Removal of phenol in wastewater by ultrasound/persulfate combined with Ag/PbO

• Main Authors: CHANG, TANG-YAO, 張棠堯
• Other Authors: CHEN, WEN-SHING
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/k97euc

碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 107 === At a lot of industries, Phenol is widely used. Such as Petrochemical、Organic synthesis、Medicine……. But, It needs to pay attention to wastewater from process. So, The study will focus at removal efficiency of phenol. The phenol of wastewater was removed by ultrasound/persulfate combined with Ag/PbO. At the study, catalyst was made by impregnation method. BET、FT-SEM、XRD and XPS are used to test the catalyst after preparation. By BET analysis, the surface area of PbO went down after processing. But, surface area will increase when the weight percentage of Ag is increasing；The existence and weight percentage of Ag are analyzed by FT-SEM. The existence of Ag was sured at mapping image. At the result of EDS analyst, it’s trend that contents of Ag are more and more；After XRD analyzing, the catalyst consist of α-PbO、Ag and AgO can be judging by diffraction peak. By the change of XPS’s binding energy, the valence number of Pb was decreasing after reacting. The reason is Pb captures the electrons from Ag. In the study, the greatest degradation percentage is 99.74% when temperature of solution is 45℃、power of ultrasound is 1200W、catalyst(5% Ag/PbO) weight percentage is 0.2% and molarity of sodium persulfate is 0.084M. In the radical scavenger experiment, degradation rate was going down or not would be confirmed when something easily reacts with sulfate radical in wastewater. The degradation rate significantly dropped after adding methanol or ethanol. The importance of sulfate radical for study can be prove. The ion effect experiment is investigating the change of degradation rate when there is anion in wasewater. The results showed degradation rate decreased after adding chloride ion or sulfate ion.