Abstract In this study, a novel carboxymethyl functionalized β-cyclodextrin-modified graphene oxide (CM-β-CD-GO) adsorbent was designed and fabricated. The CM-β-CD-GO was applied to remove methylene blue (MB) from aqueous solutions. The adsorption mechanism was discussed in detail through the study of pH effect, kinetics, and isotherm models. The adsorption of CM-β-CD-GO for MB displayed high removal rates at the pH range of 6.0–10.0, and the removal efficiency is over 90% within 20 minutes. The pseudo-second-order model could well describe the kinetic process of MB adsorption, and the adsorption was determined by the multi-step process. The maximum uptake capability of CM-β-CD-GO towards MB was 245.70 mg g-1 at 25℃according to Langmuir isotherm model. A possible adsorption mechanism that electrostatic attraction, π-π interaction, and host-guest supramolecular interactions supported MB adsorption was proposed. The adsorption capacity of CM-β-CD-GO showed no significant change after five cycles. The structure and morphology of CM-β-CD-GO were characterized by XPS, FT-IR, TGA, PXRD, AFM, SEM, zeta (ζ) potential determination, and Raman spectroscopy. This work provides valuable information for the design of novel adsorbents that specifically and efficiently adsorb cationic dyes contaminants.

中文翻译：

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制备羧甲基功能化β-环糊精修饰氧化石墨烯以有效去除亚甲蓝

摘要 本研究设计并制备了一种新型羧甲基功能化β-环糊精修饰氧化石墨烯（CM-β-CD-GO）吸附剂。CM-β-CD-GO 用于从水溶液中去除亚甲蓝 (MB)。通过对pH影响、动力学和等温线模型的研究，详细讨论了吸附机理。CM-β-CD-GO 对 MB 的吸附在 6.0-10.0 的 pH 范围内显示出高去除率，并且在 20 分钟内去除效率超过 90%。拟二级模型可以很好地描述MB吸附的动力学过程，吸附由多步过程决定。根据Langmuir等温线模型，CM-β-CD-GO在25℃下对MB的最大吸收能力为245.70 mg g-1。一种可能的吸附机制，即静电引力、π-π 相互作用、提出了支持 MB 吸附的主客体超分子相互作用。CM-β-CD-GO 的吸附容量在五次循环后没有显着变化。CM-β-CD-GO 的结构和形貌通过 XPS、FT-IR、TGA、PXRD、AFM、SEM、zeta (ζ) 电位测定和拉曼光谱表征。这项工作为设计能够特异性有效吸附阳离子染料污染物的新型吸附剂提供了有价值的信息。