半碳化离子交换纤维的制备及表征

Preparation and characterization of an ion exchanger based on semi-carbonized polyacrylonitrile fiber

利用硝酸氧化聚丙烯腈基半碳化纤维制备了一种新型的弱酸性阳离子交换纤维。利用Boehm滴定、反射红外、热重分析等手段表征了纤维表面的氧化性基团的含量、表面化学结构和热稳定性等性能，考察了纤维对金属离子的吸附性能。结果表明，该半碳化离子交换纤维有更高的热稳定性；其表面氧化性基团的含量达3．78mmovg；对铅、铜、镁离子的静态吸附量分别为25．3、8．2、4．5mg／g，表现出良好的离子交换与吸附性能。

A novel type of weakly acidic cation exchange fiber had been prepared by oxidation with nitric acid on the semi-carbonized polyacrylonitrile fiber. The physicochemical properties of the materials were investigated in terms of Boehm titration, Fourier transform infrared spectrometry, thermogravimetric analysis, atomic adsorption spectroscopy. The content of the surface functional groups containing oxygen is up to 3.78mmol/g. The fiber prepared shows higher thermal stability than ion exchange fiber based on polyacrylonitrile. The static adsorption capacity of the ion exchanger based on semi-carbonized polyacrylonitrile for Pb^2＋, Cu^2＋ and Mg^2＋ ions is 25.3, 8.2 and 4.5 mg/g, respectively.