Spirulina platensis Immobilized Alginate Beads for Removal of Pb(II) from Aqueous Solutions

Oyunbileg Purev, Chulhyun Park, Hyunsoo Kim, Eunji Myung, Nagchoul Choi and Kanghee Cho ()
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Oyunbileg Purev: Department of Energy and Resource Engineering, Chosun University, Gwangju 61452, Republic of Korea
Chulhyun Park: Department of Energy and Resource Engineering, Chosun University, Gwangju 61452, Republic of Korea
Hyunsoo Kim: Department of Energy and Resource Engineering, Chosun University, Gwangju 61452, Republic of Korea
Eunji Myung: Green-Bio Research Facility Center, Seoul National University, Seoul 25354, Republic of Korea
Nagchoul Choi: Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
Kanghee Cho: Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea

IJERPH, 2023, vol. 20, issue 2, 1-16

Abstract: Microalgae contain a diversity of functional groups that can be used as environmental adsorbents. Spirulina platensis is a blue-green microalga that comprises protein-N, which is advantageous for use in nitrogen-containing biomass as adsorbents. This study aimed to enhance the adsorption properties of alginate hydrogels by employing Spirulina platensis . Spirulina platensis was immobilized on sodium alginate (S.P@Ca-SA) via crosslinking. The results of field-emission scanning electron microscopy, Fourier-transform infrared, and X-ray photoelectron spectroscopy analyses of the N-containing functional groups indicated that Spirulina platensis was successfully immobilized on the alginate matrix. We evaluated the effects of pH, concentration, and contact time on Pb(II) adsorption by S.P@Ca-SA. The results demonstrated that S.P@Ca-SA could effectively eliminate Pb(II) at pH 5, reaching equilibrium within 6 h, and the maximum Pb(II) sorption capacity of S.P@Ca-SA was 87.9 mg/g. Our results indicated that S.P@Ca-SA fits well with the pseudo-second-order and Freundlich models. Compared with Spirulina platensis and blank alginate beads, S.P@Ca-SA exhibited an enhanced Pb(II) adsorption efficiency. The correlation implies that the amino groups act as adsorption sites facilitating the elimination of Pb(II).

Keywords: Spirulina platensis; alginate; immobilization; Pb(?) removal; N-containing functional groups (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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