The suspension polymerization with two organic phases was adopted to prepare spherical hypercrosslinked resin by self-polycondensation of 4,4′-bis-(chloromethyl)-1,1′-biphenyl (CMB). The chemical structure, morphology and pore characteristics of the novel spherical resin were characterized with Fourier transform infrared spectroscopy (FTIR), micrograph and Brunauer-Emmett-Teller (BET). It is found that the suspension system and stirring speed impose a great influence upon the regularity and size distribution of hypercrosslinked beads. To prepare CMB resin beads with diameter of about 300 μm, the optimal condition is as follows: stirring speed 300 r·min-1 , and the volume ratio of the two organic phases (nitrobenzene/dimethyl silicon oil) 1︰5. After the self-polycondensation and succedent post-crosslinking of CMB monomer, the spherical adsorbent presents high special surface area (1190 m2 ·g-1 ) and abundant pore volume (0.714 cm 3 ·g-1 ), and could be potentially applied in the adsorption of various organic molecules and synthesis of porous ion exchanger.
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.
