Abstract

Chitosan is one of the promising natural polymers with characteristics such as biodegradability, chemical inertness, biocompatibility, high mechanical strength, good film-forming properties, and low cost. In addition, chitosan is a nontoxic cellulose-like polyelectrolyte polymer hydrogel that is suitable for the fabrication of artificial muscles, as this material undergoes a large volume change in response to changes in pH, temperature, or solvent composition. Chitosan is used in a wide range of applications such as wastewater treatement and biosensors. However, in sensor applications, the poor electrical conductivity of hydrogels results in a poor response time and a high operational voltage limits its applicability in devices. Hence, composites have been attempted by incorporating a rigid conducting polymer (such as PANI) into a flexible matrix (such as chitosan) to combine the good processability of the matrix and the electrical conductivity of the conductive polymer. In the present study, the eco-friendly polymer/bio-polymer composite (polyaniline/chitosan) was used as adsorbent and was investigated for its ability to remove Erionyl Yellow from an aqueous solution. Scanning electron microscopy showed that the surface of the composite is rough with pleats, providing a good possibility for dye adsorption. Characterization of the composite was done by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The thermal properties of chitosan–polyaniline were studied by thermogravimetric and differentiel differential scanning calorimetry. Various experiments were carried out as a function of contact time, initial dye concentration (100 mg/L), and adsorbent dose. The equilibrium data were fitted to Langmuir, Freundlich and Tempkin isotherm models. The Langmuir model showed a satisfactory fit to the equilibrium adsorption data of the polyaniline/chitosan composite with an observed maximum dye adsorption of 854.70 mg/g.

中文翻译：

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交联壳聚糖-聚苯胺复合材料对阴离子染料的吸附

摘要

壳聚糖是具有前景的天然聚合物之一，其具有诸如生物降解性，化学惰性，生物相容性，高机械强度，良好的成膜性和低成本的特性。另外，壳聚糖是一种无毒的类似纤维素的聚电解质聚合物水凝胶，适用于制造人造肌肉，因为这种材料会随着pH，温度或溶剂组成的变化而发生较大的体积变化。壳聚糖可广泛用于废水处理和生物传感器等领域。然而，在传感器应用中，水凝胶的导电性差会导致响应时间差，而较高的工作电压会限制其在设备中的适用性。因此，已经尝试通过将刚性导电聚合物（例如PANI）掺入柔性基质（例如壳聚糖）中，以将基质的良好加工性能与导电聚合物的电导率相结合，来制成复合材料。在本研究中，将生态友好的聚合物/生物聚合物复合材料（聚苯胺/壳聚糖）用作吸附剂，并研究了其从水溶液中去除Erionyl Yellow的能力。扫描电子显微镜显示，复合材料的表面粗糙且有褶皱，为染料吸附提供了良好的可能性。通过傅立叶变换红外光谱，X射线衍射和扫描电子显微镜对复合材料进行表征。用热重和差示差示扫描量热法研究了壳聚糖-聚苯胺的热性能。根据接触时间，初始染料浓度（100 mg / L）和吸附剂剂量进行了各种实验。将平衡数据拟合到Langmuir，Freundlich和Tempkin等温线模型。Langmuir模型对聚苯胺/壳聚糖复合材料的平衡吸附数据显示出令人满意的拟合，观察到的最大染料吸附为854.70 mg / g。