Abstract: 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.

Key words: KGM, esterification, membranes, Cr³⁺ pollutant, adsorption, automatically shedding film

摘要： 以魔芋葡甘聚糖（KGM）和乙酸酐为原料，合成了魔芋葡甘聚糖醋酸酯（KGM-Acetate）溶胶，辅以助剂制备一种新型去污剂，涂布于被Cr³⁺污染的镀漆钢板表面，成膜去污后，去污膜实现自脱落。综合考察了KGM-Acetate合成条件对Cr³⁺去污率、KGM-Acetate溶胶浓度和成膜温度对成膜时间以及不同配方助剂的添加对去污膜的剥离强度的影响，并运用FTIR、EDX及XPS等分析手段对去污机理进行了分析。结果表明：当反应温度为60℃，反应时间为150 min，催化剂浓硫酸的用量为3 ml，酯化剂醋酸酐为40 ml（KGM为5 g）时合成的KGM-Acetate溶胶成膜剂对Cr³⁺去污率最高，达到99.2%。KGM-Acetate对Cr³⁺的去除可能主要是KGM-Acetate与Cr³⁺配位作用和物理吸附作用的结果。当KGM-Acetate溶胶浓度为4.7%、成膜温度为40℃时成膜时间最短为87 min；助剂配方为柠檬酸：十二烷基苯磺酸钠（SDBS）：乙二胺四乙酸钠（EDTA）：水为4：6：1：89时去污膜剥离强度最小，实现自脱落。

关键词: 魔芋葡甘聚糖, 酯化, 膜, Cr³⁺污染, 吸附（作用）, 自脱落膜