Sorption Enhancement of Aromatic Sulfonates onto an Animated Hyper-Cross-Linked Polymer

摘要

A macroreticular resin adsorbent CHA-101 was aminated by dimethylamine,and a novel sorbent named M-101 was obtained.Several industrially important aromatic sulfonates including sodium benzenesulfonate (BS),sodium p-tol-uenesulfonate (TS),and sodium 2-naphthalenesulfonate (NS) were selected as general solutes to evaluate the performance of the newly synthesized resin particles.X-ray photoelectron spectroscope (XPS) analyses was used to determine the protonation degree of amino group at different solution pH,and the effect of pH on the sorption of these solutes onto M-101 can be explained by the ion exchange mechanism.The experimentally observed sequence of the sorption capacity of the tested organic sulfonates onto M-101 indicates that the pi-pi interaction between the solute molecule and the polymer matrix plays an important role in uptake of organic sulfonates from aqueous solution.Sodium sulfate was selected as a typical competitive inorganic anion,and improved selectivity of BS sorption over sulfate on M-101 was observed by comparison with a common macroporous weak base anion exchanger D-301.In addition,both sorption and desorption kinetics of M-101 were also found to be faster than that of D-301.Analyses of sorption isotherms and thermodynamics proved that BS sorption on M-101 was an exothermic and more selective process than on D-301.Both column tests and field applications proved M-101 to be an effective sorbent that can be used to remove aromatic sulfonates from aqueous solution.