scholarly journals Quantitative evaluation of key properties of dry and wet metal oxides and metal hydroxides as well as of their potential determining cations in aqueous solutions

2021 ◽  
pp. 102592
Author(s):  
Jarl B. Rosenholm
Keyword(s):  
Aqueous Solutions ◽  
Metal Oxides ◽  
Quantitative Evaluation ◽  
Metal Hydroxides

scholarly journals Nickel–cobalt hydroxide: a positive electrode for supercapacitor applications

RSC Advances ◽  
2020 ◽  
Vol 10 (33) ◽  
pp. 19410-19418
Author(s):  
M. Sangeetha Vidhya ◽  
G. Ravi ◽  
R. Yuvakkumar ◽  
Dhayalan Velauthapillai ◽  
M. Thambidurai ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Electrode Material ◽  
Positive Electrode ◽  
Cobalt Hydroxide ◽  
Critical Component ◽  
Metal Hydroxides ◽  
Nickel Cobalt ◽  
Supercapacitor Applications

So far, numerous metal oxides and metal hydroxides have been reported as an electrode material, a critical component in supercapacitors that determines the operation window of the capacitor.

scholarly journals Exsolution of Nickel Nanoparticles from Mixed‐Valence Metal Oxides: A Quantitative Evaluation by Magnetic Measurements

2020 ◽  
Vol 37 (2) ◽  
pp. 1900472 ◽  
Author(s):  
Victor B. Tinti ◽  
Debora Marani ◽  
Andre S. Ferlauto ◽  
Fabio C. Fonseca ◽  
Vincenzo Esposito ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Quantitative Evaluation ◽  
Nickel Nanoparticles ◽  
Magnetic Measurements ◽  
Mixed Valence

Semiempirical Correlation between the Optical Band Gap of Oxides and Hydroxides and the Electronegativity of Their Constituents

2000 ◽  
Vol 654 ◽  
Author(s):  
Francesco Di Quarto ◽  
Monica Santamaria ◽  
Salvatore Piazza ◽  
Carmelo Sunseri
Keyword(s):  
Metal Oxides ◽  
Band Gap ◽  
Optical Band Gap ◽  
Experimental Results ◽  
Passive Films ◽  
Metal Hydroxides ◽  
Amorphous Tio2 ◽  
The Difference

AbstractOn the basis of new experimental results a previous proposed correlation between the optical band gap of oxides and the difference of electronegativity of their constituents is extended to mixed crystalline and amorphous TiO2-Fe2O3 (d,d-metal oxides) as well as to amorphous passive films grown on Al-Ta, Al-Ti, Al-Nb and Al-W alloys (sp,d-metal oxides). Moreover in analogy with previous results on anhydrous oxides, a correlation is proposed between the optical band gap of hydroxides and the electronegativities of their constituents after substituting the electronegativity of hydroxilic group to that of the oxygen. Like in the case of anhydrous oxides, two different interpolation lines have been found for sp-metal and d-metal hydroxides, respectively.

Phosphate adsorption on metal oxides and metal hydroxides: A comparative review

2016 ◽  
Vol 24 (3) ◽  
pp. 319-332 ◽  
Author(s):  
Mengxue Li ◽  
Jianyong Liu ◽  
Yunfeng Xu ◽  
Guangren Qian
Keyword(s):  
Metal Oxides ◽  
Phosphorus Removal ◽  
Low Cost ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Alkaline Solutions ◽  
Synthesis Methods ◽  
Mechanism Study ◽  
Metal Hydroxides ◽  
Comparative Review

Phosphorus removal from wastewater is important for eutrophication control of water bodies. Metal oxides and metal hydroxides have always been developed and investigated for phosphorus removal, because of their abundance, low cost, environmental friendliness, and chemically stability. This paper presents a comparative review of the literature on the preparation methods, adsorption behaviors, adsorption mechanisms, and the regeneration of metal (hydr)oxides (e.g., Fe, Zn, Al, etc.) with regard to phosphate removal. The contrasting results showed that metal hydroxides could offer an effective and economic alternative to metal oxides, because of their cost–benefit synthesis methods, higher adsorption capacities, and shorter adsorption equilibrium times. However, the specific surface area of metal oxides is larger than that of metal hydroxides because of the calcination process. Metal oxides with a higher pH at the zero point of charge have wider optimal adsorption pH ranges than metal hydroxides because of their surface precipitation in alkaline solutions. The regeneration of metal oxides using acids, bases, and salts and that of metal hydroxides using acids and bases has been critically examined. Further research on uniform metal (hydr)oxides with small particle size, high stabilities, low cost, and that are easily regenerated with promising desorbents are proposed. In addition, quantitative mechanism study and application in continuous-mode column trials are also suggested.

SOLUBILITY OF METAL OXIDES IN SUPERCRITICAL AQUEOUS SOLUTIONS

1963 ◽  
Author(s):  
W. J. Silva ◽  
Jr Smith ◽  
R. C.
Keyword(s):  
Aqueous Solutions ◽  
Metal Oxides
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