One-Pot Synthesis of Nanoscale Zero-Valent Iron Immobilized with Granular Activated Carbon
International Journal of Environmental Research(2018)
摘要
Activated carbon has widely been used to adsorb and remove various pollutants, but it is not an adequate treatment solution for degrading pollutants; rather, it merely transforms the pollutants from a liquid-phase to a solid-phase bound in the carbon matrix. In this study, we have investigated the immobilization of nanoscale zero-valent iron (nZVI) on granular activated carbon (GAC) for the purpose of providing redox reactivity towards water pollutants. Two representative processes for nZVI immobilization on granular activated carbon (GAC/Fe) were evaluated, and concluded by the suggestion of optimized conditions for synthesizing GAC/Fe composites. Both total iron content and Fe 0 content can be significantly influenced by the preparation process; therefore, it was important to avoid oxidation during preparation, to achieve the highest possible reduction capacity. The optimal condition for producing reactive GAC/Fe was determined to be immersing GAC in a Fe 2+ solution for 24 h, followed by the reduction of Fe 2+ to Fe 0 without an intermediate drying step. The reactivity of prepared GAC/Fe was tested by evaluating nitrate reduction; in addition, the effect of acid addition was investigated. A colorimetric assay was applied to quantify the reaction products, whereupon the effectiveness of the colorimetric assay was well verified. Ultimately, the prepared GAC/Fe composite demonstrated a synergistic effect between the adsorption capability of the GAC and the degradation capability of the nZVI, which make this composite a very effective material for environmental remediation.
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关键词
Nanoscale zero-valent iron,Granular activated carbon,Iron impregnation,Immobilization,Oxidation–reduction
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