Degradation of Aqueous Rhodamine B by Sunlight-Fenton Process

• Main Authors: WEI, TZ-BIN, 魏子斌
• Other Authors: Kuo, Chao-Yin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3c8c92

碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 106 === ABSTRACT In this study, the sunlight-Fenton was used to degrade the dye Rhodamine B in water. The Fenton and sunlight-Fenton processes were performed respectively in the experiments, and the effects of different concentrations of hydrogen peroxide and ferrous ions on the degradation of Rhodamine B were investigated. The concentration of Rhodamine B was 20 mg/L and the reaction time is 60 minutes. In the Fenton processes, the ferrous ion concentrations were 2.5, 3.0, 3.5, 4.0, and 4.5 mg/L, the hydrogen peroxide concentrations were 1.0, 2.0, 3.0, 4.0, and 5.0 mM. The results showed the residual ratio of Rhodamine B decreased significantly with the increase of ferrous ion concentration, compared with the hydrogen peroxide concentration. In the sunlight-Fenton processes, the ferrous ion concentration were 0.5, 1.5, and 2.5 mg/L, and the hydrogen peroxide concentration were 0.25, 0.5, and 1.0 mM. The results showed most Rhodamine B could be degraded to a residual ratio of 1% or less. In the kinetic model results, the Fenton and sunlight-Fenton processes were more consistent with the second order equation. In the COD results, the lowest residual ratio of Rhodamine B by the Fenton and sunlight-Fenton processes were 48.57% and 20.00% respectively. In the cost results, the optimum cost of the Fenton and sunlight-Fenton processes per metric ton of wastewater were 100.83 and 41.26 dollars respectively. This study proves the sunlight-Fenton process can effectively degrade the dye Rhodamine B in water than the Fenton process. The advantages of the sunlight-Fenton are that it degrades organic matter better and can significantly reduce the cost of adding chemicals. Keywords: Rhodamine B, sunlight, Fenton, sunlight-Fenton, cost