Separation and Purification Technology ( IF 8.1 ) Pub Date : 2021-03-04 , DOI: 10.1016/j.seppur.2021.118542 Yang Cai , Xiangyu Wen , Yuwei Wang , Haoran Song , Zhuo Li , Yingna Cui , Changping Li
A novel strategy to synthesize hyper-crosslinked polymers (HCPs) with hierarchical porous structure, high surface area, and high conjugated structure was developed. The hyperbranched poly(p-(2,2,2-triphenylethyl)styrene) (PTPES) polymer was designed as a precursor for hyper-crosslinking via Friedel-Crafts reaction. The unique three-dimensional molecular configuration of hyperbranched polymer and a large number of bulk end groups contribute to the construction of hyper-crosslinked hierarchical porous polymer. And the effect of branching degree of hyperbranched polymer on the porosity was clarified. The BET specific surface areas, total pore volumes, and average pore sizes of HCPs increase with the increase of branching degree of hyperbranched polymer. The resulting HCPs have a maximum BET specific surface area of 1068 m2 g−1 with hierarchical porous structure, and the highest total pore volume is up to 0.895 cm3/g. Furthermore, the adsorption performance of HCPs with aromatic pollutants was investigated by selecting naphthalene (N) and 1-naphthylamine (NA) as model adsorbates. The pseudo-second-order kinetic model and Freundlich isotherm model were found to fit well with adsorption processes of N and NA on HCPs. According to thermodynamic experiments, the adsorption of N and NA were exothermal and spontaneous. This strategy may provide a new approach for designing HCPs with hierarchical pores for water treatment.
中文翻译:
由超支化聚合物制备具有分级多孔结构的超交联聚合物,用于萘和1-萘胺的吸附
提出了一种新的策略来合成具有分级多孔结构,高表面积和高共轭结构的超交联聚合物。超支化的聚(对-(2,2,2-三苯乙基)苯乙烯)(PTPES)聚合物被设计为通过Friedel-Crafts反应进行超交联的前体。超支化聚合物的独特三维分子构型和大量本体端基有助于构建超交联的分级多孔聚合物。并阐明了超支化聚合物的支化度对孔隙率的影响。HCP的BET比表面积,总孔体积和平均孔径随超支化聚合物支化度的增加而增加。生成的HCP的最大BET比表面积为1068 m 2g -1具有分层的多孔结构,并且最高的总孔体积高达0.895 cm 3 / g。此外,通过选择萘(N)和1-萘胺(NA)作为模型吸附物,研究了六氯苯酚对芳香族污染物的吸附性能。发现伪二级动力学模型和Freundlich等温模型与NCP和NCP在HCP上的吸附过程非常吻合。根据热力学实验,N和NA的吸附是放热的和自发的。该策略可为设计具有分级孔的HCP进行水处理提供一种新方法。