Study About The Ultrasonic-photocatalytic Degradation Of Procion Blue MX-R

The efficient and economic oxidized technology of water treatment is arising with the great development of modern industry and the harder process because a lot of organics which are hard to degrade. Therein, the technology of ultrasonic degradation, the technology of photocatalytic degradation and the technology ultrasonic-photo catalytic degradation are broadly noticed by scholar home and abroad and are recognized as one of the most promising new technology on water treatment in environment.The paper takes Procion Blue MX-R as model pollution and preliminary studies the kinetics law of reaction that ultrasonic, photocatalysis and ultrasonic-photocatalysis degrades MX-R and then investigates the influences caused by the different factors during the degradation process. The result showed that: (1) ultrasonic degrades MX-R:①simple ultrasound can't decolorize MX-R; the additional metal salt have a certain promotive effect on the decoloration of the MX-R's ultrasonic degradation;②there are two stage in the kinetics law of ultrasonic degradation of COD_Cr, and then both the two stage follow the first order kinetics, the MX-R ultrasonic decoloration included Fe³⁺ does;③there are more efficient that the MX-R ultrasonic degradation of COD_Cr under the strong acid condition;④there is a best value of power when ultrasonic degradation of COD_Cr,and the constant absolute value of velocity is increasing with the ultrasonic power's increasing, when the ultrasonic power reach a certain maximum, the bigger ultrasonic power the smaller absolute constant value of velocity;⑤during the different stage of MX-R ultrasonic degradation of COD_Cr , the constant absolute value of velocity is negative first or second kinetics law of initial concentration;⑥the relation of the constant k of velocity that ultrasonic decoloration : Fe³⁺>Al³⁺>Cu²⁺>Mn²⁺>Na⁺>K⁺; The bigger Fe³⁺'s concentration, the bigger k, the bigger Na+,K+'s concentration, the smaller k and the k increases firstly then reduces secondly with the strength of Al³⁺,Cu²⁺,Mn²⁺'s increasing; The relation of the constant k of velocity that MX-R ultrasonic decoloration included the different types anionic ferrous: NO3->Cl->SO42- under the same concentration of ferrous anion; There are great effect on MX-R ultrasonic degradation of COD_Cr because of adding Fe³⁺, when it is up to 0.015mol/kg, the effect of MX-R's elimination is the best. (2) photocatalytic degradation MX-R:①both MX-R photo catalytic decoloration and photocatalytic degradation follow the first order kinetics;②when pH reach 10,the more efficient on photocatalytic decoloration, when pH reach 7, the more efficient on photocatalytic degradation of COD_Cr;③the constant k of velocity of photocatalytic decoloration and degradation of COD_Cr is increasing with adding more TiO₂,when the mount is up to 100mg/L, the more TiO₂, the k keep the same;④the constant k of velocity of MX-R photocatalytic decoloration and degradation of COD_Cr is the -1.2 and -1.6 order kinetics of the initial concentration c0;⑤in the photocatalysis system adding the Fe³⁺ captures the electron efficiently, chastises the combination of electron and hole, and promotes MX-R's photocatalytic degradation evidentially, when the concentration of Fe³⁺ equals 1.5mmol/L,it is the most fitness for photocatalytic decoloration while 0.5mmol/L ,it is the most fitness for photocatalytic degradation of COD_Cr; (3) the technology of ultrasonic-photocatalytic degrades MX-R:①both the ultrasonic-photocatalytic decoloration and degradation of COD_Cr follow the first order kinetics;②the constant velocity k of decoloration and degradation of COD_Cr is increasing firstly and reducing secondly with the pH's increasing;③the constant k is also increasing firstly and reducing secondly with the ultrasonic power's increasing;④the constant k is increasing firstly and keep the same lastly with the TiO₂'s adding;⑤the constant velocity of MX-R ultrasonic-photocatalytic decoloration and degradation of COD_Cr is the -1.3 and -1.4 reaction of initial concentration c0 separately;⑥adding Fe³⁺ to the ultrasonic-photocatalytic reaction promotes the MX-R ultrasonic-photocatalytic decoloration evidently, however, the additional concentration of Fe³⁺ can disturb the measure of COD_Crevidently, when the saturation of Fe³⁺ reach 0.25mmol/L, it is the most fitness for MX-R ultrasonic-photocatalytic degradation.In view of the experiment from the chapter two to chapter five, comparing the mutualism that the three advanced oxidative technologies make to the degrading law of MX-R, the analysis during the process that ultrasound photocatalytic degrades MX-R,studying the promotive effect that Fe³⁺ make to the three advanced oxidative technologies, the investigative consequence shows :①the constant k of reactional velocity of decoloration and degradation of COD_Cr have the resemble variant law, when the three advanced oxidative technologies are under the same factors; the effect of degradation of COD_Crcaused by the experimental condition is more than it in decoloration; there are different promotive effects in MX-R's decoloration and degradation of COD_Cr,when adding Fe³⁺; photocatalysis, ultrasonic-photocatalytic degradation is a process that do decoloration firstly and do decarbonization after;②during the process of ultrasonic-photocatalytic degrading MX-R, there has mutualism about ultrasound, photocatalysis.③during the process of ultrasonic-photocatalytic degrading MX-R included Fe³⁺, ultrasound is in conjunction with photocatalysis, while in the process of degrading COD_Cr,ultrasound is disincentive with photocatalysis.④the promotive effect that Fe³⁺ makes to ultrasonic-photocatalytic degradation is mainly on capturing the photoproduct ion and hole.