Synthesization characterization and properties of Quaternary Ammonium Cationic Cellulose

摘要

A new environmental functional material-quaternary ammonium cationic cellulose (QACC) was synthesized in this paper.Preparation conditions were optimized.The modified cellulose was fully characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM).The stability of QACC was studied.Adsorption rules of water-soluble persistent organic pollutants to QACC were discussed.At 75°C, using isopropyl alcohol as a dispersing agent, QACC was prepared by the reaction of alkali-treated cellulose with 3-chloro-2-hydroxypropyl trimethylammonium chloride (CHPTA) in presence of alkali for 4h.The nitrogen content of QACC was 1.71% and the degree of substitution (DS) was 0.243.The peak of 1637cm-1 in IR suggested the existence of quaternary ammonium group in QACC.The XRD results showed that the crystallinity decreased but the specific surface area increased after modification.A series of destructive experiments showed that QACC had strong resistance to hydrolysis, oxidation and UV-irradiation.In neutral aqueous solution, adsorption rules of QACC towards water-soluble aromatic series organic pollutants were summarized as follows: stronger acidity and larger plane molecular structure advantaged the adsorption and the adsorption capacity of QACC would not increase obviously when several lewis base groups grafted on the aromatic ring synchronously.For simple preparation process and great stability, QACC can be applied to the treatment of water-soluble organic pollutants.