| Due to the depletion of natural resources,industrial processes such as printing and dyeing industry are trying to reduce the use of natural ratio by adding organic compounds in the raw materials.However,these organic compounds in the manufacturing process can not be easily degraded by microorganisms and long-term accumulation of azo dyes has been proved to be carcinogenic to humans without proper treatment.In this study,powered tourmaline was mainly used to activate Fenton/ultrasound process for decoloriation of an azo reactive dye（RB5）and analysis the different influence factors in Fenton/US decoloriation process.According to the results,it shows that:Fenton process can effectively reduce the concentration of simulation dye waste-water.Key parameters affecting the performance of oxidation process including tourmaline dosage,H2O2 dosage,temperature,source of ferrous ion,assistance of ultrasound and inorganic salts type,etc.Different reaction procedures are also assessed for the optimum reaction conditions including Fenton,Fenton/US,Fenton/55℃,H2O2/US,TM/US and US.The pseudo-first-order equation rate is Fenton/50℃（1.53×10-1min-1）>Fenton/US（8.714×10-2min-1）>Fenton（2.774×10-2min-1）>H2O2/US>H2O2>TM.Comparing to normal Fenton process,Fen ton/US process can dramatically enhance the dye removal rate and accelerate the reaction rate.For reactive dye RB5,the method of Fenton/US can remove 93%of 2×10-5mol/L.Experiment result shows that the suitable condition for RB5 degration in the Fenton process is pH3.0,tourmaline 0.75g/L,H2O2 1.03x10-2mol/L and ultrasound power 120W/L and US time 20 minutes.（4）After Origin9 software fitting,it shows that Findings showed that such decolorization reaction could can be best described by pseudo-first-order equation.Results clearly indicated that natural Fe-mineral,tourmaline,can be used to catalyze Fenton process for reactive dye RB 5;and when it is used to simulated textile wastewater,it can also effectively degrading organic pollutants macromolecules. |
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