Preparation And Structure Of ZnoO-based Nanomaterials And The Mechanism Of Pollution Treatment

In recent years,the problems of environmental pollution and energy crisis have become increasingly prominent,and the research on pollution control and clean energy has received extensive attention and attention.ZnO is a multifunctional material that can be used as an adsorbent and piezoelectric catalyst to remove pollution and decompose water to produce hydrogen.However,when pure ZnO is used as an adsorbent or piezoelectric catalyst,its effect is not ideal.Proper doping or compound modification of ZnO can not only significantly improve related performance,but also help to adsorb and piezoelectric catalysis Deep understanding of the physical mechanism.In this paper,ZnO,Al-doped ZnO,ZnO-Cu₂O,ZnO-TiO₂ nanomaterials were prepared,and the influence of preparation process conditions on the microstructure of the samples was studied.The mechanism of sample adsorption of organic dye molecules and piezoelectric catalytic degradation was analyzed.The main results are as follows:?1?ZnO only has a high adsorption capacity for anionic dye molecules,through Al doping,the adsorption capacity is further improved.The reason may be related to the defects introduced by Al doping and the positive charge on the surface of ZnO;?2?The cationic dye molecules that cannot be removed by adsorption can be removed by piezoelectric catalysis.Compared with pure ZnO,ZnO-Cu₂O composites have a higher piezoelectric catalytic degradation ability,which may be due to the formation of a depletion layer at the interface of ZnO-Cu₂O,which reduces the concentration of free electrons in the sample;?3?The layered ZnO-TiO₂ composite material was prepared,and the crystal structure,morphology,composition,light absorption,photoluminescence,piezoelectric catalysis and other properties of the composite material were studied.It was found that the composite material expanded the light absorption range and reduced the photoluminescence intensity,but the piezoelectric catalytic effect was weakened.The relationship between photoluminescence and piezoelectric catalysis shows that there is no close relationship between the separation efficiency of photogenerated electron holes and piezoelectric catalysis.