摘要
用Ｓｎ２＋、Ｓｎ４＋和２Ｓｎ２＋＋Ｓｎ４＋盐对天然丝光沸石进行了离子交换，测量了交换后清洗烘干样品的穆斯堡尔谱。通过对穆斯堡尔谱共振吸收峰相对面积的计算得出了样品中穆斯堡尔核的相对含量。结果表明，Ｓｎ４＋与天然丝光沸石的离子交换选择性优于Ｓｎ２＋。
Ion-exchange was conducted etween natural mordenite and aqueous solutions of three tin salts(SnCl_2·2H_2O,SnCl_4·5H_2O,2SnCl_2·2H_2O+SnCl_4·5H_2O)respectively.Ion-exchanged natural mordenite was washed 10 times by distilled water and then dried at 70 degree centigrade.Mossbauer spectra of washed and dried natural mordenite were recorded at same conditions.The relative areas of resonance absorption peaks were calculated according to the Mossbauer spectra recorede.The relative contents of Mossbauer nuclei contained in the samples were derived from the relative ares of resonance absoption peaks of Mossbauer spectra.The result indicated that the number of Sn^4+ is 5.8 times of that of Sn^2+ ,when they were exchanged into the channels of natural mordenite at same time.The conclusion was obtained that the ion-exchanged that the ion-exchange selectivity of natural mordenite to Sn^4+ is higher to Sn^2+ .
