title: Optimisation of radiolysis of Reactive Red 120 dye in aqueous solution using ionising (60)Co gamma radiation by response surface methodology.
abstract: In recent years, employing radiation technology is gaining great interest in degradation of industrial effluents. In this work the possibility of using gamma irradiation to degrade Reactive Red 120 (C.I.292775) was explored. The effects of pH, dose of gamma irradiation and concentration of dye were examined and their interaction were also established based on their response. For the analysis and optimisation of variables, three factor three level Box-Wilson face centred central composite design (CCF) was used. Analysis of variance with R(2) = 0.9988, adjusted R(2) = 0.9981 and the adequate precision value of 122.303 indicates that the CCF model can be used. The coefficient of variation (0.54%) indicates the reliability of the model. The dose of gamma irradiation (kGy) and the concentration of dye (mg/L) showed significant effects on the degradation of RR 120, while a difference of 6 to 10% degradation was observed in extending the pH towards the acid or alkali range from pH 7.00. The maximum concentration of dye degraded was observed as 347.509 mg/L at initial pH: 7.0, dose of gamma irradiation: 5.94 kGy and initial concentration of dye: 500 mg/L. This predicted value was found to be in agreement with the experimental value on the optimised conditions.
authors.affiliation: Center for Research, Department of Biotechnology, Kamaraj College of Engineering and Technology, Virudhunagar, Tamil Nadu, India.
authors.forename: V C
authors.initials: VC
authors.lastname: Padmanaban
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India E-mail: selvaraju@nitc.ac.in.
authors.forename: M S
authors.initials: MS
authors.lastname: Giri Nandagopal
authors.affiliation: Center for Research, Department of Biotechnology, Kamaraj College of Engineering and Technology, Virudhunagar, Tamil Nadu, India.
authors.forename: Anant
authors.initials: A
authors.lastname: Achary
authors.affiliation: Department of Livestock Products Technology, Kerala Veterinary and Animal Science University, Thrissur, Kerala, India.
authors.forename: V N
authors.initials: VN
authors.lastname: Vasudevan
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India E-mail: selvaraju@nitc.ac.in.
authors.forename: N
authors.initials: N
authors.lastname: Selvaraju
mesh_terms: D003037:Cobalt Radioisotopes / Q000737:chemistry*; D004396:Coloring Agents / Q000528:radiation effects*; D005720:Gamma Rays; D006863:Hydrogen-Ion Concentration; D014227:Triazines / Q000528:radiation effects*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000528:radiation effects*
chemical_list: D003037:Cobalt Radioisotopes; D004396:Coloring Agents; D014227:Triazines; D014874:Water Pollutants, Chemical; C042516:reactive red 120 dye