Preparation And Photo-catalystic Degradation Property Of Metallic Glasses And Their Composite Membranes

The development of today's society is constantly accelerating,while the development of the chemical industry is also advancing with it,but at the same time it also created a large number of industrial wastewater.Dyestuff wastewater is one of the main components of industrial wastewater.Its random discharge will cause great harm to the world environment.In order to effectively reduce the harm of dyes to human beings and the environment,the photocatalytic degradation mechanism,degradation efficiency and photocatalytic degradation stability of methylene blue by Mg₆₀Cu₂₁Gd₁₂Ag₇ amorphous alloy and amorphous alloy film were studied.The results show that:?1?For malachite green with triphenylmethane dyes,Mg₆₀Cu₂₁Gd₁₂Ag₇ amorphous alloy can provide more active sites,produ-ce a large number of hydroxyl radicals,promote the breaking of C-C bonds of malachite green molecule,and produce benzophenone and benzaldehyde due to its unique metastable structural characteristics;dibenzophenone is further decomposed into N,N-xylene and benzaldehyde under the action of hydroxyl radicals,and finally degraded into benzoic acid and OHCONH₂.The photocatalytic degradation of malachite green by amorphous alloys is much better than that by crystalline alloys.The photocatalytic degradation rate of amorphous alloys can reach 96%after 10 minutes of degradation,while that of crystalline alloys can achieve the same photocatalytic degradation effect after 30 minutes of degradation.In addition,the photocatalytic degradation efficiency of crystalline alloys decreased from 97.81%to87.77%after five cycles,and the excellent corrosion resistance of amorphous alloys maintained 95.58%photocatalytic degradation ability of malachite green after 50 cycles of photocatalytic degradation.?2?For other triphenylmethane dyes,basic fuchsin and methyl violet,amorphous alloy powder still has stable,efficient and excellent cyclic stability.When alkaline fuchsin is degraded,the first degradation rate can reach 99.3%,and 97.3%after 10 cycles.For methyl violet,the first degradation rate can reach 99.96%and 99.91%after 10 cycles.It shows that amorphous alloys have extensive and efficient photocatalytic activity for triphenylmethane dyes.?3?Metal glass can degrade methylene blue solution efficiently and has good cyclic stability.The high degradation of methylene blue by amorphous alloys results from the production of a large number of hydroxyl radicals in water.These radicals break the easily destroyed C-S bond and C-N bond in methylene blue molecule,and finally fade the methylene blue solution.?4?Composite fiber membranes prepared by electrospinning also have good photocatalytic efficiency and cyclic stability.When methylene blue was degraded,the degradation rate of amorphous alloy reached61.4%in 10 minutes and 99.1%in 30 minutes.The degradation rate of amorphous alloy film reached 73%in 10 minutes and 99.3%in 30minutes.The cycling performance of amorphous alloys after film formation is also excellent,and the degradation rate of amorphous alloys remains 99%after 10 degradation cycles.