SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 62 ›› Issue (10): 31-45.DOI: 10.1016/j.cjche.2023.03.027

• Full Length Article • 上一篇    下一篇

Synthesis of zeolite A and zeolite X from electrolytic manganese residue, its characterization and performance for the removal of Cd2+ from wastewater

Wenlei Li, Huixin Jin, Hongyan Xie, Lianren Ma   

  1. College of Material and Metallurgy, Guizhou University, Guiyang 550025, China
  • 收稿日期:2023-01-26 修回日期:2023-03-13 出版日期:2023-10-28 发布日期:2023-12-23
  • 通讯作者: Hongyan Xie,E-mail:hyxie@gzu.edu.cn
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (52164036, U1960201, 51764007) and the Guizhou Province Graduate Research Fund (YJSKYJJ(2021)003).

Synthesis of zeolite A and zeolite X from electrolytic manganese residue, its characterization and performance for the removal of Cd2+ from wastewater

Wenlei Li, Huixin Jin, Hongyan Xie, Lianren Ma   

  1. College of Material and Metallurgy, Guizhou University, Guiyang 550025, China
  • Received:2023-01-26 Revised:2023-03-13 Online:2023-10-28 Published:2023-12-23
  • Contact: Hongyan Xie,E-mail:hyxie@gzu.edu.cn
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (52164036, U1960201, 51764007) and the Guizhou Province Graduate Research Fund (YJSKYJJ(2021)003).

摘要: Electrolytic manganese residue (EMR) can cause serious environmental and biological hazards. In order to solve the problem, zeolite A (EMRZA) and zeolite X (EMRZX) were synthesized by EMR. The pure phase zeolites were synthesized by alkaline melting and hydrothermal two-step process, which had high crystallinity and excellent crystal control. And the optimum conditions for synthesis of zeolite were investigated: NaOH-EMR mass ratio = 1.2, L/S = 10, hydrothermal temperature = 90 ℃, and hydrothermal time = 6 h. Then, EMRZA and EMRZX showed excellent adsorption of Cd2+. When T = 25 ℃, time = 120 min, pH = 6, C0 = 518 mg·L-1, and quantity of absorbent = 1.5 g·L-1, the adsorption capacities of EMRZA and EMRZX reached 314.2 and 289.5 mg·g-1, respectively. In addition, after three repeated adsorption–desorption cycles, EMRZA and EMRZX retained 80% and 74% of the initial zeolites removal rates, respectively. Moreover, adsorption results followed quasi-second-order kinetics and monolayer adsorption, which was regulated by a combination of chemisorption and intra-particle diffusion mechanisms. The adsorption mechanism was ions exchange between Cd2+ and Na+. In summary, it has been confirmed that EMRZA and EMRZX can be reused as highly efficient adsorbents to treat Cd2+-contaminated wastewater.

关键词: Electrolytic manganese residue, Zeolite A, Zeolite X, Adsorption, Cd ions

Abstract: Electrolytic manganese residue (EMR) can cause serious environmental and biological hazards. In order to solve the problem, zeolite A (EMRZA) and zeolite X (EMRZX) were synthesized by EMR. The pure phase zeolites were synthesized by alkaline melting and hydrothermal two-step process, which had high crystallinity and excellent crystal control. And the optimum conditions for synthesis of zeolite were investigated: NaOH-EMR mass ratio = 1.2, L/S = 10, hydrothermal temperature = 90 ℃, and hydrothermal time = 6 h. Then, EMRZA and EMRZX showed excellent adsorption of Cd2+. When T = 25 ℃, time = 120 min, pH = 6, C0 = 518 mg·L-1, and quantity of absorbent = 1.5 g·L-1, the adsorption capacities of EMRZA and EMRZX reached 314.2 and 289.5 mg·g-1, respectively. In addition, after three repeated adsorption–desorption cycles, EMRZA and EMRZX retained 80% and 74% of the initial zeolites removal rates, respectively. Moreover, adsorption results followed quasi-second-order kinetics and monolayer adsorption, which was regulated by a combination of chemisorption and intra-particle diffusion mechanisms. The adsorption mechanism was ions exchange between Cd2+ and Na+. In summary, it has been confirmed that EMRZA and EMRZX can be reused as highly efficient adsorbents to treat Cd2+-contaminated wastewater.

Key words: Electrolytic manganese residue, Zeolite A, Zeolite X, Adsorption, Cd ions