Use natural absorbent chitosan nanocomposite-tragacanth removal of metal chromium (VI)The aqueous solution

In this study, the chitosan nano composite - Gum naturally as the material for separation of Cr (VI) from aqueous solution was used. Initial experiments revealed that the percentage of deacetylation of chitosan used was 85%, The viscosity of the samples used in the cP 800 and a molecular weight of approximately 300,000, the moisture content of 1.2% and a density of 1.23 and viscosity Gum used against cP 3500, the density of 1.44, percent moisture, powder and on a par with the open environment of the by 5/11% and the ash left over from burning gum in normal atmospheric temperature ° C 600 of 45/3% respectively. After preparing the nano composite, the effect of the adsorption process parameters such as: pH, adsorbent dosage, concentration and temperature were absorbing. The results show that under optimum operating conditions, absorption of chromium by Nano composite chitosan-tragacanth time of 50 minutes and at pH = 6 and 8ppm concentration and adsorbent dosage of 0.2gr at 298k. The absorption at pH = 6 observed that chromium 6 indicate that metal ions showed better stability in this environment that the oxidation of these ions reduce or increase the pH number will change and the uptake of pollutants decreased with increasing temperature the findings show that poor physical connection between the absorber and is absorbing and engrossing way to recovery after pollution is absorbed. Absorption decreases with increasing concentration of pollutants, indicating a high concentration of ions of chromium 6 poisoning absorbent.

کلیدواژه ها:

Nano composite chitosan-tragacanth ، chromium ions 6 ، adsorption ، pH ، temperature