Chemical Engineering Department, Federal University of Santa Maria, UFSM, Roraima Avenue, 1000, Santa Maria, RS, 97105-900, Brazil.
Environ Sci Pollut Res Int. 2019 Oct;26(28):28548-28557. doi: 10.1007/s11356-018-3547-0. Epub 2018 Oct 28.
Chitin (Ch) and chitin nanowhiskers (ChNW) were prepared, characterized, and applied as adsorbent to remove crystal violet (CV) dye from aqueous solutions. Ch was obtained from shrimp wastes and submitted to acid hydrolysis in order to find ChNW. The increase in average pore size and the rod-like shape of ChNW were probably the main characteristics which contributed to the increase in adsorption potential, when compared with raw Ch. The adsorbent dosage considered more adequate was 5 g L, and the most suitable pH was 8.0. A pseudo-second-order model was adequate to represent the kinetic profile. Sips and Hill models were suitable to fit the equilibrium curves. The maximum adsorption capacity of CV on ChNW was 59.52 mg g, and the process was endothermic, favorable, and spontaneous. These findings indicated that ChNW have potential to be used as adsorbent in the treatment of colored wastewaters.
壳聚糖（Ch）和壳聚糖纳米纤维（ChNW）被制备、表征，并作为吸附剂应用于从水溶液中去除结晶紫（CV）染料。Ch 从虾废物中获得，并进行酸水解以寻找 ChNW。与原始 Ch 相比，平均孔径的增加和 ChNW 的棒状形状可能是导致吸附潜力增加的主要特征。考虑到更合适的吸附剂用量为 5 g/L，最适宜的 pH 值为 8.0。准二级模型足以表示动力学曲线。Sips 和 Hill 模型适合拟合平衡曲线。CV 在 ChNW 上的最大吸附容量为 59.52 mg/g，该过程是吸热的、有利的和自发的。这些发现表明，ChNW 有可能被用作处理有色废水的吸附剂。
