A linear bacterial β-1,3-glucan, curdlan, was functionalized by ethylenediamine tetraacetic dianhydride (EDTAD) to form a porous insoluble material (Curd-E) in this study. Various technics, including FTIR, solid state ¹³C NMR, XRD, TGA, and SEM, were combined to determine the chemical and microscopic structure of the resultant. It's suggested that EDTAD esterified and cross-linked C6-hydroxyl groups of curdlan molecules to form the porous Curd-E. Moreover, Curd-E showed high adsorption capacity on Cu²⁺ (224.97 mg/g, pH 6.0) and Zn²⁺ (255.64 mg/g, pH 4.5) in comparison with the biomaterial and mineral based adsorbents. Data also indicated that the site affinity of Curd-E for cations was in the order of chelation > coordination/complexation > ion exchange. Besides, 2-site Langmuir and 2-step Freundlich isotherms gave the best interpretation for Cu²⁺ adsorption and Zn²⁺ adsorption, respectively. Since the adsorption capacity maintained 91.8% ± 0.8% after five cycles of adsorption/desorption, it is believed that Curd-E is suitable for removal of divalent cations in wastewater as a novel candidate.

在这项研究中，通过乙二胺四乙酸二酐（EDTAD）对线型细菌β-1,3-葡聚糖葡聚糖进行功能化，以形成多孔的不溶物（Curd-E）。结合了多种技术，包括FTIR，固态¹³ C NMR，XRD，TGA和SEM，以确定所得产物的化学和微观结构。提示EDTAD将凝胶多糖分子的C6-羟基酯化并交联，形成了多孔的Curd-E。此外，Curd-E在Cu ²⁺（224.97 mg / g，pH 6.0）和Zn ²⁺上显示出高吸附能力。（255.64 mg / g，pH 4.5）与生物材料和矿物基吸附剂相比。数据还表明，Curd-E对阳离子的位点亲和力的顺序为螯合>配位/络合>离子交换。此外，两点Langmuir等温线和两步Freundlich等温线分别对Cu ²⁺吸附和Zn ²⁺吸附提供了最佳解释。由于在五个吸附/解吸循环后吸附能力保持了91.8％±0.8％，因此认为Curd-E适合作为新型候选物去除废水中的二价阳离子。