研究了花生壳对咖啡因和三氯生的吸附性能。分析了花生壳的化学成分,形态学,和表面官能团。使用含30mg/L咖啡因和三氯生的溶液进行了批量吸附和固定床柱实验。检查的参数包括花生壳粒径(120-150、300-600和800-2000µm),吸附剂剂量(0.02-60g/L),接触时间(最长180分钟),床高(4-8厘米),和水力负荷率(2.0和4.0m3/m2-天)。确定最佳吸附条件后,动力学,等温线,并应用穿透曲线模型对实验数据进行了分析。花生壳显示出不规则的表面,主要由多糖组成(约70%的木质素,纤维素,和半纤维素),具有1.7m2/g的比表面积和0.005cm3/g的孔体积。咖啡因(85.6±1.4%)和三氯生(89.3±1.5%)的最高去除效率是使用最小的颗粒和10.0和0.1g/L的剂量在180和45分钟内实现的。分别。与咖啡因相比,三氯生具有更高的亲脂性,因此更容易去除。伪二阶动力学模型提供了与实验数据的最佳拟合,提示咖啡因/三氯生和吸附剂之间的化学吸附过程。Sips模型很好地描述了平衡数据,咖啡因和三氯生的最大吸附容量为3.3mg/g和289.3mg/g,分别。在固定床柱吸附试验中,颗粒大小显著影响效率和水力行为,120-150μm颗粒对咖啡因(0.72mg/g)和三氯生(143.44mg/g)的吸附能力最高,尽管存在堵塞问题。实验数据也显示出与Bohart-Adams的良好一致性,托马斯,和Yoon-Nelson模型.因此,这项研究的结果不仅强调了花生壳去除咖啡因和三氯生的有效能力,而且还强调了它们在不同情况下作为水处理和卫生应用的有希望的选择的多功能性。
Peanut shells\' adsorption performance in
caffeine and triclosan removal was studied. Peanut shells were analyzed for their chemical composition, morphology, and surface functional groups. Batch adsorption and fixed-bed column experiments were carried out with solutions containing 30 mg/L of
caffeine and triclosan. The parameters examined included peanut shell particle size (120-150, 300-600, and 800-2000 µm), adsorbent dose (0.02-60 g/L), contact time (up to 180 min), bed height (4-8 cm), and hydraulic loading rate (2.0 and 4.0 m3/m2-day). After determining the optimal adsorption conditions, kinetics, isotherm, and breakthrough curve models were applied to analyze the experimental data. Peanut shells showed an irregular surface and consisted mainly of polysaccharides (around 70% lignin, cellulose, and hemicellulose), with a specific surface area of 1.7 m2/g and a pore volume of 0.005 cm3/g. The highest removal efficiencies for
caffeine (85.6 ± 1.4%) and triclosan (89.3 ± 1.5%) were achieved using the smallest particles and 10.0 and 0.1 g/L doses over 180 and 45 min, respectively. Triclosan showed easier removal compared to
caffeine due to its higher lipophilic character. The pseudo-second-order kinetics model provided the best fit with the experimental data, suggesting a chemisorption process between
caffeine/triclosan and the adsorbent. Equilibrium data were well-described by the Sips model, with maximum adsorption capacities of 3.3 mg/g and 289.3 mg/g for caffeine and triclosan, respectively. In fixed-bed column adsorption tests, particle size significantly influenced efficiency and hydraulic behavior, with 120-150 µm particles exhibiting the highest adsorption capacity for caffeine (0.72 mg/g) and triclosan (143.44 mg/g), albeit with clogging issues. The experimental data also showed good agreement with the Bohart-Adams, Thomas, and Yoon-Nelson models. Therefore, the findings of this study highlight not only the effective capability of peanut shells to remove caffeine and triclosan but also their versatility as a promising option for water treatment and sanitation applications in different contexts.