Inorganic Chemicals Industry ›› 2026, Vol. 58 ›› Issue (3): 85-95.doi: 10.19964/j.issn.1006-4990.2025-0113

• Environment·Health·Safety • Previous Articles     Next Articles

Study on preparation of electrolytic manganese slag-based composites and their Cd2+ removal

HAN Qingwen1(), YUAN Jiaxin2,3, ZHAN Wei2,3(), HUANG Ping2,3, NAN Fangming2,3, CHEN Donghui2,3, TAN Jie2,3   

  1. 1.Hubei Three Gorges Laboratory,Yichang 443007,China
    2.Hubei Engineering Research Center for Heavy Metal Pollution Prevention and Control,School of Resources and Environment,South-Central Minzu University,Wuhan 430074,China
    3.Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,Wuhan 430074,China
  • Received:2025-03-08 Online:2026-03-10 Published:2025-09-25
  • Contact: ZHAN Wei E-mail:qingwenhan@qq.com;zw7789818@mail.scuec.edu.cn

Abstract:

In this study,Ca-Fe-Mn composite materials(CFM) were prepared by acid leaching-co-precipitation method for the resource utilisation of electrolytic manganese residue(EMR) and the treatment of cadmium-containing wastewater to systematically investigate the removal efficacy and mechanism of Cd2+.The effects of CFM dosage(0.2~1.5 g/L),initial pH(2.0~7.0) and reaction temperature(303~323 K) were investigated to elucidate the Cd2+ removal mechanism by combining with the adsorption kinetics,isothermal model fitting,and characterisation by X-ray diffractometer(XRD) and scanning electron microscope(SEM).The results showed that the Cd2+ concentration in the effluent was reduced to below 0.1 mg/L when the dosage of CFM was 1.0 g/L,which met the limit value of “Comprehensive Wastewater Discharge Standard”(GB 8978—1996).The maximum theoretical adsorption capacity of 129.96 mg/g was achieved at 323 K in a wide range of pH 3.0~7.0,and the Cd2+ removal rate was >99%.The adsorption process was conformed to the quasi-secondary kinetic model(R2>0.99) and Langmuir model (R2>0.98),which indicated that the removal of Cd2+ by CFM was a monolayer adsorption with chemisorption as the main method,and the rate of the whole adsorption process was mainly controlled by surface diffusion.The characterisation results demonstrated that the Cd2+ removal mechanism was a synergistic effect of surface precipitation,electrostatic attraction,interlayer intercalation and homogeneous substitution.The material combined high adsorption efficiency,wide pH adaptability and stability,and the process was simple and low cost,which provided a new way for EMR resourcefulness and heavy metal pollution control.

Key words: electrolytic manganese residue, removal Cd2+, acid leaching-co-precipitation, Ca-Fe-Mn composite materials

CLC Number: