Resource utilization of wastepaper and bentonite: Cu(II) removal in the aqueous environment.

Autor: Zhang, Longfei1 (AUTHOR), Wang, Ping1 (AUTHOR), Wang, Xiqing1,2 (AUTHOR) xiqingwang91@hbuas.edu.cn, Zhang, Qi1 (AUTHOR), Wang, Yunpu1 (AUTHOR), Liu, Yuhuan1 (AUTHOR) liuyuhuan@ncu.edu.cn, Zhao, Lantian3 (AUTHOR), Ruan, Roger4 (AUTHOR), Cui, Xian1 (AUTHOR) cuixian@ncu.edu.cn
Zdroj: Journal of Environmental Management. Feb2024, Vol. 353, pN.PAG-N.PAG. 1p.
Abstrakt: Contamination of heavy metals has always been a pressing concern. The dry-wet alternately treated carboxymethylcellulose bentonite (DW-CB) was successfully prepared by intercalating bentonite (BT) with carboxymethyl cellulose (CMC) obtained by solvent processes using enzymatically digested wastepaper as cellulosic raw material, and the adsorption capacity of Cu2+ on DW-CB in aqueous solution was investigated. A 98.18 ± 2.31 % removal efficiency was achieved by 4 g/L of DW-CB after 8 h in a solution containing 100 mg/L of Cu2+, which were 4.1 times and 1.5 times of that of BT and adsorbent prepared without alternating dry-wet process, respectively. The introduction of –COOH groups during the preparation of DW-CB enhanced the electrostatic interaction between DW-CB and Cu2+, which was the main driving force for Cu2+ removal. The pseudo-first-order kinetic model and Langmuir model better described the adsorption process and adsorption capacity of Cu2+ on DW-CB. DW-CB still showed high removal of Cu2+ (19.61 ± 0.99 mg/g) in the presence of multiple metal ions, while exhibiting the potential for removal of Zn2+, Mg2+ and K+, especially Mg2+ (22.69 ± 1.48 mg/g). However, the interactions of organics with Cu2+ severely affected the removal of Cu2+ by DW-CB (removal efficiency: 17.90 ± 4.17 % - 95.33 ± 0.27 %). In this study, an adsorbent with high targeted adsorption of Cu2+ was prepared by utilizing wastepaper and BT, which broadened the way of wastepaper resource utilization and had good economic and social benefits. [Display omitted] • Bentonite was intercalated by carboxymethylcellulose prepared from wastepaper. • The alternating dry–wet process improved Cu2+ removal by intercalated bentonite. • The removal efficiency of Cu2+ on intercalated bentonite was 98.18 %. • The intercalated bentonite showed good potential for removing multiple metal ions. • The introduction of -COO- was the key to Cu2+ removal by intercalated bentonite. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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