Self-evolved hydrogen peroxide boosts photothermal-promoted tumor-specific nanocatalytic therapy

2019 ◽  
Vol 7 (22) ◽  
pp. 3599-3609 ◽  
Author(s):  
Shanshan Gao ◽  
Xiangyu Lu ◽  
Piao Zhu ◽  
Han Lin ◽  
Luodan Yu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fenton Reaction ◽  
Rational Design ◽  
Tumor Therapy ◽  
Two Dimensional ◽  
Highly Efficient

Highly efficient nanocatalytic tumor therapy has been achieved by in situ self-supplied H2O2-triggered and photothermally-promoted Fenton reaction by the rational design of two-dimensional composite nanoreactors.

Experimental and Modelling Approach for the Comparison of Fenton and Electro-Fenton Processes. Preliminary Results

2006 ◽  
Vol 9 (1) ◽  
Author(s):  
Truong Giang Le ◽  
Alain Bermond
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Organic Compounds ◽  
Fenton Reaction ◽  
Experimental Approach ◽  
Fenton Process ◽  
Iron Salt ◽  
Preliminary Results ◽  
Modelling Approach

AbstractThe Electro-Fenton is one of the processes based on the Fenton reaction, which have been investigated to improve the efficiency of classical Fenton treatment. The Electro-Fenton has been shown to be efficient in the degradation of many organic compounds. However, generally there is no true estimation of its efficiency compared to that of the classical Fenton process. This study aimed to compare the two processes using an experimental approach and modelling. First of all, degradation of hydrogen peroxide (externally applied) was studied. It was shown that the Electro-Fenton process needs smaller quantities of iron (5 times less) than the Fenton to decompose the same quantity of hydrogen peroxide. The Electro-Fenton process may also produce hydrogen peroxide in situ (oxygen reduction). This leads to an important reduction in the consumption of chemicals (hydrogen peroxide, small quantities of iron salt). Finally, a study of the degradation of phenol, when hydrogen peroxide was electrogenerated has shown the greater efficiency of Electro-Fenton compared to the Fenton process.

In situ polydopamine-assisted deposition of silver nanoparticles on a two dimensional support as an inexpensive and highly efficient SERS substrate

RSC Advances ◽  
2015 ◽  
Vol 5 (46) ◽  
pp. 36368-36373 ◽  
Author(s):  
Peilan Wang ◽  
Yanling Zhou ◽  
Ying Wen ◽  
Feng Wang ◽  
Haifeng Yang
Keyword(s):  
Silver Nanoparticles ◽  
Sers Substrate ◽  
Two Dimensional ◽  
Highly Efficient

Versatile substrates were modified with polydopamine followed by in situ AgNP deposition to fabricate a cheap, flexible and disposable SERS substrate.

scholarly journals In situ imaging of two-dimensional surface growth reveals the prevalence and role of defects in zeolite crystallization

2020 ◽  
Vol 117 (46) ◽  
pp. 28632-28639
Author(s):  
Madhuresh K. Choudhary ◽  
Rishabh Jain ◽  
Jeffrey D. Rimer
Keyword(s):  
Silica Nanoparticles ◽  
Rational Design ◽  
Surface Defects ◽  
Surface Growth ◽  
Two Dimensional ◽  
Crystal Surfaces ◽  
Structure Directing Agent ◽  
Layered Growth

Zeolite crystallization predominantly occurs by nonclassical pathways involving the attachment of complex (alumino)silicate precursors to crystal surfaces, yet recurrent images of fully crystalline materials with layered surfaces are evidence of classical growth by molecule attachment. Here we use in situ atomic force microscopy to monitor three distinct mechanisms of two-dimensional (2D) growth of zeolite A where we show that layer nucleation from surface defects is the most common pathway. Direct observation of defects was made possible by the identification of conditions promoting layered growth, which correlates to the use of sodium as an inorganic structure-directing agent, whereas its replacement with an organic results in a nonclassical mode of growth that obscures 2D layers and markedly slows the rate of crystallization. In situ measurements of layered growth reveal that undissolved silica nanoparticles in the synthesis medium can incorporate into advancing steps on crystal surfaces to generate defects (i.e., amorphous silica occlusions) that largely go undetected in literature. Nanoparticle occlusion in natural and synthetic crystals is a topic of wide-ranging interest owing to its relevance in fields spanning from biomineralization to the rational design of functional nanocomposites. In this study, we provide unprecedented insight into zeolite surface growth by molecule addition through time-resolved microscopy that directly captures the occlusion of silica nanoparticles and highlights the prevalent role of defects in zeolite crystallization.

