التفاصيل البيبلوغرافية
| العنوان: |
Adsorption dynamics of benzene derivatives onto the surface of hydroxylated silica upon photoexcitation: Effect of halogen and methyl substituents. |
| المؤلفون: |
Yang, Yonggang, Zhao, Min, Liu, Yang, Guan, Tiantian, Liu, Yufang |
| المصدر: |
Journal of Applied Physics; 8/28/2023, Vol. 134 Issue 8, p1-9, 9p |
| مصطلحات موضوعية: |
PHOTOEXCITATION, BENZENE derivatives, ADSORPTION (Chemistry), BOND strengths, ELECTRON density, POISONS |
| مستخلص: |
Adsorption of toxic substances is an important research field. In this work, the adsorption dynamics of halogenated and methylated benzenes onto hydroxylated silica upon photoexcitation has been investigated theoretically. The intermolecular interaction between the hydroxy (OH) group and the π electron density at the center of the benzene ring was also a major subject. In the ground state, the order of calculated adsorption energy was consistent with the OH⋅⋅⋅C bond strengths (SiO2–MeBe > SiO2–DimeBe > SiO2–BrBe > SiO2–ClBe > SiO2–FBe > SiO2–Be), implying this bond to be the major contributor to the adsorption. Upon photoexcitation to the first excited (S1) state by adsorbing shortwave-ultraviolet (UV), the OH⋅⋅⋅C bonds in each complex were strengthened with only the order of the bond strengths of SiO2–DimeBe and SiO2–MeBe reversed relative to the order in the ground state. In contrast to OH⋅⋅⋅C bonds, the OH⋅⋅⋅π bonds were all indicated to weaken upon photoexcitation. The results showed that the order of OH⋅⋅⋅π bond strengths in the S1 state to be SiO2–FBe > SiO2–BrBe > SiO2–DimeBe > SiO2–Be > SiO2–ClBe > SiO2–MeBe. However, the change in the corresponding adsorption energy was inconsistent with the order of OH⋅⋅⋅C bond strengths in the S1 state, due to the degree of weakening of the OH⋅⋅⋅π bond being greater than the degree of strengthening of the OH⋅⋅⋅C bonds. These changes were concluded to be induced by local excitation for each of the six complexes. This work has presented the photophysical dynamics of an adsorbent before and after photoexcitation. [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Find this article in full text from Scitation.