Deep eutectic solvents (DESs) have achieved the rising attention of the scientific community because of their distinctive physicochemical properties and variety of applications. Herein, DES composed of choline chloride as hydrogen bond acceptor (HBA) and glycolic acid as hydrogen bond donor (HBD) was synthesized. Next, the prepared DES was examined as a functionalization agent for rice husk ash (RHA) to form a novel adsorbent (DES–RHA). To ensure the formation of DES and to recognize the modifications occurred due to the functionalization process, a comprehensive characterization study was performed using ¹HNMR, FTIR spectroscopy, TGA, XRD, FESEM, HR-TEM and BET surface area. Potential of the prepared DES–RHA was investigated for the uptake of ofloxacin (OFL) from an aqueous environment. The impact of relevant process parameters was evaluated under optimum conditions, and the data were examined applying various kinetic and isotherm models. As per the regression findings, adsorption kinetics data were well described by pseudo-second-order model, and the isotherm data were in good agreement with Langmuir, Temkin, RP and Freundlich isotherm models. Further, the adsorption procedure was endothermic and spontaneous. The high regeneration and adsorption capacity of DES–RHA than untreated RHA adds a promising approach to eliminate emerging pollutants present in effluent sites.

深共熔溶剂 (DES) 因其独特的物理化学性质和多种应用而受到科学界越来越多的关注。在此，合成了由氯化胆碱作为氢键受体 (HBA) 和乙醇酸作为氢键供体 (HBD)组成的 DES。接下来，研究了制备的 DES 作为稻壳灰 (RHA)的功能化剂以形成新型吸附剂 (DES-RHA)。为了确保 DES 的形成并识别由于功能化过程而发生的修饰，使用¹ HNMR、FTIR 光谱、 TGA进行了全面的表征研究、XRD、FESEM、HR-TEM 和 BET 表面积。研究了制备的 DES-RHA 从水性环境中吸收氧氟沙星 (OFL) 的潜力。在最佳条件下评估相关工艺参数的影响，并应用各种动力学和等温线模型检查数据。根据回归结果，吸附动力学数据由伪二级模型很好地描述，等温线数据与 Langmuir、Temkin、RP 和 Freundlich 等温线模型非常吻合。此外，吸附过程是吸热和自发的。与未经处理的 RHA 相比，DES-RHA 的高再生和吸附能力增加了一种有前途的方法来消除污水中存在的新污染物。