• 作者： Wen, Ten-Chin; Chang, Chia-Chin
• 中文摘要： 臭氧能夠在殺菌及分解酚化合物後不會殘留高毒性的有機鹵化物,所以臭氧在飲用水及廢水處理越來越受重視。本研究對利用 PbO/sub 2/陽極在中性磷酸鹽溶液中電解產生臭氧進行一系列研究。首先利用直交表實驗探討各因素對臭氧產生的影響效應,其中影響較大者有電流密度和陽極材料,其次為磷酸鹽和 KF濃度。產生的最佳操作條件為含有1.5M K/sub 2/HPO/sub 4/、0.6M KH/sub 2/PO/sub 4/和0.012M KF的溶液中,使用電流密度70A/dm/sup 2/可得臭氧效率為16%左右。在此種條件下PbO/sub 2/陽極壽命經測試達360小時以上,但是較高濃度的KF添加,反而會使PbO/sub 2/劣化並且有 PbO.bcdot.Pb/sub 3/(PO/sub 4/)/sub 2/生成在電極表面。
• 英文摘要： Ozone's ability to destroy viruses and decompose phenols without leaving harmful side products behind, has led to its increasing popularity as an environmentally clean oxidant in treatment of waste/ potable-water. A promising electrochemical system for ozone production consisting of a plain PbO/sub 2/-coated Ti anode and neutral phosphate electrolytes is examined in detail. This study, employ orthogonal array experimentation, examines ozone production via the electrolysis of water and was found to significantly depend upon current density and the choice of anodic material and to a lesser degree, upon the concentrations of fluoride and phosphate in water. A plain PbO/sub 2/-coated Ti anode demonstrates the best current efficiency (16%) in ozone production. Operating under a current density of 70A/dm/sup 2/ at an ambient temperature, this electrode achieved optimum ozone production in aqueous solutions containing 1.5M K/sub 2/HPO/sub 4/, 0.6M KH/sub 2/PO/sub 4/ and 0.012M KF, the service life of PbO/sub 2/ anode is much longer than 360 hrs for our test. Unfortunately, high concentrations of KF induce PbO/sub 2/ corrosion and transmutation to PbO.bcdot.Pb/sub 3/(PO/sub 4/)/sub 2/.
• 中文關鍵字： 臭氧; 直交表; 電解; 廢水; 二氧化磷陽極
• 英文關鍵字： Ozone; Orthogonal-Array; Electrolysis; Wastewater; Lead Dioxide Anode