首页|Degradation of Rhodamine B by MnFe-LDH/PMS/O3 three-phase catalytic system:performance,mechanism and ecotoxicity studies
Degradation of Rhodamine B by MnFe-LDH/PMS/O3 three-phase catalytic system:performance,mechanism and ecotoxicity studies
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This study developed a novel MnFe-LDH/PMS/O3 three-phase catalytic system to degrade the organic dye RhB,which was used to address the drawbacks of persulfate oxidation and ozonation techniques.The structure,ionic and elemental composition,specific surface area,and magnetic properties of the LDHs were investigated using a variety of physicochemical characterization tools.The results showed that MnFe-LDH had a large specific surface area,a rich crystalline phase composition,and a functional group structure.The RhB degradation rate of MnFe-LDH/PMS/O3 was 0.34 min-1,which was much higher than that of other comparative systems.RhB could be completely degraded in 10 min after optimization and had a significant effect on TOC removal.The system was found to be effective over a wide pH range.Common anions were largely unaffected and humic acid acted as an inhibitor.At the same time,the system had generally effective degradation performance for different dyes.Combined with quenching experiments and EPR,it was found that SO4·-,·OH,O2·-,and 1O2 all participated in the reaction,and·OH contributed more.The degradation pathway of RhB was derived by LC-MS,and the T.E.S.T.evaluation found that the toxicity of the intermediate product was significantly reduced.Finally,the stability and availability of LDHs were verified using cycling experiments and metal ion leaching.This work provides a theoretical basis and data support for the synergistic catalysis of PMS/O3 and the deep treatment of dye wastewater.
Key Laboratory for Environmental Pollution Prediction and Control of Gansu Province,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
Key Laboratory of Pollutant Chemistry and Environmental Treatment,College of Chemistry and Environmental Science,Yili Normal University,Yining 835000,China
新疆维吾尔自治区自然科学基金Yili Normal University's Special Project on Enhancing Comprehensive Strength of Disciplines(China)Research and Innovation Team Cultivation Program of Yili Normal University(China)
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