A new pollutant remover was prepared using Konjac glucomannan (KGM)-Acetate sol that was synthesized from KGM

acetic anhydride and auxiliary additives

and coated on the surface of lacquered metal polluted by Cr3+. The additives can make decontamination film fall automatically off after decontaminating. The influence of the synthesis conditions on rate of Cr3+ pollutant removal

that of KGM-Acetate sol concentration and film-forming temperature on film-forming time as well as that of various auxiliary additives on filmtearing strength were studied. FTIR

EDX and XPS were used to analyze the mechanism of Cr3+ pollutant removal. It is found that the time of film formation is the shortest 87 min at temperature 40℃ and pollutant removal concentration 4.7%. The experiment results show that at the condition of KGM 5 g

acetic anhydride 40 ml

reaction temperature 60℃and time 150 min

and volume of additive (sulfuric acid) 3 ml

the film-forming agent obtained KGM-Acetate sol has the maximum decontamination rate 99.2%. The removal of Cr3+ pollutant is likely to be attributed mainly by complexation interaction between Cr3+ and carbonyl oxygen in KGM-Acetate as well as physical adsorption. The tearing strength is the least for formulation of additive promoters citric acid 4 g:EDTA 6 g:sodium dodecylbenzenesulfonate 1 g:distilled water 89 g.