Study on Competitive Adsorption of Ni2+ and Cu2+ by Steel Slag

Abstract

Abstract: The adsorption performance and mechanism of converter steel slag for Ni²⁺ in aqueous solution were discussed from the aspects of steel slag dosage, adsorption time and acid conditions, and the effect of Cu²⁺ on the adsorption of Ni²⁺by steel slag was also discussed. The results show that when 100 mL Ni²⁺ solution with a concentration of 50 mg·L^-1 is treated with 200 mesh (0.074 mm) 0.15 g steel slag at 25 ℃ for 30 min, the adsorption capacity of Ni²⁺ is 33.290 mg·g^-1 (adsorption rate is 99.88%). The adsorption process of Ni²⁺ by steel slag conforms to the pseudo-second-order kinetic equation and Freundlich isothermal model, and the correlation coefficient R² is 0.984 and 0.994, respectively. The adsorption of Ni²⁺ and Cu²⁺ by steel slag belongs to competitive adsorption, and the adsorption capacity of Cu²⁺ by steel slag is better than that of Ni²⁺. When the pH value is very low, the adsorption effect of steel slag on Ni²⁺ and Cu²⁺ is poor. The adsorption process of steel slag on Ni²⁺ is mainly chemical adsorption, accompanied by physical adsorption, and with the decrease of adsorption sites on the steel slag surface, the physical adsorption of steel slag on Ni²⁺ will gradually weaken. The research may provide some guidance to the treatment of industrial wastewater containing Ni²⁺ and Cu²⁺.

Key words: steel slag, adsorption, Ni²⁺, Cu²⁺, competitive adsorption, effluent treatment

CLC Number:

X705

FENG Shanshan, WANG Kaiju, ZHANG Lanyue, GU Zixuan, LI Canhua. Study on Competitive Adsorption of Ni²⁺ and Cu²⁺ by Steel Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1750-1757.

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Study on Competitive Adsorption of Ni²⁺ and Cu²⁺ by Steel Slag

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