Polycyclic aromatic hydrocarbons are carcinogenic organic pollutants that are produced primarily by daily industrial and personal activities. This work studies the use of an abundant seagrass powder (SG) as an adsorbent to remove the relatively highly soluble PAHs (i.e., Acenaphthylene (Ace), Phenanthrene (Phen), and Flouranthene (Flu)) from contaminated water. At an optimum dose of 2 g/L, Flu was found to have the highest removal efficiency of 90.54%, followed by Phen with a removal efficiency of 87.89% and Ace with an efficiency of 61.11%. Flu had a maximum adsorption capacity of 2.25 mg/g at an equilibrium time of 6 h, followed by Phen with q_e of 2.12 mg/g at an equilibrium time of 24 h, and finally Ace with q_e of 1.13 mg/g at an equilibrium time of 120 h. Linear and non-linear isotherm Langmuir, Freundlich, and Temkin models fit largely well with adsorption data for Flu, Phen, and Ace. This suggests that coexistence of heterogeneous adsorption mechanism. The kinetic data of all 3 PAHs were best described by the pseudo-second-order model. The adsorption of both Flu and Phen by SG was observed to be spontaneous with negative ΔG values. On the other hand, the adsorption of Ace was spontaneous only at a low temperature. The change of enthalpy (ΔH) for all the studied compounds was negative; therefore, their adsorption was found to be exothermic. Physisorption appeared to dominate the adsorption mechanism of Flu and Phen, with ΔH values of − 36.03 kJ/mol and − 36.65 kJ/mol respectively. However, Ace adsorption showed some presence of chemisorption, with ΔH values of − 114.43 kJ/mol.

多环芳烃是主要由日常工业和个人活动产生的致癌有机污染物。这项工作研究了使用丰富的海草粉 (SG) 作为吸附剂从受污染的水中去除相对高度溶解的 PAH（即苊 (Ace)、菲 (Phen) 和氟蒽 (Flu)）。在 2 g/L 的最佳剂量下，发现 Flu 的去除效率最高，为 90.54%，其次是 Phen，去除效率为 87.89%，Ace 为 61.11%。流感具有2.25最大吸附容量毫克/克在6小时的平衡时间，随后Phen的其中q _Ë的2.12毫克/克在24小时的平衡时间，最后王牌其中q _ë在 120 小时的平衡时间为 1.13 毫克/克。线性和非线性等温线 Langmuir、Freundlich 和 Temkin 模型非常适合 Flu、Phen 和 Ace 的吸附数据。这表明非均相吸附机制并存。所有 3 种多环芳烃的动力学数据最好由伪二级模型描述。观察到 SG 对 Flu 和 Phen 的吸附是自发的，ΔG 值为负。另一方面，Ace 的吸附仅在低温下是自发的。所有研究化合物的焓 (ΔH) 变化均为负值；因此，发现它们的吸附是放热的。物理吸附似乎主导了 Flu 和 Phen 的吸附机制，ΔH 值分别为 - 36.03 kJ/mol 和 - 36.65 kJ/mol。然而，Ace 吸附显示出一些化学吸附的存在，