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The particle size and distribution of AgNPs synthesised in the presence of three samples of coal humates used in this study under conditions of MW-assisted heating: (a) CHG, (b) CHL, (c) CHP, and under conditions of conventional heating: (d) CHG, (e) CHL, and (f) CHP. The AgNPs synthesised with MW irradiation in the presence of FAs are shown in (g).
