研究目的
To investigate the colloidal stability and photocatalysis of nano-TiO2 particles in the presence of fulvic acids (FA) and electrolytes (NaNO3, Na2SO4, Na3PO4) at different pH, and to study the influence of FA and electrolytes on photocatalytic degradation of atrazine by nano-TiO2, revealing the relationship between the photocatalytic activity and colloidal stability of nano-TiO2 in the presence of FA and electrolytes.
研究成果
The presence of FA and electrolytes significantly affects the colloidal stability and photocatalytic activity of nano-TiO2. FA enhances colloidal stability but inhibits atrazine removal by occupying active sites and consuming reactive oxygen species. Electrolytes, especially Na3PO4, reduce photocatalytic efficiency by increasing particle aggregation. The study provides insights into the complex interactions between nano-TiO2, FA, and electrolytes in environmental applications.
研究不足
The study focused on specific conditions (pH, FA, and electrolyte concentrations) and may not cover all environmental scenarios. The inhibitory effect of FA and electrolytes on atrazine removal was observed, but the underlying mechanisms could be further explored.
1：Experimental Design and Method Selection:
The study involved evaluating the colloidal stability and photocatalysis of nano-TiO2 particles in the presence of FA and electrolytes at different pH levels. The zeta potential and hydrodynamic diameter (HDD) of the particle suspensions were measured to assess colloidal stability. Photocatalytic degradation of atrazine was evaluated under UV irradiation.
2：Sample Selection and Data Sources:
Nano-TiO2 particles with an average size of 5–10 nm were used. FA and atrazine were purchased from chemical reagent companies. Electrolytes (NaNO3, Na2SO4, Na3PO4) were prepared from analytical reagent grade chemicals.
3：List of Experimental Equipment and Materials:
Nano ZS90 Malvern Zetasizer for zeta potential and HDD measurements, SEM for morphology analysis, FT-IR for functional group identification, HPLC for atrazine concentration analysis, and a photocatalytic simulator with a UV lamp for degradation experiments.
4：Experimental Procedures and Operational Workflow:
Nano-TiO2 suspensions were prepared with FA and/or electrolytes, stirred, and then measured for zeta potential and HDD. Photocatalytic degradation experiments were conducted in a cylindrical Pyrex glass cylinder under UV irradiation, with samples taken at intervals for HPLC analysis.
5：Data Analysis Methods:
Data on zeta potential, HDD, and atrazine concentration were analyzed to evaluate the effects of FA and electrolytes on colloidal stability and photocatalysis.
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