• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Characterization and adsorption properties of cross-linked yeast/β-cyclodextrin polymers for Pb(ii) and Cd(ii) adsorption
【24h】

Characterization and adsorption properties of cross-linked yeast/β-cyclodextrin polymers for Pb(ii) and Cd(ii) adsorption

机译：交联酵母/β-环糊精聚合物对Pb（ii）和Cd（ii）吸附的表征和吸附性能

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, a crosslinked yeast/β-cyclodextrin polymer (Y–β-CDP), for use as an effective adsorbent for removal Pb( II ) and Cd( II ) ions from aqueous solution, has been innovatively prepared by grafting β-cyclodextrin (β-CD) onto the surface of baker's yeast (BY) and thiomalic acid as a crosslinker. Several characterization techniques, such as SEM equipped with an EDS analyzer, FTIR, XRD, and XPS were employed characterize the Y–β-CDP. The impact of various operating parameters, such as pH, adsorbent dosage, initial concentration of metal ions, contact time and solution temperature, as well as adsorption kinetics, isotherms and thermodynamics were systematically investigated. The adsorption of Pb( II ) and Cd( II ) on Y–β-CDP reached equilibrium in 25 min, and the kinetic process conforms to the pseudo-second order model. The Langmuir model was used to describe the adsorption isotherm data better than the Freundlich model. The predicted maximum adsorption capacity at 25 °C for Pb( II ) and Cd( II ) was 150.08 and 102.80 mg g ~(?1) , respectively, when the initial concentration of metal ions was 120 mg L ~(?1) . The thermodynamic analysis revealed that the adsorption procedure of Pb( II ) and Cd( II ) onto Y–β-CDP was spontaneous and endothermic. Furthermore, regeneration experiments demonstrated that Y–β-CDP had excellent recyclability. Together, all results suggested that Y–β-CDP could potentially be a promising adsorbent in the purification of water contaminated with heavy metal ions.
机译：在这项研究中，通过接枝β-淀粉，创新地制备了一种交联的酵母/β-环糊精聚合物（Y–β-CDP）作为从水溶液中去除Pb（II）和Cd（II）离子的有效吸附剂。将环糊精（β-CD）置于面包酵母（BY）的表面上，并将硫代苹果酸作为交联剂。几种表征技术，例如配备EDS分析仪的SEM，FTIR，XRD和XPS表征了Y-β-CDP。系统地研究了pH，吸附剂用量，金属离子的初始浓度，接触时间和溶液温度等各种操作参数的影响，以及吸附动力学，等温线和热力学。 Y-β-CDP上Pb（II）和Cd（II）的吸附在25分钟内达到平衡，动力学过程符合拟二级模型。与Freundlich模型相比，使用Langmuir模型更好地描述了吸附等温线数据。当金属离子的初始浓度为120 mg L〜（？1）时，在25°C下对Pb（II）和Cd（II）的最大吸附容量预计分别为150.08和102.80 mg g〜（？1）。热力学分析表明，Pb（II）和Cd（II）在Y–β-CDP上的吸附过程是自发的并且是吸热的。此外，再生实验表明，Y–β-CDP具有出色的可回收性。总之，所有结果表明，Y-β-CDP可能是净化重金属离子污染水的有前途的吸附剂。

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