

Ultrasonic-Assisted Synthesis of a Superabsorbent Composite Hydrogel for the Responsive and Removal Properties of Pb(Ⅱ)

Yin WANG*(),Yang XIONG,Feng-Ling SUN,Yi-Qiong YANG,Xiao-Dong ZHANG*()   

  • Received:2016-05-31 Published:2016-09-30
  • Contact: Yin WANG,Xiao-Dong ZHANG E-mail:625xiaogui@163.com;fatzhxd@126.com
  • Supported by:
    the Shanghai Sailing Program, China(16YF1408100,14YF1409900);National Natural Science Foundation of China(21507086)

摘要:

以秸秆纤维素和木质素为原料,通过超声辅助法制得了新型纤维素-木质素复合凝胶(UCHy)。对样品进行扫描电镜(SEM)、傅里叶变换红外(FT-IR)光谱和X射线衍射(XRD)表征分析,考察了其在不同浓度Pb(Ⅱ)中的溶胀性能,研究了pH值、反应时间、温度、Pb(Ⅱ)初始浓度对其吸附能力的影响。结果表明,纤维素和木质素的添加有利于凝胶形成致密的纤维束堆积结构,超声作用则能促进凝胶连续孔洞微结构的形成,因而具备较高的溶胀率以及污染物吸附量。溶胀初期Pb(Ⅱ)溶液在UCHy中的扩散行为可用non-Fickian扩散定律描述,整体溶胀行为符合Schott’s准二级动力学方程。UCHy对Pb(Ⅱ)的吸附量随溶液pH值的增大而增大,随反应温度的升高而减小。吸附等温数据同时符合Langmuir与Freundlich模型,饱和吸附容量为786.16 mg·g-1,吸附过程符合拟二级动力学方程。该复合凝胶表现出极高重金属的吸附性能和敏感性,具有较大的应用前景。

关键词: 复合凝胶, 超声辅助, Pb(Ⅱ), 吸附, 重金属响应

Abstract:

A new kind of cellulose-lignin composite hydrogel (UCHy) was prepared under ultrasonic irradiation using cellulose and lignin as raw materials. The resulting material was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) analysis. The swelling properties of UCHy were also investigated at a variety of different Pb(Ⅱ) concentrations, whilst its adsorption capacity was studied as a function of pH, reaction time, temperature, and concentration of the Pb (Ⅱ) solution under ambient conditions. The results showed that cellulose and lignin were beneficial to the formation of a denser structure, and that the ultrasonic treatment promoted the formation of the continuous pore microstructure of the hydrogel, resulting in a high swelling ratio and pollutant adsorption capacity. The swelling kinetics indicated that the initial solution intake of the composite hydrogel followed a non-Fickian type diffusion, and that the whole swelling process was fit for the Schott's model well. The adsorption capacity of Pb(Ⅱ) increased as the pH of the solution increased, and decreases with increasing temperature. The adsorption isotherm data followed the Langmuir and Freundlich models, with an optimum adsorption value of 786.16 mg·g-1. The adsorption rate closely followed a pseudo-second order model. As a result, UCHy showed good responsive and adsorption properties towards heavy metal ions, and therefore represents a promising material for the detection and removal of heavy metal ions from aqueous solutions.

Key words: Composite hydrogel, Ultrasonic-assisted, Pb(Ⅱ), Adsorption, Heavy metal-responsive

MSC2000: 

  • O647