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Title: Cadmium removal using waste residue generated after recovery of base metals from manganese nodules
Authors: Randhawa, N S
Das, N N
Jana, R K
Keywords: Adsorption;Cadmium;Chemisorption;Manganese nodules;Manganese nodules leach residue
Issue Date: Nov-2013
Publisher: NISCAIR-CSIR, India
Abstract: The laboratory scale investigations on Cd2+ removal characteristics of waste manganese leach residue (wMNR), generated by reduction roasting – ammonia leaching of manganese nodules have been studied. Adsorption studies show rapid kinetics of Cd2+ adsorption. About 90% of total Cd2+ adsorption occurs within 15 min contact time and equilibrium is attained within 30 min. The quantity of Cd2+ adsorption increases with increase in leached residue dose but decreases with increase in initial Cd2+ concentrations. The adsorption is found to be dependent on initial pH of Cd2+ solution, which increases with increase in initial pH of the solution. Adsorption data are satisfactory fitted to the Langmuir isotherms. The loading capacity of Cd2+on leached residue calculated from Langmuir data is 32.26 mg g-1 at pH 5.5 and 303 K, which improves to 38.17 mg g-1 at 323 K. Pseudo second-order kinetics is applicable for the Cd2+ adsorption. Thermodynamic studies indicate spontaneous (ΔG0= -3.88, -5.04 and -6.0 kJ mol-1 at 303, 313 and 323 K respectively) and endothermic (ΔH0= 28.3 kJ mol−1) nature of adsorption. The activation energy for Cd2+ adsorption onto wMNR is calculated to be 50.76 – 65.14 kJ mole-1, suggesting chemisorption type adsorbate-adsorbent interaction.
Page(s): 371-379
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.20(6) [November 2013]

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