Chitosan crosslinked with 3-aminopropyltriethoxysilane was coated on porous poly (L-lactic acid) nanofibrous membrane to remove dyes from wastewater in the present study. The adsorption capacity of the composite membrane for the removal of methylene blue and rhodamine B was comprehensively studied. Large porous framework provided a high surface area to effectively immobilize the cross-linked chitosan on nanofibrous membranes. Batch trials were performed to evaluate the adsorption behaviour of membranes with variable crosslinking ratio, pH, initial concentration, temperature and time. Moreover, the adsorbent membranes before and after adsorption were characterized using scanning electron microscopy, x-ray energy dispersive analysis, and Fourier transform infrared spectrophotometer. Under optimum parameters, the adsorbent showed the removal capacity of 86.43 and 82.37 mg/g for rhodamine B and methylene blue, respectively. Isothermal and kinetic experiments showed that Langmuir isotherm and pseudo second order kinetics correlated best with adsorption data. Finally, the mechanism of adsorption and reusability of membrane for five cycles was studied.

在本研究中，将与 3-氨基丙基三乙氧基硅烷交联的壳聚糖涂覆在多孔聚（L-乳酸）纳米纤维膜上以去除废水中的染料。综合研究了复合膜去除亚甲蓝和罗丹明B的吸附能力。大多孔框架提供了高表面积以有效地将交联壳聚糖固定在纳米纤维膜上。进行批量试验以评估具有可变交联比、pH、初始浓度、温度和时间的膜的吸附行为。此外，使用扫描电子显微镜、X 射线能量色散分析和傅里叶变换红外分光光度计对吸附前后的吸附膜进行了表征。在最佳参数下，吸附剂对罗丹明 B 和亚甲蓝的去除能力分别为 86.43 和 82.37 mg/g。等温和动力学实验表明朗缪尔等温线和伪二级动力学与吸附数据的相关性最好。最后，研究了膜的吸附机理和五次循环的可重复使用性。