Adsorption of cadmium and lead from aqueous solution using modified biochar: A review. Issue 1 (February 2022)

• Record Type: Journal Article
• Authors: Liu, Tianqi; Lawluvy, Yelly; Shi, Yang; Ighalo, Joshua O.; He, Yide; Zhang, Yongjun; Yap, Pow-Seng
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 1(2022)
• Publication Date: 2022-02
• Subjects: Modified biochar -- Cadmium -- Lead -- Adsorption kinetic models -- Adsorption isotherm models -- Regeneration; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106502
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Cadmium (Cd) and lead (Pb) contaminations are disturbing environmental issues, which cause serious harm to aqueous systems and human health. Therefore, removing them from aqueous solution is essential to prevent their damage to the environment. Environmental adsorption research as one solution is promising and has been getting a lot of attention in the recent years. Using modified biochar has proved to be more suitable for the adsorption of cadmium and lead. In this review, the sources of cadmium and lead in the environment and their hazards have been elucidated. In addition, the preparation methods of modified biochar to remove Cd and Pb have been discussed. This review also presents the adsorption kinetics and isotherms results for the adsorption of Cd and Pb from aqueous solution using modified biochar. The effect of experimental parameters and adsorption mechanisms are also discussed in order to understand the adsorption performances of modified biochar in great detail. The adsorption mechanisms were surface precipitation, surface complexation, ion exchange, chelation, electrostatic attraction, inner sphere complexation, redox and physical adsorption. The adsorption was mainly endothermic and spontaneous. Additionally, the results on the regeneration of modified biochar are presented to provide a direction for sustainable improvement. Finally, this review article also provides the challenges, prospects and future perspectives of adsorption of cadmium and lead from aqueous solutions using the modified biochar. Graphical Abstract: ga1 Highlights: Cadmium and lead have harmful effects on the human body. Modified biochar can effectively remove cadmium and lead from aqueous solution. Adsorption kinetics, isotherms, thermodynamics and mechanisms of modified biochar are reviewed. Regeneration of modified biochar plays an important role in the sustainable development.