Titanate nanosheets as highly efficient non-light-driven catalysts for degradation of organic dyes

2015 ◽  
Vol 51 (54) ◽  
pp. 10847-10849 ◽  
Author(s):  
Chenjuan Zhou ◽  
Junjie Luo ◽  
Qinqin Chen ◽  
Yinzhi Jiang ◽  
Xiaoping Dong ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Dyes ◽  
Two Dimensional ◽  
Highly Efficient ◽  
Titanate Nanosheets

A novel non-light-driven catalysis by the delaminated two dimensional titanate nanosheets (TNSs) has been explored for degradation of organic dyes with hydrogen peroxide (H2O2).

Preparation of Organic‐Free Two‐Dimensional Kaolinite Nanosheets by In Situ Interlayer Fenton Reaction

2019 ◽  
Vol 4 (39) ◽  
pp. 11604-11608
Author(s):  
Tong Liu ◽  
Hao Qu ◽  
Jiaxin Tian ◽  
Sihui He ◽  
Yue Su ◽  
...  
Keyword(s):  
Fenton Reaction ◽  
Two Dimensional

scholarly journals Simultaneous in situ generation of hydrogen peroxide and Fenton reaction over Pd–Fe catalysts

2010 ◽  
Vol 12 (44) ◽  
pp. 14673 ◽  
Author(s):  
Mohammad S. Yalfani ◽  
Sandra Contreras ◽  
Jordi Llorca ◽  
Montserrat Dominguez ◽  
Jesus E. Sueiras ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fenton Reaction ◽  
Fe Catalysts ◽  
In Situ Generation

A Systematic DFT Study of Two Elementary Steps Involving Hydrogen Peroxide and the Hydroxyl Radical in the Fenton Reaction

2018 ◽  
Author(s):  
Danilo Carmona ◽  
David Contreras ◽  
Oscar A. Douglas-Gallardo ◽  
Stefan Vogt-Geisse ◽  
Pablo Jaque ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Ab Initio ◽  
Fenton Reaction ◽  
Basis Set ◽  
Basis Sets ◽  
Dft Methods ◽  
Elementary Steps ◽  
Oxygen Oxygen ◽  
Complete Basis Set

The Fenton reaction plays a central role in many chemical and biological processes and has various applications as e.g. water remediation. The reaction consists of the iron-catalyzed homolytic cleavage of the oxygen-oxygen bond in the hydrogen peroxide molecule and the reduction of the hydroxyl radical. Here, we study these two elementary steps with high-level ab-initio calculations at the complete basis set limit and address the performance of different DFT methods following a specific classification based on the Jacob´s ladder in combination with various Pople's basis sets. Ab-initio calculations at the complete basis set limit are in agreement to experimental reference data and identified a significant contribution of the electron correlation energy to the bond dissociation energy (BDE) of the oxygen-oxygen bond in hydrogen peroxide and the electron affinity (EA) of the hydroxyl radical. The studied DFT methods were able to reproduce the ab-initio reference values, although no functional was particularly better for both reactions. The inclusion of HF exchange in the DFT functionals lead in most cases to larger deviations, which might be related to the poor description of the two reactions by the HF method. Considering the computational cost, DFT methods provide better BDE and EA values than HF and post--HF methods with an almost MP2 or CCSD level of accuracy. However, no systematic general prediction of the error based on the employed functional could be established and no systematic improvement with increasing the size in the Pople's basis set was found, although for BDE values certain systematic basis set dependence was observed. Moreover, the quality of the hydrogen peroxide, hydroxyl radical and hydroxyl anion structures obtained from these functionals was compared to experimental reference data. In general, bond lengths were well reproduced and the error in the angles were between one and two degrees with some systematic trend with the basis sets. From our results we conclude that DFT methods present a computationally less expensive alternative to describe the two elementary steps of the Fenton reaction. However, choice of approximated functionals and basis sets must be carefully done and the provided benchmark allows a systematic validation of the electronic structure method to be employed

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