腐殖酸—柱撑膨润土的制备及其对铀(VI)的吸附性能

Studying on Preparation of Humic Acid-immobilized Aluminum-pillared Clay and its Adsorption Performance to U(VI)

采用腐殖酸(HA)修饰铝—柱撑膨润土(Al-PILC),制备得到腐殖酸—柱撑膨润土(HA-Al-PILC),用于去除含铀废水中的铀.通过静态吸附实验考察了投加量、pH值,接触时间、U(VI)初始浓度对吸附的影响,同时进行了吸附解吸实验.试验结果表明,HA修饰后的Al-PILC对U(VI)的去除能力有了一定程度的提高;HA-AlPILC对U(VI)有很好的去除效果,150 min左右吸附达到平衡,最佳投加量为1.0 g/L,最佳pH值在6左右;HA-Al-PILC能重复使用.

Humic acid-immobilized aluminum-pillared clay （ HA-Al-PILC ） was prepared with Humic acid and immobilized aluminum-pillared clay （ Al-PILC ） . HA-Al-PILC was used as the adsorbent to remove the U（ VI） from contained-uranium wastewater. To investi-gate the effects of experimental parameters on adsorption behavior,a batch of experiments were performed by changing adsorbent dose,solution pH,initial U（ VI） ions concentration, contact time. The results indicated that the amount of adsorbed uranium is greater for HA-Al-PILC,when compared to Al-PILC;adsorption equilibrium tends to be achieved in 150 min;dosage of 1 . 0 g/L;pH=6 . The adsorbent was suitable for repeated use without any noticeable loss of capacity.