Fe_3O_4/纳米级Fe^0去除水中Cr(Ⅵ)的研究

Study on the Removal of Cr(Ⅵ) by Fe_3O_4/nanoscale Zero-valent Iron(Fe^0) in Wastewater

考察了Fe3O4/纳米级Fe0对污染水中Cr(Ⅵ)的去除效果,以及Fe3O4投加量、腐殖酸投加量、温度对Fe3O4/纳米级Fe0去除水中Cr(Ⅵ)的影响。结果表明:Fe3O4/纳米级Fe0对水中Cr(Ⅵ)的去除效果很好,在2 min时Cr(Ⅵ)的去除率就能够达到91.4%;这个值比纳米级Fe0单独作用120 min时对Cr(Ⅵ)的去除率还要高。Fe3O4与纳米级Fe0的配比为7.5:1时,Fe3O4/纳米级Fe0对Cr(Ⅵ)的去除效果最好。温度的升高加速了Fe3O4/纳米级Fe0对水中Cr(Ⅵ)还原降解反应的进行。

The removal of Cr（VI） by Fe3O4/nanoscale Fe0 and the effect of Fe304 dosage, HA dosage and temperature on it were evaluated. The experiment results indicated that 91.4% Cr（VI） could be removed by Fe3 O4/nanoscale Fe0 within 2 min compared with 5.1% by bare Fe3O4 and 79.0% by bare nanoscale Fe0. And the optimal ratio of F3O4 to nanoscale Fe0 mass lies at 7.5.1. High temperature could increase the Cr（VI） remov- al efficiency.