Kinetics of hexavalent chromium removal from water by chitosan-Fe0 nanoparticles.

摘要: Abstract Chitosan-Fe 0 nanoparticles (chitosan-Fe ) were prepared using nontoxic and biodegradable chitosan as a stabilizer. Batch experiments conducted to evaluate the influences of initial Cr(VI) concentration other factors on reduction surface chitosan-Fe . The overall disappearance may include both physical adsorption onto subsequent Cr(III). rate Cr(III) can be expressed by pseudo-first-order reaction kinetics. constants increase with in temperature iron loading but decrease pH. apparent activation energy is found 33 kJ mol −1 , which characteristic chemically controlled reaction. Characterization high-resolution X-ray photoelectron spectroscopy reveals that after reaction, relative Fe(0), Fe(III) are predominant species Chitosan has also been inhibit formation Fe(III)–Cr(III) precipitation due its high efficiency chelating ions. This study demonstrates potential become an effective agent for situ subsurface environment remediation.