Study On Synthesis And Adsorption-photocatalytic Properties Of Visible Light Response Of ZnFe₂O₄/Bi₂O₃

The printing and dyeing wastewater is one of the main pollution source of waterpollution in china. Compared with the traditional printing and dyeing wastewatertreatment method, semiconductor photocatalytic technology has attracted wideattention for its wild reaction conditions, strong oxidation ability, can use solar energyas energy source, and photocatalyst doesn’t consume, no secondary pollution,non-toxic, stable in reaction process. Bi2O3has been a widely discussed insemiconductor photocatalytic for its special electronic structure, crystal structure, thehigher organic matter degradation ability and excellent light adsorption ability. Inlight of the industrial wastewater pollution increasingly serious problem, usingZnFe2O4combined with Bi2O3, build enhanced visible light response of Bi2O3composite catalytic system, printing and dyeing wastewater were used in thedegradation of methyl orange. And through a series of methods to analyze thecatalyst’s structure and photocatalytic performance. These methods are XRD, XPS,BET, UV-vis, SEM, TEM, and FT-IR.The results showed that:(1) ZnFe2O4photosensitization improve the performance of the visible lightresponse of Bi2O3. The catalyst preferably has a degree of crystallinity, forbiden bandwidth from3.1ev to2.4ev, specific surface area of280.0m2/g to95.0m2/g.(2) By comparing the effect of photodegradation of Bi2O3and ZnFe2O4/Bi2O3found that ZnFe2O4photosensitization can enhance the Bi2O3response to visible lightintensity. When is equal to0.067mol/mol the degradation efficiency is the highest.The degradation efficiency becomes smaller when the mixing ratio increased again.The relationship between initial concentration and the rate of reaction with18.087C0.92720formula. With increasing of the initial concentration of the reaction rate is smaller, Solution PH had great influence on the reaction rate, andwhen PH=4reaction rate was the fastest.(3)0.067mol/mol ZnFe2O4/Bi2O3catalyst adsorption kinetics showed that: theadsorption process under the conditions of the initial concentration is200mg/l, PH=4in accordance with double constant rate equation. It is proved that the adsorption ofmethyl orange by ZnFe2O4/Bi2O3is influenced by many factors.0.067mol/molZnFe2O4/Bi2O3catalyst adsorption thermodynamics showed that: the adsorptionprocess under the conditions of the initial concentration is200mg/l, PH=4inaccordance with Freundlich adsorption model, and the adsorption process is afavorable adsorption because the1/n=0.51035(<1).