Adsorption of Fluoride from Aqueous Solution by a Synthetic Iron(III)−Aluminum(III) Mixed Oxide

2007 ◽  
Vol 46 (16) ◽  
pp. 5346-5356 ◽  
Author(s):  
Krishna Biswas ◽  
Sanat Kumar Saha ◽  
Uday Chand Ghosh
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide

Fluoride removal efficiency from aqueous solution by synthetic iron(III)–aluminum(III)–chromium(III) ternary mixed oxide

Desalination ◽  
2010 ◽  
Vol 255 (1-3) ◽  
pp. 44-51 ◽  
Author(s):  
Krishna Biswas ◽  
Kaushik Gupta ◽  
Arijit Goswami ◽  
Uday Chand Ghosh
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Mixed Oxide ◽  
Fluoride Removal ◽  
Ternary Mixed Oxide

Removal of As(V) from aqueous solution by Ce-Fe bimetal mixed oxide

2016 ◽  
Vol 4 (3) ◽  
pp. 2892-2899 ◽  
Author(s):  
Uttam Kumar Sahu ◽  
Manoj Kumar Sahu ◽  
Siba Sankar Mohapatra ◽  
Raj Kishore Patel
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide

scholarly journals Activity in the Photodegradation of 4-Nitrophenol of a Zn,Al Hydrotalcite-Like Solid and the Derived Alumina-Supported ZnO

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 702
Author(s):  
Raquel Trujillano ◽  
César Nájera ◽  
Vicente Rives
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Photocatalytic Degradation ◽  
Hydrothermal Treatment ◽  
Layered Double Hydroxide ◽  
Mixed Oxide ◽  
Photocatalytic Performance ◽  
Ageing Treatment ◽  
Calcined Hydrotalcite ◽  
Double Hydroxide

A Zn,Al layered double hydroxide (LDH), with the hydrotalcite structure and the mixed oxide obtained upon its calcination at 650 °C, was tested in the adsorption and photocatalytic degradation of 4-Nitrophenol in aqueous solution. The Zn,Al LDH was fast and easily obtained by the coprecipitation method. Hydrothermal treatment under microwave irradiation was applied to compare the effect of the ageing treatment on the photocatalytic behavior. The efficiency of the synthetized solids was compared to that of a commercial ZnO. The ageing treatment did not improve the performance of the original samples in the degradation of 4-nitrophenol. The activity of the synthetized solids tested exceeded that observed for the reaction with commercial ZnO. The photocatalytic performance of the original non-calcined hydrotalcite is similar to that of commercial ZnO. The calcined hydrotalcite showed a better performance in the adsorption-degradation of the contaminant than ZnO, and its reusability would be possible as it recovered the hydrotalcite-like structure during the reaction.

Hydrothermal synthesis of a layered-type W–Ti–O mixed metal oxide and its solid acid activity

2017 ◽  
Vol 7 (1) ◽  
pp. 243-250 ◽  
Author(s):  
Toru Murayama ◽  
Kiyotaka Nakajima ◽  
Jun Hirata ◽  
Kaori Omata ◽  
Emiel J. M. Hensen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Synthesis ◽  
Metal Oxide ◽  
Mixed Oxide ◽  
Solid Acid ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Titanium Sulfate

A layered-type W–Ti–O mixed oxide was synthesized by hydrothermal synthesis from an aqueous solution of ammonium metatungstate and titanium sulfate.

Catalytic properties of copper–manganese mixed oxides prepared by coprecipitation using tetramethylammonium hydroxide

2014 ◽  
Vol 4 (10) ◽  
pp. 3713-3722 ◽  
Author(s):  
Hisahiro Einaga ◽  
Akihiro Kiya ◽  
Satoru Yoshioka ◽  
Yasutake Teraoka
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Oxide Catalysts ◽  
Tetramethylammonium Hydroxide ◽  
Mixed Oxide Catalysts ◽  
Metal Nitrates ◽  
Copper Manganese ◽  
Coprecipitation Technique

Copper–manganese (Cu–Mn) mixed oxide catalysts were prepared by a coprecipitation technique from metal nitrates in aqueous solution using tetramethylammonium hydroxide (TMAH) as a pH regulator.

Adsorption mechanism of poly(vinyl alcohol) at the mixed oxide Cu x O y –SiO 2 /aqueous solution interface

2015 ◽  
Vol 356 ◽  
pp. 905-910 ◽  
Author(s):  
M. Wiśniewska ◽  
V. Bogatyrov ◽  
K. Szewczuk-Karpisz ◽  
I. Ostolska ◽  
K. Terpiłowski
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide ◽  
Vinyl Alcohol ◽  
Adsorption Mechanism ◽  
Poly Vinyl Alcohol ◽  
Solution Interface

Adsorption of arsenate from aqueous solution on binary mixed oxide of iron and silicon

2012 ◽  
Vol 192 ◽  
pp. 90-98 ◽  
Author(s):  
T. Mahmood ◽  
S.U. Din ◽  
A. Naeem ◽  
S. Mustafa ◽  
M. Waseem ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Mixed Oxide

Rehydration of Calcined Mg-Al Hydrotalcite in Acidified Chloride-Containing Aqueous Solution

2007 ◽  
Vol 72 (9) ◽  
pp. 1284-1294 ◽  
Author(s):  
Bruno Kostura ◽  
František Kovanda ◽  
Marta Valášková ◽  
Juraj Leško
Keyword(s):  
Aqueous Solution ◽  
Crystalline Structure ◽  
Mixed Oxide ◽  
Molar Ratio ◽  
Final Solution ◽  
Constant Concentration ◽  
Rehydration Solution ◽  
Hcl Concentration ◽  
Hydroxide Hydrate

The rehydration of periclase-like Mg-Al mixed oxide obtained by calcination of hydrotalcite- like precursor with a Mg/Al molar ratio of 2 was carried out in KCl-HCl solutions at various pH and constant concentration of Cl-. A buffer equilibrium accompanied by leaching out of Mg2+ cations from the solid was observed during rehydration, when reconstruction of the layered hydrotalcite structure takes place. With increasing HCl concentration in the rehydration solution, the Mg/Al molar ratio in the obtained solid gradually decreased from about 1.5 to 0.3. An anomaly was found, when the increasing concentration of acid resulted in increasing pH of final solution. The XRD measurements showed that the initially formed hydroxide form of hydrotalcite is transformed into randomly interstratified forms of the Mg-Al hydroxide hydrate/Mg-Al chloride hydroxide hydrate, which are accompanied by the release of OH- anions into solution. The crystalline structure of rehydrated product decreased as Mg2+ cations were released into solution, which was accompanied by incorporation of Cl- into the solid.

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