A novel strategy for green synthesis of colloidal porphyrins/silver nanocomposites by Sesbania sesban plant and their catalytic application in the clean oxidation of alcohols
“…They investigated its catalytic performance for the Suzuki coupling reaction and obtained a high yield and recyclability of about six times. Naeimi et al., synthesised the functional Ag/ porphyrins using Sesbania sesban plant extract. They used manganese porphyrin amphiphiles as a template for the Ag nanoparticles, which existed in the size of 15 nm.…”
Section: Phytochemical Fabrication Of Functional Nanostructuresmentioning
The bioreduction process, that utilizes the plant extracts, have been explored extensively as a green chemical route for the synthesis of metal nanoparticles due to their eco-friendly protocol as well as versatility in the selection of various plant resources. Recent advances in this plant extract mediated biological process are the fabrication of functional nanostructures. Bioreduction mechanism catalyzes the combining process of metal nanoparticles with other kind of materials including metal, metal oxides, cellulosic, zeolite and carbon nanomaterials. Integrating metal nanoparticles with various materials offers new functional properties and improves their performance comparing to their pristine counterpart. In this review, plant-based biochemical substances, which influence the metal ion into metal and their controlled nucleation on the surface of other kinds of materials are highlighted, and the future prospect of this bio-based synthesis of functional nanostructures are discussed.[a] M. Hariram, Dr. S. Vivekanandhan
“…They investigated its catalytic performance for the Suzuki coupling reaction and obtained a high yield and recyclability of about six times. Naeimi et al., synthesised the functional Ag/ porphyrins using Sesbania sesban plant extract. They used manganese porphyrin amphiphiles as a template for the Ag nanoparticles, which existed in the size of 15 nm.…”
Section: Phytochemical Fabrication Of Functional Nanostructuresmentioning
The bioreduction process, that utilizes the plant extracts, have been explored extensively as a green chemical route for the synthesis of metal nanoparticles due to their eco-friendly protocol as well as versatility in the selection of various plant resources. Recent advances in this plant extract mediated biological process are the fabrication of functional nanostructures. Bioreduction mechanism catalyzes the combining process of metal nanoparticles with other kind of materials including metal, metal oxides, cellulosic, zeolite and carbon nanomaterials. Integrating metal nanoparticles with various materials offers new functional properties and improves their performance comparing to their pristine counterpart. In this review, plant-based biochemical substances, which influence the metal ion into metal and their controlled nucleation on the surface of other kinds of materials are highlighted, and the future prospect of this bio-based synthesis of functional nanostructures are discussed.[a] M. Hariram, Dr. S. Vivekanandhan
“…CYP450 and their biomimetic model compounds have attracted great attention due to their superior performance in the oxidation of a wide range of alcohols under mild conditions [8–11] . Catalyst decomposition and lack of catalyst recovery as the major intrinsic drawback of homogeneous catalytic systems led scientists to convert homogeneous into heterogenized catalysts via solid supports [12–15] …”
In the present research, a new method for the aerobic oxidation of aromatic and cyclic aliphatic alcohols to the corresponding aldehydes or ketone was developed in the presence of two supported metalloporphyrins. The prepared heterogenized catalysts were fully characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), thermogravimetric analysis (TGA), atomic absorption spectroscopy (AAS), Fourier Transform Infrared (FT‐IR) and Ultra Violet‐Visible (UV‐Vis) spectroscopy. The role of structural and textural properties of carbon‐based materials as solid support on the catalytic efficiency of the supported catalysts was compared with each other and the results shows higher efficiency of the supported Fe‐porphyrin on multi‐walled carbon nanotube [Fe(THPP)Cl/MWCNT] compared to the anchored Fe‐porphyrin on the graphene oxide [Fe(THPP)Cl/GO]. The study on the aerobic oxidation of alcohols in the presence of the supported Fe‐porphyrins proved that the addition of isobutyraldehyde as reducing agent in several portions during the catalytic reaction significantly increased the product yields. The separation and recovery of the nanocatalyst was simple, effective and economical in this green oxidation method and the supported catalyst can reuse at least eight times without significant loss of activity.
“…Hence, the preparation of nanocolloid composites special metal matrix composites using natural substrates such as plants is becoming popular and attractive day by day to minimum or no use of harmful chemicals [13]. These methods are not only eco-friendly but also less time consuming, cost effective, stable operation, efficient and safer [14][15][16][17][18][19]. Among plants, weeds are plants that grow where they are not wanted and are therefore bad news to crop farmers.…”
In this paper, the first bio-nano colloid including manganese oxide nanoparticles and copper nanocomplex in the presence of Amaranthus spinosus as one unwanted plant was prepared (Mn 3 O 4 /CuL bio-nanocolloid). As-prepared bio nanocolloid was analysed completely by different techniques such as FT-IR, ICP-AES, SEM, EDX, TEM and elemental analysis to have the size, structure, morphology and elements in this compound. This bio-nanocolloid showed high catalytic activity towards green oxidation reactions of alcohols using hydrogen peroxide under solvent free conditions. The longevity, easy and practical recoverability of the solid catalyst was also confirmed for six times. The natural starting material for a long-term stability catalyst preparation, using ideal oxidant (H 2 O 2), solventless and easy work up show the great potential in scalability for actual industries applications.
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