【摘要】 通过磷等温吸附与饱和吸附后释放试验,研究了高岭土、蒙脱土、凹凸棒土、蛭石和沸石对溶液中磷的吸附效果及其影响因素。结果表明,蛭石磷理论饱和吸附量最大,为3473mg·kg-1,其他依次为凹凸棒土、黄褐土、蒙脱土、下蜀黄土和沸石,高岭土磷理论饱和吸附量最低,为554mg·kg-1。影响粘土矿物和粘土磷理论饱和吸附量的主要因素是钙含量和胶体氧化铁及氧化铝的含量,pH值、阳离子交换量和比表面对磷理论饱和吸附量影响不大,粘土矿物和粘土吸附磷的机制主要为化学吸附。粘土矿物和粘土磷饱和吸附后释放试验表明其磷释放量很低。更多还原

【Abstract】 Phosphorus adsorption of kaolinite,montmorillonite,attapulgite,vermiculite and zeolite and their affecting factors were studied through experiment on isotherm P adsorption and post-saturation-adsorption P release.Results show that vermiculite is theoretically the highest in P saturation adsorption capacity,being 3 473 mg·kg^-1 and followed by attapulgite,yellow cinnamon soil,montmorillonite and Xiashu loess,zeolite and kaolinite.The last is the lowest in theoretic P saturation adsorption capacity,lingering at 554 mg·kg^-1.The P adsorption capacity of these clay minerals and soils was mainly influenced by their contents of reactive Ca,Fe and Al,but it was not much affected by soil pH value,CEC and specific surface of the clay minerals and soils,because the main mechanism of the adsorption is chemical sorption.Meanwhile another experiment on desorption of phosphorus from these clay minerals and soils saturated with phosphorus was also conducted.Results show that P release from the clay minerals and soils after P saturation adsorption was very limited.更多还原