Department of Public Health, Chung-Shan Medical University, Taichung, 402, Taiwan; Department of Family and Community Medicine, Chung Shan Medical University Hospital, Taichung, 402, Taiwan.
Department of Public Health, Chung-Shan Medical University, Taichung, 402, Taiwan.
Chemosphere. 2022 Feb;288(Pt 3):132619. doi: 10.1016/j.chemosphere.2021.132619. Epub 2021 Oct 19.
Untreated wastewater containing fluoroquinolone antibiotics poses serious hazards to aquatic species and human health; therefore, treatment of waste expanded polystyrene (EPS) is a crucial environmental matter. In this study, waste EPS was modified with a HSO/biodegradable chelating agent, [S,S]-ethylenediamine-N,N'-disuccinic acid (EDDS), and used for highly efficient adsorption of the fluoroquinolone antibiotic ciprofloxacin. When ciprofloxacin of 25 mg/L was used, the HSO-modified EPS (EPS) adsorbed 60.5% of the ciprofloxacin. During sulfonation, adding a low dose of EDDS markedly improved the adsorption ability of EPS The optimal modification conditions were 95% HSO, 0.002 M EDDS, 80 °C, and 40 min. The increased adsorbent doses enhanced the adsorption. Approximately 0.2 g/L of EPS could effectively adsorb 97.8% of the ciprofloxacin (554.3 mg/g) within 30 min. Solution pH greatly influenced the adsorption, and the most suitable pH was 6. The Langmuir isotherm accurately described the adsorption behaviors of both EPS and EPS (R = 0.997-0.998). The adsorption ability of EPS (q = 1250 mg/g) was 32 times higher than that of EPS (q = 38.6 mg/g). A total of 1 M HCl effectively regenerated the exhausted adsorbent. The optimal solid/liquid ratio and time were 0.08 g/20 mL and 60 min, respectively. The regenerated EPS maintained a high adsorption ability (87.2%) after 10 regeneration cycles. The results thus indicate that the EPS adsorption-regeneration process is a potential approach to remove ciprofloxacin from water.
未经处理的含氟喹诺酮类抗生素废水对水生生物和人类健康构成严重危害；因此，处理废膨胀聚苯乙烯 (EPS) 是一个至关重要的环境问题。在本研究中，用 HSO/可生物降解螯合剂[S,S]-乙二胺-N,N'-二琥珀酸 (EDDS) 对废 EPS 进行改性，用于高效吸附氟喹诺酮类抗生素环丙沙星。当使用 25mg/L 的环丙沙星时，HSO 改性的 EPS（EPS）吸附了 60.5%的环丙沙星。在磺化过程中，添加低剂量的 EDDS 可显著提高 EPS 的吸附能力。最佳改性条件为 95% HSO、0.002M EDDS、80°C 和 40min。增加吸附剂剂量可增强吸附效果。大约 0.2g/L 的 EPS 可在 30min 内有效吸附 97.8%的环丙沙星（554.3mg/g）。溶液 pH 对吸附有很大影响，最适宜的 pH 值为 6。Langmuir 等温线准确描述了 EPS 和 EPS（R=0.997-0.998）的吸附行为。EPS（q=1250mg/g）的吸附能力是 EPS（q=38.6mg/g）的 32 倍。1M HCl 可有效再生耗尽的吸附剂。最佳固液比和时间分别为 0.08g/20mL 和 60min。再生后的 EPS 在 10 次再生循环后仍保持较高的吸附能力（87.2%）。结果表明，EPS 吸附-再生过程是一种从水中去除环丙沙星的潜在方法。
