Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material

Wang, Jia; Guan, Mengyi; Qin, Zijian; Zhang, Shihao; Cheng, Jian; Xin, Baoping

doi:10.3390/w17111630

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Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material

by

Jia Wang

^1,2,

Mengyi Guan

¹,

Zijian Qin

¹,

Shihao Zhang

³,

Jian Cheng

³ and

Baoping Xin

^3,*

¹

Beijing International Cooperation Base for Science and Technology of E-Waste Resource Recovery, College of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100080, China

²

Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063000, China

³

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

^*

Author to whom correspondence should be addressed.

Water 2025, 17(11), 1630; https://doi.org/10.3390/w17111630

Submission received: 17 April 2025 / Revised: 9 May 2025 / Accepted: 26 May 2025 / Published: 27 May 2025

(This article belongs to the Section Wastewater Treatment and Reuse)

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Abstract

In this study, a Zn-Mn ferrite soft magnetic material (Mn_0.6Zn_0.4Fe₂O₄) was successfully prepared from a spent Zn-Mn battery using a novel multi-step process involving bioleaching, co-precipitation, and boiling reflux. The green Zn–Mn ferrite exhibited optimal magnetic properties, with Ms, Mr, and Hc values of 68.9 emu/g, 4.7 emu/g, and 53.6 Oe, respectively. The adsorption kinetics and isotherms of Cd (II), As (III), and Pb (II) in wastewater on Mn_0.6Zn_0.4Fe₂O₄ were subsequently investigated. The sorption dosages of Cd (II), As (III), and Pb (II) were 22.9 mg/g, 8.7 mg/g, and 33.9 mg/g, respectively. The pseudo-second-order kinetic model provided a fitting correlation with the experimental data. The adsorption process exhibited a good correlation with the Langmuir model, with R² = 0.997, and the q_m and b values were 33.44 mg/g and 2.43 L/mg, respectively. The sorption rates followed the sequence Pb (II) > Cd (II) > As (III). On increasing the temperature, the saturated adsorption capacity of the Cd (II), As (III), and Pb (II) increased, thus indicating that the adsorption reaction was endothermic, with the corresponding activation energy (Ea) values determined to be 9.5 KJ/mol, 32.2 KJ/mol, and 1.4 KJ/mol, respectively.

Keywords: spent Zn-Mn battery; Zn-Mn ferrite soft magnetic material (Mn_0.6Zn_0.4Fe₂O₄); magnetic separation; heavy-metal wastewater; adsorption

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MDPI and ACS Style

Wang, J.; Guan, M.; Qin, Z.; Zhang, S.; Cheng, J.; Xin, B. Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material. Water 2025, 17, 1630. https://doi.org/10.3390/w17111630

AMA Style

Wang J, Guan M, Qin Z, Zhang S, Cheng J, Xin B. Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material. Water. 2025; 17(11):1630. https://doi.org/10.3390/w17111630

Chicago/Turabian Style

Wang, Jia, Mengyi Guan, Zijian Qin, Shihao Zhang, Jian Cheng, and Baoping Xin. 2025. "Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material" Water 17, no. 11: 1630. https://doi.org/10.3390/w17111630

APA Style

Wang, J., Guan, M., Qin, Z., Zhang, S., Cheng, J., & Xin, B. (2025). Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material. Water, 17(11), 1630. https://doi.org/10.3390/w17111630

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Adsorption Kinetics and Isotherms of Cd (II), As (III), and Pb (II) on Green Zn-Mn Ferrite Soft Magnetic Material

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