• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Adsorption of hexavalent chromium on cationic starches with different degree of crosslinking
【24h】

Adsorption of hexavalent chromium on cationic starches with different degree of crosslinking

机译：不同交联度的阳离子淀粉对六价铬的吸附

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The influence of the degree of crosslinking in the association with the degree of cationization on the adsorption of Cr(VI) by crosslinked cationic starches (CCS) was examined. The amount of adsorbed Cr(VI) depends on the preparation of CCS before adsorption experiments (dry or preswollen CCS) and has a higher value when dry CCS are used. The amount of crosslinks in CCS needed to reach the maximum effectiveness of the cationic groups of CCS in the binding of Cr(VI) depends also on the form in which CCS are used. The adsorption capacity for Cr(VI) decreases both with dry and preswollen CCS when the adsorption temperature increases. The thermodynamic parameters are calculated. The negative values of Delta G degrees and Delta H degrees indicated that the adsorption process in both cases was spontaneous and exothermic. If preswollen CCS is used, the entropy change has a positive value and indicates that the randomness of the system increases, whereas the negative value of entropy change when Cr(VI) species are adsorbed by dry CCS shows that in this case the order of the system increases like in the classical adsorption process. (c) 2007 Wiley Periodicals, Inc.
机译：考察了交联度与阳离子化程度对交联阳离子淀粉（CCS）对Cr（VI）吸附的影响。 Cr（VI）的吸附量取决于吸附实验（干燥或预溶胀的CCS）之前CCS的制备，并且在使用干燥CCS时具有较高的值。为了使CCS的阳离子基团在Cr（VI）的结合中发挥最大作用所需的CCS中的交联量还取决于使用CCS的形式。干燥温度和预溶胀的CCS对Cr（VI）的吸附能力随吸附温度的升高而降低。计算热力学参数。 ΔG度和ΔH度的负值表明两种情况下的吸附过程都是自发的且放热的。如果使用预溶胀的CCS，则熵变具有正值，表明系统的随机性增加，而当Cr（VI）物质被干燥CCS吸附时，熵变的负值表明在这种情况下，像经典的吸附过程一样，系统增加（c）2007年Wiley Periodicals，Inc.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号