Enhancing cadmium removal efficiency through spinel ferrites modified biochar derived from agricultural waste straw. Issue 1 (February 2023)

• Record Type: Journal Article
• Authors: Bai, Ma; Chai, Youzheng; Chen, Anwei; Yuan, Jiayi; Shang, Cui; Peng, Liang; Peng, Cheng
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 1(2023)
• Publication Date: 2023-02
• Subjects: Spinel bimetal -- Sol-gel method -- Cadmium -- Adsorption -- Biochar; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.109027
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Water pollution caused by heavy metals poses a serious threat to the ecological environment and human health, which requires the exploration of efficient, economical and convenient methods to solve such urgent problems. In this work, agricultural waste straw was prepared and modified by spinel bimetal through sol-gel method to obtain novel MnFe2 O4 loaded biochar with the purpose of efficiently cadmium (Cd) removal from water. Results showed that the as-prepared composites showed much higher Cd adsorption capacity as compared to the original biochar (127.37 vs 25.73 mg/g). Further investigation showed that the integrity of crystal plane structure contributes to the appearance of net-like pore and the 18-fold enlarged specific surface area. Strong anti-interference ability of the spinel loaded biochar was observed in binary and quaternary systems through adsorption affinity investigation using separation factor ( α Metal Cd, Metal =Pb, Zn, Cu). Due to its magnetic properties, the adsorbent was easily separated and recovered from aquatic solutions, and the adsorption capacity showed little decrease after five cycles. This work provided the references for resource utilization of agricultural wastes and its application in wastewater treatment. Graphical Abstract: ga1 Highlights: Biomass-derived biochar prepared through spinel bimetal sol-gel method. Adsorbent keeps great adsorption capacity for heavy metals in mixed systems. The biochar shows excellent separation, recyclability, and stability in Cd removal. Adsorption preference was accurately explored through the separation factor ( α 2 1 ).