Journal of Water and Wastewater Science and Engineering

Journal of Water and Wastewater Science and Engineering

Chromium Removal from Aqueous Solutions Using Fixed Bed Continuous Reactor with Ammonium Bromide Ligand-Modified Nanozeolite Spherical Granules

Document Type : Original Article

Authors
1 M.Sc., Department of Environmental Sciences and Engineering, Faculty of Environmental Sciences, Hakim Sabzevari University, Sabzevar, Iran.
2 Associate Professor, Department of Environmental Sciences and Engineering, Faculty of Environmental Sciences, Hakim Sabzevari University, Sabzevar, Iran.
Abstract
According to the standards set by the WHO, hexavalent chromium at a high concentration of 50 µg/L poses significant risks to human health. In this study, clinoptilolite was converted into nanozeolite using a ball mill and modified with the surfactant HDTMABr. Spherical granules were produced through a thermal method and shaped in an extruder machine. According to the XRF test, the most composition of nanozeolite is quartz, and according to the XRD test, the dominant species is clinoptilolite. DLS and TEM images show the size of nanozeolite particles between 50 and 400 nm. Thomas and Bohart-Adams models were employed to predict column behavior. It was found that the adsorption capacity increases with decreasing pH, flow rate, and initial concentration, while it decreases with reduced height. The maximum adsorption efficiency was achieved under optimal conditions: a height of 54 cm, a pH of 2, an initial concentration of 5 mg/L, and a flow rate of 1 L/h, resulting in an adsorption capacity of 23.60 mg/g and an efficiency of 98.33%. The modified clinoptilolite nanozeolite demonstrates high efficiency in chromium removal, and due to its availability and low cost, it presents a viable method for chromium removal in industrial and environmental applications.
Keywords

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Volume 10, Issue 1
Spring 2025
Pages 49-60

  • Receive Date 15 August 2024
  • Revise Date 29 October 2024
  • Accept Date 30 November 2024