Factorial Experimental Design for the Elimination of Cationic Dye Stuff from Aqueous Solution via a Novel sediment–alga–silver Nanocomposite

Document Type : Original Article

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National Institute of Oceanography and Fisheries, NIOF, Egypt

Abstract

One of the major concerns regarding water pollutants is dyes, which are prevalent in textile industrial wastewater. The present work studied the elimination of methylene blue (MB) dye from the aqueous medium through adsorption utilizing a novel, ecofriendly and cost-effective nanocomposite (sediment–alga–silver nanocomposite). The composite was prepared from the marine red alga Jania rubens and sediment enhanced by synthesized silver nanoparticles (AgNPs). It was distinguished by FTIR and SEM. A statistical model was used to evaluate the sorption efficiency of MB by the nanocomposite. The independent variables and their levels included a pH of (4–10), an adsorbent dosage (0.05–0.3 g/L), contact time (10–60 min) and an initial dye concentration (10–100 mg/L). The obtained data were analyzed statistically to define the most efficient combinations of independent parameters controlling the process. The maximum removal percentage (86.98%) was obtained at pH (8.5), adsorbent dosage (0.2375 g/L), contact time 47.5 min. and initial concentration (32.5 mg/L). The kinetic data correlated best with the pseudo-second-order model, while the isotherm data were better fitted to Freundlich and Langmuir isotherms. The calculated values of Temkin and Freundlich constants suggested a physical adsorption process of MB onto composite.

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History

  • Receive Date: 05 August 2024
  • Revise Date: 02 September 2024
  • Accept Date: 16 September 2024

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