The Photocatalytic And Adsorption Activity Of The Modified Zinc-series Hydrotalcite-like Compounds

In recent years,with the development of industry and population expansion,the phosphorus pollution becomes more and more serious.Phosphorus pollution is the main factor causing eutrophication of water.Eutrophication causes excess proliferation of phytoplankton in water and usually brings into water bloom and red tide,which greatly damages to human health and sustainable development of economy.The aquatic environment and aquatic ecological safely have been greatly endangered.As result,there is no time to delay for the solution of phosphorus removal.Dyeing waste water has played a major role in industry waste water outlet with the rapid development of chemical fiber and textile industry in our nation and the dyeing waste water with quantity has heavy pollution and its treatment is very difficult.Therefore,to improve the remove organic ration and decolorization is the main task in the dye waste water treatment.Layered Double Hydroxides(LDHs)is being paid more and more attention for special samdwich,controllability of layers interval and anionic exchanging.Hydrotalcite-like anionic clays have many special properties,which can be used as catalysis materials and absorbing materials widely.In this article we study a method of synthesis and metal composite of Layered Double Hydroxides.The ZnAl-LDH and ZnAl/Ce-LDH which having abosorbing property by urea method.The ZnAl/Bi-LDHs which having the absorbing and photocatalytic property were prepared by urea method.The effects of preparation conditions on the catalytic properties were studied,including the metal ions ratios,the reaction temperature and the reaction time.Using the ZnAl-LDH to do experiment of removal phosphorus.The result show that the adsorption capacity of the metetial adsorbed phosphorus is 24.5 mg/g.The Langmuir isotherm can be used to reflect the behavior of adsorption on phosphorus.Using the ZnAl/Ce-LDH to do experiment of removal phosphorus.The adsorption capacity as high as 28.9 mg/g.The Langmuir isotherm can be used to reflect the behavior of adsorption on phosphorus.The ZnAl/Bi-LDH was used for removal the phosphorus in water solution.The result show that the adsorption capacity of the metetial adsorbed phosphorus is 16.7 mg/g.The ZnAl/Bi-LDH has the photocatalytic property and was used for removal the Rhodamine B solution.In the same condition,50mg catalyst into the 50mL of the initial concentration of 10mg/L Rhodamine B solution.The photocatalytic reduction rate was reached to 95.6%after 60min illumination with a 500w mercury lamp.