Study On The Preparation Of Composite Photocatalysis And Their Photocatalytic Properties

As a traditional environment-purifying technique,photocatalysis degradation has been widely researched in the domain of environment pollution.But until now,it has not been used in the industrialized water pollution control.Two factors weigh heavily against it.First,the powder recycling is very difficult.Second,the cost of photocatalysis degradation is still low. Basing on all of it,this article take focus on produce a new photocatalyst that can resolve these problems.In order to recycle the photocatalyst,synthesiseing a magnetic photocatalyst by direct deposition of TiO₂ onto a magnetic core.Relying on the success above,pick Al₂O₃,SnO₂, SiO₂ as composite materials,produce Al₂O₃/Fe₃O₄/TiO₂,SnO₂/Fe₃O₄/TiO₂,SiO₂/Fe₃O₄/TiO₂ magnetic composite photocatalyst and investigate capability all of these.The results are summarized as following:(1) The TiO₂ photocatalyst which have been produced in lab have a great effect of photocatalysis degradation.(2) The magnetism of Fe₃O₄/TiO₂ is excellent.The material of Fe₃O₄ and TiO₂ get well integrated,but the degradation rate of is low.(3) All of the three magnetic composite photocatalyst have better effect of photocatalysis degradation compare with Fe₃O₄/TiO₂,their photocatalytic activity could arrange like this: Al₂O₃/Fe₃O₄/TiO₂> SnO₂/Fe₃O₄/TiO₂> Si_O2/Fe₃O₄/TiO₂,the degradation rates are 93.28 %,86.04%,79.63%.(5) The reason why Al₂O₃/Fe₃O₄/TiO₂ could get a better photocatalytic activity is that going with the Al₂O₃ entered.The magnetic composite photocatalyst could get a better adsorption behavior.(6) Repeating use Al₂O₃/Fe₃O₄/TiO₂ with 6 times.The second and third one could get much better degradation rate compare with the following ones.(7) The photodegradation experiment is in accordance with langmiur-hisheshood formula.