研究目的
To investigate the influence of different surfactants on the synthesis of BiOCl/WO3 microcomposites for enhanced adsorption of organic dyes in aqueous solutions.
研究成果
The BiOCl/WO3-PVP composite exhibited the best adsorption performance with capacities of 21.50 mg/g for rhodamine B and 29.85 mg/g for methylene blue, following pseudo-second-order kinetics and Langmuir isotherm. The surfactant significantly influences morphology and adsorption efficiency, with good recyclability observed.
研究不足
The study is limited to specific surfactants and dyes; other contaminants or surfactants were not tested. The adsorption capacity may be affected by agglomeration and reusability degradation over multiple cycles. Optimization for industrial-scale applications was not addressed.
1：Experimental Design and Method Selection:
A one-step hydrothermal synthesis method was used to prepare BiOCl/WO3 microcomposites with surfactants PVP, TEG, and TX-
2：The rationale was to control morphology and enhance adsorption properties. Sample Selection and Data Sources:
1 Sodium tungstate dihydrate, bismuth nitrate pentahydrate, NaCl, and surfactants were procured from Sigma Aldrich. Dye solutions of rhodamine B and methylene blue were prepared.
3：List of Experimental Equipment and Materials:
Teflon beaker, Teflon-lined stainless-steel reactor, hot-air oven, magnetic stirrer, PANalytical X-ray diffractometer, JEOL JSM-7500F FESEM, TECNAI G2 F20 HRTEM, Bruker Vertex 80v FT-IR/Raman spectrophotometer, Varian Cary spectrophotometer, Micromeritics ASAP2010 surface-area analyzer, centrifuge, UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis at 180°C for 24 hours, followed by filtration, washing, and drying. Characterization using XRD, FESEM, TEM, FTIR, UV-DRS, and BET analysis. Batch adsorption studies with variations in adsorbent dose, pH, and dye concentration, with stirring at 500 rpm and centrifugation for sample separation.
5：Data Analysis Methods:
Adsorption percentage calculated using equations, kinetics fitted to pseudo-first-order and pseudo-second-order models, isotherms fitted to Langmuir and Freundlich models using linear regression.
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X-ray diffractometer
PANalytical
PANalytical
Used for acquiring power X-ray diffraction patterns to study crystal structures of the adsorbents.
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Field-emission scanning electron microscope
JSM-7500F
JEOL
Used for examining the morphologies of the adsorbents.
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High-resolution transmission electron microscope
TECNAI G2 F20
FEI
Used for high-resolution examination of the adsorbents, including lattice fringes and SAED patterns.
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FT-IR/Raman spectrophotometer
Vertex 80v
Bruker
Used for acquiring FTIR spectra to analyze functional groups of the adsorbents.
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UV-vis spectrophotometer
Cary
Varian
Used for acquiring UV-vis absorbance spectra of the synthesized adsorbents.
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Surface-area analyzer
ASAP2010
Micromeritics
Used for obtaining nitrogen adsorption-desorption isotherms to determine surface area.
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Teflon-lined stainless-steel reactor
Used for hydrothermal synthesis at high temperature and pressure.
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Hot-air oven
Used for drying the synthesized products.
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Magnetic stirrer
Used for stirring solutions during synthesis and adsorption experiments.
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Centrifuge
Used for separating adsorbent particles from dye solutions after adsorption.
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