Anastasiou Marina, Sakkas Vasilios, Sleiman Mohamad
Institute of Chemistry of Clermont Ferrand, Université Clermont Auvergne, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France.
Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
Molecules. 2025 Aug 28;30(17):3514. doi: 10.3390/molecules30173514.
Sewage sludge, a byproduct of wastewater treatment, can be converted into biochar, offering a sustainable solution for waste management and water treatment. Although biochars from biomass have been widely studied, sewage sludge-derived biochars remain underexplored. This study investigated the use of alkaline-treated sewage sludge-derived biochar (AlBC) as an adsorbent for three water pollutants: caffeine (CAF), carbamazepine (CBZ), and 17α-ethinyl estradiol (EE2). A comprehensive analysis was conducted to explore the kinetic and thermodynamic behaviors of these pollutants under varying conditions, such as different adsorbent dosage, temperature, and water matrix values. The AlBCSS showed enhanced surface area and improved adsorption capacity, with EE2 being preferentially adsorbed (q: 9.51 mg g), followed by CAF (6.12 mg g) and CBZ (4.58 mg g). Adsorption followed the Langmuir isotherm for CAF and CBZ, and the Freundlich isotherm for EE2, while kinetics were best described by the pseudo-second-order and Elovich models. Thermodynamic analysis revealed that the adsorption process was spontaneous, primarily driven by physical interactions. Factors such as dosage, temperature, and pollutant concentration influenced adsorption, with no saturation observed at higher concentrations. The natural water matrix had a minimal effect on removal efficiency (40-100%), whereas AlBC exhibited promising results after four adsorption cycles. These results highlight the potential of sewage sludge-derived biochar as a sustainable adsorbent for emerging water pollutants, supporting circular economy practices in wastewater management.
污水污泥是废水处理的副产品，可转化为生物炭，为废物管理和水处理提供可持续的解决方案。尽管来自生物质的生物炭已得到广泛研究，但源自污水污泥的生物炭仍未得到充分探索。本研究调查了经碱处理的源自污水污泥的生物炭（AlBC）作为三种水污染物的吸附剂的用途：咖啡因（CAF）、卡马西平（CBZ）和17α-乙炔基雌二醇（EE2）。进行了全面分析，以探索这些污染物在不同条件下（如不同吸附剂剂量、温度和水基质值）的动力学和热力学行为。AlBCSS显示出增加的表面积和提高的吸附容量，其中EE2被优先吸附（q：9.51 mg/g），其次是CAF（6.12 mg/g）和CBZ（4.58 mg/g）。CAF和CBZ的吸附遵循朗缪尔等温线，EE2的吸附遵循弗伦德里希等温线，而动力学最好用拟二级和埃洛维奇模型描述。热力学分析表明，吸附过程是自发的，主要由物理相互作用驱动。剂量、温度和污染物浓度等因素影响吸附，在较高浓度下未观察到饱和现象。天然水基质对去除效率的影响最小（40-100%），而AlBC在四个吸附循环后显示出良好的结果。这些结果突出了源自污水污泥的生物炭作为新兴水污染物可持续吸附剂的潜力，支持废水管理中的循环经济实践。
