气溶胶法炭负载纳米零价铁吸附与化学还原性能研究

纳米零价铁(nZVI)作为一种新型环境友好材料，因其本身不稳定、易团聚等性质而在环境污染治理等领域的应用受到限制。本研究采用气溶胶法以炭作为载体，通过支撑与负载作用制备了炭负载纳米零价铁(Fe⁰/C)复合材料，并对其进行了系列表征，研究了其对有机物吸附和对硝酸盐的还原效果。结果表明：在Fe⁰/C中，Fe⁰呈纳米颗粒状均匀镶嵌在球状炭球内外表面，直径范围为80～120 nm;相比nZVI,Fe⁰/C具有较高的比表面积；Fe⁰/C对罗丹明B的最大吸附量为853.7 mg/g,对硝酸盐的2 h去除率为50.6%,产物中54.7%为N₂,表明复合材料具有良好还原性能与实际应用价值。

ADSORPTION AND CHEMICAL REDUCTION PERFORMANCE OF CARBON-SUPPORTED NANO-ZERO VALENT IRON PREPARED BY AEROSOL METHOD

Nano zero-valent iron (nZVI), as a new type of environmentally friendly material, is limited in the field of environmental pollution control due to its inherent instability and easy agglomeration. In this study, nano-zero-valent iron/carbon(Fe⁰/C) composites were prepared by using aerosol carbon as a carrier, and their effects on organic matter adsorption and nitrate reduction were studied. SEM results show that Fe⁰ is uniformly embedded in the inner and outer surfaces of spherical carbon in the form of nanoparticles, with a diameter ranging from 80 to 120 nm. Combined with BET and other characterization results, it is shown that Fe⁰/C composite has a high specific surface area. The results of adsorption and chemical reduction experiments showed that the maximum adsorption capacity of Rhodamine B was 853.7 mg/g, the removal rate of nitrate for 2 h was 50.6%, and 54.7% of the product was nitrogen, which proved the good reduction performance and practical application value of the composite material.