G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences (ISC RAS), 1, Akademicheskaya St., Ivanovo, 153045, Russia.
G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences (ISC RAS), 1, Akademicheskaya St., Ivanovo, 153045, Russia.
Chemosphere. 2018 Dec;212:1155-1162. doi: 10.1016/j.chemosphere.2018.08.158. Epub 2018 Sep 1.
The synthesis, characterization and environmental application of chitosan based material stable in acidic media for adsorption of anionic dyes were investigated. The adsorption material is chitosan nanoparticles immobilized on a fibrous carrier (CPF). The choice of optimal conditions for the preparation of chitosan particles and their immobilization on a chemically activated polyethylene terephthalate (PET) fiber is justified. Immobilized nanoparticles showed high adsorption rates and dye binding capacity (300-1050 mg g) depending on the dye type. Anionic phthalocyanine dyes having different molecular sizes, different nature and number of anionic groups were used as model adsorbates. The experimental isotherm data and a linear correlation coefficients (r > 0.99) have shown that the dyes adsorption on CPF is best predicted by the Langmuir isotherm. The adsorption rate has been found to conform to pseudo-second-order kinetics with a good correlation (R > 0.99) with intra-particle diffusion as one of the rate determining steps. It has been is established that the sorption rate and the limiting sorption capacity decrease with the increment in the dye molecule size. The process of adsorption of the dyes on the CPF is pH-insensitive in the pH range of 2-8. The adsorption saturated CPF could be effectively regenerated by a simple alkaline washing.
研究了在酸性介质中稳定的壳聚糖基材料的合成、表征及其在阴离子染料吸附方面的环境应用。吸附材料为固定在纤维载体（CPF）上的壳聚糖纳米颗粒（CPF）。优化了壳聚糖颗粒的制备条件及其在化学活化的聚对苯二甲酸乙二醇酯（PET）纤维上的固定条件。固定化纳米颗粒表现出较高的吸附速率和染料结合能力（300-1050 mg g），具体取决于染料类型。选用具有不同分子大小、不同性质和不同数量阴离子基团的阴离子酞菁染料作为模型吸附剂。实验等温线数据和线性相关系数（r > 0.99）表明，CPF 上染料的吸附最适合用朗缪尔等温线来预测。吸附速率符合准二级动力学，与内扩散作为速率决定步骤之一具有很好的相关性（R > 0.99）。结果表明，随着染料分子尺寸的增加，吸附速率和最大吸附容量均减小。在 pH 值为 2-8 的范围内，CPF 对染料的吸附过程对 pH 值不敏感。吸附饱和的 CPF 可通过简单的碱性洗涤有效地再生。
