Continuous Flow Process for Cr(VI) Removal from Aqueous Solutions Using Resin Supported Zero-Valent Iron

Area of Science:

• Environmental Science
• Materials Science
• Chemical Engineering

Background:

• Chromate (Cr(VI)) is a toxic pollutant requiring effective removal methods.
• Nanocomposite materials offer promising solutions for environmental remediation.
• Nano zero valent iron (nZVI) is known for its reductive capabilities.

Purpose of the Study:

• To evaluate the performance of a novel nanocomposite material for chromate reduction.
• To synthesize and characterize a nanocomposite of nano zero valent iron and cation exchange resin.
• To assess the efficiency of the R-nFe composite in column tests for Cr(VI) removal.

Main Methods:

• Synthesis of a nanocomposite material (R-nFe) using nano zero valent iron and Amberlyst 15 cation exchange resin.
• Utilized Green Tea extract for the reduction of Fe(III) to Fe(0) in the nanocomposite.
• Conducted three column tests with varying contact times (168 s, 744 s, 1260 s) to evaluate Cr(VI) removal.

Main Results:

• The nanocomposite material demonstrated effective removal of Cr(VI) from aqueous solutions.
• Chromate removal followed a first-order kinetic law.
• The chemical constant for Cr(VI) removal was determined to be 0.0526 min⁻¹.

Conclusions:

• The developed R-nFe nanocomposite is a highly effective material for chromate reduction.
• The study validates the use of cation exchange resins as host materials for nZVI in water treatment.
• The findings support the potential of this nanocomposite for industrial applications in wastewater treatment.