研究目的
Investigating the photocatalytic degradation of cyanide in aqueous solution using boron-doped zinc oxide under simulated solar radiation.
研究成果
The incorporation of boron in the form of B3+ in B-doped ZnO improved semiconductor properties by decreasing the crystallite size and the Eg value, enhancing its photocatalytic activity under simulated solar radiation compared to undoped ZnO. ZB1.5 showed better photocatalytic activity by degrading 89% of a 10 mg L-1 solution of CN-, compared to 75% that was reached by undoped ZnO. The evaluation of the stability and reusability of the ZB1.5 catalyst suggests that ZnO-B is a promising catalyst for environmental issues remediation allowing to treat contaminated water with cyanide by heterogeneous photocatalysis.
研究不足
The study did not evaluate the photocatalytic degradation of cyanide under natural sunlight. The reusability of the catalyst was only tested for three cycles.
1：Experimental Design and Method Selection:
The study evaluated the photocatalytic activity of boron-doped ZnO synthesized by sol-gel method on cyanide degradation under simulated solar radiation. A central composite faced design was used to maximize CN- photocatalytic degradation.
2：Sample Selection and Data Sources:
The study used potassium cyanide (KCN) solution adjusted to pH 11. The concentration of cyanide and intermediate ions was measured by ISE potentiometric method and UV-visible spectrophotometry, respectively.
3：The concentration of cyanide and intermediate ions was measured by ISE potentiometric method and UV-visible spectrophotometry, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study used a quartz batch reactor, solar simulator Suntest, XLS+ Heraeus, Germany, equipped with a daylight filter, ion selective electrode (ISE) (Thermo Orion 406), UV-visible spectrophotometer (Varian Cary 50 Scan UV-Vis spectrophometer), and atomic absorption spectroscopy (AAS) (Varian SpectrAA 220 FS).
4：Experimental Procedures and Operational Workflow:
Photocatalytic tests were carried out in a quartz batch reactor using 300 mL of KCN solution with constant stirring under simulated solar radiation until reaching an accumulated energy of 400 kJ m-2. The progress of the reaction was followed by taking aliquots every 50 kJ m-
5：The progress of the reaction was followed by taking aliquots every 50 kJ m-Data Analysis Methods:
2.
5. Data Analysis Methods: The data were analyzed in the statistical program Design Expert 7.0.0. The coefficient of determination (R2) and analysis of variance (ANOVA) were used to analyze the results and assess the statistical significance of the fitted quadratic models at 95% confidence level.
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