Abstract
Hydrophobically modified alginate/chitosan complexes were formed by addition of chitosan solution to hydrophobically modified alginate solution. The complexes were found able to selectively remove pollutant from aqueous solutions. The effects of various parameters on removal performance such as HM-alginate or chitosan concentrations and pH were evaluated. In particular, the selective recovery of a model hydrophobic pollutant, Sudan IV, in the presence of a hydrophilic dye, methylene blue, was presented. The process showed high efficiency and selectivity, with more than 80% of the hydrophobic dye and ca. 10% of the hydrophilic dye recovered under the best condition of 1.0mg/mL HM-alginate together with 3.0mg/mL chitosan at pH 3.8, and the HM-alginate/chitosan complexes could ultimately be separated, which thereby made this a sustainable process. The fully biodegradable HM-alginate/chitosan complexes can be employed and may substitute synthetic products in various fields, e.g., wastewater treatment, cosmetics, and agriculture, thereby rendering environmentally improved approaches.
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