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采用氢气还原天然针铁矿法制备出粒径为14 nm的单质铁纳米材料,考察了该纳米铁对水中硝酸盐的去除特性及影响因素,并与普通铁粉进行了对比。结果表明,与普通铁粉相比,纳米铁粉对硝酸盐的去除效果受pH值的影响较小;在纳米铁粉与硝酸盐的质量比为40∶1、反应时间为5 h、硝酸盐初始浓度为60 mg/L的条件下,纳米铁对硝酸盐具有较高的还原活性,对硝酸盐的去除率可达90%以上,且还原产物中基本无亚硝酸盐;溶解氧和天然针铁矿粒径对纳米铁去除硝酸盐的影响不大。采用氢气还原天然针铁矿制备纳米铁的方法简单且成本较低,在去除地下水中的硝酸盐方面具有很好的应用前景。
Hydrogen reduction of natural goethite was used to prepare single-particle iron nanomaterials with particle size of 14 nm. The removal characteristics and influencing factors of nitrate in water were investigated and compared with that of common iron powder. The results showed that compared with ordinary iron powder, the effect of nano-iron powder on nitrate removal was less affected by pH value. When the mass ratio of nano-iron powder to nitrate was 40:1, reaction time was 5 h, nitrate The initial concentration of 60 mg / L of the conditions, the nano-iron nitrate nitrate has a high reduction activity, the nitrate removal rate of up to 90%, and the reduction of the product was essentially no nitrite; dissolved oxygen and natural needles Iron ore particle size of nano-iron removal of nitrate little effect. The method of hydrogen reduction of natural goethite to prepare nano iron is simple and low cost and has good application prospect in removing nitrate in groundwater.