研究目的
To synthesize TiO2 nanoparticles using green methods by applying the green solvent obtained from the extract of Coffea arabica L. (or TiO2/C) and apply in removal of paraquat from aqueous solution.
研究成果
The combined TiO2/C with UV and H2O2 was the most effective photocatalyst for paraquat degradation, exhibiting a maximum 66.3% degradation of 50 mg/L over 90 min at pH 10. The green synthesis of TiO2 nanoparticles using Coffea arabica L. extract offers a low-cost and reproducible method for pollutant removal in water treatment.
研究不足
The study focused on the removal of paraquat using TiO2/C under specific conditions (pH, concentration of paraquat, presence of UV and H2O2). The efficiency might vary under different environmental conditions or with other pollutants.
1：Experimental Design and Method Selection:
The sol-gel synthesis of TiO2-loaded nanoparticles was used, with Coffea arabica L. extract as the solvent chemical.
2：Sample Selection and Data Sources:
Paraquat solutions with concentrations ranging from 5 to 50 mg/L were used.
3：List of Experimental Equipment and Materials:
Titanium tetraisopropoxide (TTiP), paraquat, glacial acetic acid, nitric acid, sulphuric acid, sodium hydroxide, deionised water, UV-Vis spectrophotometer, Liquid chromatography–mass spectrometry, TOC Carbon Analyzers, BET Surface Area Analyzer, Zetasizer.
4：Experimental Procedures and Operational Workflow:
Photocatalysis experiments were performed in a batch reactor with UV light source. The paraquat solution was treated in batch operation mode with steady temperature.
5：Data Analysis Methods:
The Langmuir-Hinshelwood model was used to describe the kinetics of paraquat degradation.
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