Study On Degradation Of Typical Dye By Peroxymonosulfate Activated With CoMgFe-LDH

Rhodamine B?RhB?in dyeing wastewater can not be effectively metabolized by microorganisms,and conventional water processing methods have difficulty degrading it,which does great harm to the environment.Thus making it significant to create an economic,efficient and environmentally friendly way of water processing.In this paper,peroxymonosulfate?PMS?system activated by CoMgFe-LDH was used to degrade RhB,the efficiency of which was analysed.This paper characterized CoMgFe-LDH,while controling the volume of RhB,CoMgFe-LDH,PMS and initial pH,temperature and other elements like anion that may have impact on degrading efficiency.Plus,this paper investigated the efficiency of simulated dyeing wastewater degraded by CoMgFe-LDH/PMS system under circumstances that different concentration of RhB,CoMgFe-LD,PMS and temperature brings,while predicting the optimal operating conditions using Response Surface Methodology.This paper characterized catalyst using BET,SEM,XRD,FT-IR,the result of which showed that CoMgFe-LDH had good crystal form and presented as stacked lamellar structure,with the specific surface area of 48.99m²/g,pore content of 0.52cc/g,average pore diameter of34.34nm.In CoMgFe-LDH/PMS system,the optimal operating condition to degrade 30.0?M RhB is[PMS]0=0.2mM,CoMgFe-LDH=0.40g/L,pH0=5.0,T=25?,in which situation this experiment 98.0%of RhB can be removed within 6 minutes,the process of which meeting Pseudo-Primary dynamics.According to the single factor impact experiment,the removal of RhB goes up with the increase of CoMgFe-LDH and PMS,while it goes down by rising the concentration of RhB;the increase of pH promotes the degradation first and then restrains it;the rise of temperature greatly improves the effeciency.The efficiency of degrading RhB gradually goes down with the increase of Chloride ions,and low concentration of Chloride ions doesn't show obvious inhibition to it.Efficiency goes down when Hydrogen carbonate root ions increase,and Nitrate ions do not have much affect on the whole degradation.The optimal operating condition to degrade 90.0?M simulated dyeing wastewater is[PMS]₀=1.2mM,CoMgFe-LDH=0.80g/L,pH₀=5.0,in which situation this experiment 98.1%of RhB can be removed within 10 minutes.During the experiment,degradation rate goes up with the increase of oxidant and CoMgFe-LDH.Increase in concentration of RhB give rise to the diminishment of processing course.Besides,decrease of pH in a specific range leads to higher degradation.According to Response Surface Methodology,the optimal operating condition to degrade 90.0?M RhB is[PMS]0=1.534 mM,CoMgFe-LDH=0.929g/L,,pH0=4.58,in which situation the dyeing wastewater can be disposed entirely in 6 minutes.