Hydrolysis of tetracalcium phosphate under a near-constant-composition condition—effects of pH and particle size

Biomaterials ◽  
2005 ◽  
Vol 26 (4) ◽  
pp. 393-401 ◽  
Author(s):  
Laurence C Chow ◽  
Milenko Markovic ◽  
Stanislav A Frukhtbeyn ◽  
Shozo Takagi
Keyword(s):  
Particle Size ◽  
Constant Composition ◽  
Tetracalcium Phosphate ◽  
Effects Of Ph ◽  
Composition Condition ◽  
Hydrolysis Of

scholarly journals Immobilization of Pt nanoparticles on hydrolyzed polyacrylonitrile-based nanofiber paper

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Soon Yeol Kwon ◽  
EunJu Ra ◽  
Dong Geon Jung ◽  
Seong Ho Kong
Keyword(s):  
Particle Size ◽  
Uniform Distribution ◽  
Pt Nanoparticles ◽  
Electrochemical Activity ◽  
Aggregate Formation ◽  
Free Standing ◽  
Pt Electrode ◽  
Catalytic Current ◽  
Nucleation Sites ◽  
Hydrolysis Of

AbstractThe electrochemical activity of catalysts strongly depends on the uniform distribution of monodisperse Pt nanoparticles without aggregates. Here, we propose a new hydrolysis-assisted smearing method for Pt loading on a free-standing paper-type electrode. Polyacrylonitrile (PAN)-based nanofiber paper was used as the electrode, and it acted as a Pt support. Hydrolysis of the electrode tripled the number of active nucleation sites for Pt adsorption on the PAN nanofibers, thereby significantly enhancing the wettability of the nanofibers. This facilitated the uniform distribution of Pt nanoparticles without aggregate formation up to 40 wt% (about 0.8 mg/cm2) with a particle size of about 3 nm. The catalytic current of the hydrolyzed Pt electrode in CH3OH/H2SO4 solution exceeded 213 mA/cm2 Pt mg, which was considerably greater than the current was 148 mA/cm2 Pt mg for an unhydrolyzed electrode.

Hydrogen Generation by Hydrolysis of the Ball Milled Al-C-KCl Composite Powder in Distilled Water

2012 ◽  
Vol 519 ◽  
pp. 87-91 ◽  
Author(s):  
Xia Ni Huang ◽  
Zhang Han Wu ◽  
Ke Cao ◽  
Wen Zeng ◽  
Chun Ju Lv ◽  
...  
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Fine Particle ◽  
Composite Powder ◽  
Hydrogen Generation ◽  
Aluminum Particle ◽  
Generation Rate ◽  
Composite Powders ◽  
Fine Particle Size ◽  
Hydrolysis Of

In the present investigation, the Al-C-KCl composite powders were prepared by a ball milling processing in an attempt to improve the hydrogen evolution capacity of aluminum in water. The results showed that the hydrogen generation reaction is affected by KCl amount, preparation processing, initial aluminum particle size and reaction temperature. Increasing KCl amount led to an increased hydrogen generation volume. The use of aluminum powder with a fine particle size could promote the aluminum hydrolysis reaction and get an increased hydrogen generation rate. The reaction temperature played an important role in hydrogen generation rate and the maximum hydrogen generation rate of 44.8 cm3 min-1g-1of Al was obtained at 75oC. The XRD results identified that the hydrolysis byproducts are bayerite (Al(OH)3) and boehmite (AlOOH).

Effects of pH and Calcium on Hydrolysis of Na2SiF6and Na2SnF6

1991 ◽  
Vol 25 (2) ◽  
pp. 101-107 ◽  
Author(s):  
N. Eidelman ◽  
L.C. Chow
Keyword(s):  
Effects Of Ph ◽  
Hydrolysis Of

scholarly journals Synergistic effects of pH and organosolv lignin addition on the enzymatic hydrolysis of organosolv-pretreated loblolly pine

RSC Advances ◽  
2018 ◽  
Vol 8 (25) ◽  
pp. 13835-13841 ◽  
Author(s):  
Chenhuan Lai ◽  
Maobing Tu ◽  
Qiang Yong ◽  
Shiyuan Yu
Keyword(s):  
Enzymatic Hydrolysis ◽  
Loblolly Pine ◽  
Synergistic Effects ◽  
Organosolv Lignin ◽  
Effects Of Ph ◽  
Hydrolysis Of

