A fibrous sorbent possessing abundant micropore structure was firstly prepared via post-crosslinking reaction on the PP-ST-DVB original fiber. Its micromorphology and sorptive properties were investigated, and the results demonstrated that the novel fibrous hypercrosslinked sorbent has narrow pore-size distribution, small average porous radius (1.90 nm), high specific surface area (362.31 m^2/g), and fine sorptive properties for small organic molecules.
Feng LiuSi Guo YuanXiao Li WangA.E PolikarpovA.A. Shunkevich
A fibrous strong base anion exchanger(QAPPS) was prepared for the first time via chloromethylation and quaternary amination reaction of polyphenylene sulfide fiber(PPS),and its physical-chemical structure and adsorption behavior for Cr(VI) were characterized by FTIR,Energy Dispersive Spectrometry,TG-DTG,elemental analysis and batch adsorptive technique,respectively.The novel fibrous adsorbent could effectively adsorb Cr(VI) over the pH range 1-12,the maximum adsorption capacity was 166.39 mg/g at pH 3.5,and the adsorption behavior could be described well by Langmuir isotherm equation model.The adsorption kinetics was studied using pseudo first-order and pseudo second-order models,and the t 1/2 and equilibrium adsorption time were 5 and 20 min respectively when initial Cr(VI) concentration was 100 mg/L.The saturated fibers could be regenerated rapidly by a mixed solution of 0.5 mol/L NaOH and 0.5 mol/L NaCl,and the adsorption capacity was well maintained after six adsorption-desorption cycles.
用氯甲醚作为后交联剂,对聚丙烯接枝苯乙烯二乙烯苯(PP ST DVB)纤维的Friedel-Crafts交联反应进行了研究,制备出具有高比表面积的新型功能纤维.结果表明,PP-ST-DVB纤维经交联反应后,比表面积明显增加,可增大至原纤维150多倍,增加的幅度与交联反应条件有重要关系.对交联纤维进一步磺化,结果显示,经Friedel-Crafts交联反应制得的新型功能纤维磺化反应速度较原纤维有显著提高,反应条件更为温和.
