Wang Yali, Wang Zhenrui, Liu Zile, He Xiyue, Zeng Zequan
School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China.
Shandong Xinhua Design & Engineering Co., Ltd., Zibo 255000, China.
Materials (Basel). 2025 Aug 1;18(15):3628. doi: 10.3390/ma18153628.
The removal of high-concentration m-cresol from industrial wastewater remains a significant challenge due to its toxicity and persistence. In this study, a commercially available functionalized resin with a high BET surface area (1439 m g) and hierarchical pore structure was employed for the adsorption of pure m-cresol at an initial concentration of 20 g L, representative of coal-based industrial effluents. Comprehensive characterization confirmed the presence of oxygen-rich functional groups, amorphous polymeric structure, and uniform surface morphology conducive to adsorption. Batch experiments were conducted to evaluate the effects of resin dosage, contact time, temperature, and equilibrium concentration. Under optimized conditions (0.15 g resin, 60 °C), a maximum adsorption capacity of 556.3 mg g and removal efficiency of 71% were achieved. Kinetic analysis revealed that the pseudo-second-order model best described the adsorption process (R > 0.99). Isotherm data fit the Langmuir model most closely (R = 0.9953), yielding a monolayer capacity of 833.3 mg g. Thermodynamic analysis showed that adsorption was spontaneous (ΔG° < 0), endothermic (ΔH° = 7.553 kJ mol), and accompanied by increased entropy (ΔS° = 29.90 J mol K). The good agreement with the PSO model is indicative of chemisorption, as supported by other lines of evidence, including thermodynamic parameters (e.g., positive ΔH° and ΔS°), surface functional group characteristics, and molecular interactions. The adsorption mechanism was elucidated through comprehensive modeling of adsorption kinetics, isotherms, and thermodynamics, combined with detailed physicochemical characterization of the resin prior to adsorption, reinforcing the mechanistic understanding of m-cresol-resin interactions.
由于其毒性和持久性，从工业废水中去除高浓度间甲酚仍然是一项重大挑战。在本研究中，使用了一种具有高BET表面积（1439 m²/g）和分级孔隙结构的市售功能化树脂，用于吸附初始浓度为20 g/L的纯间甲酚，该浓度代表煤基工业废水。综合表征证实了富含氧的官能团、无定形聚合物结构以及有利于吸附的均匀表面形态的存在。进行了批量实验以评估树脂用量、接触时间、温度和平衡浓度的影响。在优化条件（0.15 g树脂，60°C）下，实现了最大吸附容量556.3 mg/g和去除效率71%。动力学分析表明，准二级模型最能描述吸附过程（R²>0.99）。等温线数据最符合朗缪尔模型（R = 0.9953），单层容量为833.3 mg/g。热力学分析表明吸附是自发的（ΔG°<0）、吸热的（ΔH° = 7.553 kJ/mol），并且伴随着熵的增加（ΔS° = 29.90 J/mol·K）。与PSO模型的良好一致性表明是化学吸附，其他证据也支持这一点，包括热力学参数（例如，正的ΔH°和ΔS°）、表面官能团特征和分子相互作用。通过对吸附动力学、等温线和热力学进行综合建模，并结合吸附前树脂的详细物理化学表征，阐明了吸附机制，加强了对间甲酚 - 树脂相互作用的机理理解。
