Biosorption of zinc from aqueous solution by cyanobacterium Fischerella ambigua ISC67: optimization, kinetic, isotherm and thermodynamic studies

Abstract

In this present study, biosorption of Zn(II) from aqueous solution by cyanobacterium Fischerella ambigua was investigated in batch experiments. The effects of pH, bacterial dosage, initial Zn(II) concentration, contact time and temperature were studied. Removal process was influenced significantly by the variation of pH, biosorbent concentration, initial Zn(II) ion concentration, temperature and contact time. Optimum biosorption conditions were found to be initial pH of 5, bacterial dosage of 0.2 g/l and initial Zn(II) ion concentration of 175 mg/l at room temperature and contact time of 90 min. The maximum uptake capacity of F. ambigua for Zn(II) ions was found to be 98.03 mg/g at optimum conditions. The correlation coefficient for the second-order kinetic model was 0.995. The Freundlich isotherm model showed better fit to the equilibrium of the system, compared with the Langmuir model. Fourier transform infrared analysis of bacterial biomass revealed the presence of carboxyl, hydroxyl, sulfite and amino groups, which are likely responsible for the biosorption of Zn(II). The negative values of Gibbs free energy, ΔG°, confirm the spontaneous nature of the biosorption process. Finally, F. ambigua adsorption capacity was compared with other biosorbents. Results showed that F. ambigua was an efficient biosorbent in the removal of Zn(II) ions from an aqueous solution.

Structural Changes of Bacillus subtilis Biomass on Biosorption of Iron (II) from Aqueous Solutions: Isotherm and Kinetic Studies

“…The constants of Temkin isotherm suggest that the heat of sorption is a physical process. Various studies reported that either Freundlich (Safari and Ahmady-Asbchin 2018), Langmuir (Anuradha et al 2018) or Temkin (Aravind et al 2015) isotherm models are the best fit.…”

Binary biosorption of Cadmium(II) and Nickel(II) onto planococcus sp. isolated from wastewater: Kinetics, equilibrium and thermodynamic Studies

“…The effect of different items were determined as follow: pH (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), isotherm (single and binary 0.4-1.2 mg/l), temperature (5,20,45 and 60°C), initial concentration of bacterial biomass (0.5-3 g), contact time for defining desorption kinetic, live and dead bacterial biosorption, the effect of desorption agents (EDTA, CH 3 COOH,NaHCO 3 , HNO 3 ,CH 3 COOH ,HCl ,CaCl 2 ,KCl ,H 2 SO 4 ). To set pH, HCl 0.1M and HNO 3 0.1 M had been used.…”

“…In recent years, biological methods such as biosorption, bioaccumulation processes have been considered as novel, economic, efficient, and eco-friendly alternative treatment technologies for the removal of heavy metals from contaminated wastewaters generated from various industries. Biosorption, bioaccumulation and biodegradation have been already utilized by yeast, fungi, algae, bacterium, and cyanobacteria [8,9]. Among organisms and microorganisms, bacteria play an important role in removing toxic and heavy metals.…”

Agro waste material as ecofriendly adsorbent for the removal of Zn(II): isotherm, kinetic, thermodynamic and optimization studies

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