Adsorption of Cd (II) by a novel living and non-living Cupriavidus necator GX_5: optimization, equilibrium and kinetic studies

BMC Chemistry

Research

Liyan Liu¹  Jiejie Kong¹  Qin Shao¹  Zhigang Zhao²  Xiaopeng Li²  Xingjie Li³  Qiusheng Xiao³  Rungen Li⁴ 

[1] College of Life Science and Environmental Resources, Yichun University, 336000, Yichun, China;College of Life Science and Environmental Resources, Yichun University, 336000, Yichun, China;Engineering Technology Research Center of Jiangxi Universities and Colleges for Selenium Agriculture, 336000, Yichun, China;College of Life Science and Environmental Resources, Yichun University, 336000, Yichun, China;Engineering Technology Research Center of Jiangxi Universities and Colleges for Selenium Agriculture, 336000, Yichun, China;Key Laboratory of Crop Growth and Development Regulation of Jiangxi Province, 336000, Yichun, China;College of Life Science and Environmental Resources, Yichun University, 336000, Yichun, China;Key Laboratory of Crop Growth and Development Regulation of Jiangxi Province, 336000, Yichun, China;

关键词: Adsorption;    Cadmium;    Cupriavidus necator;    Biosorbent;   

DOI  :  10.1186/s13065-023-00977-4

 received in 2022-12-29, accepted in 2023-05-30,  发布年份 2023

来源: Springer

【 摘 要 】

Biosorbents have been extensively studied for heavy metal adsorption due to their advantages of low cost and high efficiency. In the study, the living and non-living biomass of Cupriavidus necator GX_5 previously isolated were evaluated for their adsorption capacity and/or removal efficiency for Cd (II) through batch experiments, SEM and FT-IR investigations. The maximum removal efficiency rates for the live and dead biomass were 60.51% and 78.53%, respectively, at an optimum pH of 6, a dosage of 1 g/L and an initial Cd (II) concentration of 5 mg/L. The pseudo-second-order kinetic model was more suitable for fitting the experimental data, indicating that the rate-limiting step might be chemisorption. The Freundlich isotherm model fit better than the Langmuir isotherm model, implying that the adsorption process of both biosorbents was heterogeneous. FT-IR observation reflected that various functional groups were involved in Cd (II) adsorption: –OH, –NH, C=O, C–O and C–C groups for the living biomass and –OH, –NH, C–H, C = O, C–N and N–H groups for the dead biomass. Our results imply that non-living biosorbents have a higher capacity and stronger strength for absorbing Cd (II) than living biomass. Therefore, we suggest that dead GX_5 is a promising adsorbent and can be used in Cd (II)-contaminated environments.

【 授权许可】

CC BY   
© The Author(s) 2023

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