Decolorization of Textile Wastewater by The Hybrid UV/TiO2/Ultrasound System 鍾富鳳、吳忠信
E-mail: [email protected]
ABSTRACT
This study combined ultrasonic bath (USB) and/or ultrasonic probe (USP) with UV/TiO2 to evaluate the decolorization efficiency for textile wastewater. The parent compound was selected as C.I. Reactive Red 2 (RR2). The effects of dye concentration, TiO2 dose, pH, wavelength of light and the combination of USB/USP were determined in this research. The experimental data indicated that the decolorization efficiency increased with the dye concentration and pH declining. The optima TiO2 dosage was found as 2 g/L. This work found that the decolorization rate fitted with the pseudo-first-order kinetics. The decolorization rate of 254 nm irradiation was higher than that of 365 nm. Additionally, the addition of NaCl promoted the decolorization rate. This study demonstrated the decolorization rate constants followed the order UV/TiO2/USB/USP > UV/TiO2/USB > UV/TiO2/USP >
UV/TiO2. The experimental data indicated that the combination of USB/USP with UV/TiO2 accelerated the decolorization significantly; however, the influence of the combination of USB/USP with UV/TiO2 was insignificantly. The addition of C2H5OH inhibited the decolorization rate of UV/TiO2-related systems; hence, this research suggested that the hydroxyl radicals were the main oxidation reagents. However, the addition of C2H5OH did not terminate the decolorization; accordingly, the oxidation of electron holes could not be ignored in UV/TiO2-related systems.
Keywords : UV ; TiO2 ; dye ; ultrasonic
Table of Contents
目錄 封面內頁 簽名頁 授權書………iii 中文摘要………
………iv 英文摘要………v 誌謝………
………vi 目錄..………
………vii 圖目錄………x 表目錄………
………xv 第一章 前言…… ……… …… ………1 1-1 研究緣起………
………1 1-2 研究動機……… …… … … ………1 第二章 文 獻回顧………3 2-1 染整廢水………
…………3 2-1-1 染整廢水對台灣河川污染情況.………...…….………..3 2-1-2 染料介紹….……...……..…. ……….
….…….5 2-1-3 反應性染料….………...……… .. ………...6 2-1-4 染整廢水之處理…….…...……..…... …………
……...7 2-2 二氧化鈦/紫外光之光催化反應……..….……….… ...….13 2-2-1 光化學理論.………....…………
……13 2-2-2 光化學反應類型… ….… ….………...13 2-2-3 光化學氧化技術…..…… .… …… … …
…..15 2-2-4 二氧化鈦物化特性...…………..… … … … ………....20 2-2-5 二氧化鈦之用途及應用……….………
…21 2-3 超音波…...……… … … ...…….…..22 2-3-1 超音波簡介…….…………..……….……….……
…....22 2-3-2 超音波應用型態.………….………...…………...…….24 2-4高級氧化程序之相關文獻整理..………..………
……...26 2-4-1 TiO2劑量影響………..……….27 2-4-2 pH值影響………….………
……..27 2-4-3 溫度的影響……….……….…28 第三章 實驗材料與方法…………....………
…....………34 3-1實驗材料……….…………..….…………..34 3-2實驗設備…..…….. … … … .… … … . ………..34 3-3 實驗步驟… …..… .… ……… .… … ………...35 3-3-1 前置作業…….………..…………...
………..……35 3-3-2 背景實驗………….….………… … … .… … … …. ..36 3-3-3 異相光催化反應.……….…...…………
…………38 3-3-4 實驗結合………..…… ……….… .… … … …40 3-4 實驗試程 ………..………
……… .…44 第四章 結果與討論………...……….. ..47 4-1 光催化反應背景實驗………..…...
.………..47 4-1-1直接光解實驗……….………...47 4-1-2未照光實驗………
…….…………...49 4-1-3 超音波實驗...…...50 4-2 異相光催化實驗..………
………...52 4-2-1 RR2濃度效應………..………52 4-2-2 TiO2濃度效應………
………..…………54 4-2-3 pH效應實驗………...……….….56 4-3 複合系統實驗..………..………
………….………....58 4-3-1 UV/TiO2/USB不同初始濃度………..58 4-3-2 UV/TiO2/USB 不同TiO2劑量添 加………....60 4-3-3 UV/TiO2/USB 之溶液pH值的影響………..…….62 4-3-4 UV/TiO2/USP不同初始濃度…
………...64 4-3-5 UV/TiO2/USP 不同TiO2劑量添加……….66 4-3-6 UV/TiO2/USP 之溶液pH值
的影響..……….68 4-3-7 UV/TiO2/USB/USP 不同初始濃度的影響.... …...70 4-3-8 UV/TiO2/USB/USP不 同TiO2劑量添加………..75 4-3-9 UV/TiO2/USB/USP 之溶液pH值的影響..…………...80 4-3-10 鹽類添加…………
…...…….………. …………..86 4-3-11 溫度的影響...………..89 4-3-12 抑制劑添加的影
響...94 第五章 結論與建議………...……….96 5-1 結論………
………....…....96 5-2 建議………...………….97 參考文
獻... ……….98 附錄……….………...…….. …………
…104
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