研究目的
To optimize the process parameters for photocatalytic degradation of Yellow 2G dye using TiO2 and UVA light through Box-Behnken experimental design and kinetic study.
研究成果
The photocatalytic degradation of Y2G using TiO2/UVA is effective, with optimal conditions yielding 96.19% degradation. The process follows pseudo-first-order kinetics and is well-described by the modified Langmuir-Hinshelwood model. RSM with BBD is a feasible method for optimization, showing high model accuracy (R2 = 0.999). Future studies could explore broader parameter ranges and real wastewater applications.
研究不足
The study is limited to specific ranges of parameters (pH 2-4, TiO2 dosage 0.5-1.5 g L?1, initial Y2G concentration 20-40 mg L?1) and a batch reactor system; scalability to continuous flow or industrial applications is not addressed. Potential limitations include light scattering and catalyst aggregation at high TiO2 dosages, and interference from dye molecules at high concentrations.
1：Experimental Design and Method Selection:
The study used a Box-Behnken design (BBD) under response surface methodology (RSM) to optimize parameters (pH, TiO2 dosage, initial Y2G concentration) for photocatalytic degradation. A batch reactor system with UVA light was employed.
2：Sample Selection and Data Sources:
Commercial Yellow 2G dye (Acid Yellow 17) was used without purification, sourced from Realkom Denim Textile Factory. Solutions were prepared in purified water.
3：List of Experimental Equipment and Materials:
A cylindrical batch photoreactor (
4：6 L operating volume, 1 L working volume) with Pyrex glass components, a Philips PL-L UVA 36 W lamp (315–380 nm), air diffuser system, Merck Pharo 100 spectrophotometer for analysis, TiO2 catalyst (Sigma-Aldrich, Product Code:
14021), NaOH and H2SO4 for pH adjustment, and centrifugation equipment.
5：Experimental Procedures and Operational Workflow:
Experiments involved stirring and aerating Y2G solutions with TiO2 in the dark for 30 min to reach adsorption equilibrium, followed by UVA irradiation for 180 min. Samples were taken at intervals, centrifuged to remove TiO2, and analyzed spectrophotometrically at 390 nm.
6：Data Analysis Methods:
Data were analyzed using Minitab Software (version 17.0) for ANOVA and RSM. Kinetic analysis used the modified Langmuir-Hinshelwood model, with degradation efficiency calculated as (Ci - Cf)/Ci * 100%.
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