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Removal of Mn(II) from aqueous solution by Irvingia gabonensis immobilized Aspergillus sp. TU-GM14: Isothermal, kinetics and thermodynamic studies

Journal of Environment & Biotechnology Research, Vol. 3, No. 1, Pages 1-11, April 2016

Adeogun A Idowu, Omeike Sunday, Kareem Sarafadeen Olateju


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ABSTRACT

Irvingia gabonensis immobilized Aspergillus sp. TU-GM14 was used for the removal of Mn2+ from aqueous solution in batch system. Effect of biosorption variables such as pH, adsorbent dosage, contact time and initial metal ion concentration were investigated. Experimental data obtained from batch equilibrium studies were subjected to two-parameter (Freundlich, Langmuir, Tempkin and Dubinin-Radushkevich (D-R)) and three-parameter (Redlich-Peterson (R-P), Sips, Koble-Corrigan and Toth) isotherm models. The experimental data were fitted to the isotherms with R2 > 0.9. The biosorption energy (E) from the D-R isotherm was found to be 0.13 kJ/mol, which indicates physisorption favoured process. Kinetic data were analysed with nth-order, modified second-order, Avrami and Elovich kinetic models. Both nth and modified second-order kinetic models best fitted the data with coefficient of determination (R2) above 0.9
99 along with average relative and hybrid errors lower than 5%. Intraparticle diffusion model analysis showed that the biosorption process occurs in two stages as rapid and slow phases. The calculated thermodynamics parameters (ΔGo,ΔHo and ΔSo) indicated that the process is spontaneous and endothermic in nature.
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Facile green synthesis of carbon nanoparticles using medicinally potent Pongamia pinnata shoots

Journal of Environment & Biotechnology Research, Vol. 3, No. 1, Pages 12-16, April 2016

B.S. Naveen Prasad, T.V.N. Padmesh, K.S. Uma Suganya, K. Govindaraju, V. Ganesh Kumar

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ABSTRACT

The emergence of carbon nanoparticles (CNPs) has received greater potential in biological labeling, bioimaging and other different optoelectronic device applications. Preparation of CNPs using Pongamia pinnata shoots in the presence of castrol oil is reported in the present study. The structural and optical properties of CNPs were studied using X-Ray diffraction (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscope (FE-SEM) and Energy Dispersive X-Ray (EDAX) analysis.
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Substrate inhibition kinetics: Naphthalene degradation by Pseudomonas putida

Journal of Environment & Biotechnology Research, Vol. 3, No. 1, Pages 17-23, April 2016

J. Jegan, G.R. Jeya Shankar, T. Bhagavathi Pushpa

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ABSTRACT

Biodegradation of naphthalene by Pseudomonas putida was studied in this article. The influence of pH, glucose concentration and inoculum concentrations on the growth and subsequent naphthalene degradation potential of P. putida were investigated. The naphthalene degradation and microbial growth was higher at optimum pH (pH 7), glucose concentration (500 mg/L) and inoculum concentration (3%). The non-ionic surfactants were used in the case of very high concentrations of naphthalene (500-2500 mg/L) to investigate the maximum naphthalene tolerance potential of P. putida. The surfactants used were Triton X-100 and Tween-80. These surfactants enhanced the availability of naphthalene to the microbes. Results indicated that naphthalene was completely degraded by P. putida at an initial naphthalene concentration of 500 mg/L. Further increase in naphthalene concentration decreases the degradation potential of P. putida. The inhibition characteristics of substrate were described using four kinetics models (Haldane, Webb, Edward and Aiba). These kinetics models fitted very well and effectively describe the dynamic behavior of naphthalene biodegradation by P. putida.
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Adsorptive removal of phenol by thermally modified activated carbon: Equilibrium, kinetics and thermodynamics

Journal of Environment & Biotechnology Research, Vol. 3, No. 1, Pages 24-34, April 2016

D. Kavitha


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ABSTRACT

The purpose of this study was to remove phenol from aqueous solution using carbonized coir pith in batch mode technique. Batch adsorption studies were conducted to evaluate the effect of various parameters such as pH, contact time, concentration of phenol, adsorbent dose and temperature. The carbonized coir pith showed high surface area and best adsorption capacity. Lagergren first-order, second-order, Bangham’s and intra particle diffusion model were used to fit the experimental data. Results of the kinetic studies show that the adsorption reaction is second order kinetic model with respect to phenol solution concentrations. The equilibrium time was obtained as 80 and 100 min for 10 and 20 mg/L and 120 min for 30 and 40 mg/L phenol concentrations. The adsorption equilibrium data obeyed the Langmuir, Freundlich, Dubinin-Radushkevich, and Tempkin isotherms. The adsorption capacity was found to be 48.31 mg/g, according to the Langmuir isotherm. Acidic pH was favorable for the adsorption of phenol. Studies on pH effect and desorption revealed that chemisorption was involved in the adsorption process. T
he change in entropy (ΔS0) and heat of adsorption (ΔH0) of coir pith carbon were determined as 85.76 J/mol/K and 24.99 kJ/mol, respectively. The negative value of change in Gibbs free energy indicates a feasible and spontaneous adsorption of phenol on coir pith carbon.
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Biowaste recycling by microbes for hydrogen production - An alternative strategy for greener fuel

Journal of Environment & Biotechnology Research, Vol. 3, No. 1, Pages 35-41, April 2016

Shanmugam Sabarathinam, Savitha Sivasubramanian, Krishnasami Swaminathan, Sadhasivam Subramaniam


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ABSTRACT

The need for cleaner and greener fuel is highly desirable in near future, since fossil fuels are the known and leading cause for the environmental and health hazards like global warming and airborne toxicants. Thus far, biological processes have been engaged to produce hydrogen from biomass to replace fossil fuel economy. Development of such renewable energy technologies are considered as viable alternates to produce hydrogen using the organic substrates. However, the high cost of raw materials, problems associated with the bioconversion of lignocellulosic waste and lower hydrogen yield are several constraints behind the biohydrogen production. This review is focused on the different bioprocess methods involved in the hydrogen production, solid waste recycling with a special attention towards anaerobic bacteria mediated dark fermentation. Finally, the potential application of biohydrogen and challenges associated with its production are discussed.
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Previous Issue
Journal of Environment and Biotechnology Research
Volume 3, Number 1, Pages 1-41 (April 2016)

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