Abstract This study presents Ipomoea aquatica root (“kangkong” root or KR) as a plausible environmentally friendly adsorbent. This readily available adsorbent, after oven drying, demonstrates strong adsorption characteristics toward Auramine O (AO) dye exhibiting 2.0 h equilibration time and stable efficiency within a sufficiently broad range in both pH and ionic strength. Adsorption kinetics was best described by the pseudo second order and Elovich models, indicating that chemisorption of two reactive moieties could be involved. Application of the experimentally obtained adsorption equilibrium data to investigate the conformity among many adsorption isotherm models, namely Langmuir, Freundlich, Temkin, Redlich-Peterson and Sips, together with corresponding error analyses, identified that the Sips model be the best-fit model, leading to attractive maximum adsorption capacity of 455.74 mg g−1. Further, regeneration and reuse of the spent adsorbent would be possible with ~ 75% AO dye being adsorbed even at the 5th cycle, when using base treatment. Hence, the utilization of Ipomoea aquatica root as a low-cost, effective adsorbent in wastewater treatment could be possible.

中文翻译：

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Ipomoea Aquatica 根作为环保绿色吸附剂，可有效去除金胺 O 染料

摘要 本研究将番薯根（“kangkong”根或 KR）作为一种合理的环保吸附剂。这种容易获得的吸附剂在烘箱干燥后表现出对金胺 O (AO) 染料的强吸附特性，显示出 2.0 小时的平衡时间和在足够宽的 pH 值和离子强度范围内的稳定效率。吸附动力学最好由伪二级和 Elovich 模型描述，表明可能涉及两个反应部分的化学吸附。应用实验获得的吸附平衡数据来研究许多吸附等温线模型之间的一致性，即 Langmuir、Freundlich、Temkin、Redlich-Peterson 和 Sips，连同相应的误差分析，确定 Sips 模型是最佳拟合模型，导致有吸引力的最大吸附容量为 455.74 mg g-1。此外，当使用碱处理时，即使在第 5 次循环时也可以吸附约 75% 的 AO 染料，从而可以再生和再利用用过的吸附剂。因此，在废水处理中将番薯根用作低成本、有效的吸附剂是可能的。