The experimental study of Cr6+ contaminated water remediation by zero-valent nano-Fe

摘要

In recent years, researchers have developed a number of new types of zero-valent nano-Fe remediation materials applied in the remediation of contaminated soil and water, which has attracted wide attentions. This paper selected soil leaching wastewater severely contaminated by chromium as target of the study and chose zero-valent nano-Fe, Na2SO3 and NaHSO3 for comparison experiments to study the effects on removing Cr6+ under experimental conditions of different pH values, dosages and reaction times. As is shown in the experiments, zero-valent nano-Fe has the highest removal rates for Cr6+, while the reaction of Na2SO3 is the slowest under the same conditions. However, both removal rates are prone to be stable after 10 min. Dosages do not make a distinct difference and the pH value has the least effect on the repair of zero-valent nano-Fe.