Decolorization of Rhodamine B by silver nanoparticle-loaded magnetic sporopollenin: characterization and process optimization

Ecer U., Şahan T., Zengin A., Gubbuk I. H.

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, vol.29, no.52, pp.79375-79387, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 52
  • Publication Date: 2022
  • Doi Number: 10.1007/s11356-022-21416-2
  • Journal Name: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, IBZ Online, ABI/INFORM, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, EMBASE, Environment Index, Geobase, MEDLINE, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Page Numbers: pp.79375-79387
  • Keywords: Ag nanoparticles, Decolorization, Fe3O4 nanoparticles, Sporopollenin, Rhodamine B, Response Surface Methodology, GREEN SYNTHESIS, ORGANIC-DYES, RECYCLABLE CATALYST, DEGRADATION, REDUCTION, COMPOSITE, ADSORPTION, POLLUTANTS, MECHANISM, REMOVAL
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

Silver nanoparticles (Ag NPs) were reduced on the surface of magnetic sporopollenin (Fe3O4@SP) modified with polydopamine to enhance the degradation capability for Rhodamine B (RhB). The polydopamine-coated Fe3O4@SP (PDA@Fe3O4@SP) acts as a self-reducing agent for Ag+ ions to Ag-0. The structural properties of the synthesized nanocomposite were determined using Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and vibrating sample magnetometer (VSM). The systematic study of the degradation process was performed using Response Surface Methodology (RSM) to determine the relationship between the four process variables, namely, initial RhB concentration, NaBH4 amount, catalyst amount, and time. Optimum points were determined for these four parameters using both matrix and numerical optimization methods. Under optimum conditions, RhB was decolorized with a yield of 98.11%. The apparent activation energy (E-a) and rate constant (k) for the degradation were 24.13 kJ/mol and 0.77 min(-1), respectively. The reusability studies of the Ag@PDA@Fe3O4@SP exhibited more than 85% degradation ability of the dye even after five cycles. As a result, Ag@PDA@Fe3O4@SP possessed high catalytic activity, fast reduction rate, good reusability, easy separation, and simple preparation, endowing this catalyst to be used as a promising catalyst for the decolorization of dyes in aqueous solutions.