Amidoxime-functionalized hydrothermal carbon materials for uranium removal from aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102462-102471 ◽  
Author(s):  
Zhibin Zhang ◽  
Zhimin Dong ◽  
Ying Dai ◽  
Saijin Xiao ◽  
Xiaohong Cao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
High Selectivity ◽  
Carbon Materials ◽  
Uranium Removal ◽  
Wide Ph Range ◽  
Ph Range

Amidoxime-functionalized hydrothermal carbon (AO-HTC) has been synthesized and applied to adsorb U(vi) from aqueous solutions, exhibiting a high selectivity above 60% for a wide pH range from 1.0 to 5.0.

Influence of pH on the Absorption and Fluorescence Spectra of 6,7-Dihydroxycoumarin in Aqueous Solution

1982 ◽  
Vol 37 (3) ◽  
pp. 262-265 ◽  
Author(s):  
Jerzy Grzywacz ◽  
Stanisława Taszner
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectra ◽  
Singlet State ◽  
Ph Value ◽  
Emission Spectra ◽  
Excited Singlet ◽  
Acid Base ◽  
Wide Ph Range ◽  
Ph Range ◽  
Influence Of Ph

Abstract Absorption and emission spectra of 6,7-dihydroxycoumarin [6,7-DHC] in aqueous solution over a wide pH range are reported. The absorption spectra proved to be strongly sensitive to the pH-value of the solution, whereas the emission spectra change in this range only insignificantly. An interpretation is attempted on the basis of the differences of the acid-base properties of the 6,7-DHC molecule in its ground and excited singlet state. For this purpose the pKa's and pKax's values have been calculated. It has been stated that in the excited state the phototautomer form is very unlikely.

A rapid and naked-eye visible rhodamine 6G-based chemosensor for sensitive detection of copper(ii) ions in aqueous solution

2018 ◽  
Vol 10 (47) ◽  
pp. 5731-5737 ◽  
Author(s):  
Q. Huang ◽  
Y. T. Chen ◽  
Y. W. Ren ◽  
Z. Y. Wang ◽  
Y. X. Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
High Selectivity ◽  
Rhodamine 6G ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Eye Recognition

The chemosensor R6GHP showed high selectivity for Cu2+ with “naked-eye” recognition in aqueous solutions.

scholarly journals Bio-template assisted synthesis of porous glutaraldehyde-polyethyleneimine particulate resin for selective copper ion binding and recovery

RSC Advances ◽  
2018 ◽  
Vol 8 (22) ◽  
pp. 12043-12052 ◽  
Author(s):  
Simarpreet Kaur ◽  
Ivan Kempson ◽  
Haolan Xu ◽  
Magnus Nydén ◽  
Mikael Larsson
Keyword(s):  
High Selectivity ◽  
High Capacity ◽  
Copper Ion ◽  
Precious Metals ◽  
Ion Binding ◽  
Ion Exchange Resins ◽  
Wide Ph Range ◽  
Ph Range ◽  
Exchange Resins ◽  
Template Assisted Synthesis

Porous ion-exchange resins with features of high selectivity, high capacity, fast adsorption kinetics and chemical stability over a wide pH range are attractive for extracting precious metals like copper and upcycling waste.

Utilization of cross-linked chitosan/bentonite composite in the removal of methyl orange from aqueous solution

2014 ◽  
Vol 71 (2) ◽  
pp. 174-182 ◽  
Author(s):  
Ruihua Huang ◽  
Qian Liu ◽  
Lujie Zhang ◽  
Bingchao Yang
Keyword(s):  
Methyl Orange ◽  
Aqueous Solutions ◽  
Ph Value ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Wide Ph Range ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Ph Range ◽  
A Minor

A kind of biocomposite was prepared by the intercalation of chitosan in bentonite and the cross-linking reaction of chitosan with glutaraldehyde, which was referred to as cross-linked chitosan/bentonite (CCS/BT) composite. Adsorptive removal of methyl orange (MO) from aqueous solutions was investigated by batch method. The adsorption of MO onto CCS/BT composite was affected by the ratio of chitosan to BT and contact time. pH value had only a minor impact on MO adsorption in a wide pH range. Adsorption kinetics was mainly controlled by the pseudo-second-order kinetic model. The adsorption of MO onto CCS/BT composite followed the Langmuir isotherm model, and the maximum adsorption capacity of CCS/BT composite calculated by the Langmuir model was 224.8 mg/g. Experimental results indicated that this adsorbent had a potential for the removal of MO from aqueous solutions.

