盐类对光解水放氢反应的影响

报道ＮａＣｌ，ＫＣｌ，ＭｇＣｌ２和ＣａＣｌ２对光解水放氢影响的某些结果．在所研究的ＴｉＯ２，Ｋ２ＰｔＣｌ６，ＥＤＴＡ酸（或还原铁粉）的反应系统中，ＭｇＣｌ２，ＣａＣｌ２对产氢的影响大于ＮａＣｌ和ＫＣｌ，ＮａＣｌ对产氢的影响大于ＫＣｌ．与没有盐类存在时相比，加入盐类可使放氢增至２倍以上．海水中的Ｋ＋，Ｎａ＋，Ｃａ＋＋和Ｍｇ＋＋浓度均落在对反应速度变化较敏感的浓度区域，而且用ＮａＣｌ，ＫＣｌ，ＭｇＣｌ２和ＣａＣｌ２４种盐类模拟海水，也可以使放氢量提高至２倍以上，提示这类反应可能在生物进化中的重要地位．

Effect of Salts on Photochemical Hydrogen Production for TiO_2 Suspensions in Aerated Water

The production of hydrogen from water in the presence of salts under the irradintion of near ultroviolet rays was studied using TiO2 as a photosensitizer, K2PtCl6 as a catalyst and EDTA (or iron powder reduced) as a electron relay. The yield of hydrogen from water in the system with salt is more than two fold as much as the system without salt. The effect of salts in the system relates to the electric charge and the size of Positive ion, Mg >Ca >Na >K . It is interested to note that the concentration of K , Na ,Ca .Mg in seawater are all in the range of sensitive concentration of the reaction system. When simulated seawater (27. 2mg/mL NaCl,0. 745mg/mL KCl, 11. 2mg/mL MgCl2, 1. 16mg/mL CaCl2) is used instead of distilled water,the ratio of hydrogen production has gone up to 2. 24. It implied, that the reaction syStem may be important for biogenesis.