Affiliations: Institute of Environmental Science, Zhejiang
University, Hangzhou 310027, China | Department of Environment Science and Engineering,
Nanchang University, Nanchang 330029, China
Abstract: Reactive Red 195, which is an azoic anionic dye characterized by the
presence of five sulfonic groups and one azoic group, is efficiently removed
using chitosan. The increasing chitosan dose had a dramatic positive impact on
the achieved color removal, there was approximately a linear relationship
between chitosan dose and color removal of dye before color removal reach
maximum. Also, the increase of dye concentration led to the increase of
chitosan dosage in order to get the same color removal. 92 mg/L of chitosan
dosage was sufficient to achieve complete remove of dye at initial
concentration of dye at 200 mg/L. For the higher concentrations of dye, high
dosages were necessary to reach complete color removal. On the other hand, the
use of adsorption interferents (Fe^{2+},
Na^+, HCO_3^- and others) can be
interesting, addition of ions had effect on the color removal of Reactive Red
195. Comparing with blank, addition of chemical species approximately decreased
the color removal except Na^+ and combination of
Fe^{2+} + HCO_3^-. However, comparing
with Fe^{2+} alone and HCO_3^- alone,
combination of Fe^{2+} + HCO^-_3
increased the color removal.
Keywords: chitosan, Reactive Red 195, dye, coagulation, color removal
