应用化学 ›› 2022, Vol. 39 ›› Issue (11): 1746-1756.DOI: 10.19894/j.issn.1000-0518.220069

• 研究论文 • 上一篇    下一篇

亚铁氰化铜-聚丙烯酰胺/羧甲基纤维素/石墨烯复合水凝胶的制备及铷吸附性能

袁定坤(), 褚维凡, 倪加惠   

  1. 合肥工业大学化学与化工学院,合肥 230009
  • 收稿日期:2022-03-14 接受日期:2022-06-08 出版日期:2022-11-01 发布日期:2022-11-09
  • 通讯作者: 袁定坤
  • 基金资助:
    科技部“科技助力经济2020”重点专项(SQ2020YFF0412719)

Preparation of Copper Ferrocyanide⁃Polyacrylamide/ Carboxymethyl Cellulose/Graphene Composite Hydrogel and Its Adsorption Performance of Rubidium

Ding-Kun YUAN(), Wei-Fan CHU, Jia-Hui NI   

  1. School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China
  • Received:2022-03-14 Accepted:2022-06-08 Published:2022-11-01 Online:2022-11-09
  • Contact: Ding-Kun YUAN
  • About author:yuandingkun1124@163.com
  • Supported by:
    the 2020 Key Science and Technology Ministry of Power Economy Special(SQ2020YFF0412719)

摘要:

铷是一种稀贵的碱金属,具有很高的经济价值和广阔应用前景,从卤水中有效提取铷具有重要意义。通过热引发聚合法合成水凝胶基质(聚丙烯酰胺/羧甲基纤维素/氧化石墨烯水凝胶,PCG)固定亚铁氰化铜(KCuFC),制备了一种新型的铷(Rb+)吸附剂(KCuFC-PCG)。采用物理化学方法对KCuFC-PCG的结构和性质进行了表征。通过批量吸附实验,研究了pH值、吸附时间、Rb+初始质量浓度、温度和竞争离子对吸附的影响。结果表明,KCuFC-PCG吸附剂在pH值(5~9)范围内表现出良好的吸附能力,pH=8时表现最佳;在Rb+质量浓度为5 mg/L,pH=8,吸附6 h达到吸附平衡,KCuFC-PCG的对Rb+的吸附量为89.12 mg/g;动力学行为可用准二级动力学模型来描述,表明化学吸附为速率控制步骤;吸附过程符合Langmuir等温吸附模型,为单分子层吸附,最大吸附量为258.4 mg/g。以0.2 mol/L NH4Cl作为解吸剂,解吸3 h,解吸率为77%。

关键词: 羧甲基纤维素, 亚铁氰化铜, 水凝胶, 吸附, 铷离子

Abstract:

Rubidium is a rare alkali metal with high economic value and promising applications, and it is of great importance to effectively extract rubidium from brines. A novel rubidium (Rb+) adsorbent (KCuFC-PCG) is prepared by synthesizing a hydrogel matrix (polyacrylamide/carboxymethylcellulose/graphene oxide hydrogel, PCG) immobilized with copper ferrocyanide (KCuFC) by thermal initiation polymerization. The structure and properties of KCuFC-PCG are characterized by physicochemical methods. The effects of pH, contact time, initial mass concentration of Rb+, temperature and competing ions on the adsorption are investigated by batch adsorption experiments. The results show that the KCuFC-PCG adsorbent exhibits good adsorption capacity in the pH range (5~9), with the best performance at pH=8. The adsorption equilibrium can be reached at 6 h under the conditions of 5 mg/L Rb+ and pH=8, and the adsorption capacity of KCuFC-PCG is 89.12 mg/g. The kinetic behavior can be described by a quasi-secondary kinetic model, indicating that the adsorption process is dominated by chemisorption. The adsorption process is in accordance with the Langmuir isothermal adsorption model, and it is a single molecular layer adsorption with a maximum adsorption capacity of 258.4 mg/g. The desorption rate is 77% at 3 h with 0.2 mol/L NH4Cl as desorbent.

Key words: Carboxymethyl cellulose, Copper ferrocyanide, Hydrogel, Adsorption, Rubidium ion

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