本研究製備Ti/PbO2以修飾活性碳電極 (Ti/PbO2/AC)，做為電氧化的電極，以處理水中偶氮染料 (acid orange 7, AO7)。研究中對製備條件，如合成Ti/PbO2的TiO2濃度與Ti/PbO2與活性碳的比例，以及電吸附/氧化的處理條件，如pH, 濃度, 以及電場強度等進行探討，並且對所製備的電極進行表面分析，如比表面積/孔洞分布、表面晶相，以及表面官能基等分析。由於AO7的去除受電吸附與電氧化影響，且加入Ti/PbO2後可能增加了電催化的功能，OH自由基的存在有助於AO7的去除，因此當pH為10，外加電壓為1.2 V，AO7濃度為50 ppm時，有最佳的去除率。於同一條件下的與活性碳電極相比，活性碳電極與Ti/PbO2/AC電極的AO7去除率分別為85.9%與91.7%，顯示添加Ti/PbO2能夠提升AO7的去除能力。此外，由於活性碳的孔洞特性以及Ti/PbO2的催化能力，孔洞擴散模式與Langmuir-Hinshelwood 兩模式皆能夠解釋AO7去除的動力;In this study, the Ti/PbO2 composite was synthesized to modify AC electrodes. The AC electrodes and Ti/PbO2/AC electrodes are used for electrochemical oxidation of acid orange 7 (AO7). The surface chemistry of electrodes was analyzed by SEM, ASAP, FTIR and cyclic voltammetry. The effects of the spacing of anode and cathode, initial dye concentration, applied voltages, solution pH on the degradation of AO7 had been studied. Results revealed that at initial solution pH = 10, the spacing of anode and cathode of 3 mm, the applied voltage of 1.2 V, the initial AO7 concentration of 50 ppm the degradation efficiencies by AC and Ti/PbO2/AC electrode reached 85.90% and 91.70% , respectively after 720 min. It indicated that Ti/PbO2 composite has good catalytic effects on degradation of AO7. The reaction mechanism of electro-oxidation of AO7 degradation by Ti/PbO2/AC electrode might be involved the OH radical attack of dye molecules, and the degradation can be interpreted by the intra-particle diffusion kinetics model the Langmuir-Hinshelwood model.
