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

Pourya Mohammadi,Majid M Heravi,Samahe Sadjadi

doi:10.1038/s41598-020-63756-4

Pourya Mohammadi, Majid M Heravi + Show 1 more

Open Access

https://doi.org/10.1038/s41598-020-63756-4

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Abstract

Silver nanoparticles were immobilized on magnetic polyallylamine (PAA) decorated g-C3N4 by using Heracleum persicum extract as a biological reducing and stabilizing agent. The resulting nanocomposite, Fe3O4-g-C3N4-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 Fe3O4-g-C3N4-TCT-PAA-Ag nanocomposite could promote both reduction reactions efficiently in very short reaction times (70–100 s). In addition, Fe3O4-g-C3N4-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.

Highlights

Silver nanoparticles were immobilized on magnetic polyallylamine (PAA) decorated g-C3N4 by using Heracleum persicum extract as a biological reducing and stabilizing agent
Methyl orange (MO) and Rhodamine B (RhB) as common contaminants were chosen to investigate the catalytic efficiency of the Fe3O4-g-C3N4-TCT-PAA-Ag with sodium borohydride as a reducing agent
Fe3O4-g-C3N4-TCT-PAA-Ag without NaBH4, no considerable change in the concentration of dyes was observed (Conversion ~ 0%). These observations showed that neither nanocatalyst nor NaBH4 was able to reduce these dyes individually. Both Fe3O4-g-C3N4-TCT-PAA-Ag nanocomposite and sodium borohydride were required in the catalytic reduction of MO and RhB

Summary

Introduction

Silver nanoparticles were immobilized on magnetic polyallylamine (PAA) decorated g-C3N4 by using Heracleum persicum extract as a biological reducing and stabilizing agent. Methyl orange (MO) as an organic azo dye, is toxic dye that is broadly utilized as a chemical reagent in food, paper, leather, and textiles industries. It has been applied as a natural dye in several industries, and commonly discharged without additional treatment in the ecosystem. Rhodamine B (RhB), as a nitrogen-containing cationic dye, is broadly utilized in foodstuffs, and textiles, as well as a tracer fluorescent[9] This dye can undergo reductive anaerobic degradation and produced carcinogenic aromatic amines[10]. G-C3N4 displays good chemical stability18–20. g-C3N4 provides more applications than carbon materials due to the incorporation of nitrogen atoms in the carbon structure that can have great versatility and simplicity in designing and enhancement of its chemical, catalytically, electrical, and optical properties[21,22,23,24]

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