靛红胭脂红在功能壳聚糖和β-环糊精/壳聚糖珠上的吸附：平衡、动力学和机理研究。
Adsorption of indigo carmine on functional chitosan and β-cyclodextrin/chitosan beads: Equilibrium, kinetics and mechanism studies.
机构信息
Laboratory of Food Chemistry and Technology, School of Chemical Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Polytechnioupoli, Zografou, 15780, Athens, Greece.
Laboratory of Food Chemistry and Technology, School of Chemical Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Polytechnioupoli, Zografou, 15780, Athens, Greece.
出版信息
J Environ Manage. 2020 May 15;262:110372. doi: 10.1016/j.jenvman.2020.110372. Epub 2020 Mar 6.
The present study was designed to produce novel cross-linked Chitosan and Chitosan/β-Cyclodextrin beads and study the adsorption of Indigo Carmine. Both adsorbents were characterized by SEM and FTIR techniques. Batch experiments were conducted in order to evaluate the effect of initial adsorbent's concentration, dye's initial concentration, initial pH and temperature. In all cases Chitosan/β-Cyclodextrin crosslinked beads exhibited higher removal efficiency of Indigo Carmine. Higher removal rates of Indigo Carmine were observed at low values of dye's initial concentration, pH and temperature, and high concentrations of adsorbent. The equilibrium adsorption data were a good fit for both Langmuir and Freundlich models and maximum adsorption capacity was 500.0 and 1000.0 mg/g for Chitosan and Chitosan/β-Cyclodextrin crosslinked beads, respectively. Adsorption of Indigo Carmine was found to follow the pseudo-second order. The negative values of ΔG, ΔH and ΔS indicate that the adsorption process is exothermic, spontaneous and favorable at low temperatures.
本研究旨在制备新型交联壳聚糖和壳聚糖/β-环糊精珠，并研究靛蓝胭脂红的吸附。两种吸附剂均通过 SEM 和 FTIR 技术进行了表征。进行了批量实验，以评估初始吸附剂浓度、染料初始浓度、初始 pH 值和温度的影响。在所有情况下，壳聚糖/β-环糊精交联珠对靛蓝胭脂红的去除效率更高。在较低的染料初始浓度、pH 值和温度以及较高的吸附剂浓度下，观察到靛蓝胭脂红的去除率较高。平衡吸附数据与 Langmuir 和 Freundlich 模型均拟合良好，壳聚糖和壳聚糖/β-环糊精交联珠的最大吸附容量分别为 500.0 和 1000.0 mg/g。靛蓝胭脂红的吸附符合准二级动力学模型。ΔG、ΔH 和 ΔS 的负值表明吸附过程是放热的、自发的，在低温下有利。
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