This work synthesized a novel AgS/K-g-CN photocatalyst which was effective in photocatalytic hydrogen production under simulated sunlight and visible light. Systematic investigation including TG, XRD, FT-IR, DRS, XPS, N-adsorption, SEM, TEM, PL, and photoelectrochemical analyses was executed to examine the structure, optical property and charge separation efficiency of the as-prepared photocatalysts. Result indicated that potassium was successfully doped into the g-CN framework via direct heating the mixture of melamine and potassium iodide at 520 °C, which increases the BET surface area, broadens the visible light response region, and elevates the separation efficiency of electron-hole pairs. The modification of AgS nanoparticles on the optimal K-g-CN sample further improves the surface charge separation efficiency via a type-II mechanism, which was believed to be the key role in photocatalytic reaction. The best AgS/K-g-CN hybrid shows a photocatalytic H generation rate of 868 and 96 μmol·g·h under simulated sunlight and visible light, respectively. This value is 2.7 and 1.3 times greater than that of g-CN and K-g-CN, respectively. Meanwhile, the AgS/K-g-CN displayed high photocatalytic stability. A probable mechanism of the synthesized photocatalyst was also suggested.
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| http://dx.doi.org/10.1016/j.jcis.2020.02.054 | DOI Listing |
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