壳聚糖微球的制备及其对酸性染料的吸附性能

以壳聚糖（CS）为原料、多聚磷酸钠（TPP）和环氧氯丙烷（ECH）为交联剂，采用滴加成球法制备得到改性壳聚糖微球。研究微球对模拟兰纳洒脱酱红B（ABB）和尼龙山黄N-3RL（NYN）两种酸性染料废水的吸附性能。在染料废水初始质量浓度为100 mg/L、体积为50 mL的条件下，微球对两种染料废水的最佳吸附条件：微球粒径为0.5 mm，加入量为20.0 mg，吸附时间为16 h，pH值为3，振荡速率为150 r/min，ABB废水温度为20℃，NYN废水温度为 30～50 ℃。在最佳的吸附条件下，微球对ABB和NYN的吸附与Freundlich方程和Langmuir方程均有很好的关联，最大吸附量分别达到714.29 mg/g和769.23 mg/g，比普通壳聚糖对两种染料的最大吸附量分别提高443.99 mg/g、102.53 mg/g。对吸附饱和后的壳聚糖微球，用0.01 mol/L的NaOH溶液进行解吸，再生率分别达到99.08%和99.35%，可以重复利用，节省脱色成本。

Preparation and adsorption properties of chitosan beads for acidic dyes

Chitosan beads were prepared by the dripping granulation method，using chitosan (CS) as the raw material，sodium tripolyphosphate (TPP) and epichlorohydrin (ECH) as the cross-linking reagent. The adsorption properties of the chitosan beads for two kinds of acidic dyes，acid bordeaux B(ABB) and nylosan yellow N-3RL(NYN) from water was investigated. Under the initial concentration of dye waste water 100 mg / L and volume 50 mL，the optimum adsorption conditions of chitosan beads for the two dye waste waters were obtained as follows：particle size of chitosan beads 0.5mm，dosage 20.0mg，contact time 16 h，pH value 3， temperature 20℃ for ABB，30—50℃ for NYN，oscillating rate 150r/min. Under the optimum adsorption conditions，the adsorption process of ABB and NYN fitted well with both Freundlich model and Langmuir model，and the maximum adsorption capacity for ABB and NYN were 714.29 mg/g and 769.23 mg/g respectively，which exceeded the maximum adsorption capacity by non-bead chitosan 443.99 mg/g，102.53 mg/g respectively. The saturated chitosan beads were desorbed by 0.01mol/L NaOH，the regeneration rate were 99.08%，99.35% for each dye，and the beads could be used repeatedly which would reduce the decoloration cost.