羟基化改性棉纤维基吸附剂的制备与性能研究

Preparation and Property Study of Hydroxylation Modified Cotton Fiber Base Absorbent

探讨羟基化改性棉纤维基吸附剂的制备工艺及性能。以棉纤维为基材,通过环氧氯丙烷和高碘酸钠对棉纤维进行环氧化和双醛氧化,然后通过环氧氯丙烷作交联剂接枝β⁃环糊精,利用缩醛反应接枝端羟基超支化聚合物。通过对重金属离子的吸附试验,得出的较优制备工艺为环氧化温度40℃,高碘酸钠质量分数0.6%,双醛氧化时间3.5 h。以0.4 mol/L的HCl为解吸剂、质量分数5%的NaOH为再生剂时,解吸⁃再生效率较高。认为:改性棉纤维基吸附剂对重金属离子的吸附能力比棉纤维更高,通过HCl解吸与NaOH再生后仍具备较高的吸附效果。

Preparation process and property of hydroxylation modified cotton fiber base absorbent were discussed.Cotton Fibers were used as the base material.Epoxidation and dialdehyde oxidation were performed for the cotton fibers with epoxy chloropropane and sodium periodate.Then,epoxy chloropropane was used as cross-linking agent to graft β-cyclodextrin and aldolization was adopted to graft hydroxy end hyperbranched polymer.Through the adsorption experiment on heavy metal ion,the optimized preparation process was obtained as 40℃for oxidizing temperature,0.6%for sodium periodate mass fraction and 3.5 h for dialdehyde oxidation.When 0.4 mol/L HCl was used as desorption reagent and 5%NaOH mass fraction was used as regenerant,the desorption and regeneration efficiency were better.It is considered that the absorption capability of the modified cotton fiber base absorbent on heavy metal ion is higher than cotton fiber.Through desorption of HCl and regeneration of NaOH regenerant,the absorption effect is still quite high.