设计制备了离子液体(IL)基超交联聚合物(HCPs)用于吸附脱除水溶液中酚类污染物,采用含苯基IL为单体,分别以1,4-二氯苄(DCX)和1,4-联苯二氯苄(BCMBP)为交联剂,通过调整IL单体和交联剂比例,两步法合成了HCP-DCXs和HCP-BCMBPs系列超交联聚合物;通过扫描电镜、红外光谱、比表面积和孔径分析仪、热分析仪等手段对该材料进行表征;考察了该材料对水中苯酚、对氯苯酚(4-CP)、对硝苯酚(4-NP)的吸附性能。结果表明:HCPs具有丝状或球形颗粒不规则堆积的多孔级结构,比表面积最高达1424.7m2/g;吸附脱酚过程快速,在30min内可达到吸附平衡,吸附动力学符合准二级动力学模型;吸附容量显著,其中HCP-BCMBP3对苯酚、4-CP和4-NP的最大吸附量分别可达186.9mg/g、377.0mg/g和384.2mg/g;HCP-BCMBPs吸附容量总体高于HCP-DCXs,且HCPs对不同酚吸附容量规律为4-NP≥4-CP>苯酚,吸附等温数据符合Langmuir和Freundlich模型,吸附过程放热;采用乙酸乙酯对HCP-BCMBP3进行再生,经5次循环对4-CP的吸附性能在85%以上。开发了高效HCPs材料吸附剂,可为治理含酚废水提供新的探索。
In this paper,ionic liquid (IL)-based hypercrosslinked polymers (HCPs) were designed and prepared for the adsorption of phenolic pollutants from aqueous solutions.Two series of polymers,HCP-DCXs and HCP-BCMBPs,were synthesized via a two-step method by adjusting the ratio of the monomer,phenyl-containing (IL) to crosslinking agents,1,4-dichlorobenzyl chloride (DCX) and 1,4-biphenylbis(methylene chloride)benzyl chloride (BCMBP).The materials were characterized by scanning electron microscopy,infrared spectroscopy,specific surface area and pore size analyzer,and thermal analyzer.Further,the adsorption abilities for p-chlorophenol (4-CP),p-nitrophenol (4-NP) and phenol,in water were investigated.The results showed that the HCPs had a porous grade structure with irregular stacking of filamentous or spherical particles,and the specific surface area was up to 1424.7m2/g.The adsorption and dephenolization process proceeded rapidly,reaching adsorption equilibrium within 30 min,and the adsorption kinetics were in accordance with the quasi-secondary kinetic model.The adsorption capacity was remarkable,in which the maximum adsorption capacity of HCP-BCMBP3 for phenol,4-CP and 4-NP could be up to 186.9mg/g,377.0mg/g,and 384.2mg/g,respectively.HCP-BCMBPs showed higher adsorption capacity than that of HCP-DCXs,and the adsorption quantity of HCPs for different phenol pollutants followed the order of 4-NP≥4-CP>Phenol.The adsorption isothermal data conformed to the Langmuir and Freundlich model,and the adsorption process was exothermic.Ethyl acetate was employed to regenerate HCP-BCMBP3,and its adsorption performance for 4-CP was above 85% after five cycles.This study developed efficient HCPs material adsorbent,providing a new exploration for the treatment of phenol-containing wastewater.
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基金资助
国家自然科学基金(22008183);绿色化工过程教育部重点实验室开放基金项目(GCP2023008)
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