25 research outputs found
Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram ( Cicer arientinum )
The potential to remove Cr (VI) from aqueous solutions through
biosorption using the husk of Bengal gram ( Cicer arientinum ), was
investigated in batch experiments. The results showed removal of 99.9%
of chromium in the 10 mgl-1 chromium solution, the biomass required at
saturation was 1 g mg-1. Kinetic experiments revealed that the dilute
chromium solutions reached equilibrium within 180 min. The biosorptive
capacity of the (bgh) was dependent on the pH of the chromium solution,
with pH 2 being optimal. The adsorption data fit well with the Langmuir
and Freundlich isotherm models. The adsorption capacity calculated from
the Langmuir isotherm was 91.64 mg Cr (VI)/g at pH 2. The adsorption
capacity increased with increase in agitation speed and an optimum was
achieved at 120 rpm. The biosorption of Cr (VI) was studied by Fourier
transform infrared spectroscopy (FTIR), which suggested that the
presence of Cr (VI) ions in the biomass affects the bands corresponding
to hydroxyl and carboxyl groups. Comprehensive characterisation of
parameters indicates bgh to be an excellent material for biosorption of
Cr (VI) to treat wastewaters containing low concentration of the metal
Pattern of ovarian activity in the Indian toad. Bufo melanostictus (Schn.)
Oogenesis in the toad is of continuous type occurring throughout the year. The prefollicular cells divide mitotically to increase their number, to surround the developing follicles. The vitellogenesis begins from periphery and progresses towards the centre. The theca and granulosa layers in the mature follicles cannot be clearly differentiated. Binuclear oocytes are rarely found.The ovarian cycle of the toad can be broadly classified into prespawning (April-May), spawning (June-August) and postspawning-cum-preparatory period (September-March). The classification is based on the seasonal changes in the gonadosomatic index, diameter of the largest oocytes and ovarian histology. The breeding activity of the toad coincides with the rainy months of monsoon
Biosorption of iron(III) from aqueous solutions using the husk of <i style="">Cicer arientinum</i>
122-127 Iron is a major pollutant released as a by-product during several industrial operations especially during acid mining of metal ores. In this paper, the use of Bengal gram husk (husk of channa dal, Cicer arientinum) in the biosorption of Fe(III) from aqueous solutions is discussed. Parameters like agitation time, adsorbent dosage and pH were studied at different Fe(III) concentrations. The adsorption data fit well with Langmuir and Freundlich isotherm models. The adsorption capacity (qmax) calculated from the Langmuir isotherm was 72.16 mg of Fe(III)/g of the biosorbent at an initial pH of 2.5. Desorption studies were performed at different concentrations of hydrochloric acid showing that quantitative recovery of the metal ion is possible. The infrared spectra of the biomass before and after treatment with Fe(III), revealed that hydroxyl, carboxyl and amide bonds are involved in the uptake of Fe(III) ions. </smarttagtype
Biosorption of chromium (VI) from aqueous solutions by the husk of Bengal gram (Cicer arientinum )
The potential to remove Cr (VI) from aqueous solutions through
biosorption using the husk of Bengal gram (Cicer arientinum ),
was investigated in batch experiments. The results showed removal of
99.9% of chromium in the 10 mgl-1 chromium solution, the biomass
required at saturation was 1 g mg-1. Kinetic experiments revealed that
the dilute chromium solutions reached equilibrium within 180 min. The
biosorptive capacity of the (bgh) was dependent on the pH of the
chromium solution, with pH 2 being optimal. The adsorption data fit
well with the Langmuir and Freundlich isotherm models. The adsorption
capacity calculated from the Langmuir isotherm was 91.64 mg Cr (VI)/g
at pH 2. The adsorption capacity increased with increase in agitation
speed and an optimum was achieved at 120 rpm. The biosorption of Cr
(VI) was studied by Fourier transform infrared spectroscopy (FTIR),
which suggested that the presence of Cr (VI) ions in the biomass
affects the bands corresponding to hydroxyl and carboxyl groups.
Comprehensive characterisation of parameters indicates bgh to be an
excellent material for biosorption of Cr (VI) to treat wastewaters
containing low concentration of the metal
Effect of cyproterone acetate & cyproterone acetate + ascorbic acid on pars distalis of the toad Bufo melanostictus
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