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Omid Moradi,Vinod Kumar Gupta,Shilpi Agarwal,Inderjeet Tyagi,Mohammad Asif,Abdel Salam Hamdy Makhlouf,Hamidreza Sadegh,Ramin Shahryari-ghoshekandi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Graphene (G) and Graphene oxide (GO) were employed in the present study for the removal of two toxiccationic dye Basic Red 12 (BR 12) and Basic Red 46 (BR 46), from aqueous solutions. Graphene oxide wassynthesized by Hummer–Offeman method, and then characterized by XRD (X-ray diffraction), and FT-IR(Fourier Transform Infrared spectroscopy). The influence of various physico-chemical parameters suchas electrical conductivity behaviors, contact time, solution pH, dye concentration and temperature werewell investigated and elucidated. The kinetics and thermodynamics of the toxic dye removal processwere also investigated; results clearly depicts that the kinetics of the removal of BR 12 and BR 46 using Gand GO as adsorbents follows a pseudo-second-order model. G and GO exhibited high-adsorptioncapacity for BR 12 and BR 46. The dye removal depends on the initial pH of the solution with themaximum uptake occurring at about pH 9. Moreover, the thermodynamic results confirmed thatadsorption of dye BR 46 on G and GO were exothermic and adsorption of dye BR 12 on G and GO wereendothermic in nature. The electrical conductivity behaviors of the aqueous solution were found to beenhanced by oxidation of graphene.
Vinod Kumar Gupta,Shilpi Agarwal,Inderjeet Tyagi,Maryam Sohrabi,Ali Fakhri,Sahar Rashidi,Nima Sadeghi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-
Carbon nanofibers have been synthesized by simple facile microwave-assisted hydrothermal route andapplied as adsorbent for the fast adsorption of methamphetamine. The topological property of CNF wasanalyzed using XRD, SEM, TEM, and nitrogen adsorption–desorption instrumental techniques. Thesignificance of the independent variables and their interactions were tested by the analysis of variance(ANOVA) and t-test statistics. Influential parameters are optimized using BBD implemented with RSM,and the optimized value of pH, adsorbent dose and temperature was found to be 8.0, 0.1 g and 298 K,respectively. Under optimal conditions, the removal efficiency of methamphetamine was found to be55.25 mg/g.
Sumanjit Kaur,Seema Rani,Vipin Kumar,R.K. Mahajan,Mohammad Asif,Inderjeet Tyagi,Vinod Kumar Gupta 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Mesoporous adsorbent is prepared first time using ferrocene based surfactant as a template and adsorption of azo dye Congo red is investigated. Adsorbent is characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, dynamic light scattering and N2 adsorption–desorption and deduced a lofty surface area of 342 m2/g. Effect of contact time, adsorbent dose, initial dye concentration and temperature were speculated to optimize adsorption conditions. Experimental data were contemplated for various kinetics and thermodynamic models at different temperatures and insinuated that adsorption process is film diffusion controlled and followed second order kinetics. Langmuir model imparted high value of monolayer capacity as 312.5 mg/g. The values of thermodynamic parameters like enthalpy (DH) and entropy (DS) were found to be 49.94 kJ/mol and 265.5 J/K/mol, respectively, and negative values of DG corroborated that the present adsorption system is feasible, spontaneous and endothermic.
Behzad Heibati,Ahmad B. Albadarin,Susana Rodriguez-Couto,Nurdan Gamze Turan,Okan Ozgonenel,M. Asif,Inderjeet Tyagi,Shilpi Agarwal,Vinod Kumar Gupta 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Rapid removal of the Acid Orange 7 (AO7) from aqueous solutions using natural pumice (NP) and Fecoatedpumice (Fe-CP) as low-cost adsorbents was well investigated and elucidated. The impact ofseveral influential parameters such as initial pH, initial AO7 concentration and contact time on theadsorption of AO7 removal was studied and optimized. The good agreement of adsorption equilibriumdata and analysis of isotherms with the Freundlich isotherm proved that it is the best fitted adsorptionisotherm model for the depicting the AO7 adsorption on both the developed adsorbents, which clearlyindicates the heterogeneity of the adsorbent surface. The maximum adsorption capacities for the NP andFe-CP were found to be 15.56 and 27.68 mg/g, respectively. The rate of adsorption followed the pseudosecond-order kinetic model.