检索结果-南通市图书馆

Chitosan-praseodymium complex for adsorption of fluoride ions from water

Journal of Rare Earths 2015年第10期33卷 1104-1113页

作者： eny kusrini Nofrijon Sofyan Nyoman Suwartha Gefin Yesya Cindy Rianti Priadi Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Department of Metallurgical and Materials Engineering Faculty of Engineering Universitas Indonesia Department of Civil Engineering Faculty of Engineering Universitas Indonesia

Engineering of chitosan by praseodymium has been investigated to improve the adsorption properties as well as physical characteristics of chitosan. Modification of chitosan changes the original properties of chitosan so that it can be more suitable for adsorption of fluoride ions. In this study, chitosan-praseodymium （Chi-Pr） was synthesized by impregnation method. The Chi-Pr complex was characterized by scanning electron microscopic-energy dispersive X-ray spectroscopy （SEM-EDX）, Fourier transform infrared （FTIR） and employed as an adsorbent for removal of fluorides ions from water in the batch system. The variables such as contact time, concentration of Pr, adsorbent dose, initial concentration of fluoride ions, and competitor anions were studied. The adsorption efficiency of fluoride ions （n） with increasing Pr loading into chitosan （5 wt.%, 10 wt.%, 15 wt.%, 20 wt.% and 25 wt.%） were 35.5%, 56.1%, 72.0%, 68.5% and 62.5%, respectively. The Chi-Pr （15 wt.%） complex had the highest fluoride removal efficiency （72.0%）. The experimental data fitted well to the Langmuir isotherm with maximum adsorption capacity （qmax） of 15.87 mg/g and an equilibrium constant （kL） of 0.15 mg. Kinetic study revealed that the adsorption of fluoride ions from water followed pseudo-second-order model with a maximum adsorption capacity （q2） of 8.20 mg/g and a rate constant （k2） of 0.01 g/***. Adsorption efficiency of fluoride ions in the simulated drinking water was diminished with the changes in pH levels. The presence of Pr3＋ in chitosan increased chitosan＇s performance as an adsorbent for adsorption of fluoride ions.

关键词： adsorption of fluoride chitosan isotherms studies kinetics study praseodymium rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Junction properties and conduction mechanism of new terbium complexes with triethylene glycol ligand for potential application in organic electronic device

引用

Journal of Rare Earths 2014年第7期32卷 633-640页

作者： N.K.Za’aba M.A.Mohd Sarjidan W.H.Abd.Majid eny kusrini Muhammad I.Saleh Low Dimensional Materials Research Centre Physics DepartmentUniversity Malaya Department of Chemical Engineering Faculty of EngineeringUniversitas Indonesia School of Chemical Sciences Universiti Sains Malaysia

Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-Pic/Al, using spin coating technique. The UV-Vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-Pic thin film exhibited a direct transition with Eg of 2.70 eV. The electronic parameters of the ITO/EO3-Tb-Pic/Al device such as the ideality factor n, barrier height Φb, saturation current Io, and series resistance Rs, were extracted from the conventional lnI-V, Cheung＇s functions and Norde＇s method. It was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional I-V method. In the double logarithmic I-V plot, three distinct regions based on the slope were identified, and the conduction mechanisms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（V·s）. This newly obtained lanthanide complex may be potentially utilized in electronic devices.

关键词： terbium-picrate complex triethylene glycol Tauc model optical band gap current-voltage rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Structural,spectroscopic and luminescence studies of terbium(Ⅲ) triethylene glycol picrate complex

Structural,spectroscopic and luminescence studies of terbium...

引用

第六届国际稀土开发与应用研讨会

作者： Muhammad Idiris Saleh eny kusrini School of Chemical Sciences Universiti Sains Malaysia11800 PenangMalaysia Department of Chemical Engineering Faculty of EngineeringUniversity of Indonesia16424 DepokIndonesia

The[Tb(Pic)(HO)(EO3)](Pic).0.5(EO3) complex(Fig.1),where EO3 and Pic is triethylene glycol and picrate anion,respectively,has successfully been prepared and *** Tb(Ⅲ) complex is crystallized in triclinic with space group *** Tb(Ⅲ) ion is coordinated to nine oxygen atoms from one EO3 ligand,one water molecule and two Pic *** EO3 ligand,the Pic anions and the central Tb(Ⅲ) metal ion affect overall on the structure of cation,geometry,and role of the Pic anion as a bidentate,monodentate and/or counteranion in the complex.A H NMR under variable temperature study showed a reversible dynamic *** photoluminescence(PL) spectrum of complex displayed characteristic narrow bands arising from intraconfigurational transitions of the Tb(Ⅲ) ion and exhibited green color emission(D→F,J = 0,2,3,4,5,6).The acyclic E03 ligand seriously affects the PL intensity and its conformation on structure of[Tb(Pic)(HO)(EO3)] *** heavier lanthanide complex leads to form a nine-coordination number which is due to the lanthanide contraction effect,the acyclic polyether chain length and number of donor oxygen atoms

关键词： NMR Photoluminescence Picrate complex Terbium Triethylene glycol

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：