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

Longfei Zhang, Ping Wang, Xiqing Wang, Qi Zhang, Yunpu Wang, Yuhuan Liu, Lantian Zhao, Roger Ruan, Xian Cui

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number120213
JournalJournal of Environmental Management
Volume353
DOIs
StatePublished - Feb 27 2024

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • Alternating dry–wet process
  • Bentonite
  • Copper
  • Enzymolysis
  • Wastepaper

PubMed: MeSH publication types

  • Journal Article

Fingerprint

Dive into the research topics of 'Resource utilization of wastepaper and bentonite: Cu(II) removal in the aqueous environment'. Together they form a unique fingerprint.

Cite this