Preparation method of nanometer zinc oxide-bamboo charcoal composite particle with antibacterial and adsorption functions

Abstract

The invention relates to a preparation method of nanometer zinc oxide-bamboo charcoal composite particle with antibacterial and adsorption functions. The preparation method comprises the following steps: (1) adding a bamboo raw material into a mixed acid solution, reacting at 50-90 DEG C for 1-20 hours, adding alkali liquor to neutralize the solution after the reaction to obtain a carboxylated bamboo cellulose nanocrystals; (2) adding the carboxylated bamboo cellulose nanocrystals into a solution of 0.005-5 mol / L zinc ions, adding alkali liquor to neutralize, diluting the reaction product through deionized water, centrifuging and freeze drying or vacuum drying the reaction product, and then, vacuum calcining the reaction product at 200-600 DEG C for 1-8 hours to obtain the nanometer zinc oxide-bamboo charcoal composite particle. The process disclosed by the invention is simple, convenient, easy to operate and free of environmental pollution, and the preparation period of the composite particle is shortened; the prepared nanometer zinc oxide-bamboo charcoal composite particle is small in size, easy to regulate and control and large in specific surface area, the bamboo charcoal is very firmly combined with the nanometer zinc oxide, so that the antibacterial effect is durable, and the nanometer zinc oxide-bamboo charcoal composite particle has good adsorption capacity on toxic substance, thereby having a wide application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of functional nanoparticles, in particular to a method for preparing nano zinc oxide-bamboo charcoal composite particles with antibacterial and adsorption functions. Background technique [0002] Zinc oxide is a regular hexagonal wurtzite polar crystal structure, which has the advantages of good stability, no discoloration under high temperature, no decomposition, low price, and abundant resources. In particular, nano-zinc oxide has small size, large specific surface area, quantum size effect, surface effect, volume effect and macroscopic tunnel effect, etc. Compared with ordinary zinc oxide, it shows many advantages, such as antibacterial, ultraviolet scattering, non-toxic, Corrosion resistance, etc., can be used in cosmetics, sunscreens, food packaging materials and other fields (CN1161279C; CN1296041A; CN101214993B). Bamboo charcoal is the main product of thermal decomposition of bamboo. It has a we...

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Problems solved by technology

In this method, bamboo charcoal pretreated by sodium hydroxide is used as a template, and a mixture of zinc acetate and oxalic acid is used as a raw material, reacted at room temperature for 24 hours, dried and calcined at 800°C for 7 hours to obtain micron-sized nano-zinc oxide rods (Gong L, Jiang H, Zhu FH. A facile and green approach for the fabrication of ZnO nanorods using bamboo charcoal as the template. Materials Letters 2010; 64: 2582–2584), the diameter of the obtained ZnO nanorods is about 300 nm , the length can reach several microns, but this method only uses the template effect of the bamboo charcoal particles, and the final bamboo charcoal particles are roasted, and does not take advantage of its strong adsorption function

Tan Aimiao et al. disclose a kind of bamboo charcoal as substrate, with sodium hydroxide, zinc sulfate heptahydrate as raw material, polyethylene glycol-6000 as dispersant, adopt the method of precipitation-dipping to synthesize nanometer zinc-bamboo charcoal composite particles, Its particles are spherical, with an average particle size of 40-100nm (CN101947442B), but this method has problems such as the weak binding force between zinc oxide and bamboo charcoal particles

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