Preconcentration of Uranium(VI) on Modified and Unmodified Amberlite XAD 4 Sorbent

1993 ◽  
Vol 58 (8) ◽  
pp. 1813-1820 ◽  
Author(s):  
Jan Vácha ◽  
Lumír Sommer
Keyword(s):  
Spectrophotometric Determination ◽  
Uranyl Ion ◽  
Sodium Diethyldithiocarbamate ◽  
Uranyl Ions ◽  
Methanolic Solution

The sorption of uranyl ions on columns with the macrophorus hydrophobic sorbent Amberlite XAD 4 modified with 1-(2-pyridylazo)-2-naphthol and sodium diethyldithiocarbamate was examined. Following elution of the uranyl ion with HNO3 (2 - 4 mol l-1) or of the diethyldithiocarbamate UO22+-chelate with a methanolic solution of HCl (0.1 mol l-1), uranium was determined spectrophotometrically with 4-(2-pyridylazo)resorcinol or with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol. The preconcentration of uranium on Amberlite XAD 4 type sorbents is convenient for its spectrophotometric determination in waters.

A new organic-silica based nanocomposite prepared for spectrophotometric determination of uranyl ions

RSC Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 9563-9570 ◽  
Author(s):  
A. A. Elabd ◽  
O. A. Elhefnawy ◽  
A. M. El Nahrawy
Keyword(s):  
Sodium Silicate ◽  
Spectrophotometric Determination ◽  
Uranyl Ion ◽  
Uranyl Ions ◽  
Silicate Nanocomposites ◽  
Organic Silica

A new organic-silica based nanocomposite has been prepared for uranyl ion (UO22+) determination based on the absorbance enhancement of tartrazine incorporated copper sodium silicate nanocomposites (T-CSS).

scholarly journals Recognition and adsorption of uranyl ion by ion imprinted polymer based materials

2021 ◽  
Vol 290 ◽  
pp. 01007
Author(s):  
Jin Bai ◽  
Yang Yi ◽  
Xilin Xiao ◽  
Yi Ge
Keyword(s):  
Nuclear Power ◽  
Three Dimensional ◽  
Environmental Water ◽  
Uranyl Ion ◽  
Ion Imprinted Polymer ◽  
Uranyl Ions ◽  
Imprinted Polymer ◽  
Military Industry ◽  
Ion Imprinted ◽  
Cavity Structure

Ion imprinted polymer is a kind of three-dimensional material with special cavity structure. Its cavity site has the function of specifically recognizing and binding target ions. It is a kind of materials that can selectively combine, enrich and remove target ions in the environment. Uranium is an important radioactive element, which has been widely used in nuclear power, military industry, science and technology and other fields. However, the accumulation of uranyl ions in environmental water causes serious health hazards to human body. Therefore, the detection and enrichment of uranyl ions in water is of great significance. In this paper, the theory, technology and application status of ion imprinted polymer for micro detection and adsorption of uranyl particles in wastewater were reviewed, and the development of uranyl ion imprinted polymer was prospected.

Selective separation of thorium from uranyl ions using ultrasonic-assisted solidified floating organic drop microextraction

2021 ◽  
Author(s):  
Ghada El-Gamal ◽  
Wael Mortada ◽  
Mohammed Hassanien ◽  
Amr Awad Ibrahim ◽  
Yasmeen Gaber Abou El-Reash
Keyword(s):  
Accurate Determination ◽  
Selective Separation ◽  
Uranyl Ion ◽  
Uranyl Ions ◽  
Ultrasonic Assisted

The accurate determination of thorium (Th4+) in the existence of uranyl ion (UO22+) is a challenge facing analytical chemists. In this article, a solidified floating organic drop microextraction procedure (SFODME)...

Zinc oxide impregnated resin for preconcentration and spectrophotometric determination of uranyl ions in aqueous solutions

2018 ◽  
Vol 106 (7) ◽  
pp. 569-579
Author(s):  
O. A. Elhefnawy ◽  
A. A. Elabd
Keyword(s):  
Aqueous Solutions ◽  
Spectrophotometric Determination ◽  
Adsorption Process ◽  
Fourier Transforms ◽  
Sol Gel ◽  
Uranyl Ions ◽  
X Ray ◽  
Relative Standard ◽  
Impregnated Resin

Abstract The objective of this work is to find a new, efficient and alternate low-cost adsorbent for preconcentration and spectrophotometric determination of uranyl ions U(VI) from aqueous solution. For this reason the new impregnated resin (ZnO/7HP) has been prepared by sol-gel technique. Characterization of ZnO/7HP was conducted using scanning electron microscopy/energy-dispersive X-ray spectrometer and X-ray diffraction, and Fourier transforms infrared spectroscopy. Several important parameters influencing the U(VI) adsorption such as pH, adsorbent amount, initial U(VI) concentration, contact time and temperature were investigated systematically by batch experiments. The obtained results showed that the equilibrium adsorption data were well fitted to the Langmuir model with a maximum adsorption amount of 24.96 mg/g. While the adsorption kinetics data were described well by the pseudo-second order model. This result indicates that the adsorption process is chemisorption. Thermodynamic results indicate that the U(VI) adsorption process is endothermic nature and favors at high temperature. Hydrochloric acid was used for preconcentration of U(VI) and detected spectrophotometry after the reaction with Arsenazo III. According to the definition of International Union of Pure and Applied Chemistry, the detection limit of this method was 0.12 μg/L. The relative standard deviation under optimum conditions is less than 3.0 % (n=5). The new impregnated resin ZnO/7HP is a promising adsorbent for preconcentration and spectrophotometric determination of U(VI) in aqueous solutions.

Supramolecular based-ligandless ultrasonic assisted-dispersion solidification liquid–liquid microextraction of uranyl ion prior to spectrophotometric determination with dibenzoylmethane

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2394-2401 ◽  
Author(s):  
Ardeshir Shokrollahi ◽  
Hadi Behrooj Pili
Keyword(s):  
Spectrophotometric Determination ◽  
Environmentally Friendly ◽  
Uranyl Ion ◽  
Spectrophotometric Detection ◽  
Ultrasonic Assisted ◽  
Environmentally Friendly Method ◽  
Liquid Microextraction

A simple and environmentally friendly method has been developed for preconcentration of uranyl ion by supramolecular based-ligandless ultrasonic assisted-dispersion solidification liquid–liquid microextraction before spectrophotometric detection.

A TEM and EPR Investigation of the Competitive Binding of Uranyl Ions to Starburst Dendrimers and Liposomes:  Potential Use of Dendrimers as Uranyl Ion Sponges

Langmuir ◽  
2000 ◽  
Vol 16 (19) ◽  
pp. 7368-7372 ◽  
Author(s):  
M. Francesca Ottaviani ◽  
Paolo Favuzza ◽  
Massimo Bigazzi ◽  
Nicholas J. Turro ◽  
Steffen Jockusch ◽  
...  
Keyword(s):  
Competitive Binding ◽  
Uranyl Ion ◽  
Uranyl Ions ◽  
Potential Use
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