Preparation method and application of a bactericidal material based on loofah

Abstract

The invention discloses a preparation method of a sterilization material employing loofah sponge as a matrix. The method comprises the steps of adding chitosan to deionized water under an intense stirring state, dropwise adding glacial acetic acid for assisting in dissolution, hydrolyzing at room temperature for 4-8h, heating in a water bath at 50-70 DEG C, slowly dropwise adding a silver nitrate solution and heating to 75-85 DEG C for constant-temperature reaction for 10-14h to obtain a gold nano silver colloidal solution; peeling and denucleating loofah fruits, cleaning and drying, soaking the loofah in sodium hydroxide and triethylamine, and repeatedly cleaning until the pH is 7 to obtain modified loofah sponge; and soaking the modified loofah sponge into the nano silver colloidal solution, carrying out ultrasonic absorption as an assistant means, drying and repeatedly cleaning until no silver is washed out, and drying again to obtain the sterilization material. According to the method, the strong adsorption effect of the loofah sponge on an organic matter is skillfully utilized and the nano silver material is uniformly deposited on the wall of a vascular bundle of the loofah sponge; the preparation method is simple and easy to operate; and the prepared product is of an overall material, is easy to use, store and popularize, and is safe and nontoxic.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and relates to a preparation method of an environment-friendly nano-silver loaded material. Background technique [0002] With the improvement of living standards, the emphasis on water safety is also increasing. The use of nano-silver fungicides in tap water systems has been applied in some European countries, but conventional nano-silver is unstable, a natural, safe, non-toxic load Materials are needed. At present, bleaching powder is still used as the main fungicide for civil water in my country. The harm of residual chlorine after sterilization is widely recognized. Therefore, a safe, efficient, green, spectrum, and non-resistant fungicide urgently needs to be developed. Nano silver Fungicides meet all the above requirements, but as we all know, nano-silver is easy to agglomerate due to its large specific surface area in the natural state, so there are many related r...

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Problems solved by technology

[0002] With the improvement of living standards, the emphasis on water safety is also increasing. The use of nano-silver fungicides in tap water systems has been applied in some European countries, but conventional nano-silver is unstable, a natural, safe, non-toxic load Materials are needed. At present, bleaching powder is still used as the main fungicide for civil water in our country. The harm of residual chlorine after sterilization is widely recognized. Therefore, a safe, efficient, green, spectrum, and non-resistant fungicide urgently needs to be developed. Nano silver Fungicides meet all the above requirements, but as we all know, nano-silver is easy to agglomerate due to its large specific surface area in the natural state, so there are many related research reports around nano-silver loading. CN103232035A reports the use of rice husk activated carbon as an adsorbent, Add deionized water, add monovalent silver, and then add a reducing agent to generate nano-silver. This method firstly complexes silver ions with activated carbon, and then reduces to obtain nano-silver. However, the nano-silver prepared by this method is easy to agglomerate and has limited adsorption capacity.

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