In this study, a novel and facile route for the synthesis of cyclodextrin-conjugated graphene oxide (CDs–GO) nanocomposites by esterification reaction in the presence of EDC/DMAP as catalyst, was developed. The formation of CDs–GO was successfully approved by FT-IR, SEM, TEM, TGA and BET analyses. Then competitive adsorption capacity of cadmium ion by CDs–GO composites and the impact of different empirical parameters like contact time, initial metal ion concentration, and initial pH on the adsorption process were studied. The results showed that β-CD–GO at pH 7 is suitable for removing Cd(II) with 90 % removal efficiency. Also, the adsorption capacity experiment at constant concentration of 50 ppm of Cd(II) showed that more than 50 % of Cd(II) ions could be adsorbed by γ-CD–GO reaching an equilibrium within 2 h. Therefore, the γ-CD–GO and α-CD–GO showed high adsorption capacity toward Cd²⁺ (222.22 mg/g) which were pointedly more than that of β-CD–GO (208.33 mg/g). Furthermore, adsorption kinetics, isotherm studies, and thermodynamic analyses were evaluated. The adsorption data exhibited excellent fit to the pseudo-second-order (R² > 0.99) and Freundlich isotherm models.

在这项研究中，开发了在EDC / DMAP作为催化剂存在下通过酯化反应合成环糊精-共轭氧化石墨烯（CDs-GO）纳米复合材料的新颖而简便的途径。CD-GO的形成已通过FT-IR，SEM，TEM，TGA和BET分析成功批准。然后研究了CDs-GO复合材料对镉离子的竞争吸附能力以及接触时间，初始金属离子浓度和初始pH等不同经验参数对吸附过程的影响。结果表明，在pH为7的条件下，β-CD-GO适合于以90％的去除率去除Cd（II）。同样，在浓度为50 ppm的Cd（II）恒定浓度下的吸附容量实验表明，γ-CD-GO可以在2 h内达到平衡，从而吸收了50％以上的Cd（II）离子。所以，²⁺（222.22 mg / g）明显高于β-CD-GO（208.33 mg / g）。此外，还评估了吸附动力学，等温线研究和热力学分析。吸附数据显示出非常适合拟二阶（R ²  > 0.99）和Freundlich等温模型。