Ipomoea aquatica (IA) was investigated for its potential as a low-cost adsorbent to remove toxic methyl violet 2B (MV2B) dye in aqueous solutions. Optimising parameters such as the effects of contact time, medium pH and ionic strength (using NaCl, NaNO₃, KCl and KNO₃) were investigated. The results indicated that 150 min were sufficient for the adsorption to reach an equilibrium state and no adjustment of pH medium was necessary. Batch adsorption experiments such as adsorption isotherm, thermodynamics and kinetics were investigated and the experimental isotherm data were fitted to six isotherm models, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips, with the latter being the best-fit isotherm model showing maximum adsorption capacity (q_max) of 267.9 mg g⁻¹. Thermodynamics studies indicated adsorption of MV2B to be exothermic in nature, occurring spontaneously. The kinetics was best described by the pseudo-second-order model. Regeneration of IA pointed to its reusability, maintaining high adsorption capacity even up until Cycle 5 when treated with acid (HCl) and base (NaOH). Functional groups such as hydroxyl and amine groups which could be involved in the adsorption of MV2B were determined using FTIR spectroscopy, and the point of zero charge of IA was found to be at pH 6.81.

研究了大叶番薯（IA）作为低成本吸附剂的潜在潜力，该低成本吸附剂可去除水溶液中的有毒甲基紫2B（MV2B）染料。研究了优化参数，如接触时间，介质pH和离子强度的影响（使用NaCl，NaNO ₃，KCl和KNO ₃）。结果表明150分钟足以使吸附达到平衡状态，并且不需要调节pH介质。研究了批量吸附实验，如吸附等温线，热力学和动力学，并将实验等温线数据拟合到六个等温线模型，分别是Langmuir，Freundlich，Temkin，Dubinin-Radushkevich，Redlich-Peterson和Sips，其中最适合等温模型显示最大吸附容量（q _max）为267.9mg g ^-1。热力学研究表明，MV2B的吸附是自然发生的放热反应。动力学最好用拟二阶模型来描述。IA的再生指出了其可重复使用性，当用酸（HCl）和碱（NaOH）处理时，直至第5周期仍保持高吸附能力。使用FTIR光谱法确定了可能参与MV2B吸附的官能团，例如羟基和胺基，发现IA的零电荷点位于pH 6.81。