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以衡县红壤、阳山高岭石和人工制备的铁膜红壤、铁膜高岭石、三水铝石、针铁矿为试材,在不同pH下研究它们对磷酸根离子的吸附量。结果表明:随pH上升,氧化铁类物质表面对磷酸的吸附量下降;对氧化铝类则起初随pH上升而增加,并达一最大的吸附值,而后则随pH上升而下降。从而在pH3—6之间形成一个磷酸的最大吸附峰。两种物质所以有此差别,主要原因是铁磷与铝磷表面复合物的稳定性所致。本结论合理解释了前人磷吸附研究中出现的纷乱现象。
Taking Hengxian red soil, Yangshan kaolinite and artificially prepared ferric red soil, iron film kaolinite, gibbsite and goethite as test materials, their adsorption capacity of phosphate ions was studied under different pH. The results showed that the adsorption of phosphoric acid on the surface of ferric oxide decreased with the increase of pH. At the beginning, the alumina increased with the increase of pH and reached the maximum adsorption value, and then decreased with the increase of pH. Thus forming a maximum adsorption peak of phosphoric acid between pH 3-6. So the difference between the two substances, mainly due to the stability of iron phosphate and aluminum-phosphorus surface complexes. This conclusion reasonably explains the chaos that appeared in previous studies on phosphorus adsorption.