Abstract
Novel and facile method for the preparation of AgCl/Ag nanoparticles supported on exfoliated montmorillonite which reduced partial Ag+ ions to Ag0 in one step at room temperature is reported for the first time. In this method, organically modified montmorillonite (OMMT) serves as a mild and effective reducing agent for Ag+ ions, and acts as an outstanding stabilizer for the resulting AgCl/Ag nanoparticles. Owing to the larger basal spacing [d(100)] for OMMT, AgCl/Ag nanoparticles spread on the thin layers of exfoliated montmorillonite could improve the photocatalytic activity by exposing higher surface area. As expected, AgCl/Ag/montmorillonite materials exhibit high visible-light catalytic activity due to the separation of photogenerated electron–hole through surface plasmon resonance (SPR) effect. The studies showed that the degradation of methylene blue (MB) can be completed in 20 min illumination under visible light. The photocatalysis mechanism of separation of the photogenerated electrons and holes at the AgCl/Ag/montmorillonite nanocomposites was also discussed.
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