Rational design of efficient visible-light driven photocatalyst through 0D/2D structural assembly: Natural kaolinite supported monodispersed TiO2 with carbon regulation

Li, Chunquan; Dong, Xiongbo; Zhu, Ningyuan; Zhang, Xiangwei; Yang, Shanshan; Sun, Zhiming; Liu, Yangyu; Zheng, Shuilin; Dionysiou, Dionysios D.

doi:10.1016/j.cej.2020.125311

Cited by 36 publications

(18 citation statements)

References 59 publications

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“…Such unique 3D architecture creates abundant open space and active sites, which ensure the adsorption and activation of CO and O 2 . In addition, nanoflakes possess superior catalytic performance and thermal stability after calcination compared to catalysts with irregular shapes due to high aspect ratios, which can restrict the diffusion of atoms at high temperatures, thus preventing sintering . This can be the possible reason that Kln/Mn maintained high catalytic activity after calcination.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, nanoflakes possess superior catalytic performance and thermal stability after calcination compared to catalysts with irregular shapes due to high aspect ratios, which can restrict the diffusion of atoms at high temperatures, thus preventing sintering. 21 This can be the possible reason that Kln/Mn maintained high catalytic activity after calcination. Moreover, these characteristics provide a favorable condition for subsequent loading of metal oxides (e.g., Cu, Ce, Co, etc.)…”

Section: Materials Characterizationmentioning

confidence: 99%

“…Kaolinite exhibits relatively high reactivity toward chemical modification due to the presence of surface hydroxyl groups. These hydroxyl groups can form chemical bonds with nanoparticles to generate stable hybrid structures. , …”

Section: Introductionmentioning

confidence: 99%

“…These hydroxyl groups can form chemical bonds with nanoparticles to generate stable hybrid structures. 21,22 In addition, various catalyst synthesis strategies have also been developed to prepare ultrathin MnO 2 , such as hydrothermal, microwave-assisted, and biomimetic methods. 23 Biomimetic synthesis is famous for the precise control of nanomaterials via simulating the structure/morphology of a natural organism.…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Liu

Wang

Han

et al. 2022

ACS Appl. Mater. Interfaces

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Highly efficient three-dimensional (3D) kaolinite/MnO2–CuO (KM@CuO–NO3) catalysts were synthesized by a mild biomimetic strategy. Kaolinite flakes were uniformly wrapped by ultrathin tremelliform MnO2 nanosheets with thicknesses of around 1.0–1.5 nm. Si–O and Al–O groups in kaolinite hosted MnO2 nanosheets to generate a robust composite structure. The ultrathin MnO2 lamellar structure exhibited excellent stability even after calcination above 350 °C. Kaolinite/MnO2 exhibited abundant edges, sharp corners, and interconnected diffusion channels, which are superior to the common stacked structure. Open channels guaranteed fast transportation and migration of CO and O2 during CO oxidation. The synthesized KM@CuO–NO3 achieved a 90% CO conversion efficiency at a relatively low temperature (110 °C). Furthermore, the abundant oxygen vacancies on KM@CuO-NO3 assisted the adsorption and activation of oxygen species and thus enhanced the oxygen mobility and reactivity in the catalytic process. The mechanism results suggest that CuO introduced to the catalyst not only acted as CO active sites but also weakened the Mn–O bond, subsequently improved the mobilities of the oxygen species, which was found to contribute to its high activity for CO oxidation. This study provides new conceptual insights into rationally regulating structural assembly between transition metal oxides and natural minerals for high-performance catalysis reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Materials Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Liu

Wang

Han

et al. 2022

ACS Appl. Mater. Interfaces

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“…The surface morphology of pristine clay minerals was observed by scanning electron microscopy (SEM), as presented in Figure . Kaol (Figure a) shows pseudo-hexagonal platelike and booklet agglomerates, , while Mt (Figure b) and Bent (Figure c) are in aggregated and coarse morphology. , In contrast, Sep (Figure d) portrays a fibrous characteristic, which can aggregate into bundles. , Decoration of the clay minerals with gold nanoparticles (clay/AuNPs) was achieved primarily by grafting APTES on the clay surfaces (clay/APTES), followed by adsorption and reduction of the gold precursors. The dark spots in the TEM images (insets of Figure ) show well-dispersed gold nanoparticles on the clay structures.…”

