研究目的
To synthesize Cu-doped Ti-containing MCM-41 and evaluate its photocatalytic performance for indoor air purification, specifically targeting formaldehyde degradation.
研究成果
Ti/Cu-MCM-41 showed the most efficient photocatalytic degradation of formaldehyde and best adsorption property due to its strongest hydrophilism. The incorporation of copper also improved its visible-light photocatalytic performance.
研究不足
The reaction process of the gas-solid heterogeneous photocatalysis is considerably slow because of the low contact efficiency between TiO2 and pollutants in ambient temperature and pressure.
1：Experimental Design and Method Selection:
The catalysts were synthesized in a mild way and characterized by X-ray diffraction, nitrogen physisorption, UV-visible spectroscopy, high resolution-transmission electron microscopy, and X-ray photoelectron spectroscopy.
2：Sample Selection and Data Sources:
Samples included MCM-41, Ti-MCM-41, Cu-MCM-41, and Ti/Cu-MCM-41, prepared using copper nitrate trihydrate, tetrabutyl titanate, tetraethyl orthosilicate, and cetyltrimethyl ammonium bromide.
3：List of Experimental Equipment and Materials:
Instruments used included a Rigaku D/max-2200/PC XRD instrument, Micromeritics ASAP 2010 system, JEM100-CX high resolution-transmission electron microscopy, UV/Vis Spectrometer (Lambda 950), and RBD upgraded PHI-5000C ESCA system.
4：Experimental Procedures and Operational Workflow:
The synthesis involved dissolving CTAB in ethanol, adding Cu(NO3)2·3H2O, TEOS, and ammonia, followed by stirring, filtering, washing, drying, and calcination. TiO2 hydrosol was synthesized and used to prepare Ti/Cu-MCM-41 by immersion.
5：Data Analysis Methods:
The physical and physiochemical properties were characterized, and photocatalytic performance was evaluated by gas-phase photodegradation tests.
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