Green synthesized silver nanoparticles for selective colorimetric sensing of Hg2+ in aqueous solution at wide pH range

The Analyst ◽  
2013 ◽  
Vol 138 (15) ◽  
pp. 4370 ◽  
Author(s):  
Selvan Sukanya Ravi ◽  
Lawrence Rene Christena ◽  
Nagarajan SaiSubramanian ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Colorimetric Sensing ◽  
Wide Ph Range ◽  
Ph Range ◽  
Green Synthesized Silver Nanoparticles

Triggered Cell Release from Shellac-Cells Composite Microcapsules

2013 ◽  
Vol 1498 ◽  
pp. 177-182
Author(s):  
Shwan A. Hamad ◽  
Simeon D. Stoyanov ◽  
Vesselin N. Paunov
Keyword(s):  
Aqueous Solution ◽  
Shear Stress ◽  
Aqueous Solutions ◽  
Slow Release ◽  
Culture Media ◽  
Low Ph ◽  
Yeast Cells ◽  
Triggered Release ◽  
Cell Release ◽  
Ph Range

ABSTRACTWe have fabricated novel shellac-cells composite microcapsules capable of pH-stimulus induced release of cells in a narrow pH range. The microcapsules were produced with yeast cells as a model for probiotics which were co-precipitated from an aqueous solution of ammonium shellac doped with pH-sensitive polyelectrolytes. The yeast cells in the composite shellac-cell microcapsules retained their viability even when treated with aqueous solutions of very low pH and subjected to shear stress. We studied the pH triggered release of cells from these microcapsules and measured their disintegration times. These microcapsules showed versatile responses ranging from slow release to explosive swelling at higher pH depending on the type and concentration of the polyelectrolyte integrated in the shellac microcapsules. We also observed growth-triggered release of cells from these microcapsules upon exposure to culture media. In both cases the cells retained their viability following their release from the microcapsules into the aqueous solution.

scholarly journals The mechanism of retention of vanadium oxo-species at the “titanium oxide / aqueous solution" interface

2013 ◽  
Vol 12 (3) ◽  
pp. 231-238
Keyword(s):  
Aqueous Solution ◽  
Titanium Oxide ◽  
Solution Concentration ◽  
Surface Groups ◽  
Compact Layer ◽  
Titration Curves ◽  
Solution Interface ◽  
Titania Surface ◽  
Wide Ph Range ◽  
Ph Range

The mechanism of retention of vanadium oxo-species at the “titanium oxide/aqueous solution” interface was investigated over a wide pH range (4-9) and V(V) solution concentration (10-5-2×10-2 M) by combining equilibrium deposition experiments, potentiometric titrations, microelectrophoresis and “proton–ion” titration curves. It was inferred that the adsorbed V(V) oxo-species are retained inside the compact layer of the interface through hydrogen/coordinative bonds forming very probably innersphere complexes with the titania surface groups.

scholarly journals The interaction of morin and morin-5’-sulfonic acid with lead(II): Study of the 1:1 complex formation process in aqueous solution

2019 ◽  
Vol 42 (1) ◽  
pp. 67-72
Author(s):  
Maxim A. Lutoshkin ◽  
Boris N. Kuznetsov ◽  
Vladimir A. Levdanskiy
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Sulfonic Acid ◽  
Computational Models ◽  
Experimental Parameters ◽  
Wide Ph Range ◽  
Ph Range ◽  
Aqueous Complexation ◽  
Complex Formation Process

Abstract This article focuses on the aqueous complexation between two flavonoids (morin and morinsulfonate) and Pb2+ at constant ionic strength I=0.5 M (NaClO4). The determination of stability constants of ML complexes were performed at wide pH range. Two obtained constants are 14.8 ± 0.1 and 15.2 ± 0.1 logarithmic units for morin and morin-5’-sulfonic acid, respectively. For estimating the thermodynamic stability of the complexes studied, the Def2-SV(P)/DFT/PBE0/SMD method has been used. Different computational models were tested to describe the data obtained. The theoretical values of logK reproduce the experimental parameters within reasonable errors.

Fluorescent Sensing of a Nerve Agent Simulant with Dual Emission over Wide pH Range in Aqueous Solution

2017 ◽  
Vol 23 (32) ◽  
pp. 7785-7790 ◽  
Author(s):  
Youngsam Kim ◽  
Yoon Jeong Jang ◽  
Sandip V. Mulay ◽  
Thuy-Tien T. Nguyen ◽  
David G. Churchill
Keyword(s):  
Aqueous Solution ◽  
Nerve Agent ◽  
Dual Emission ◽  
Fluorescent Sensing ◽  
Wide Ph Range ◽  
Ph Range
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