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Nazaret Hidalgo,Giulia Mangiameli,Teresa Manzano,Galina G. Zhadan,John F. Kennedy,Valery L. Shnyrov,Manuel G. Roig 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.4
The degradation and removal of a series of dyes used in the textile industry for polyester/wool (PES/WO) blends and present in effluents, such as Green, Ash-Grey, Black, Navy Blue, Red and Yellow Domalan, and Orange and Red Bemacid, by catalytic action, in the presence of H_2O_2, of extracts of a novel peroxidase from postharvest lentil stubble was investigated. The extracts of this peroxidase (LSP) were effective in degrading these lastgeneration textile dyes, especially Green Domalan, Orange Bemacid, Grey and Black Domalan. A sensitivity study was carried out for Green Domalan biodegradation to determine the effects of process parameters such as pH,H_2O_2, enzyme and dye concentrations, contact and centrifugation times, and temperature. Standard ecotoxicity studies performed with Vibrio fischeri revealed that the dye solutions treated with peroxidase and H_2O_2 were less ecotoxic than the untreated ones.
Fernando I. Ramírez-Paredes,Teresa Manzano-Muñoz,Juan C. Garcia-Prieto,Galina G. Zhadan,Valery L. Shnyrov,John F. Kennedy,Manuel G. Roig 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.6
A biosorption process has been developed for the bioremediation of heavy metal-contaminated acid drainages from Merladet and Faith open-cast mines,located in western Spain. The process is based on the physico-chemical properties for the adsorption, ion exchange, and complexation of metal ions by biopolymers (chitin and α (1,3) β-D-glucan) from industrial biowaste exhausted brewer's yeast (Saccharomyces cerevisiae L.). Firstly, the chemical composition (U, Mn, Al, Fe, Cu, Zn,and Ni) and the physico-chemical and ecological states of these acid mine drainages were characterised. Furthermore,the selectivity for Zn, Cu, Mn, Ni, and Al the first order kinetics and the performance of the metals biosorption process by exhausted brewer's yeast were evaluated with polluted acid synthetic waters and mine drainages. The biosorption equilibria were reached in 10 ~ 15 min following Langmuir type isotherms with higher affinity constants for metal-biosorbent binding for synthetic waters than for acid mine drainages. The efficiency of the process with real water samples was markedly lower for the case of Mn, and zero for Zn and Al. An antagonistic interference on the biosorption of a metal due to the presence of other metals is proposed. Finally, the ecotoxicity of the acid mine drainage was removed when it was incubated with brewer’s yeast trapped in polyurethane foam.
T. Adinaveen,L. John Kennedy,J. Judith Vijaya,G. Sekaran 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Activated carbon composite was prepared from sugarcane bagasse. The X-ray diffraction revealed the evolution of crystallites of carbon and silica during activation at higher temperature. FTIR spectrum shows the presence of functional groups and silica in the carbon composite. The morphology of the carbon sample was determined by SEM. The surface area, pore volume and pore size distribution of carbon composites were measured. The dc conductivity was determined and conductivity at room temperature was found to increase from 10.22 x10-3 to 25.131 x 10-3 S cm-1. The samples show good electrochemical property and the specific capacitance in the range of 92–340 F g-1.
A. Manikandan,J. Judith Vijaya,J. Arul Mary,L. John Kennedy,A. Dinesh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Iron oxide (Fe3O4) nanoparticles were synthesized by a facile microwave combustion method. X-ray diffraction and energy dispersive X-ray spectroscopy results showed that the as-prepared product was pure Fe3O4 without any impurity. The mechanism for the formation of Fe3O4 by microwave combustion method is also discussed. Microwave combustion produced sufficient energy for the formation of Fe3O4, because of its homogeneous distribution within the raw materials. This results in the formation of nanoparticles, early phase formation and different morphologies within few minutes. Magnetic analysis revealed that the Fe3O4 nanoparticles had ferromagnetic behavior at room temperature with saturation magnetization of 66.12 emu/g.