SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 61 ›› Issue (9): 192-200.DOI: 10.1016/j.cjche.2023.02.009

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Boron separation by adsorption and flotation with Mg–Al-LDHs and SDBS from aqueous solution

Chun Bai1, Huifang Zhang2,3, Qinglong Luo2,3, Xiushen Ye2,3, Haining Liu2,3, Quan Li2,3, Jun Li2,3, Zhijian Wu2,3   

  1. 1. School of Chemical Engineering, Qinghai University, Xining 810016, China;
    2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
  • Received:2022-07-04 Revised:2023-02-21 Online:2023-12-14 Published:2023-09-28
  • Contact: Huifang Zhang,E-mail:zhanghf@isl.ac.cn;Zhijian Wu,E-mail:zjwu@isl.ac.cn
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (U20A20150), the National Key Research and Development Program of China (2018YFC1903802), the Youth Scientific Research Fund of Qinghai University (2022-QGY-4), and the Kunlun Talent Program of Qinghai Province.

Boron separation by adsorption and flotation with Mg–Al-LDHs and SDBS from aqueous solution

Chun Bai1, Huifang Zhang2,3, Qinglong Luo2,3, Xiushen Ye2,3, Haining Liu2,3, Quan Li2,3, Jun Li2,3, Zhijian Wu2,3   

  1. 1. School of Chemical Engineering, Qinghai University, Xining 810016, China;
    2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
  • 通讯作者: Huifang Zhang,E-mail:zhanghf@isl.ac.cn;Zhijian Wu,E-mail:zjwu@isl.ac.cn
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (U20A20150), the National Key Research and Development Program of China (2018YFC1903802), the Youth Scientific Research Fund of Qinghai University (2022-QGY-4), and the Kunlun Talent Program of Qinghai Province.

Abstract: Layered double hydroxides (LDHs) have been shown to be effective adsorbents for boron. However, solid–liquid separation is still a problem when separating boron from industrial radioactive waste liquid. In this research, three types of Mg–Al-LDHs including Mg–Al-LDH(NO3), Mg–Al-LDH(Cl) and Mg–Al-LDH(SO42–) were applied to adsorb boron, and moreover sodium dodecylbenzenesulfonate (SDBS) was used to float the LDH particles from aqueous solution after boron adsorption. The results showed that 60 min was sufficient for the equilibrium adsorption of the three LDHs. The boron adsorption capacity of three LDHs was determined as follows: Mg–Al-LDH(NO3) > Mg–Al-LDH(Cl) > Mg–Al-LDH(SO42–), and was 2.0, 0.98 and 0.2 mmol·g-1, each ranging from 0 to 80 mmol·L–1 with the initial boron concentration. The efficiency of boron removal by Mg–Al-LDH(NO3) and SDBS can reach up to 89.7%. Furthermore, the boron flotation mechanism of SDBS and LDHs has been studied, since SDBS as a flotation agent can react with LDHs and penetrate into the interlayer of LDHs in addition to electrostatic attraction. Therefore, LDHs in solution can be floated onto the foam layer to be separated from the solution, and the clarified solution was obtained. The method is simple and promising for boron removal from aqueous solution.

Key words: Boron, Separation, Adsorption, Flotation, Layered double hydroxide, Sodium dodecyl benzene sulfonate

摘要: Layered double hydroxides (LDHs) have been shown to be effective adsorbents for boron. However, solid–liquid separation is still a problem when separating boron from industrial radioactive waste liquid. In this research, three types of Mg–Al-LDHs including Mg–Al-LDH(NO3), Mg–Al-LDH(Cl) and Mg–Al-LDH(SO42–) were applied to adsorb boron, and moreover sodium dodecylbenzenesulfonate (SDBS) was used to float the LDH particles from aqueous solution after boron adsorption. The results showed that 60 min was sufficient for the equilibrium adsorption of the three LDHs. The boron adsorption capacity of three LDHs was determined as follows: Mg–Al-LDH(NO3) > Mg–Al-LDH(Cl) > Mg–Al-LDH(SO42–), and was 2.0, 0.98 and 0.2 mmol·g-1, each ranging from 0 to 80 mmol·L–1 with the initial boron concentration. The efficiency of boron removal by Mg–Al-LDH(NO3) and SDBS can reach up to 89.7%. Furthermore, the boron flotation mechanism of SDBS and LDHs has been studied, since SDBS as a flotation agent can react with LDHs and penetrate into the interlayer of LDHs in addition to electrostatic attraction. Therefore, LDHs in solution can be floated onto the foam layer to be separated from the solution, and the clarified solution was obtained. The method is simple and promising for boron removal from aqueous solution.

关键词: Boron, Separation, Adsorption, Flotation, Layered double hydroxide, Sodium dodecyl benzene sulfonate