以氯甲基化聚苯乙烯微球为原料,通过“催化交联-胺基改性”工艺路线,制备出一种新型的二甲胺基超高交联聚合物吸附剂D-HPA,并在系统表征D-HPA理化特性的基础上,考察了其对废水中苯酚和对硝基酚的吸附性能。研究结果表明,制备的D-HPA具有较高的比表面积、丰富的微孔结构和二甲胺基团,对苯酚和对硝基酚的吸附性能显著优于商品化聚合物吸附剂D301和XAD-4。溶液pH对D-HPA的吸附性能有较大影响,当pH=6时苯酚和对硝基酚的吸附量分别可达122.9mg/L和132.7mg/L。准二级动力学模型和Freundlich等温吸附模型可以较好地拟合D-HPA的吸附过程,且吸附属于多分子层吸附,为放热反应。循环“吸附-脱附”和柱吸附实验表明,吸附饱和的D-HPA可用碱液高效再生,再生后对苯酚和对硝基酚的吸附性能稳定,能够长期稳定循环使用,在实际含酚废水处理中具有较好的应用前景。
A novel dimethylamine-functionalized hyper-crosslinked polymeric adsorbent (D-HPA) was synthesized from chloromethylated polystyrene microspheres through a “catalytic crosslinking-amino modification” process.The physicochemical properties of D-HPA were systematically characterized,and its performance in adsorbing phenol and 2-nitrophenol from wastewater was evaluated.The results revealed that D-HPA exhibited a high specific surface area,sufficient micropore region and dimethylamine groups,endowing it with significantly superior adsorption performance for phenol and p-nitrophenol compared to commercial polymer adsorbents D301 and XAD-4.The adsorption of D-HPA was a pH-dependent process,with maximum capacities of 122.9mg/g for phenol and 132.7mg/g for 2-nitrophenol at pH=6.The adsorption data were well described by pseudo-second-order kinetics and Freundlich isotherm models,indicating a multilayer adsorption mechanism and exothermic nature.Cyclic adsorption-desorption and column adsorption experiments demonstrated that the exhausted D-HPA could be effectively regenerated using alkaline solutions,and after regeneration,D-HPA could maintain stable removal efficiency for phenol and 2-nitrophenol,making it potential for long-term cyclic use in phenol-containing wastewater treatment.
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基金资助
国家自然科学基金面上项目(52070160);江苏省重点研发计划社会发展项目(BE2023751);扬州大学高端人才支持计划(2020);扬州市科技计划项目(YZ2025089)
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