Modulation of surface structure and catalytic properties of cerium oxide nanoparticles by thermal and microwave synthesis techniques

He, Jian; Zhou, Lan; Liu, Jie; Lu, Yang; Zou, Ling; Xiang, Junyu; Dong, Shiwu; Yang, Xiaochao

doi:10.1016/j.apsusc.2017.01.149

Cited by 19 publications

(6 citation statements)

References 41 publications

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“…For oxidative stress cell model construction, the cells were seeded on 24-well plates at a density of 1.0 × 10 5 cells per well and cultured for 12 h. After that, the medium was removed, and new medium containing 1.0 mM paraquat was added to the cells. [33] After incubating for 24 h, the cells were stained with 0.1% DCFH-DA at 37 °C for 20 min. The free dye was removed by washing the cells with PBS three times.…”

Section: Ceria Nanoparticle Cell Protection From Oxidative Stressmentioning

confidence: 99%

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

Zou

et al. 2022

ChemNanoMat

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Ceria nanoparticles were classified as nanozymes because they are able to mimic the activities of some natural enzymes such as superoxide dismutase (SOD), catalase, oxidase and photolyase under given conditions. These functions have driven studies to explore the factors that could promote ceria nanoparticle enzyme activities. Accordingly, factors including size, shape, exposed plane and surface coating that could modulate the enzymatic activities of ceria nanoparticles have been explored. In the present study, we investigated the relationship between ceria nanoparticle crystallinity and SOD-like activity. Two groups of ceria nanoparticles with sizes of several nanometers and tens of nanometers in each group were synthesized with different crystallinities. The ceria nanoparticle crystallinities were closely connected to their Ce 3 + /Ce 4 + ratio, where the lower crystallinity resulted in a higher Ce 3 + concentration and vice versa. The catalytic activity evaluation results indicated that the nanoparticles featuring lower crystallinity exhibited higher SOD-like activity even though the nanoparticles had a smaller specific surface area. The crystallinity-dominated SOD-like activity variation could be sensed by cells, as the nanoparticles featuring lower crystallinity could better protect the cells from paraquat-induced oxidative stress. Therefore, decreasing crystallinity could be an effective way to achieve highly active ceria nanoparticles for SOD-related biological applications.

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Section: Ceria Nanoparticle Cell Protection From Oxidative Stressmentioning

confidence: 99%

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

Zou

et al. 2022

ChemNanoMat

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“…There are several types of surface modification such as chemical treatments, synthetic polymer grafts, the ligand exchange technique, among others; modification by chemical treatments may include reactions with metal alkoxides, carboxylic acid epoxides, silane coupling agents, among others; this being a convenient method to avoid the agglomeration of the nanoparticles and thus improve the dispersion [51], to achieve the surface modification of nanoparticles has been used ultrasonic irradiation as a technique that obeys the principles of green chemistry, because it reduces the use of solvents as well as energy. Another benefit of this technique is that the reaction mixture can be heated rapidly and uniformly, resulting in a shorter reaction time and a complete interaction avoiding the production of by-products [53].…”

Section: Nanotechnologymentioning

confidence: 99%

“…The main applications of the nanoparticles of Al 2 O 3 are in drug delivery, in membranes to eliminate pathogenic microorganisms, antimicrobial applications, removal of heavy metals from wastewater, in catalysis and in gas separation processes. On the other hand, the applications of SiO 2 nanoparticles are in biosensing, also serve as a carrier for antimicrobial applications, drug delivery, and tissue engineering [53].…”

Section: Nanotechnologymentioning

confidence: 99%

Applications of Carboxylic Acids in Organic Synthesis, Nanotechnology and Polymers

Sáenz‐Galindo¹,

López²,

Duran³

et al. 2018

Carboxylic Acid - Key Role in Life Sciences

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Carboxylic acids are versatile organic compounds. In this chapter is presented a current overview of the use of carboxylic acids in a different area as organic synthesis, nanotechnology, and polymers. The application carboxylic acids in these areas are: obtaining of small molecules, macromolecules, synthetic or natural polymers, modification surface of nanoparticles metallic, modification surface of nanostructure such as carbon nanotubes and graphene, nanomaterials, medical field, pharmacy, etc. Carboxylic acids can be natural and synthetic, can be extracted or synthesized, presented chemical structure highly polar, active in organic reactions, as substitution, elimination, oxidation, coupling, etc. In nanotechnology, the use of acid carboxylic as surface modifiers to promote the dispersion and incorporation of metallic nanoparticles or carbon nanostructure, in the area of polymer carboxylic acids present applications such monomers, additives, catalysts, etc. The purpose of this chapter is to emphasize the importance of carboxylic acids in different areas, highlighting the area of organic synthesis, nanotechnology and polymers and its applications.

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“…Therefore, it has potential application as a carrier material in catalytic oxidation reactions. However, cerium oxide has a wide band gap and limited absorption of visible light, and its photoelectron generation and hole recombination rates are high, leading to its poor photocatalytic degradation performance [ 8 , 9 ]. Numerous researchers have stated that photocatalytic properties of materials can be improved by improving morphology, crystal plane regulation, substance doping, or heterojunction construction [ 7 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of CeO2/UiO-66-NH2 Heterojunction and Study on a Photocatalytic Degradation Mechanism

et al. 2022

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CeO2/UiO-66-NH2 (marked as Ce/UN) composites were in-situ synthesized by a hydrothermal method. The properties, photocatalytic aspects, and degradation mechanism of Ce/UN were studied carefully. SEM results show that Ce/UN have a 3D flower-like structure, where octahedral UiO-66-NH2 nanoparticles are embedded in the two-dimensional sheet of CeO2. TEM results demonstrate that CeO2 and UiO-66-NH2 are bonded interfacially to constitute a hetero-junction construction. Data obtained by electrochemical impedance spectroscopy and fluorescence spectroscopy established that Ce/UN has less charge shift resistance and luminescence intensity than these of two pure substances. When the ratio of Ce/UN is 1:1, and the calcination temperature 400 °C is used, the degradation efficiency of RhB in photocatalysis by obtained Ce/UN is about 96%, which is much higher than in the case of CeO2 (4.5%) and UiO-66-NH2 (54%). The improved photocatalytic properties of Ce/UN may be due to the formation of hetero-junction, which is conducive for most photo-carriers and thus the interfacial charge shift efficiency is enhanced. By the free radical capture test, it can be inferred that the major active substances involved in the degradation related to photocatalysis is H+ and · O2−.

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Modulation of surface structure and catalytic properties of cerium oxide nanoparticles by thermal and microwave synthesis techniques

Cited by 19 publications

References 41 publications

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

Applications of Carboxylic Acids in Organic Synthesis, Nanotechnology and Polymers

Preparation of CeO2/UiO-66-NH2 Heterojunction and Study on a Photocatalytic Degradation Mechanism

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