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Malay Kumar Ghosh,Gérrard Eddy Jai Poinern,Touma B. Issa,Pritam Singh 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.1
Goethite nanoparticles synthesized using hydrazine sulfate as a modifying agent were evaluated for As(V)adsorption capacity. The nanoparticles were characterized for their morphological and structural features. The precipitated goethite particles were spherical with particle size of less than 10 nm. Batch adsorption study was carried out systematically varying parameters such as pH, contact time, initial As(V) concentration and adsorbent doses. The Langmuir isotherm represented the equilibrium data well and the estimated monolayer adsorption capacity at ambient temperature was 76 mg/g, which is significantly higher than most of the adsorbents reported in the literature. Adsorption kinetic data were better represented by the pseudo-second order kinetic model. Intra-particle diffusion played a significant role in the rate controlling process in the initial hour. Desorption study showed that the loaded adsorbent could be regenerated when treated with dilute sodium hydroxide solution of pH 13.
Aqueous processing of nickel spent catalyst for a value added product
Abdul Rauf Sheik,Malay Kumar Ghosh,Kali Sanjay,Tondepu Subbaiah,Barada Kanta Mishra,Abdullahi Aalafara Baba 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Nickel was recovered from a fertilizer industry spent catalyst by leaching with nitric acid followed by nickel hydroxide precipitation. The optimization of temperature, initial acid concentration and particle size for leaching of the spent catalyst was done through 23 factorial design. A maximum extraction of 91.9% was achieved at 90 oC, 1.5M HNO3 and 62.5 μm particle size. Temperature and acid concentration showed positive effect, while particle size showed no effect. A regression equation was developed and employed to predict conditions for 100% extraction which were experimentally tested. Nickel hydroxide was electrochemically precipitated from the leach liquor and its maximum discharge capacity was found to be 155 mAh/g. A 3-stage counter current leaching circuit was designed to obtain a leach liquor of suitable pH. XRD characterization of the precipitated Ni(OH)2 shows to consist of both α- and β-forms.