Details
| Original language | English |
|---|---|
| Pages (from-to) | 5134-5141 |
| Number of pages | 8 |
| Journal | Arabian journal of chemistry |
| Volume | 12 |
| Issue number | 8 |
| Early online date | 16 Aug 2016 |
| Publication status | Published - Dec 2019 |
Abstract
The reaction of electrons stored on TiO 2 nanoparticles with heavy metal ions Hg (II), Ni (II) and Pb (II) has been studied employing steady state and stopped flow spectrophotometric techniques. Prior to kinetic investigation the formation of metal deposits is detected by their surface Plasmon absorbance observed after mixing of their corresponding metal ions with stored electron on TiO 2 nanoparticles (e TiO 2 -). The dynamic of transfer of stored TiO 2 electrons to Hg (II), Pb (II) and Ni (II) in water has been investigated after mixing in the stopped flow chamber following the decrease of the absorbance of e TiO 2 - at 600 nm. The results indicate that Hg (II), Pb (II) and Ni (II) ions react readily with e TiO 2 -. The kinetic parameters of the electron transfer reactions have been obtained by pseudo first order fitting. In the presence of Hg (II) ions, the transients decay followed by a buildup at 380–480 nm range. In the presence of Pb (II) and Ni (II), a concurrent decay of TiO 2 electron absorbance and buildup of the absorbance of metal deposits were observed. The rate constants of the electron transfer reactions induced by TiO 2 stored electrons to metal ions increase with the driving force of the reaction according to Tafel equation.
Keywords
- Hazardous metal ions, Kinetics, Mechanism, Stored electrons, TiO nanoparticles
ASJC Scopus subject areas
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In: Arabian journal of chemistry, Vol. 12, No. 8, 12.2019, p. 5134-5141.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Kinetic and mechanistic features on the reaction of stored TiO2 electrons with Hg (II), Pb (II) and Ni (II) in aqueous suspension
AU - Mohamed, Hanan H.
AU - Alomair, Nuhad A.
AU - Bahnemann, Detlef W.
PY - 2019/12
Y1 - 2019/12
N2 - The reaction of electrons stored on TiO 2 nanoparticles with heavy metal ions Hg (II), Ni (II) and Pb (II) has been studied employing steady state and stopped flow spectrophotometric techniques. Prior to kinetic investigation the formation of metal deposits is detected by their surface Plasmon absorbance observed after mixing of their corresponding metal ions with stored electron on TiO 2 nanoparticles (e TiO 2 -). The dynamic of transfer of stored TiO 2 electrons to Hg (II), Pb (II) and Ni (II) in water has been investigated after mixing in the stopped flow chamber following the decrease of the absorbance of e TiO 2 - at 600 nm. The results indicate that Hg (II), Pb (II) and Ni (II) ions react readily with e TiO 2 -. The kinetic parameters of the electron transfer reactions have been obtained by pseudo first order fitting. In the presence of Hg (II) ions, the transients decay followed by a buildup at 380–480 nm range. In the presence of Pb (II) and Ni (II), a concurrent decay of TiO 2 electron absorbance and buildup of the absorbance of metal deposits were observed. The rate constants of the electron transfer reactions induced by TiO 2 stored electrons to metal ions increase with the driving force of the reaction according to Tafel equation.
AB - The reaction of electrons stored on TiO 2 nanoparticles with heavy metal ions Hg (II), Ni (II) and Pb (II) has been studied employing steady state and stopped flow spectrophotometric techniques. Prior to kinetic investigation the formation of metal deposits is detected by their surface Plasmon absorbance observed after mixing of their corresponding metal ions with stored electron on TiO 2 nanoparticles (e TiO 2 -). The dynamic of transfer of stored TiO 2 electrons to Hg (II), Pb (II) and Ni (II) in water has been investigated after mixing in the stopped flow chamber following the decrease of the absorbance of e TiO 2 - at 600 nm. The results indicate that Hg (II), Pb (II) and Ni (II) ions react readily with e TiO 2 -. The kinetic parameters of the electron transfer reactions have been obtained by pseudo first order fitting. In the presence of Hg (II) ions, the transients decay followed by a buildup at 380–480 nm range. In the presence of Pb (II) and Ni (II), a concurrent decay of TiO 2 electron absorbance and buildup of the absorbance of metal deposits were observed. The rate constants of the electron transfer reactions induced by TiO 2 stored electrons to metal ions increase with the driving force of the reaction according to Tafel equation.
KW - Hazardous metal ions
KW - Kinetics
KW - Mechanism
KW - Stored electrons
KW - TiO nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=85009274768&partnerID=8YFLogxK
U2 - 10.1016/j.arabjc.2016.08.001
DO - 10.1016/j.arabjc.2016.08.001
M3 - Article
VL - 12
SP - 5134
EP - 5141
JO - Arabian journal of chemistry
JF - Arabian journal of chemistry
SN - 1878-5352
IS - 8
ER -