Studies on manganese-nodule leached residues; 1. Physicochemical characterization and its adsorption behavior toward Ni(2+) in aqueous system.
Physicochemical characterization of manganese-nodule leached residues was carried out by chemical analyses, XRD, TG-DTA, surface area measurement, and FTIR techniques. The material is very fine-grained (<75 microm), is cryptocrystalline to amorphous in nature, and contains mainly of delta-MnO(2), quartz (alpha-SiO(2)), and zeolite/feldspar minerals. Physically adsorbed sulfates in the leached residue are removed by repeated water washing and the washed sample shows an appreciable increase in surface area. This is indicated by the absence of 1387 and 1099 cm(-1) peaks in the IR spectrum of the washed sample. The adsorption behavior of the washed sample toward Ni(2+) was recorded as a function of time, pH, temperature, and concentrations of adsorbent and adsorbate.
Regional Research Laboratory, Bhubaneswar 751013, India. kmparida@rrlbhu.res.in
K M
KM
Parida
S
S
Mallick
B K
BK
Mohapatra
Vibhuti N
VN
Misra
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D008345:Manganese / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction / Q000379:methods
D014867:Water; D008345:Manganese; D009532:Nickel