結合電化學與高級氧化程序處理偶氮性染料Reactive Black 5之研究

Application of Combined Electrochemical and Advanced Oxidation Processes on the Treatment of Azo Dye Reactive Black 5

朱相羽(Hsiang-Yu Chu)

指導教授 ： 張慶源

國立臺灣大學/工學院/環境工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.01639

摘要

本研究內容為以電化學氧化程序 (electro-chemical oxidation process, ECO)為基礎，並結合光化學 (photo-electro-chemical oxidation, UV/ECO)、臭氧程序(electro-chemical ozonation, OZ/ECO)及光化學臭氧化程序 (photo-electro-chemical ozonation, UV/OZ/ECO)等高級氧化程序 (advanced oxidation processes, AOPs)處理Reactive Black 5 (RB5)染料之研究。探討不同電壓 (Ev)、紫外光之功率 (PUV)、臭氧濃度 (CO3,in)及pH值等參數對RB5分解效率 (ηRB5)、真色色度 (American Dye Manufacturers Insititute, ADMI)去除率 (ηADMI) 及總有機碳 (total organic carbons, TOCs)去除率 (ηTOC) 之影響。
研究結果顯示，ECO程序中，Ev = 1.5 volts(V)時，以ECO程序處理RB5，其反應時間(t)達2 h 後，ηRB5 及ηADMI 分別可達71及75％，但僅能將其分解形成其他有機副產物，而其ηTOC ≦ 2％，顯見無法將之完全礦化。使用UV/ECO程序(Ev = 1.5 V, Pw = 13 watts(W), t = 2 h)處理RB5，其ηRB5 及ηADMI 可分別提升至99及92％，但仍無法提升TOC去除率，其ηTOC ≦ 5％。提供CO3,in為16 mg L-1之O3及Ev = 1.5 V，以OZ/ECO程序處理RB5，於t = 30 min，即可將RB5及真色色度完全去除 (ηTOC = 27%)，而在t = 2h，ηTOC可達64％，均較ECO及OZ程序之2及33％為佳(於t = 2 h, OZ之ηRB5 及ηADMI 均> 99%)。於OZ/ECO程序中，將Ev 由 1.5提高至3 V時，經2 h反應後，其ηTOC由64提高為84％(其ηRB5 及ηADMI 均 > 99%)。而OZ/ECO程序中，固定Ev = 1.5 V，當CO3,in 由 16增加為20 mg L-1時，於t = 2h時，ηTOC由64提高為88％ (ηRB5 及ηADMI 均 > 99%)。以UV/OZ/ECO程序處理RB5，當Ev = 1.5 V、PUV = 13 W及CO3,in= 16 mg L-1之條件下在15 min內，ηRB5 及ηADMI 均 > 99% (ηTOC = 22%)。當t = 45min時，ηTOC即可達94％。若將CO3,in增加至20 mg L-1時，在45min內即可將有機物完全礦化成CO2及H2O (ηTOC > 99%)。

關鍵字

RB5 ； 電解 ； 電化學氧化 ； UV ； 臭氧 ； 高級氧化

並列摘要

This study investigated the treatment of Reactive Black 5 (RB5) dye via various oxidation processes such as 1) electro-chemical oxidation (ECO), 2) combined ultraviolet (UV) with with ECO (UV/ECO), 3) ozonation with ECO (OZ/ECO) and 4) photo-ozonation with ECO (UV/OZ/ECO). On the efficiencies of decomposition of RB5 (ηRB5), true color removal (ηADMI, ADMI = American Dye Manufacturers Insititute) and total organic carbon removal (ηTOC), respectively. Effect of votage (Ev), power of UV (PUV), concentration of applied ozone (CO3,in) and pH value were evaluated.
The results showed that ηRB5 and ηADMI were about 71 and 75% at reaction time (t) of 2 h, for the ECO process with Ev = 1.5 volts (V). However, ηTOC was less than 2%. For the UV/ECO processes with Ev = 1.5 V and PUV = 13 watts (W), ηRB5, ηADMI and ηTOC were 99, 92 and 2% at t = 30 min, and 99, 99 and 5% at t = 2h. The results indicated that the introduction of UV enhances the ηRB5 and ηADMI, significantly, while the ηTOC moderately.During OZ/ECO processes with CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled in 30 min and with ηTOC increased to 64% at 2 h. The corresponding ηRB5 , ηADMI and ηTOC for the sole OZ process were 99, 99 and 27%, and ηTOC = 64% at t = 2 h.
Increaseing Ev from 1.5 to 3 V for the OZ/ECO, resulted in an increased of from 64 to 84% in 2 h. An increase of CO3,in from 16 to 20 mg L-1 further increased ηTOC 64% to 94% at 2 h for the OZ/ECO processes. As for the UV/OZ/ECO processes with PUV = 13 W, CO3,in = 16 mg L-1 and Ev = 1.5 V, RB5 and true color were almost completely removaled at 15 min with ηTOC = 22%. The values of ηTOC 94% at 45 min. As CO3,in increased from 16 to 20 mg L-1, TOC was almost removal in 45 min.

並列關鍵字

RB5 ； electrolysis ； electro-chemical oxidation ； UV ； ozone ； AOPs

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