Banana Trunk Fibers-Infused Acidified Chitosan-Based Biocomposite for Cadmium(II) Sorption

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

以香蕉树干纤维（BTF）为原料，经酸化壳聚糖（ACS）处理，制备了一种绿色生物复合材料（BTF-i-ACS）.采用傅立叶变换红外光谱（FT-IR）、热重分析（TGA）和扫描电镜（SEM）对生物复合材料进行了表征. 表征结果表明，BTF在ACS中被广泛固定化，没有任何化学作用. 该生物复合材料用于从水介质中去除Cd2+. 考察了pH值、接触时间和初始浓度对反应的影响. 在环境温度（27±1℃）下，选择120min和pH~6.50的接触时间去除Cd2+. Cd2+去除率为92.67%. 数据最符合拟二级动力学和Freundlich等温线模型，表明速率限制步骤可能是Cd2+和生物复合物之间的电子共享或转移的化学吸附.

Keywords:

• Banana trunk fibers
• biocomposite
• cadmium(II)
• chitosan
• sorption

关键词:

• 香蕉树干纤维
• 生物复合材料
• 镉（II）
• 壳聚糖吸附

Acknowledgments

The authors would like to acknowledge Universiti Sains Malaysia (USM) for providing financial support (grant no. 1001/PKIMIA/814124).

Conflict of Interest

The authors declare that they have no competing interests.