阳离子木屑纤维素的制备及其对水中2,4-二氯苯酚的吸附性能

Preparation of Cationic Sawdust Cellulose and Its Adsorption to 2,4-Dichlorophenol in Aqueous Solution

以3-氯-2-羟丙基三甲基氯化铵(CTA)为醚化剂,对木屑纤维素(MC)进行了改性,并对产物进行了表征.探讨了阳离子木屑纤维素用量、pH值、吸附温度、吸附时间等因素对水溶液中2,4-二氯苯酚(2,4-DCP)静态吸附效果的影响.结果表明,阳离子木屑纤维素的制备条件为:CTA/MC质量比2.0,反应时间2.0h,反应温度30℃,NaOH溶液浓度30%(ω).阳离子木屑纤维素对水溶液中2,4-DCP的最佳吸附条件为:pH8.0,吸附时间90min,吸附温度25℃.此条件下,处理100mL2,4-DCP溶液(50mg/L)的吸附率可达88.92%,吸附容量为1.482mg/g.木屑纤维素经改性后,对水中2,4-二氯苯酚存在化学吸附.

Sawdust cellulose was modified by 3-chloro-2-hydroxypropyl trimethyl ammonium chloride （CTA） as etherizing agent and the resulting products were characterized. The effects of amount of cation sawdust cellulose, pH, adsorption temperature and adsorption time on adsorption rate of 2,4-dichlorophenol （2,4-DCP） in aqueous solution were discussed. The results showed that the preparation conditions of cation sawdust cellulose were mass ratio of CTA/MC 2.0, reaction time 2.0 h, reaction temperature 30 ℃, and mass fraction of sodium hydroxide solution 30%. The optimum adsorption conditions for 2,4-DCP were pH 8.0, adsorption time 90 min, adsorption temperature 25℃. When 100 mL 2,4-DCP solution （50 mg/L） was treated at those optimum adsorption conditions, the adsorption rate could reach 88.92%, and the adsorption capacity 1.482 mg/g. After the sawdust cellulose was modified, the chemical adsorption existed in the adsorption process for 2,4-DCP in aqueous solution, and its adsorption capacity for 2,4-DCP in aqueous solutions was obviously improved.