scholarly journals Terminal Hydroxyl Groups on Al2O3 Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition

ACS Omega ◽  
2021 ◽  
Author(s):  
Xufei Shao ◽  
Xiaotong Li ◽  
Jinzhu Ma ◽  
Runduo Zhang ◽  
Hong He
Keyword(s):  
Ag Nanoparticles ◽  
Valence State ◽  
Hydroxyl Groups ◽  
Ozone Decomposition

Catalytic Hydroxyl Radical Generation by CuO Confined in Multi-Walled Carbon Nanotubes

2012 ◽  
Vol 557-559 ◽  
pp. 448-455 ◽  
Author(s):  
Fa Min Shi ◽  
Lei Wang ◽  
Si Mo Shi ◽  
Han Fei Zhang ◽  
Chang Qing Dong ◽  
...  
Keyword(s):  
Outer Surface ◽  
Atomic Oxygen ◽  
Metal Oxide Nanoparticles ◽  
Catalytic Ozonation ◽  
Hydroxyl Groups ◽  
Ozone Decomposition ◽  
Heterogeneous Catalytic ◽  
Multi Walled Carbon Nanotubes ◽  
Radical Generation ◽  
Walled Carbon Nanotubes

A DFT study of the catalytic properties of CuO/CNT and CuO@CNT complexes for the heterogeneous catalytic ozonation has been performed. We illustrated the atomistic details of CuO/CNT and CuO@CNT with a quantitative and qualitative discussion within such an electronic structure characteristics. Ozone was catalytically decomposed into an atomic oxygen species and oxygen molecule on both the surface inner and outer CuO@CNT complex, while ozone can only decompose over CuO on the outer surface of CuO/CNT, with partial electrons transfer from CuO/CNT and CuO@CNT complexes to the adsorbate. Then the atomic oxygen reacted with the water molecule to form two hydroxyl groups on the surface, promoting the reaction chain for the generation of•OH which, in turn, lead to an increase in the catalytic ozonation efficiency. Results show synergetic confinement effect of metal oxide nanoparticles inside CNT could also lead to an acceleration of ozone decomposition and the generation of •OH on the inner and outer surface of carbon-nanotube containing catalytic particles.

scholarly journals Correction: Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state

Nanoscale ◽  
2020 ◽  
Vol 12 (27) ◽  
pp. 14927-14927
Author(s):  
Siyu Wang ◽  
Yu-quan Zhu ◽  
Yuhong Zhang ◽  
Binxia Wang ◽  
Hong Yan ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Valence State ◽  
Ozone Decomposition ◽  
Highly Efficient ◽  
Double Hydroxide ◽  
Layered Double Hydroxide Nanoparticles

Correction for ‘Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state’ by Siyu Wang et al., Nanoscale, 2020, 12, 12817–12823, DOI: 10.1039/D0NR02796K.

scholarly journals Terminal Groups-Dependent Near-Field Enhancement Effect of Ti3C2Tx Nanosheets

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Ying-Ying Yang ◽  
Wen-Tao Zhou ◽  
Wei-Long Song ◽  
Qing-Quan Zhu ◽  
Hao-Jiang Xiong ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Near Field ◽  
Field Enhancement ◽  
Electron Injection ◽  
Hybrid Structure ◽  
Enhancement Effect ◽  
Hydroxyl Groups ◽  
Potential Applications ◽  
Physical And Chemical

AbstractBoth multilayered (ML) and few-layered (FL) Ti3C2Tx nanosheets have been prepared through a typical etching and delaminating procedure. Various characterizations confirm that the dominant terminal groups on ML-Ti3C2Tx and FL-Ti3C2Tx are different, which have been assigned to O-related and hydroxyl groups, respectively. Such deviation of the dominant terminals results in the different physical and chemical performance and eventually makes the nanosheets have different potential applications. In particular, before coupling to Ag nanoparticles, ML-Ti3C2Tx can present stronger near-field enhancement effect; however, Ag/FL-Ti3C2Tx hybrid structure can confine stronger near-field due to the electron injection, which can be offered by the terminated hydroxyl groups.

scholarly journals The behavior of ozone on different iron oxides surface sites in water

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Liqiang Yan ◽  
Jishuai Bing ◽  
Hecheng Wu
Keyword(s):  
Iron Oxides ◽  
Lewis Acid ◽  
Acid Sites ◽  
Oh Radicals ◽  
Hydroxyl Groups ◽  
Ozone Decomposition ◽  
Lewis Acid Sites ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Surface Metal

