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Silver nanoparticles were immobilized on magnetic polyallylamine (PAA) decorated g-C 3 N 4  by using  Heracleum persicum  extract as a biological reducing and stabilizing agent. The resulting nanocomposite, Fe 3 O 4 -g-C 3 N 4 -TCT-PAA-Ag, was then characterized using BET, VSM, XRD, TGA, FTIR, TEM, EDS and ICP. The catalytic performance of the synthesized nanocatalyst was considered in the reduction of rhodamine B, and methyl orange in the presence of sodium borohydride in the aqueous medium at room temperature. The results showed that Fe 3 O 4 -g-C 3 N 4 -TCT-PAA-Ag nanocomposite could promote both reduction reactions efficiently in very short reaction times (70–100 s). In addition, Fe 3 O 4 -g-C 3 N 4 -TCT-PAA-Ag could be magnetically recovered and recycled for several cycles with no significant decrease in its catalytic performance. Using the experimental results, the rate constant, enthalpy, and entropy of the reduction reactions of both dyes were estimated.

Green synthesis of Ag NPs on magnetic polyallylamine decorated g-C3N4 by Heracleum persicum extract: efficient catalyst for reduction of dyes