Abstract
Pseudomonas aeruginosa strain ANSC, a non-genetically modified bacterial strain isolated from soil was used to study and evaluate biosorption potentials for hexavalent chromium (Cr[VI]) from aqueous solution. Living, heat-killed, and permeabilised cells were all used and found to be capable of reducing and sorbing Cr(VI). The influences of initial Cr(VI) ion concentration (50-150 mg/L), contact time (2 h, 10 min intervals), pH (2-8), temperature (30-60℃) and biosorbent mass (1.0-5.0 g/l) were reported. Adsorption of Cr(VI) is highly pH- and temperature-dependent, and the results indicate that the optimum pH and temperature for removal were found to be 2 and 60℃ respectively. The hexavalent chromium biosorption equilibrium could be better described by Langmuir isotherm than it could by Freundlich isotherm. A comparison of kinetic models applied to the adsorption of Cr(VI) ions onto the biosorbents was evaluated for the pseudo first-order, pseudo second-order, and intra-particle diffusion kinetic models. Results show that the pseudo second-order kinetic model was evidenced to correlate better the experimental data. The rate of hexavalent chromium adsorption increased following permeabilisation of the outer and/or cytoplasmic membrane by surfactants such as Triton X100, Tween 80, toluene, sodium deoxycholate and sodium dodecyl sulphate. The adsorption process has been found endothermic, and thermodynamic parameters of Gibb's free energy (ΔG°), change in enthalpy (ΔH°) and change in entropy (ΔS°) were calculated. Pseudomonas aeruginosa strain ANSC evidenced an effective biosorbent for the removal of hexavalent chromium in aqueous form.
Highlights
Increasing industrialization and technological expansion, rapid urbanization, increased energy utilization and waste generation from domestic and industrial sources have ravaged the environment by discharge of industrial and domestic wastes laden with heavy metals
Adsorption of hexavalent chromium onto heat-killed biomass of isolate was investigated in a batch system
The kinetics of Cr(VI) adsorption onto dried biomass of Pseudomonas aeruginosa ANSC were determined with three different kinetic models i.e. Pseudo first, second-order and intra-particle diffusion models
Summary
Increasing industrialization and technological expansion, rapid urbanization, increased energy utilization and waste generation from domestic and industrial sources have ravaged the environment by discharge of industrial and domestic wastes laden with heavy metals. Biosorption, the process of attracting various chemical species by biomass (live or dead) through physicochemical mechanisms as adsorption or ion exchange, has presented a more efficient and Biosorption of Hexavalent Chromium by Pseudomonas aeruginosa Strain ANSC: Equilibria Isothermic, Kinetic and Thermodynamic Studies environmental-friendly technology to remediate heavy metals. In this current study, live, heat-killed and permeabilised cells of hexavalent chromium tolerant microbe were used to reduce and sorb Cr(VI) from aqueous solution. Influences of initial metal concentration of Cr(VI), contact time, pH, temperature and biosorbent dosage were evaluated while correlating the process equilibria adsorption isotherm, kinetics and thermodynamics
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