在AgCl-NaCl体系中用炭棉吸附银

探索了用纱状炭棉从ＡｇＣｌ－ＮａＣｌ体系中吸附Ａｇ的方法。在现有文献及前期工作基础上，考察了硫脲添加方式，硫脲浓度，Ａｇ＋浓度，吸附时间，溶液酸度，Ｃａ２＋浓度以及温度对吸附效果的影响。考虑综合经济效益，指出的合理条件为：吸附前采用硫脲浸泡炭棉；硫脲浓度：３ｇ／Ｌ；Ａｇ＋浓度；０．０７３ｇ／Ｌ；吸附时间：１．５ｈ；炭棉浸泡时间：３０ｍｉｎ；溶液酸度：自然中性；Ｃａ２＋浓度：１０００ｐｐｍ；吸附温度：室温（２５℃±）。以上条件实验较好的吸附率达到９７％，吸附量也达７１ｋｇ／ｔ，在优化组合条件下将会有更好的吸附效果。

The Aromatic Ring Stacking Interaction of the Pd 2+ dppe PCA System by Extraction Method

The percentages of the stacked isomers of the Pd 2+ dppe PCA system, where dppe=1, 2 bis (diphenylphosphino) ethane, PCA=Bz, PAc, PPr and PBu, have been determind by extraction method in chloroform medium (I=1.0, pH=2.0). The chemical composition of extracted species determined by slope and synthesis method is Pd (dppe) (PCA) 2 . Under the same conditions, it shows that the stacking interaction is related to the number of methlene groups of the PCA. A fiting length of the chain alkanecarboxylates can make a best stacking interaction between two phenyl ring of the ligands.