...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Encapsulation and Adsorption Sciences >Fe-Oxide Nanomaterial: Synthesis, Characterization and Lead Removal
【24h】

Fe-Oxide Nanomaterial: Synthesis, Characterization and Lead Removal

机译：氧化铁纳米材料：合成，表征和脱铅

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

摘要

Organic solvent free iron oxide nanomaterial used for lead removal was synthesized by co-precipitation method. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopic with energy dispersive X-ray analysis (SEM-EDX), X-ray diffraction (XRD) and thermo gravimetric-differential thermal (TG-DTA) analysis were used to determine the surface characteristics and analysis of iron oxide. Optimization of solution pH, adsorbent dosage, contact time, agitation speed and initial lead ion concentration were conducted for further adsorption isotherm, kinetics, thermodynamics and desorption study. Langmuir sorption isotherm model fits the adsorption data better than Freundlich, Dubinin-Radushkevich (D-RK) and Flory-Huggins (FH) models. The mean adsorption energy and free energy obtained from D-RK and FH models guides that the mechanism was under control of physical adsorption and actuality of spontaneous reaction, respectively. From kinetics of adsorption pseudo second (PSO) model fits well than pseudo first (PFO) and Elovich adsorption-reaction models. And to test whether the reaction is under control of adsorption-diffusion or not the intra particle diffusion (IPD) model was tested, but it fails to pass through the origin. This indi cates that the reaction mechanism only under control of adsorption-reaction. The maximum adsorption capacity ( q _( max ) ) of the adsorbent was 70.422 mg/g.
机译：采用共沉淀法合成了用于去除铅的有机无溶剂氧化铁纳米材料。傅立叶变换红外光谱（FT-IR），具有能量色散X射线分析（SEM-EDX）的扫描电子显微镜，X射线衍射（XRD）和热重差热分析（​​TG-DTA）用于确定氧化铁的表面特性和分析。优化溶液的pH，吸附剂用量，接触时间，搅拌速度和初始铅离子浓度，以进一步进行吸附等温线，动力学，热力学和解吸研究。 Langmuir吸附等温线模型比Freundlich，Dubinin-Radushkevich（D-RK）和Flory-Huggins（FH）模型更适合吸附数据。从D-RK和FH模型获得的平均吸附能和自由能表明，该机理分别受物理吸附和自发反应现实的控制。从吸附动力学来看，伪第二（PSO）模型比伪第一（PFO）和Elovich吸附反应模型拟合得更好。并测试反应是否处于吸附扩散控制之下，是否测试了粒子内扩散（IPD）模型，但该模型未能通过原点。这表明反应机理仅在吸附反应的控制下。吸附剂的最大吸附容量（ q_（max））为70.422mg / g。

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