Preparation Of Cuprous Oxide And Its Antibacterial Application Research In Bitter Buckwheat Hull

The poor quality of sleeping and insomnia are plagued people due to the accelerated rhythm of life.And fatigue,discomfort,the efficiency of studying and working,mood swings,or irritability will appear in the next day.Because buckwheat hull has the effect of clearing brain and eyesight,it as pillow can soothe the nerves and promote sleeping.But scalp secretions such as perspiration and grease make that is easy to breed bacteria in buckwheat hull.In order to solve these problems,a kind of antimicrobial agent Cu₂O with good antibacterial property and low-cost has been studied.Through the exploration of different morphology,the control of size and the transformation of morphology,the hollow spheres Cu₂O with better antibacterial activities have been prepared by a simple and effective chemical method.And Cu₂O has been successfully applied and finished in bitter buckwheat hull,giving the buckwheat shell better antibacterial properties.The main research work and achievements are as follows:（1）The different morphologies Cu₂O powders were controlled and synthesized.The cubic and polyhedral Cu₂O were prepared on the basis of the existing methods.And hollow sphere Cu₂O had been synthesized through copper ammonia solution because copper ammonia solution has the characteristics of analytical balance.The experiment results showed that cubic Cu₂O was brick red and was with average size of 125 nm.Polyhedral Cu₂O with 115 nm around was yellowish red.And the hollow sphere Cu₂O was orange and was composed of many smaller nanoparticles.The size was about 175 nm.The results of antibacterial test indicated that three kind of Cu₂O had a good inhibitory effect on Escherichia coli（E.coli）and Staphylococcus aureus（S.aureus）,and hollow sphere Cu₂O showed better antibacterial activities for E.coli compared with the cubic and polyhedral Cu₂O.Moreover,it was proved that the electrostatic adsorption between bacteria and Cu₂O was stronger,and that made a contribution to adsorbing on the cell surface and destroying the cell wall.Thus hollow sphere Cu₂O exhibited better antibacterial property.（2）In the previous experiment,it had been confirmed that the antibacterial activities of the hollow spherical Cu₂O was the best.In order to optimize the structure and improve the properties of the sample,the morphology of Cu₂O transformed from solid polyhedrons to hollow spheres with the addition of triethanolamine（TEOA）.The results showed that the grain size of Cu₂O through the copper amine solution was relatively small,which was about 10.1 nm.The concentration of TEOA played an important role in morphological conversion,and there was a concentration threshold.Only TEOA concentration was 1 M⁵ M,uniform hollow sphere Cu₂O could be prepared.The TEM of different reaction times indicatedthattheformationhollowsphereCu₂Ocouldberelatedto dissolution–crystallization mechanism accompanied by the Ostwald ripening.And the antimicrobial effect of Cu₂O could be achieved by morphological transformation.（3）Finally,using Cu₂O as an antibacterial agent,the bitter buckwheat hull had been antibiotic finished and obtained the antibacterial property.It was found that there were a lot of pores and wrinkles in the bitter buckwheat hull epidermis,and Cu₂O could enter the gap or cover the surface of the fold to form an antibacterial film fixed on the bitter buckwheat hull.The antibacterial results showed that Cu₂O had the best loading effect on the bitter buckwheat shell by dip finishing process.The antibacterial inhibition rate of the bitter buckwheat hull using hollow sphere Cu₂O was the most obvious and up to 99.9%.The fastness to washing of bitter buckwheat hull using hollow sphere Cu₂O was the best.And the inhibition rate was still more than 90%when washed to 20 times.