研究目的
Studying the degradation kinetics of hazardous organic chemicals exemplified by dye in a coupling PEC and PEF over dual anodes in a system of undivided electrochemical cell.
研究成果
The coupling PEC/PEF process using a dual-anode system effectively degrades orange G dye with high efficiency, following pseudo first-order kinetics. Optimal performance is at pH 3 due to enhanced hydroxyl radical production. The process reduces sludge production and treatment costs compared to conventional methods, with significant mineralization indicated by TOC and COD removal. Future studies could focus on mechanistic details with advanced analytical techniques.
研究不足
The study is limited to specific conditions such as pH range (3-5), current densities, and dye concentration. Potential optimizations include exploring wider pH ranges, different electrode materials, and scaling up for industrial applications. The use of UV-Vis for intermediate identification may not be as precise as GC/MS or LC/MS techniques.
1：Experimental Design and Method Selection:
The study uses a dual-anode system with TiO2/Ti and stainless steel anodes in an undivided electrochemical cell to couple photoelectrochemical (PEC) and photoelectro-Fenton (PEF) processes for degrading orange G dye. The rationale is to enhance hydroxyl radical production through combined mechanisms. Theoretical models include pseudo first-order kinetics for degradation and steady-state approximation for hydroxyl radicals.
2：Sample Selection and Data Sources:
The reaction solution contains 0.1 mM orange G dye and 0.1 M Na2SO4 at pH 3–5. Samples are collected at specific time intervals for analysis.
3：1 mM orange G dye and 1 M Na2SO4 at pH 3–Samples are collected at specific time intervals for analysis.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes TiO2/Ti mesh anode prepared by electrophoretic deposition, stainless steel anode, graphite cathodes, UV lamp (Entela UVGL-25, 8 W, 365 nm), power supply, O2 gas diffuser, spectrophotometer (Metertech SP-8001), SEM for electrode characterization, TOC analyzer (Shimadzu TOC-L series), and COD measurement setup. Materials include P25 TiO2 powder, Ti mesh, isopropanol, Zn(NO3)2, HCl, Na2SO4, FeSO4, and analytical reagents for Fe2+ and H2O2 determination (TPTZ and DPD methods).
4：Experimental Procedures and Operational Workflow:
The TiO2/Ti electrode is prepared by treating Ti mesh with HCl, electrophoretic deposition of P25 TiO2, annealing, and characterization. Electrochemical experiments are conducted in a cell with dual anodes and cathodes, constant O2 flow (200 mL min?1), UV irradiation, and applied currents (75 and 45 μA cm?2 for TiO2/Ti and SS anodes, respectively). Samples are analyzed for OG concentration, Fe2+, H2O2, TOC, and COD over time.
5：Data Analysis Methods:
Data analysis involves kinetic fitting using pseudo first-order models, statistical techniques like least squares method, and software tools for regression (not specified). UV-Vis spectra are used to identify intermediates and degradation pathways.
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