Preparation And Properties Of Copper-based Oxide And Its Composites

The large-scale industrial production and the diversification of human lifestyles have brought great harm to the environment and sustainable development.In recent years,as multi-functional materials,copper-based oxides show good properties in the fields of adsorption,bacteriostasis,photocatalysis and so on.However,the preparation of cuprous oxide particles by traditional methods not only requires a large number of toxic chemical reagents,but also easy to produce other toxic compounds,resulting in secondary pollution to the environment.Therefore,a green and environmentally friendly low-cost synthesis method will become a new synthesis trend.In this study,in view of the problems and defects of copper-based oxides and their synthesis methods,cuprous oxide particles were prepared by a new green synthesis method using extracted tea polyphenols as reducing agent without strong acid and strong base.the selective removal performance of dyes was studied,and the reaction mechanism was discussed.Furthermore,Cu₂O/rGO composites and recyclable Cu₂O/Non-woven farbics(Cu₂O/NF)composites were prepared and characterized by XRD,EDS,SEM,FTIR,BET,XPS,etc.,and applied to dye removal and biological bacteriostasis.The main conclusions of the paper are as follows:1)The cuprous oxide particles have a relatively regular spherical shape and show a good selective removal effect for anionic dyes(Orange ?,Congo Red,Methyl Orange).Its adsorption capacity for orange ?,Congo red and methyl orange dyes is 478,315,120mg/g,respectively in accordance with pseudo-second-order kinetics and Langmuir isotherm model,and the adsorption process is mainly chemical adsorption.2)Cu₂O/rGO composite material has strong bacteriostatic activity.Escherichia coli,the representative strain of Gram-negative bacteria,and Bacillus subtilis,the representative strain of Gram-positive bacteria,were selected as the research objects.The bacteriostatic effect was determined by bacteriostatic circle method and growth curve method,and it was confirmed that it had stronger bacteriostatic ability to E.coli.3)The batch experiment results show that:when the temperature is 298 K,the initial concentration is 50 mg/L,and the reaction time is 360 min,the removal rate of Orange?by Cu₂O/Non-woven fabrics composite material can reach 96.26%,and after three cycles of use,the removal rate remains at 75.41%.At the same time,it has good bacteriostatic performance.When Cu₂O/Non-woven fabrics composite material is 50?g/m L,the growth of Escherichia coli is completely inhibited;when it is 60?g/m L,the growth of Bacillus subtilis is completely inhibited.Generally speaking,the prepared Cu₂O/Non-woven fabrics composite has excellent dye removal performance and good antibacterial performance,and Cu₂O is easy to be recycled and reused because it is not easy to fall off due to its in-situ growth on non-woven fabrics.