【摘要】 研究了ｐＨ 和总钼酸根浓度对海水中钼酸根在针铁矿上吸附的影响。钼酸根在针铁矿上的吸附等温线为Ｓ型。假设海水中钼酸根在针铁矿表面的吸附，是在双电层的内Ｈｅｌｍｈｏｌｔ 层中的能量相等的不同位置上进行的，并考虑到吸附的钼酸根之间存在着横向相互作用，由此推导得到的吸附等温式可描述钼酸根在针铁矿上的Ｓ型吸附等温线，并计算得到钼酸根在针铁矿上的最大吸附量为４ ．７６ ×１０－ ５ｍｏｌ／ｇ。钼酸根在针铁矿上的吸附受溶液ｐＨ影响，吸附密度随ｐＨ 的增加而降低。加入到海水中的钼约有２０ ％ 可被水合氧化铁的清除作用所转移。更多还原

【Abstract】 The adsorption of molybdate on goethite under changing conditions of pH and total solution molybdate concentration were investigated in the sea water medium. S shape isotherms were observed for the adsorption of molybdate on goethite. The S shape isotherm can be described by an estimated equation in which the adsorption of molybdate is considered to take place on the energetically equivalent but distinct sites of the inner Helmholtz plane(IHP) of the double electric layer on the surface of the goethite particles suspended in the seawater medium, and lateral interactions exist between the adsorbed molybdate ions. The calculated maximum adsorption amount of molybdate on goethite is 4.76×10 -5 mol/g. Molybdate adsorption on goethite is influenced by solution pH. Sorption density decreased with increasing pH. The results indicated that the scavenging of iron hydroxides could remove approximately 20% of the molybdenum added to seawater medium.更多还原