4.6 Article

Biosorption of lead ions from aqueous solution by Clostridium tyrobutyricum immobilized in macroporous Ca-alginate-lignin beads

Journal

JOURNAL OF APPLIED MICROBIOLOGY
Volume 132, Issue 3, Pages 2080-2092

Publisher

OXFORD UNIV PRESS
DOI: 10.1111/jam.15387

Keywords

adsorption isotherm models; adsorption kinetics models; Clostridium tyrobutyricum; lead ions; macroporous Ca-alginate-lignin beads

Funding

  1. National Natural Science Foundation of China [31922070]
  2. Natural Science Foundation of Jiangsu Province [BK20180038]
  3. Jiangsu Students' platform for innovation and entrepreneurship training program [201910291086Z, 201910291172Y]

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The study found that the immobilized Clostridium tyrobutyricum in MCAL beads has better adsorption effects on lead ions, demonstrating practicality and potential value in treating lead ions in aqueous solutions.
Aims The adsorption of lead ions from aqueous solution by macroporous Ca-alginate-lignin (MCAL) beads immobilized with Clostridium tyrobutyricum and free strains was evaluated. Methods and Results The effects of different factors including pH, adsorption time, adsorbent dosage and initial concentration of lead ions were explored. Different characterization methods were used to evaluate the adsorption process of lead ions. Meanwhile, the adsorption kinetics models and adsorption isotherm models were applied. The fitting results showed that the adsorption behaviour of C. tyrobutyricum immobilized in MCAL beads and free strains was better described by the pseudo-second-order kinetic model and the adsorption process followed the Langmuir isotherm model. The maximum biosorption of lead ions by C. tyrobutyricum immobilized in MCAL beads and free strains was 144.9 and 106.4 mg/g respectively. Conclusions The C. tyrobutyricum immobilized in MCAL beads proved to be practicable and had better adsorption effects on lead ions compared with the free strains. Significance and Impact of the Study The paper demonstrated a new insight and strategy for the effective treatment of lead ions from aqueous solutions by the novel function of C. tyrobutyricum.

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