研究目的
Investigating the photocatalytic activity of ZnBi2O4-graphite composites for the degradation of rhodamine B under visible-light irradiation.
研究成果
The ZnBi2O4-graphite composite exhibited excellent photocatalytic activity for the degradation of RhB under visible-light irradiation, attributed to the effective transfer of photogenerated electrons at the heterojunction interface, reducing the recombination of electron-hole pairs. The composite showed stable performance over four successive recycles, making it a promising photocatalyst for environmental remediation.
研究不足
The study focused on the degradation of RhB under specific conditions (e.g., initial concentration, catalyst loading, pH). The applicability to other pollutants or under different environmental conditions was not explored. The reusability of the catalyst was tested only up to four cycles.
1：Experimental Design and Method Selection
The study employed a co-precipitation method followed by calcination at 450°C to prepare ZnBi2O4-graphite composites. The photocatalytic activity was evaluated by measuring the degradation of RhB under visible-light irradiation.
2：Sample Selection and Data Sources
Rhodamine B (RhB) solutions at an initial concentration of 50 mg·L?1 were used as the target pollutant. The catalysts were tested at a concentration of 1.0 g per liter of solution.
3：List of Experimental Equipment and Materials
A 300 W halogen lamp (Osram, Germany) was used as the light source. Other materials included bismuth(III) nitrate pentahydrate, sodium hydroxide, graphite, zinc(II) nitrate hexahydrate, nitric acid, and rhodamine B.
4：Experimental Procedures and Operational Workflow
The suspension of the catalyst and RhB was stirred in a darkroom for 60 min to establish adsorption/desorption equilibrium, then irradiated by turning on the halogen lamp. Samples were taken at different time intervals, centrifuged to remove the catalyst, and the RhB concentration was determined by UV-Vis absorption at 554 nm.
5：Data Analysis Methods
The degradation kinetics of RhB were analyzed using pseudo-first-order kinetics. The rate constants (k) were calculated to compare the photocatalytic efficiency of different catalysts.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
