The aim of this investigation was the adsorption of the diclofenac sodium (DS) from aqueous solution using its adsorption onto esparto grass (EG) modified with cationic surfactants such as Dodecyltrimethylammonium bromide, Cetyltrimethylammonium bromide and Benzyldimethylhexadecyl ammonium chloride to get DEG, CEG and BEG, respectively. The potentiality of these modified EG for the DS adsorption was studied. Batch mode analyses were conducted and the results showed that the maximum adsorption loading (q_max) was 3.31 mg/g for DEF, 6.45 mg/g for CEG, and 10.30 mg/g for BEG. Based on the results of the isotherm models and the calculated error of each model, Langmuir isotherm model demonstrated the best agreement with the adsorption data. Kinetic studies showed that the data have the highest fitting to the pseudo-second-order model. Adsorption mechanism mainly involves electrostatic interactions, hydrophobic interactions and π–π interactions. Finally, the exhausted MEG_s can be regenerated by diluted NaOH solution and reused.

本研究的目的是利用十二烷基三甲基溴化铵、十六烷基三甲基溴化铵和苄基二甲基十六烷基氯化铵等阳离子表面活性剂改性的茅草(EG)来吸附水溶液中的双氯芬酸钠(DS)，得到DEG、CEG和BEG，分别。研究了这些改性 EG 的 DS 吸附潜力。进行批量模式分析，结果表明，DEF 的最大吸附量 ( q _max ) 为 3.31 mg/g，CEG 为 6.45 mg/g，BEG 为 10.30 mg/g。根据等温线模型的结果和每个模型的计算误差，Langmuir 等温线模型证明了与吸附数据的最佳一致性。动力学研究表明，数据与伪二阶模型的拟合程度最高。吸附机理主要涉及静电相互作用、疏水相互作用和π-π相互作用。最后，用完的MEG_可以通过稀NaOH溶液再生并重新使用。