• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Polymers and the Environment >Thorium(IV) Recovery from Water and Sea Water Using Surface Modified Nanocellulose/Nanobentonite Composite: Process Design
【24h】

Thorium(IV) Recovery from Water and Sea Water Using Surface Modified Nanocellulose/Nanobentonite Composite: Process Design

机译：使用表面改性的纳米纤维素/纳米膨润土复合材料从水和海水中回收ium（IV）：工艺设计

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

Thorium(Th) contamination in the ground water an emerging environmental issue and Th recovery from sea water and nuclear wastewater is of high significance, as it is a major player in the energy sector. For the adsorption and recovery of Th, polymer grafted bio materials are reported as most efficient materials. P(IA/MAA)-g-NC/NB was prepared and all the steps in the synthetic routes were monitored using FTIR, SEM-EDS, and XRD, TG. Efficiency in removal of Th(IV) by P(IA/MAA)-g-NC/NB was tested by batch adsorption technique. The pH dependent Th(IV) adsorption process, was optimized at 4.5 and adsorption equilibrium was achieved within 120 min. Experimental kinetic data correlates well with pseudo-second-order equation, indicates adsorption was chemical process via ion exchange followed by complexation reaction, also could explain the film diffusion process of adsorption. Sips isotherm proved to best fit for the adsorption of Th(IV) onto P(IA/MAA)-g-NC/NB with maximum adsorption capacity of 95.19 mg/g. Thermodynamic studies revealed the endothermic nature, feasibility and spontaneity of the adsorption process. Delta Hx and Delta Sx were decreased to a small extent from -5.567 to -3.439 kJ/mol and increased from 11.18 to 18.39 J/mol, respectively, with increase in surface loading from 50 to 70 mg/g, indicating that the surface of the onto P(IA/MAA)-g-NC/NB is having energetically heterogeneous surface and there may be some lateral interactions between the adsorbed Th(IV) ions Repeated adsorption-desorption study over six cycles, adsorption percentage decreases from 99.0 to 94.6 %, proved the efficiency of P(IA/MAA)-g-NC/NB as an effective adsorbent for the removal and recovery of Th(IV) from aqueous solutions. Complete removal of Th(IV) ions from seawater containing 10 mg/L with a dose of 0.25 g/L P(IA/MAA)-g-NC/NB achieved. Batch adsorption system as double stage reactor designed from the adsorption isotherm data of Th(IV) by constructing operational lines. From these could be concluded that P(IA/MAA)-g-NC/NB is a promising candidate for the effective removal and removal of Th(IV) from industrial effluents phase and sea water. The maximum adsorption capacity Qs for Ceralite IRC-50 calculated which was found to be 179.67 mg/g which are considerably lower than those for P(IA/MAA)-g-NC/NB.
机译：地下水中的ium污染是一个新出现的环境问题，从海水和核废水中回收wastewater具有重要意义，因为它是能源领域的主要参与者。对于Th的吸附和回收，据报道聚合物接枝的生物材料是最有效的材料。制备了P（IA / MAA）-g-NC / NB，并使用FTIR，SEM-EDS和XRD，TG监测了合成路线中的所有步骤。通过间歇吸附技术测试了P（IA / MAA）-g-NC / NB对Th（IV）的去除效率。 pH依赖的Th（IV）吸附过程优化为4.5，并在120分钟内达到吸附平衡。实验动力学数据与拟二阶方程很好地相关，表明吸附是通过离子交换随后络合反应的化学过程，也可以解释吸附的膜扩散过程。事实证明，Sips等温线最适合Th（IV）吸附到P（IA / MAA）-g-NC / NB上，最大吸附容量为95.19 mg / g。热力学研究揭示了吸附过程的吸热性质，可行性和自发性。随着表面负载从50 mg / g增加到70 mg / g，Delta Hx和Delta Sx分别从-5.567减小到-3.439 kJ / mol并从11.18增大到18.39 J / mol，表面负荷从50增加到70 mg / g。 P（IA / MAA）-g-NC / NB上的表面具有能量异质性，被吸附的Th（IV）离子之间可能存在一些侧向相互作用，在六个循环中重复进行吸附-解吸研究，吸附百分比从99.0降低至94.6 ％，证明了P（IA / MAA）-g-NC / NB作为从水溶液中除去和回收Th（IV）的有效吸附剂的效率。以0.25 g / L P（IA / MAA）-g-NC / NB的剂量完全去除了含10 mg / L海水中的Th（IV）离子。通过构建操作管线，根据Th（IV）的吸附等温线数据设计了作为双级反应器的间歇式吸附系统。从这些可以得出结论，P（IA / MAA）-g-NC / NB是有效去除工业废水相和海水中Th（IV）的有希望的候选者。计算出的Ceralite IRC-50的最大吸附容量Qs为179.67 mg / g，大大低于P（IA / MAA）-g-NC / NB的吸附容量。

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