Hybrid gel reinforced with coating layer for removal of phenol from aqueous solution
Hybrid gel reinforced with coating layer for removal of phenol from aqueous solution
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DOI：
10.1016/j.cej.2007.06.025
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发表时间：
2008-05-01
影响因子：
15.1
通讯作者：
Kurumada, Ken-Ichi
中科院分区：
文献类型：
--
作者：
Pan, Gaofeng;Kurumada, Ken-Ichi
在前人制备苯酚吸附水凝胶的基础上，我们的目标是完成苯酚的吸附凝胶材料。作为一种实际要求，它需要在机械上更耐用，以便重复使用吸附和解吸。在早期的工作中，我们成功地制备了N-异丙基丙烯酰胺(NIPAM)与磷酸三丁酯(TBP)复合的水凝胶。这种杂化凝胶被证明是有效的去除溶解在水中的苯酚。在本工作中，我们成功地用聚乙烯醇(PVA)薄层涂层通过反复冻融将上述杂化凝胶完全封闭。包覆后的杂化凝胶的机械耐久性有了显著的提高。在对苯酚的吸附性能上，PVA薄层涂层几乎不阻碍苯酚的传质。通过将吸附凝胶浸泡在氢氧化钠溶液中，充分提高了吸附苯酚的解吸(剥离)的机械耐久性。在不损失苯酚吸附能力的情况下，吸附和解吸的循环可以重复进行。(C)2007 Elsevier B.V.保留所有权利。
Following our preceding results of fabricating phenol adsorbing hydrogel, we aimed to complete adsorbent gel material for removal of phenol. As a practical requirement, it needs to be mechanically more durable for repeated use of adsorption and desorption. In earlier works, we succeeded in fabricating N-isopropylacrylamide (NIPAM) hydrogel incorporated with tributyl phosphate (TBP). This hybrid gel was shown to be effective for removal of phenol dissolved in water. In this work, we succeeded in sealing the above hybrid gel completely with poly(vinyl alcohol) (PVA) thin layer coating by repeated freezing and thawing. The coated hybrid gel was remarkably improved in its mechanical durability. In the performance of adsorption of phenol, the PVA thin layer coating hardly hindered the mass transfer of phenol. The mechanical durability was sufficiently improved for the desorption (stripping) of the adsorbed phenol by immersing the adsorbent gel in sodium hydroxide solution. The cycle of the adsorption and desorption could be repeated without loss of the phenol adsorbing ability. (C) 2007 Elsevier B.V. All rights reserved.