以電化學為基礎之高級氧化程序處理鄰苯二甲酸二甲酯之研究

Abstract

本研究內容以電化學氧化程序(electrochemical oxidation process, EC)為基礎，並結合臭氧程序(electrochemical ozonation, EC/OZ)、光化學(photo electrochemical oxidation, EC/UV)及光電化學臭氧化程序(photo electrochemical ozonation, EC/OZ/UV)等高級氧化程序(advanced oxidation processes, AOPs)處理dimethyl phthalate (DMP)之研究。探討不同電壓(EV)、pH值及臭氧濃度(CO3, in)等參數對DMP分解效率(ηDMP)與總有機碳(total organic carbons, TOCs)去除率(ηTOC)之影響。 研究結果顯示，以EC程序處理DMP，EV = 4 volts (V)，反應時間(t)達80 min後，ηDMP = 8%，但僅將其分解形成其他有機副產物，無法將之礦化。使用EC/UV程序處理DMP於EV = 4 V, PUV = 100 Watts(W), t = 80 min時，其ηDMP及ηTOC分別為47.5及11.5%，較UV程序之30.4及5.7%為佳。提供CO3, in為10 mg L-1的O3及EV = 4 V，以EC/OZ程序處理DMP，於t = 80 min，其ηDMP及ηTOC分別可達94.4%及4.2%。若固定EV = 4 V，將CO3, in由10增加為16 mg L-1時，於t = 80 min時，ηDMP可提升至99%，且ηTOC可提高為30%。而EC/UV/OZ程序處理DMP，當EV = 4 V、PUV = 100 W及CO3, in = 10 mg L-1之條件下在60 min內，即可完全分解DMP，當t = 80 min後，ηTOC可達62.7%。若將CO3, in增加到30 mg L-1時，在t = 80 min後，其ηTOC可提升至88.3%。

This study investigated the treatment of dimethyl phthalate (DMP) via various oxidation proesses such as 1) electrochemical oxidation (EC), 2) ozonation (OZ) with EC (EC/OZ), 3) ultraviolet (UV) with EC (EC/UV) and 4) photo ozonation with EC (EC/OZ/UV). The efficiencies of decomposition of DMP (ηDMP) and mineralization of total organic carbons (ηTOC) were evaluated under different operation voltages, pH values and concentrations of applied ozone (CO3, in). The results showed that ηDMP is about 8% at reaction time (t) of 80 min, under the EC process with EV = 4 V. During the EC/UV process with EV = 4 V, PUV = 100 watts (W), the ηDMP and ηTOC are 47.5 and 11.5%, respectively. These are higher than 30.4 and 5.7% under UV process. However, the ability of oxidation in terms of ηTOC under EC process is too weak. For the EC/OZ process with EV = 4 V and CO3,in = 10 mg L-1, ηDMP and ηTOC are 94.4 and 4.2%, respectively, after t = 80 min. An increase of CO3, in from 10 to 16 mg L-1 further increases ηDMP to 99% and ηTOC to 30% after t = 80 min. As for the EC/UV/OZ process with Ev = 4 V, CO3, in = 10 mg L-1 and PUV = 100 W, the DMP was nearly completely decomposed at t = 60 min, while the ηTOC is 62.7% after t = 80 min. In case of CO3, in increased from 10 to 30 mg L-1, the value of ηTOC raises to 88.3% after t = 80 min.