In situ intercalation of Au nanoparticles and magnetic γ-Fe2O3 in the walls of MCM-41 with abundant void defects for highly efficient reduction of 4-nitrophenol and organic dyes

Zhou, Shijian; Jin, Weiming; Ding, Yun; Shao, Bo; Wang, Bangbang; Hu, Xu; Kong, Yan

doi:10.1039/c8dt03054e

Cited by 21 publications

(11 citation statements)

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“…The importance of nitroreductase enzymes to produce activate prodrugs,remediate pollutants and generate building‐blocks for high‐value pharmaceuticals have attracted considerable attention of researchers in the artificial enzymes field. Moreover, various advanced nanocatalysts were developed for the reduction of 4‐ nitrophenol based on immobilization of metal nanoparticles on different supporting materials such as metal–organic frameworks, biohydrogels, mesoporous silica materials and core–shell magnetic materials …”

Section: Figurementioning

confidence: 99%

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

et al. 2019

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The nitroreductases are a family of natural enzymes with great importance. Inspired the integration of biology and nanotechnology, herein, a rational design for the preparation of the platinum(II)-based artificial nitroreductase is reported. Engineering the individual ligand scaffold, which on the one hand could form a highly stable complex with the platinum(II) as the catalytic active site and on the other hand could provide halogen bonding site for induce catalysis by approximation, creates an efficient and long-term resistance artificial nitroreductase. The platinum(II)-based artificial nitroreductase was characterized by FTIR, TEM, XRD, EDAX and ICP techniques. The reaction conditions were fully optimized for the reduction of high concentration p-nitrophenol as a specific substrate in aqueous solution employing experimental design, which highlights the potential application of the designed artificial nitroreductase in wastewater treatment. Moreover, the enzyme-like Michaelis-Menten kinetics of the reaction was investigated. The prepared platinum(II)-based artificial nitroreductase could be stable even after 20 catalytic cycles with excellent activity and it was represented a good turnover frequency.Nanomaterials with similar functions to those of proteins and their higher stability and lower cost are regarded as an important class of artificial enzymes known as "nanozymes". [1] Considering some practical limitations of natural enzymes, such as ease of denaturation, laborious preparation, high cost, and difficulty of recycling, the design and construction of efficient and stable nanozymes is highly desirable. [1b] The importance of nitroreductase enzymes to produce activate prodrugs, [2] remediate pollutants [3] and generate building-blocks for high-value pharmaceuticals [4] have attracted considerable attention of researchers in the artificial enzymes field. Moreover, various advanced nanocatalysts were developed for the reduction of 4nitrophenol based on immobilization of metal nanoparticles on different supporting materials such as metal-organic frameworks, [5] biohydrogels, [6] mesoporous silica materials [7] and core-shell magnetic materials. [8] In this regard and also as a part of our ongoing research program on the design of new nanocatalyst, [9] we have therefore constructed a rationally designed platinum(II)-based artificial nitroreductase for the reduction of 4-nitrophenol as a model substrate by sodium borohydride in aqueous solution.Halogen bonds are known as the highly directional and specific non-covalent interaction [10] in biological molecules, particularly in natural enzymes that can affect their stability and activity. [11] Inspiriting the important role of halogen bond in substrate selectivity of enzymatic catalysis, engineering the halogen interactions offer new and versatile tools for the rational design of supramolecular scaffolds [12] in artificial enzymes technology.The rational design of ligands lies at the heart of transitionmetal catalysis because of their critical roles in the...

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Section: Figurementioning

confidence: 99%

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

et al. 2019

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“…The energy crisis and environmental pollution are two classic problems in today's world, which must be resolved in the near future. [1][2][3] And new clean renewable energy sources play signicant roles in addressing the solution of these two major problems. [4][5][6][7][8] According to the literature, solar energy has attracted widespread attention, possessing the advantages of being clean, non-polluting, widely distributed, and abundant in reserves.…”

Section: Introductionmentioning

confidence: 99%

Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO₂ microsphere photocatalysts

Sun

Yang

et al. 2019

RSC Adv.

