Method for preparing triangular palladium nanosheet by using phyteral extracting solution through reduction

Abstract

A method for preparing a triangular palladium nanosheet by using a phyteral extracting solution through reduction relates to a nanosheet. The method includes: washing, drying, smashing and filtering phyteral leaves to obtain phyteral leaf powder, dispersing the phyteral left powder in water, boiling or shaking, suction filtering, removing solid residues to obtain the phyteral extracting solution; and preparing a Pd polymeric precursor solution, mixing with the phyteral extracting solution, adding NaOH, and shaking to obtain the triangular palladium nanosheet after a reduction reaction. The side length of the obtained triangular palladium nanosheet ranges from 10-100 nm, and the triangular palladium nanosheet is good in dispersibility in water, can be used as an activity substrate of a surface raman reaction, and has a certain potential application value in the aspects of pharmacy and optics. The method is simple and mild in reaction condition, does not require an extra protecting agent or reduction agent, and the synthesized triangular palladium nanosheet is good in dispersability in water and high in stability.

Description

technical field [0001] The invention relates to a nanometer sheet, in particular to a method for preparing a triangular palladium nanometer sheet by reduction with a plant extract. Background technique [0002] In recent years, with the continuous rise of nanotechnology, the preparation of nanoparticles has attracted widespread attention. Precious metals have always been a hot spot in the field of nanometers due to their unique properties in the fields of optics, electricity, and medicine. As one of the common noble metals, palladium has been widely used in hydrogen storage materials, conductive pastes, heterogeneous catalytic materials, etc. due to its own characteristics. Especially in terms of catalysis, palladium nanoparticles are widely used as the main catalyst for the low-temperature reduction of automobile exhaust and the catalyst for reactions such as Suzuki coupling. For nanoparticles, the apparent properties are closely related to the size, shape, composition an...

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Problems solved by technology

The principle of the physical method is simple, and the product obtained has less impurities, but the obtained particle size distribution is relatively wide, the requirements for the instrument are high, and the production cost is high, so the control of the shape of the nanomaterial is limited.

The chemical method is the most widely used synthetic method at present. It is easy to operate and has the best controllability in particle size and shape. The disadvantage is that some protective agents or forming agents need to be added during the preparation process, resulting in serious environmental pollution.

[0003] There are many reports about the reduction of plant biomass to obtain palladium nanoparticles, such as Lishan Jia obtaining palladium nanoparticles through geniposide water extract (Jia L, Zhang Q, Li Q, et al. The biosynthesis of palladium nanoparticles by antioxidants in Gardenia jasminoides Ellis: long lifetime nanocatalysts for p-nitrotoluene hydrogenation[J].Nanotechnology, 2009,20(38):1-10.), Mallikarjuna reported palladium nanoparticles obtained by reduction of tea or coffee extract (Nadagouda MN, Varma RS .Green synthesis of silver and palladium nanoparticles at room temperature using coffee and tea extract[J].Green Chemistry, 2008,10(8):859), M.Sathishkumara also obtained palladium nanoparticle through the reduction of Ceylon cinnamon bark extract Particles (Sathishkumar M, Sneha K, Kwak IS, et al. Phyto-crystallization of palladium through reduction process using Cinnamom zeylanicum bark extract[J].J Hazard Mater,2009,171(1-3):400-404.), However, the existing palladium nanoparticles obtained by plant reduction are mainly spherical particles, and there are few reports on the synthesis of palladium triangular sheets. Yujie Xiong obtained nano-palladium triangular sheets by adding PVP under the reduction of ethylene glycol ( XiongY, McLellan JM, Chen J, et al.Kinetically Controlled Synthesis of Triangular and Hexagonal Nanoplates of Palladium and Their SPR / SERS Properties[J].JAm Chem Soc,2005,127(48):17118-17127.), found in Palladium triangles in the visible region exhibit surface plasmon resonance and can be used as active substrates for surface Raman reactions

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