Equilibrium and kinetic modelling of cadmium (II) biosorption by Dried Biomass Aphanothece sp. from aqueous phase

International Conference on Biomass: Technology, Application, and Sustainable Development

生物科学;能源学;经济学

Awalina^1,2 ; Harimawan, A.^1 ; Haryani, G.S.^2 ; Setiadi, T.^1

Department of Chemical Engineering, Faculty of Industrial Technology, Bandung Institute of Technology, Jln. Ganesha No.10, Bandung, Indonesia^1

Research Center for Limnology, Indonesian Institute of Sciences, LIPI Cibinong Science Center, Cibinong-Bogor, Indonesia^2

关键词: Atmospheric carbon dioxide;    Biomass concentrations;    Biosorption capacity;    Ion concentrations;    Langmuir isotherm models;    Pseudo-second order model;    Sorption/Desorption;    Thermodynamic parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/65/1/012018/pdf
DOI  :  10.1088/1755-1315/65/1/012018

学科分类：生物科学（综合）

来源: IOP

【 摘 要 】

The Biosorption of cadmium (II) ions on dried biomass of Aphanothece sp.which previously grown in a photobioreactor system with atmospheric carbon dioxide fed input, was studied in a batch system with respect to initial pH, biomass concentration, contact time, and temperature. The biomass exhibited the highest cadmium (II) uptake capacity at 30°C, initial pH of 8.0±0.2 in 60 minute and initial cadmium (II) ion concentration of 7.76 mg/L. Maximum biosorption capacities were 16.47 mg/g, 54.95 mg/g and 119.05 mg/g at range of initial cadmium (II) 0.96-3.63 mg/L, 1.99-8.10 mg/L and 6.48-54.38 mg/L, respectively. Uptake kinetics follows the pseudo-second order model while equilibrium is best described by Langmuir isotherm model. Isotherms have been used to determine thermodynamic parameter process (free energy change, enthalpy change and entropy change). FTIR analysis of microalgae biomass revealed the presence of amino acids, carboxyl, hydroxyl, sulfhydryl and carbonyl groups, which are responsible for biosorption of metal ions. During repeated sorption/desorption cycles, the ratio of Cd (II) desorption to biosorption decreased from 81% (at first cycle) to only 27% (at the third cycle). Nevertheless, due to its higher biosorption capability than other adsorbent, Aphanothece sp appears to be a good biosorbent for removing metal Cd (II) ions from aqueous phase.