Ceramic filter material was developed mainly with coal fly ash and used as an absorbent for Cr(VI) removal. This material was characterized through physico-chemical analysis with scanning electron microscope (SEM), energy dispersive X-ray spectrometry (EDS) and mercury porosimeter. Then static adsorption experiment was carried out to study adsorption characteristics of Cr(VI) on this filter material. SEM patterns indicated this material had enormous specific surface area and high porosity. EDS results showed this material was mainly composed of O, Si, C, Al, Mg, Fe, Ca and K in various compounds. Total pore area and porosity above 1.5 nm were 66.8 m2/g and 60.1% respectively. The main parameters affecting Cr(VI) adsorption were dosage and contact time. 200 g/l dosage of this filter material could remove more than 90% of Cr(VI) to solution with 20 mg/l initial concentration. Adsorption isotherm accorded with both Langmuir and Freundlich model. The study proved this ceramic filter material was a good adsorbent with high adsorption capacity to Cr(VI).
The adsorption technique using fly ash composite material has been applied for the removal of Cr(VI) from aqueous samples. Batch experiments have been carried out for the adsorption of Cr(VI) onto fly ash composite material. The effects of various process parameters, namely, pH, adsorbent dosage, initial Cr(VI) concentration and contact time has been studied in batch systems. Maximum metal removal ratio was observed at pH 5.0~5.5, and the sorption reaction was an endothermic process. The results revealed that the hexavalent chromium is considerably adsorbed on this adsorbent and it could be an economical method for the removal of hexavalent chromium from aqueous systems.
The large scale production of recombinant hemoglobin (Hb) from microorganism or transgenic hosts for Hb-based blood substitutes places utmost emphasis on purity. In the present study, a high-resolution, convenient and inexpensive purification method is developed for purification of Hb from mixtures containing E. coli extract and bovine serum. This method is based on affinity elution by pyrophosphate (PPi) of Hb adsorbed on an FPLC column of the anion exchanger Toyopearl DEAE-650M. Compared to pH elution or NaCl elution, PPi elution makes possible the preparation of Hb of much higher purity. A procedure combining pH elution and PPi elution sequentially using a single column proves particularly valuable. The purification method is also applicable to the purification of cyanomet-Hb (CNHb+).
Adsorption of Pb(II) on composite filter material mainly made of fly ash was investigated for the removal of Pb(II) from aqueous solution. Batch experiments have been carried out for adsorption of Pb(II) on to this composite filter material. The effects of various parameters influencing the Pb(II) adsorption such as contact time, initial pH, different dosage of adsorbent and temperature have been studied. Results showed that adsorption equilibrium attained within 60 minutes time. Increase in adsorbent dosage led to increase in Pb(II) adsorption due to increased number of adsorption sites. Adsorption process was found to be highly pH dependent, and the optimum pH range for adsorption of Pb(II) was found to be >8.5. The sorption of Pb(II) increased with rise of temperature.
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