羧甲基壳聚糖微球对活性艳红X-3B的吸附行为研究

用交联的壳聚糖微球(CTS)与氯乙酸在碱性条件下反应,合成了羧甲基壳聚糖树脂(CMCT)。其吸附染料活性艳红X-3B的实验结果表明,CMCT和CTS均对偶氮染料活性艳红X-3B有较好的去除能力。实验条件下,最大平衡吸附量分别为611.5mg/g和365.2mg/g,说明羧甲基的引入提高了壳聚糖的吸附能力。等温吸附可以用Langmuir方程较好的描述,表明为单分子层吸附。动力学过程用二级吸附动力学模拟具有很好的线性相关性,通过二级吸附模型计算出的平衡吸附量与实验值相符。流动床实验表明,CMCT和CTS对浓度为100mg/L的X-3B溶液吸附的穿透点分别为6000ml/g和3375ml/g,用0.1mol/L的氢氧化钠溶液洗脱,洗脱峰集中,洗脱率都在90%以上。洗脱再生后的CMCT和CTS树脂均可重复使用。

STUDY ON ADSORPTION PROPERTIES FOR REACTIVE BRILLIANT RED X-3B OF CROSSLINKED CARBOXYMETHYL CHITOSAN RESIN

Crosslinked carboxymethyl chitosan resin (CMCT) was prepared by reacting chitosan microsphere (CTS) with chloroactic acid in basic condition and used to treat simulative water containing reactive dye X-3B. The results showed that CTS and CMCT both have good sorption properties and the maximum equilibrium capability was 611.5mg/g and 365.2mg/g, respectively. Moreover, CMCT has a wider pH application range than chitosan and the adsorption uptake is also improved. It was shown that equilibrium isotherms could be well fitted by the Langmuir equation, a pseudo-second-order equation was used to interpret the kinetics course and the correlation is good. Qe value calculated from the equation matched well with the experiment result. The breakthrough point get by a column method was 6000ml/g and 3375ml/g for CMCT and CTS at initial concentration of 500mg/L, respectively. The resins were regenerated by 0.1mol/L alkali solution and can be used repeatedly.