Impact of Nonaqueous Phase Liquid on Cr(VI) Removal by Nano Zerovalent Iron Particles: Effects of Contact Time, Pollution Load, and pH

Nanoscale zerovalent iron (nZVI) was synthesized and employed for treating chromium(VI) containing aqueous solution through adsorption using a series of microcosm experiments. The experiments were then performed to study the effects light nonaqueous phase liquid, toluene, on Cr(VI) removal by nZVI. Results showed that maximum efficiency almost 90% achieved within 300 min treatment process, while it suppressed approximately 25% in toluene’s copresence. found be higher (>80%) at pH 3–7 reduced 30.3% 9. No significant change observed due under copresence (57%–65% all ranges). also from 62.7% 37.1% 82.1% 28.3% with an increase concentration (25–200 mg/L), without coexisting respectively. surface morphology structure nZVI pre- posttreatment toluene analyzed scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy. results confirmed presence surface. best described pseudo-second-order kinetics (R2 = 0.97 both cases) Langmuir isotherm equilibrium model 0.95, 0.81). capacity (Qmax) 64.52 58.47 mg/g particles, Findings this provide crucial information about cocontamination its noticeable remediation contaminants concern.