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首页> 外文OA文献 >The Use Of Chemically Modified Chitosan With Succinic Anhydride In The Methylene Blue Adsorption [o Emprego De Quitosana Quimicamente Modificada Com Anidrido Succínico Na Adsorção De Azul De Metileno]
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The Use Of Chemically Modified Chitosan With Succinic Anhydride In The Methylene Blue Adsorption [o Emprego De Quitosana Quimicamente Modificada Com Anidrido Succínico Na Adsorção De Azul De Metileno]

机译：化学改性的壳聚糖与琥珀酸酐在亚甲基蓝的吸附中的应用[化学改性的壳聚糖与琥珀酸酐在亚甲基蓝的吸附中的应用]

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摘要

The adsorption capacity of α-chitosan and its modified form with succinic anhydride was compared with the traditional adsorbent active carbon by using the dye methylene blue, employed in the textile industry. The isotherms for both biopolymers were classified as SSA systems in the Giles model, more specifically in L class and subgroup 3. The dye concentration in the supernatant in the adsorption assay was determined through electronic spectroscopy. By calorimetric titration thermodynamic data of the interaction between methyene blue and the chemically modified chitosan at the solid/liquid interface were obtained. The enthalpy of the dye/chitosan interaction gave 2.47 ± 0.02 kJ mol-1 with an equilibrium constant of 7350 ± 10 and for the carbon/dye interaction this constant gave 5951 ± 8. The spontaneity of these adsorptions are reflected by the free Gibbs energies of -22.1 ± 0.4 and -21.5 ± 0.2 kJ mol-1, respectively, found for these systems. This new adsorbent derived from a natural polysaccharide is as efficient as activated carbon. However 97% of the bonded dye can be eluted by sodium chloride solution, while this same operation elutes only 42% from carbon. Chitosan is efficient in dye removal with the additional advantage of being cheap, non-toxic, biocompatible and biodegradable.
机译：通过使用纺织工业中使用的亚甲基蓝染料，将α-壳聚糖及其经琥珀酸酐改性的吸附能力与传统的吸附活性炭进行了比较。在Giles模型中，这两种生物聚合物的等温线均被归类为SSA系统，更具体地说是在L类和亚组3中。通过电子光谱测定吸附测定中上清液中的染料浓度。通过量热滴定法获得了在固体/液体界面处甲蓝与化学修饰的壳聚糖之间相互作用的热力学数据。染料/壳聚糖相互作用的焓为2.47±0.02 kJ mol-1，平衡常数为7350±10，对于碳/染料相互作用，该常数为5951±8。这些吸附的自发性由自由吉布斯能量反映这些系统的-22.1±0.4和-21.5±0.2 kJ mol-1分别为1。这种源自天然多糖的新型吸附剂与活性炭一样有效。但是，可以用氯化钠溶液洗脱97％的键合染料，而同一操作只能从碳中洗脱42％。壳聚糖可有效去除染料，并具有廉价，无毒，生物相容性和可生物降解的优点。

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