| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 95 === The dye-house industry produces the large amount effluents yearly. Therefore, many researchers study the use of UV/TiO2 process to treat those dye-house effluents in order to effectively de-color and mineralize dye. The subject pollutants is RhB at the concentration of 50μM, pH 3.0, with 254 nm 30W *3 UV light. In order to photocatalyse RhB, K2Cr2O7 , KMnO4 , MnO2 , MnSO4 , FeCl3 were added to the solutions for studying synergistic or inhibition effects. In addition, the sol-gel method was used to produce titanium dioxide with chromium, manganese, iron ions to enhance the degradation of RhB.
The test results showed that the addition of chromium , manganese , iron ion to form the titanium dioxide in the sol-gel method did not change the crystalline structure. The specific areas of Degussa P25, sol-gel TiO2 , Fe/TiO2, Mn/TiO2, and Cr/TiO2 were 47.05、95.62、103.68、90.76 and 95.97 m2/g, respectively. The FT-IR analysis exhibit that all catalyst surfaces of materials have only function groups of -O-H.
The photocatalysis test showed the adsorption of 5%~10% of RhB on Degussa P25 and sol-gel TiO2. After eight hours of UV light, the Degussa P25 and sol-gel TiO2 in RhB solutions degrade 100% and 48%, respectively. With the sol-gel method with 1:1000 weight ratios of weight Fe/TiO2, Mn/TiO2, Cr/TiO2 the removals for RhB were 57%, 36%, and 45%. By adding Cr+6, Mn+7, Mn+4, Mn+2, and Fe+3, Degussa P25 wpuld remove RhB completely. While sol-gel TiO2 and Cr+6, Mn+7, Mn+4, Mn+2, and Fe+3, RhB removals were at 35%, 93%, 51%, 31%, and 65% after eight-hour UV light, respectively. The mechanism of those inhibition and synergistic effects are still un-clear and need more studies.
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