氧化还原功能纤维的研究（Ⅲ）──含醇胺基纤维的制备及其对Au^（3＋）的吸附性能

Study on Functional Redox Fiber(Ⅲ )──Perparation of Fibers Containing Hydroxy-alkylamine Groups and Their Adsorption Properties Towards An￣(3+)

用二乙醇胺、乙醇胺及三乙醇胺与反应性氯甲基化纤维进行胺化反应，得到含氮量分别为２．２６、２．７１、１．８６ｍｍｏｌ／ｇ的功能纤维（编号依次为Ⅰ、Ⅱ、Ⅲ）．静态吸附实验结果表明，纤维Ⅰ在ｐＨ＝２．５对Ａｎ３＋的吸附量达最大（５５０ｍｇ／ｇ），纤维Ⅱ和Ⅲ在ｐＨ＝２．０对Ａｎ３＋的吸附量分别为６２０和４０９ｍｇ／ｇ它们都能将部分吸附态Ａｎ３＋还原成单质．纤维Ⅰ对吸附态Ａｎ３＋的还原百分率随ｐＨ值的升高而提高，ｐＨ。５．０时达８７％．ｐＨ＝２．０时纤维Ⅱ和Ⅲ对Ａｎ３＋的还原百分率达１００％；纤维Ⅰ、Ⅱ对Ａｎ３＋的吸附量随溶液温度升高而提高，另外，随溶液离子强度升高纤维Ⅰ对Ａｎ３＋的吸附量减小；在非水介质中，纤维Ⅰ、Ⅱ对Ａｕ３＋的吸附量比在水中小，但也能将部分吸附态金属离子还原成单质．吸附动力学实验结果表明，纤维Ⅰ对Ａｕ３＋的吸附在５０ｍｉｎ可达饱和吸附量的一半（即ｔ１／２＝５０ｍｉｎ）．用扫描电子显微镜观察到吸附在纤维Ⅰ上的金聚集成粒状．

Three kinds of functional fibers, Ⅰ, Ⅱ, and Ⅲ,are prepared by andnation of reactivechloromethylated fiber with diethanolamine, ethanolamine and triethanolamine, theirN-contents being 2. 16, 2.71 and 1 .8 6mmol/g respectively. ResultS of static adsorptionpenments indicate that adsorption amount of fiber I for An3+ reaches maximum,550mg/g, at PH2.5, those for fibers Ⅱ and Ⅲ being 62o and 409 mg/g respectively atPH2.0. The fibers reduce part of the adsorbed An3+ into An, and reduction percentageof An3+ adsorbed on fiber Ⅰ increases with rise of PH value. and reachal 87% atPHS.0, those on fibers Ⅱ and Ⅲ being 100 % at PH2.0. Adsorption amount of fiberI and fiber Ⅲ for An3+ increases with rile of solution temperature, but that of fiberI decreases with rise of solution ionic strength. Adsorption amount of fibers I, Ⅱ forAn3+ in non-water solvent is less than that in water, and part of adsorded An'+ is reduced to An too. The results of adsorptinn killatica experimentS show that it takes 50minuteS for fiber I to adsorb half of its saturated adsorbed amount for An3+,i.e.,t1/2=50 min. Grains of gold are observed under scanning electron microscope.