The effect of ethanol organosolv lignin (EOL) on enzymatic hydrolysis was examined at pH 4.8–6.0.

scholarly journals A model for the uptake and release of Ca2+ by sarcoplasmic reticulum

1987 ◽  
Vol 245 (3) ◽  
pp. 739-749 ◽  
Author(s):  
G W Gould ◽  
J M McWhirter ◽  
J M East ◽  
A G Lee
Keyword(s):  
Skeletal Muscle ◽  
Sarcoplasmic Reticulum ◽  
Atpase Activity ◽  
External Medium ◽  
Spontaneous Release ◽  
Calculated Concentration ◽  
Effects Of Ph ◽  
Hydrolysis Of ◽  
Uptake And Release

On addition of ATP to vesicles derived from the sarcoplasmic reticulum (SR) of skeletal muscle, Ca2+ is accumulated from the external medium. Following uptake, spontaneous release of Ca2+ occurs in the presence or in the absence of ATP. These processes of Ca2+ uptake and release were simulated by using the models derived for ATPase activity [Gould, East, Froud, McWhirter, Stefanova & Lee (1986) Biochem. J. 237, 217-227; Stefanova, Napier, East & Lee (1987) Biochem. J. 245, 723-730] and for Ca2+ release from passively loaded vesicles [McWhirter, Gould, East & Lee (1987) Biochem. J. 245, 713-722]. The simulations are consistent with measurements of the effects of pH, K+, Ca2+ and Mg2+ on uptake and release of Ca2+. The increase in maximal Ca2+ accumulation observed in the presence of maleate is explained in terms of complexing of Ca2+ and maleate within the SR. The calculated concentration of ADP generated by hydrolysis of ATP has a large effect on the simulations. The effects of an ATP-regenerating system on the measured Ca2+ uptake is explained in terms of both removal of ADP and precipitation of Ca3(PO4)2 within the vesicles. It is concluded that both the process of Ca2+ uptake and the process of Ca2+ release seen with SR vesicles can be interpreted quantitatively in terms solely of the properties of the Ca2+ + Mg2+-activated ATPase.

Development of Adsorbent from Banana Peel for Wastewater Treatment

2012 ◽  
Vol 248 ◽  
pp. 310-315 ◽  
Author(s):  
Jimoh Abdulfatai ◽  
Abdulkareem Ambali Saka ◽  
Ayo Samuel Afolabi ◽  
Onazi Micheal
Keyword(s):  
Particle Size ◽  
Contact Time ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Environmental Water ◽  
Sorption Process ◽  
Zinc Ion ◽  
Banana Peel ◽  
Chromium Ion ◽  
Effects Of Ph

This study investigated the development and application of banana peel for the remediation of heavy metals (Pb, Zn and Cr). Batch experimental processes as well as conditions that might influence the sorption of the metals were investigated. These conditions include effects of pH, contact time, adsorbent dose, and particle size. The applicability of the sorption process was tested on wastewater. The adsorbent activated with 0.5 M H2SO4 showed the highest percentage removal of chromium ion (88.9 %) at a pH of 6. It has been found that particle size has no effect on the removal of zinc ion and it has also been found that the removal efficiency of lead and chromium ion decreased with increase in contact time and particle size. Also, it can be seen from the results that untreated banana peel waste increases the biochemical oxygen demand (BOD) and chemical oxygen demand (COD) values of wastewater. The results from the optimized method revealed the applicability of the method to environmental water samples. This study therefore confirms that banana peel is a promising adsorbent for the removal of chromium from industrial effluent.

scholarly journals Cadmium and copper adsorption on bentonite: effects of pH and particle size

2011 ◽  
Vol 42 (2) ◽  
pp. 278-284 ◽  
Author(s):  
Lúcia Helena Garófalo Chaves ◽  
Gilvanise Alves Tit
Keyword(s):  
Particle Size ◽  
Copper Adsorption ◽  
Effects Of Ph
Sign in / Sign up

Export Citation Format

Share Document