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Degradation Of Rhodamine B By Copper-zinc-Co Oxide In Collaboration With Carbon Nitride Fenton

Posted on:2024-05-20Degree:MasterType:Thesis
Country:ChinaCandidate:E S ZhuFull Text:PDF
GTID:2531307097958809Subject:Environmental Science and Engineering
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With the rapid development of Chinese industry,the problem of printing and dyein g wastewater pollution has become increasingly serious.Traditional Fenton process is wi dely used in the treatment of organic wastewater,but there are still some shortcomings such as narrow p H response range,easy to produce iron mud,low utilization rate of H2O2,which brings a series of problems to the actual treatment of printing and dyeing w astewater.In this paper,a Fenton catalyst Cu O/Zn O/CuxCo3-xO4/g-C3N4(CZC/CN,copper-zinc-Co oxide co-with graphitic carbon nitrode)was prepared to overcome these shortco mings and catalyze H2O2degradation of Rhodamine B by CZC/CN.The influencing fac tors,wide applicability,cycle stability,efficient utilization of H2O2and catalytic mechani sm of Rh B)were studied,specifically as follows:(1)In this study,copper-zinc-cobalt metal oxide(CZC)was doped into graphite p hase carbon nitride(g-C3N4or g-CN)to obtain CZC/CN composite catalytic material.X-ray photoelectron spectroscopy(XPS),electron paramagnetic resonance(EPR),N2isothe rmal adsorption/desorption curves,X-ray diffraction(XRD),Fourier transform infrared sp ectroscopy(FT-IR)and other characterization were used.The results show that the main components of CZC/CN are g-CN,Zn O,Cu O and CuxCo3-xO4.Compared with g-CN a nd CZC,CZC/CN not only has a larger specific surface area(43.8 m2/g),but also has a stronger free electronic signal,which is more suitable for catalytic degradation of the target pollutant Rh B.CZC and g-CN are doped together to form C-O-Cu bond,and th e active sites include Cu2+/Cu+and Co3+/Co2+.(2)The effects of H2O2,catalyst,Rh B concentration and p H value on the degra dation of Rh B were systematically studied.The degradation rate of Rh B was positivel y correlated with H2O2(5-75 m M)and catalyst concentration(0.1-0.7 g/L),and negative ly correlated with Rh B concentration(5-50 mg/L)in the initial reaction system.The pr epared composites have good catalytic effect in p H 3.3~11.0 range.At 25℃,in the pre sence of 0.3 g/L CZC/CN composite and 40 m M H2O2,the degradation of 10 mg/L Rh B was 97.5%in 120 min(p H not adjusted).The results of experiments on inorganic a nions,natural water bodies and organic pollutants show that it has good wide applicabil ity.Compared with CZC,CZC/CN consumes less H2O2and has a higher degradation ra te of Rh B in the same time,which proves the efficient utilization of H2O2by CZC/C N.The results of cyclic stability test,FT-IR,XRD and EPR show that CZC/CN has go od cyclic stability.(3)Radical trapping experiments and electron paramagnetic resonance spectroscopy(EPR)showed that hydroxyl radical(·OH)and singlet oxygen(1O2)were the main rea ctive species in CZC/CN/H2O2system.The degradation products of Rh B in CZC/CN/H2O2system were analyzed by HPLC-MS.The degradation of Rh B in CZC/CN/H2O2sy stem involved N-deethylation,chromatin group cracking,ring-opening and mineralization.In conclusion,compared with CZC,CZC/CN composite prepared in this study has higher reaction rate constant,lower concentration of copper(0.157 mg/L,)and cobalt(0.221 mg/L)leaching,and still has good applicability under neutral and alkaline condition s.It is a promising Fenton-like catalyst.It has important reference for the degradation o f organic dye pollutants.
Keywords/Search Tags:Copper zinc cobalt oxide/graphite phase carbon nitride, Hydrogen peroxide, Hydroxyl radical, Singlet oxygen, Rhodamine B
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