Allouss Dalia, Abatzoglou Nicolas, Achouri Inès Esma
Group of Research on Technologies and Processes, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.
Canada Research Chair on Process Intensification for Advanced Catalyst and Sustainable Energy, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.
Materials (Basel). 2025 May 21;18(10):2412. doi: 10.3390/ma18102412.
Addressing the removal of hazardous phenolic pollutants from water, this study introduces an eco-friendly adsorbent composed of waste-derived hydrochar immobilized in alginate beads (Alg/HC). The physicochemical properties of the Alg/HC beads were characterized using SEM, XRD, and FTIR, confirming hydrochar encapsulation and partial structural preservation. Batch studies revealed a maximum 2-nitrophenol (2-NP) adsorption capacity of 15.80 ± 0.62 mg/g at 30 mg/L of 2-NP, with kinetics best described by the Elovich and pseudo-second-order models. Freundlich isotherm fitting indicated multilayer adsorption on heterogeneous surfaces, likely governed by hydrogen bonding and π-π interactions. In a fixed-bed column system, Alg/HC beads demonstrated a continuous adsorption capacity of 6.84 ± 0.45 mg/g at 10 mg/L of 2-NP, with breakthrough behavior modeled by the Yoon-Nelson and Thomas equations. The beads maintained stable performance across four regeneration cycles using a mild water/ethanol desorption method. This work represents the first study to explore Alg/HC composites for 2-NP removal in both batch and continuous modes, demonstrating their potential as low-cost, regenerable adsorbents for tertiary treatment of phenolic industrial wastewater.
针对从水中去除有害酚类污染物的问题，本研究引入了一种由固定在藻酸盐珠粒（Alg/HC）中的废弃衍生水炭组成的环保吸附剂。使用扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对Alg/HC珠粒的物理化学性质进行了表征，证实了水炭的包封和部分结构保留。批量研究表明，在2-硝基苯酚（2-NP）浓度为30 mg/L时，最大2-NP吸附容量为15.80±0.62 mg/g，其动力学最好用埃洛维奇模型和伪二级模型描述。弗伦德利希等温线拟合表明在异质表面上发生多层吸附，可能受氢键和π-π相互作用控制。在固定床柱系统中，Alg/HC珠粒在2-NP浓度为10 mg/L时表现出6.84±0.45 mg/g的连续吸附容量，其穿透行为用尹-尼尔森方程和托马斯方程建模。使用温和的水/乙醇解吸方法，珠粒在四个再生循环中保持稳定性能。这项工作是首次探索Alg/HC复合材料以分批和连续模式去除2-NP的研究，证明了它们作为酚类工业废水三级处理低成本、可再生吸附剂的潜力。
