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Preparation and biosorption evaluation of Bacillus subtilis/alginate-chitosan microcapsule

Authors Tong K

Received 22 January 2016

Accepted for publication 10 March 2016

Published 3 February 2017 Volume 2017:10 Pages 35—43

DOI https://doi.org/10.2147/NSA.S104808

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Colin Mak

Peer reviewer comments 3

Editor who approved publication: Professor Israel (Rudi) Rubinstein


Ke Tong

College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, People’s Republic of China

Abstract: The aim of this study was to assess the effect of alginate–chitosan microcapsule on viability characteristics of Bacillus subtilis and the ability of B. subtilis/alginate–chitosan microcapsule to remove uranium ion from aqueous solution. The effects of particle size, chitosan molecular weight and inoculum density on viability characteristics were studied using alginate–chitosan microcapsule-immobilized B. subtilis experiments. In addition, the effects of pH, immobilized spherule dosage, temperature, initial uranium ion concentration and contact time on removal of uranium ion were studied using batch adsorption experiments. The results showed that alginate–chitosan microcapsule significantly improved the viability characteristics of B. subtilis and that B. subtilis/alginate–chitosan microcapsule strongly promoted uranium ion absorption. Moreover, the optimum values of pH was 6; immobilized spherule dosage was 3.5; temperature was 20°C; initial uranium ion concentration was 150 mg/L; contact time was 3 h of uranium ion absorption and the maximum adsorption capacity of uranium ion was 376.64 mg/g.

Keywords: alginate–chitosan microcapsule, Bacillus subtilis, viability characteristics, uranium ion, adsorption

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