Sustaining the efficiency of the Fe(0)/H2O system for Cr(VI) removal by MnO2 amendment.
作者： Marius Gheju , Ionel Balcu
DOI: 10.1016/J.CHEMOSPHERE.2018.09.129
关键词: Zerovalent iron 、 Aqueous solution 、 Manganese 、 Adsorption 、 Hexavalent chromium 、 Nuclear chemistry 、 Dissolution 、 Amendment 、 Chemistry 、 Groundwater remediation
摘要: Abstract This study aims to provide new knowledge regarding the effect of MnO2 co-presence on efficiency Cr(VI) removal with Fe(0). Non-disturbed batch experiments (≤40 days) were conducted using two types Fe(0) (milli- and micro-sized), concentrations (5 100 mg/L), in three different systems (“Fe(0) only”, “MnO2 “Fe(0) + MnO2”), at an initial pH value 6.9. Compared “Fe(0) only” system, rate highly promoted “Fe(0) + MnO2” system; moreover, while for system was severely hindered by increasing concentration, comparable high efficacies noticed both low concentration. Recycling indicated that total capacity up 48.1 times greater than system. Enhanced achieved doses MnO2, optimal mass ratio Fe(0):MnO2 4:1. The favorable synergistic observed ascribed accelerate oxidative dissolution, generate supplementary amounts secondary adsorbents/reductants ability towards Cr(VI). provides compelling evidence could represent a efficient cost-effective alternative abatement aqueous pollution.
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