Abstract A transformation process of ozone on different iron oxides suspensions, including α-Fe2O3, α-FeOOH, Fe3O4, was carried out using FTIR of adsorbed pyridine, ATR-FTIR and electron paramagnetic resonance (EPR) spectra with isotope 18O3. It was verified that on the surface isolated hydroxyl groups and the surface hydroxyl groups without acid sites of these iron oxides, ozone was electrostatically adsorbed and did not interact with the surface of these oxides, stably existed as ozone molecule. In contrast, ozone could replace the surface hydroxyl groups on Lewis acid sites of oxides, and directly interacted with the surface metal ions, decomposing into reactive oxygen species (ROS) and initiating the surface metal redox. The results indicate that Lewis acid sites were active center while the electronic cycle of the Fe2+/Fe3+ is advantageous to promote ozone decomposition into O2•− and •OH radicals. The mechanism of catalytic ozonation in different surface acid sites of iron oxides aqueous suspension was proposed on the basis of all experimental information.

Hydroxyl-rich nanoporous carbon nanosheets synthesized by a one-pot method and their application in the in situ preparation of well-dispersed Ag nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 96062-96066 ◽  
Author(s):  
Xiaodi Guo ◽  
Gaili Liu ◽  
Shuang Yue ◽  
Jing He ◽  
Lianying Wang
Keyword(s):  
Ag Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Hydroxyl Groups ◽  
Ag Nps ◽  
One Pot ◽  
Carbon Nanosheets ◽  
In Situ Preparation

Nanoporous carbon nanosheets (CNSs) with high surface area have been synthesized by pyrolysis of organic–inorganic precursor. The CNSs with rich hydroxyl groups display remarkable reactivity and capability for in situ loading ultrafine Ag NPs.

Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalysts with tunable valence state

Nanoscale ◽  
2020 ◽  
Vol 12 (24) ◽  
pp. 12817-12823
Author(s):  
Siyu Wang ◽  
Yu-quan Zhu ◽  
Yuhong Zhang ◽  
Binxia Wang ◽  
Hong Yan ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Valence State ◽  
Ozone Decomposition ◽  
Highly Efficient ◽  
Valence States ◽  
Double Hydroxide ◽  
Catalytic Ozone ◽  
Layered Double Hydroxide Nanoparticles

This paper reported a Mn based layered double hydroxide catalyst with tunable valence state, and the effects of different valence states on catalytic ozone decomposition.

Influence of Mn valence state and characteristic of TiO2 on the performance of Mn–Ti catalysts in ozone decomposition

2017 ◽  
Vol 38 (22) ◽  
pp. 2785-2792 ◽  
Author(s):  
Dong Wook Kwon ◽  
Geo Jong Kim ◽  
Jong Min Won ◽  
Sung Chang Hong
Keyword(s):  
Valence State ◽  
Ozone Decomposition

Catalytic ozonation of p-chloronitrobenzene over pumice-supported zinc oxyhydroxide

2013 ◽  
Vol 68 (8) ◽  
pp. 1895-1900 ◽  
Author(s):  
Lei Yuan ◽  
Jimin Shen ◽  
Zhonglin Chen
Keyword(s):  
Hydroxyl Radicals ◽  
Underlying Mechanism ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Hydroxyl Groups ◽  
Ozone Decomposition ◽  
Surface Hydroxyl ◽  
Heterogeneous Catalytic ◽  
Surface Hydroxyl Groups ◽  
Catalytic Ozone

The catalytic ozonation of p-chloronitrobenzene (pCNB) in an aqueous solution using pumice-supported zinc oxyhydroxide (ZMP) as the catalyst was investigated. ZMP significantly enhanced the degradation efficiency in the heterogeneous catalytic ozonation compared with ozonation alone. The decomposition rate of the aqueous ozone increased 2.84-fold in the presence of ZMP. Catalytic ozone decomposition showed that pCNB is oxidized primarily by hydroxyl radicals (•OH) in ozonation/ZMP processes. This modification increases the density of surface hydroxyl groups as well as the pH at the point of zero charge (pHPZC) of pumice, resulting in the appearance of new ZnO and Zn(OH)2 crystalline phases. An investigation of the underlying mechanism confirms that ZnOOH loading promotes •OH initiation, which enhances the degradation of pCNB.

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