Section: Resultsmentioning

confidence: 99%

Biosensors Based on Acetylcholinesterase Immobilized on Clay–Gold Nanocomposites for the Discrimination of Chlorpyrifos and Carbaryl

et al. 2022

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This work aims at evaluating a utilization of diverse clay mineral/gold nanoparticles/acetylcholinesterase (clay/ AuNPs/AChE) biosensors by using principal component analysis (PCA) for the discrimination of pesticide types and their concentration levels both in the synthetic and real samples. Applications of simple and low-cost clay/AuNP composites of different characteristics as modified-electrode materials are highlighted. Four types of clay minerals, namely, platelike kaolinite (Kaol: 1:1 aluminum phyllosilicate), globular montmorillonite (Mt: 2:1 aluminum phyllosilicate), globular bentonite (Bent: 2:1 aluminum phyllosilicate), and fibrous sepiolite (Sep: 2:1 inverted ribbons of magnesium phyllosilicate), were selected as the base materials. Due to the distinct characteristics of the selected clay, the derived clay/AuNP composites resulted in different physical morphologies, AuNP sizes and loadings, matrix hydrophobicity, and active AChE loading per electrode. These, in turn, caused divergent electrochemical responses for the pesticide determination; hence, no other enzymes apart from AChE were necessary for the fabrication of distinct biosensors. Physical and chemical characterizations of clay/AuNPs were conducted using scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy techniques. The electrochemical information was recorded by cyclic voltammetry and amperometry techniques. The enzyme inhibition results obtained from the pesticides were treated and used as input data to obtain PCA results. The four fabricated clay/AuNPs/AChE biosensors were able to discriminate chlorpyrifos and carbaryl and their concentration levels for synthetic pesticides and real samples. It was disclosed that a high enzyme inhibition and a high hydrophobic modified-electrode material affect a highly sensitive pesticide biosensor. The hydrophobic/hydrophilic character of the modified-electrode material plays a major role in discriminating the pesticide types and their concentration levels by the proposed single-enzyme sensor system. The PCA results illustrated that PC2 described the different types of pesticides, and PC1 showed the level of pesticide concentration with high first two principal components. The mixed pesticides could be identified at an especially low total concentration of 0.5 ng/mL in real samples.

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Nanoclay Mediated Self‐Promoted Reactive Oxygen Species Releasing Enables Efficient Antimicrobial

Ji,

Yu,

Wang

et al. 2024

Adv Funct Materials

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Reactive oxygen species (ROS) releasing materials are increasingly used in nanomedicines due to their effectiveness against a broad spectrum of microbes. However, most ROS‐releasing materials rely on external stimuli such as photoirradiation, either through photodynamic or photocatalytic processes, which limits their practical applications. Herein, this work presents a novel nanoclay mediated self‐promoted ROS releasing material called oxygen vacancies‐rich ZnO/kaolinite (Ov‐rich ZnO/Kaol). Both experiments and density functional theory (DFT) calculations reveal that the introduction of kaolinite increases the content of Ov in ZnO, and the change in the electronic structure promotes the process of oxygen adsorption and activation, resulting in the generation of ·O2−through oxygen reduction without photoirradiation. Molecular dynamics simulations confirm that Ov enhances the interaction between the material and bacterial membrane, promoting the bacterial‐killing effect of ·O2−. More importantly, Ov‐rich ZnO/Kaol is successfully prepared on a pilot scale and used to manufacture antibacterial gauze, which showed at least 99% antibacterial activity against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) in the absence of light. The as‐prepared material also exhibited satisfactory biocompatibility and biosafety. This method can offer a more benign approach to address the limitations of traditional photoirradiation‐dependent photosensitizers for antimicrobial gauze.

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Rational design of efficient visible-light driven photocatalyst through 0D/2D structural assembly: Natural kaolinite supported monodispersed TiO2 with carbon regulation

Cited by 36 publications

References 59 publications

Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Biosensors Based on Acetylcholinesterase Immobilized on Clay–Gold Nanocomposites for the Discrimination of Chlorpyrifos and Carbaryl

Nanoclay Mediated Self‐Promoted Reactive Oxygen Species Releasing Enables Efficient Antimicrobial

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Rational design of efficient visible-light driven photocatalyst through 0D/2D structural assembly: Natural kaolinite supported monodispersed TiO2 with carbon regulation

Cited by 36 publications

References 59 publications

Biomimetic Tremelliform Ultrathin MnO2/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Biomimetic Tremelliform Ultrathin MnO2/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Biosensors Based on Acetylcholinesterase Immobilized on Clay–Gold Nanocomposites for the Discrimination of Chlorpyrifos and Carbaryl

Nanoclay Mediated Self‐Promoted Reactive Oxygen Species Releasing Enables Efficient Antimicrobial

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Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO

Biomimetic Tremelliform Ultrathin MnO₂/CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO