title: Application of response surface methodology to the removal of the antibiotic tetracycline by electrochemical process using carbon-felt cathode and DSA (Ti/RuO2-IrO2) anode.
abstract: The removal of antibiotic tetracycline (TC) from water by electrochemical advanced oxidation process (EAOP) was performed using a carbon-felt cathode and a DSA (Ti/RuO(2)-IrO(2)) anode. The influence of applied current, initial pH and initial TC concentration on TC removal efficiency was investigated. Response surface methodology (RSM) based on Box-Behnken statistical experiment design (BBD) was applied to analyze the experimental variables. The positive and negative effects of variables and the interaction between variables on TC removal efficiency were determined. The applied current showed positive effect, while the initial pH value and initial tetracycline concentration gave negative effect on TC removal. The interaction between applied current and initial pH value was significant, while the interactions of initial TC concentration with applied current or initial pH were not pronounced. The results of adequacy check confirmed that the proposed models were accurate and reliable to analyze the variables of EAOP. The reaction intermediates were identified by high-performance liquid chromatography-mass spectrometry (LC-MS) technique and a plausible degradation pathway for tetracycline degradation was proposed. The acute toxicity experiments illustrated that the Daphnia magna immobilization rate reached the maximum after 240 min of electrolysis and then decreased with the progress of the reaction.
authors.affiliation: Department of Environmental Engineering, Wuhan University, Wuhan 430079, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Nihal
authors.initials: N
authors.lastname: Oturan
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Lu
authors.initials: L
authors.lastname: Chen
authors.forename: Mehmet A
authors.initials: MA
authors.lastname: Oturan
mesh_terms: D000900:Anti-Bacterial Agents / Q000032:analysis / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D004566:Electrodes; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007495:Iridium / Q000737:chemistry; D008956:Models, Chemical; D017975:Ruthenium Compounds / Q000737:chemistry; D013752:Tetracycline / Q000032:analysis / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D000077482:Carbon Fiber; D017975:Ruthenium Compounds; D014874:Water Pollutants, Chemical; C044458:iridium oxide; C029017:ruthenium dioxide; D007495:Iridium; D002244:Carbon; D014025:Titanium; D013752:Tetracycline