▎ 摘　　要

NOVELTY - Preparation of photocatalytic composite electrode comprises mixing n-butyl titanate and absolute ethanol, stirring to obtain first reactant; dissolving bismuth nitrate in dilute nitric acid to obtain second reactant, adding first reactant, stirring, dispersing graphene oxide, stirring for 5-6 hours, hydrothermally reacting at 100-140 degrees C for 12-24 hours under argon atmosphere, cooling to room temperature, separating solid and liquid, washing solid, and drying to obtain composite bismuth titanate/graphene oxide; and dispersing 5-7.5 g/L composite bismuth titanate/graphene oxide in mixture of water and absolute ethanol to obtain suspension; and polishing surface of glassy carbon electrode, coating with suspension, baking, applying surface with Nafion (RTM: perfluoro-sulfonic acid polymer) solution, and baking. The n-butyl titanate, cerium nitrate and graphene oxide have mass ratio of 1.36-5.44:1.185-7.47:2-4.6. USE - Method for preparation of photocatalytic composite electrode used for tetracycline-containing wastewater treatment (claimed). ADVANTAGE - The method is simple, easy, energy-saving and environment-friendly, and has low processing cost and high removal rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for tetracycline-containing wastewater treatment comprising adding wastewater to reaction vessel, adding sodium sulfate as electrolyte, adjusting pH to 5.52-6.68 using diluted hydrochloric acid, putting photocatalytic composite electrode as working electrode, platinum wire as counter electrode and saturated calomel as reference electrode, and oscillating at external voltage of 1-2.5 V in the presence of UV light.