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“…This paper focused on MMS from rice husk ash for removal of AFB1 in oil, compared with other similar studies. Furthermore, this magnetic mesoporous material can be applied for removal of mycotoxins (AFB1 [41] and ochratoxin A [21]), toxic metals (Hg [19], Cd 2+ [52], Cu, and Co [53]), dyes (methyl blue [25,26]), pesticides (pyrethroid [54]), pharmaceuticals (minocycline [17]), and other emerging pollutants [40], and may be suitable for drug delivery [55] in the future.…”

Section: Calculation Of the Apparent Thermodynamic Parameters For Afbmentioning

confidence: 99%

“…In the two-step method, MS and magnetic particles were combined in a certain way to obtain MMS. Using tetraethyl orthosilicate (TEOS) as the silica source, MMS was prepared via an in situ method using iron nitrate [17] or Fe 3 O 4 particles [18,19]. MMS was a composite material with both a large surface area and abundant MS active sites with the advantage of easy separation of magnetic material [20,21], and thus had high application value for removal of mycotoxins from liquid foodstuffs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of magnetic mesoporous silica from rice husk for aflatoxin B1 removal: Optimum process and adsorption mechanism

Ren

Chen

et al. 2020

PLoS ONE

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The liquid foodstuffs such as edible oil products remain a problem of excessive aflatoxin B1 (AFB1) content. This paper focused on the preparation of magnetic mesoporous silica (MMS) from rice husk ash for the removal of AFB1 in oil system. The MMS preparation process, adsorption conditions, structural characteristics, and adsorption mechanism were investigated. The optimum conditions for MMS preparation were pH 11.0 and 80˚C for 24 h. The characterization results showed that magnetic particles were successfully embedded in the MMS and had high responsiveness to a magnetic field, which was advantageous for recyclability. The MMS had ordered uniform channels with a specific surface area of 730.98 m 2 /g and pore diameter of 2.43 nm. The optimum adsorption conditions were 2 h at 20˚C. For AFB1 with an initial concentration of 0.2 μg/mL, the MMS adsorption capacity was 171.98 μg/g and the adsorption rate was 94.59%. The MMS adsorption isotherm fitted the Langmuir model well under the assumption of monolayer AFB1 adsorption with uniformly distributed adsorption sites on the MMS surface. The maximum amount of AFB1 adsorbed according to the Langmuir isotherm was 1118.69 μg/g. A quasi-second-order kinetic model gave a better fit to the process of AFB1 adsorption on MMS. The values of ΔH (−19.17 kJ/ mol) and ΔG (−34.09, −34.61, and −35.15 kJ/mol at 283, 293, and 303 K, respectively) were negative, indicating that AFB1 adsorption on MMS was a spontaneous exothermic process. The results indicated that MMS was a promising material for AFB1 removal in oil system, and this study will serve as a guide for practical MMS applications.

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In situ intercalation of Au nanoparticles and magnetic γ-Fe₂O₃ in the walls of MCM-41 with abundant void defects for highly efficient reduction of 4-nitrophenol and organic dyes

Abstract: Au nanoparticles and magnetic γ-Fe2O3 are intercalated in situ in the walls of MCM-41, and abundant void defects appeared during the assembly process.

Cited by 21 publications

References 60 publications

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO₂ microsphere photocatalysts

Preparation of magnetic mesoporous silica from rice husk for aflatoxin B1 removal: Optimum process and adsorption mechanism

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In situ intercalation of Au nanoparticles and magnetic γ-Fe2O3 in the walls of MCM-41 with abundant void defects for highly efficient reduction of 4-nitrophenol and organic dyes

Abstract: Au nanoparticles and magnetic γ-Fe2O3 are intercalated in situ in the walls of MCM-41, and abundant void defects appeared during the assembly process.

Cited by 21 publications

References 60 publications

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

Pt(II)‐Based Artificial Nitroreductase: An Efficient and Highly Stable Nanozyme

Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO2 microsphere photocatalysts

Preparation of magnetic mesoporous silica from rice husk for aflatoxin B1 removal: Optimum process and adsorption mechanism

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In situ intercalation of Au nanoparticles and magnetic γ-Fe₂O₃ in the walls of MCM-41 with abundant void defects for highly efficient reduction of 4-nitrophenol and organic dyes

Homojunction and defect synergy-mediated electron–hole separation for solar-driven mesoporous rutile/anatase TiO₂ microsphere photocatalysts