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采用预处理和柠檬酸酯化反应2个阶段的处理方法对竹纤维进行修饰改性,考察了预处理溶液浓度、预处理时间、柠檬酸用量比、催化剂用量比、热反应时间,热反应温度对改性效果的影响,并测定了改性后竹纤维材料对重金属Ni~(2+)的吸附性能。实验结果表明,当预处理溶液浓度取5%,预处理时间控制在180 min,柠檬酸用量比取20 mmol·g~(-1),催化剂次磷酸钠用量比取0.4,热反应时间控制在90 min,热反应温度为120℃时,改性效果达到最佳,得到的最高羧基团含量为3.373 mmol·g~(-1)。改性后的竹纤维材料对Ni~(2+)的吸附容量高达9.486 mg·g~(-1),相比未改性的竹纤维,吸附性能上有显著提升。
The bamboo fiber was modified and modified by two stages of pretreatment and citrate esterification. The effects of pretreatment solution concentration, pretreatment time, citric acid dosage ratio, catalyst dosage ratio, thermal reaction time, thermal reaction temperature On the effect of modification, and the determination of the modified bamboo fiber material on the adsorption properties of heavy metal Ni ~ (2+). The results showed that when the concentration of pretreatment solution was 5%, the pretreatment time was controlled at 180 min, the amount of citric acid was 20 mmol · g ~ (-1) and the amount of sodium hypophosphite was 0.4, the reaction time was controlled at 90 min and the thermal reaction temperature was 120 ℃, the best modification effect was achieved. The highest carboxyl content was 3.373 mmol · g -1. The modified bamboo fiber material has an adsorption capacity of Ni 2+ of 9.486 mg · g -1. Compared with the unmodified bamboo fiber, the adsorption capacity of the modified bamboo fiber significantly increases.