Abstract

A chemically crosslinked cellulose ester films (MCC-CAD-GA) based on cellulose (MCC), citric acid anhydride (CAD) and l-glutamic acid (l-GA) was successfully prepared via amidation for the adsorption of Cd²⁺, Co²⁺, Ni²⁺, Pb²⁺ and Cu²⁺ ions with lower concentration from water. The obtained composites were characterized by FTIR, XRD, elemental analysis and SEM. The results showed that the thermal stability and mechanical strength of MCC-CAD-GA films were enhanced. The adsorption parameters, such as temperature, contact time, adsorbent dose, pH, and initial metal ion concentration were optimized. The adsorption capability of the composite for heavy metal ions was substantially and synergistically improved by adding l-GA into MCC-CAD. The composite films could be recycled and exhibited constant adsorption ability for five successful runs. In addition, the adsorption behavior followed the pseudo-second order kinetic model, and the adsorption isotherms were well described by the Langmuir model. All the results suggested that the MCC-based composite films could be considered as a promising candidate for heavy metal ions treatment.

Graphic Abstract

A chemically crosslinked cellulose ester films based on cellulose (MCC), citric acid anhydride (CAD) and l-glutamic acid (l-GA) was successfully prepared via amidation for the adsorption of Cd²⁺, Co²⁺, Ni²⁺, Pb²⁺ and Cu²⁺ ions with lower concentration from water. The modified could be recycled and exhibited constant adsorption performance for five successful runs.

中文翻译：

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l-谷氨酸交联纤维素酯膜对重金属离子的吸附

摘要

通过酰胺化成功制备了基于纤维素（MCC），柠檬酸酐（CAD）和1-谷氨酸（1 -GA）的化学交联纤维素酯薄膜（MCC-CAD-GA），以吸附Cd 2 ⁺，Co ²⁺，Ni 2 ⁺，Pb ²⁺和Cu ²⁺水中离子浓度较低的离子。通过FTIR，XRD，元素分析和SEM对所得复合材料进行表征。结果表明，MCC-CAD-GA薄膜的热稳定性和机械强度得到提高。优化了吸附参数，例如温度，接触时间，吸附剂剂量，pH和初始金属离子浓度。通过添加l，复合材料对重金属离子的吸附能力得到了显着协同增效。-GA进入MCC-CAD。复合膜可以循环使用，并在五次成功运行中表现出恒定的吸附能力。另外，吸附行为遵循伪二级动力学模型，并且吸附等温线由Langmuir模型很好地描述。所有结果表明，基于MCC的复合膜可被视为重金属离子处理的有前途的候选者。

图形摘要

通过酰胺化成功制备了基于纤维素（MCC），柠檬酸酐（CAD）和1-谷氨酸（1- GA）的化学交联纤维素酯薄膜，用于吸附Cd 2 ⁺，Co 2 ⁺，Ni ²⁺，来自水中的Pb ²⁺和Cu ²⁺离子浓度较低。改性剂可以循环使用，并在五次成功运行中表现出恒定的吸附性能。