ABSTRACT

A green biocomposite (BTF-i-ACS) consisting of banana trunk fibers (BTF)-infused acidified chitosan (ACS) was prepared. The biocomposite was characterized by means of Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM). The results of characterization indicated that BTF are widely immobilized in ACS without any chemical interaction. The biocomposite was used for the removal of Cd²⁺ from aqueous media. The effect of pH, contact time and initial concentration was evaluated. Contact time of 120 min and pH ~ 6.50 were selected for the removal of Cd²⁺ at ambient temperature (27 ± 1 °C). The percentage removal of Cd²⁺ was found to be 92.67%. The data best fitted pseudo-second order kinetics and Freundlich isotherm model indicating that the rate-limiting step might be chemisorption involving sharing or transfer of electrons between Cd²⁺ and biocomposite.

摘要

制备了绿色生物复合材料（BTF-i-ACS），该复合材料由香蕉树干纤维（BTF）注入的酸化壳聚糖（ACS）组成。通过傅立叶变换红外光谱（FT-IR），热重分析（TGA）和扫描电子显微镜（SEM）对生物复合材料进行表征。表征结果表明，BTF被广泛固定在ACS中，没有任何化学相互作用。该生物复合物用于从水性介质中去除Cd ²⁺。评估了pH，接触时间和初始浓度的影响。选择接触时间为120分钟，pH值为6.50，以在环境温度（27±1°C）下去除Cd ²⁺。Cd ^2+的去除百分比被发现是92.67％。该数据最适合拟二阶动力学和Freundlich等温模型，表明限速步骤可能是化学吸附，涉及Cd ²⁺与生物复合物之间电子的共享或转移。