| 负载型纳米铁吸附剂去除饮用水中As(Ⅴ)的研究 |
| 摘要点击 4219 全文点击 3093 投稿时间：2009-01-07 修订日期：2009-03-16 |
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| 中文关键词 负载型纳米铁 As(Ⅴ) 吸附 饮用水 |
| 英文关键词 supported nano zero-valent iron on activated carbon(NZVI/AC) As(Ⅴ) adsorption drinking water |
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| 中文摘要 |
| 以活性炭为载体制备了一种负载型纳米铁吸附剂.纳米铁在活性炭孔内为针状，其直径为30～500 nm，长度为1 000～3 000 nm，载入量［m(Fe)/m(炭)］为82.1 mg/g.用1.5 g/L该吸附剂对pH 6.5、 (25±2)℃、 2 mg/L的As(Ⅴ)进行吸附其去除率为99.5%，在平衡浓度1.0 mg/L时，该吸附剂对As(Ⅴ)的吸附容量为15.4 mg/g；吸附速度较快，12 h可达91.4%，72 h达到吸附平衡.吸附过程可由孔内扩散模型较好地说明.除PO43-、SiO42-外其它常见阴阳离子均对As(Ⅴ)的去除影响不大.吸附剂可以用0.1 mol/L NaOH溶液再生，再生效率较高.实验室初步实验数据表明，该吸附剂对饮用水砷去除具有较好的应用前景. |
| 英文摘要 |
| A new adsorbent，activated carbon impregnated with nano zero-valent iron was prepared，which size of the needle-shaped iron particles in the pores of carbon was (30-500)nm×(1 000-3 000) nm and approximately 8.2% of iron was loaded onto it. The arsenate removal percentage was 99.5% by 1.5 g/L NZVI/AC in the 2 mg/L arsenic solution at pH 6.5 and (25±2)℃. The adsorption capacity was about 15.4 mg/g when equilibrium concentration was 1.0 mg/L. Kinetics revealed that uptake of arsenate ion by NZVI/AC was 91.4% in the first 12 h and equilibrium time was about 72 h. The intraparticle diffusion model was applied to study the mechanics of arsenate in the activated carbon. The presence of phosphate and silicate could significantly decrease arsenate removal while the effects of the other anions and cations on the arsenic removal were neglectable. NZVI/AC can be effectively regenerated when elution is done with 0.1 mol/L NaOH solution. Our results suggest that NZVI/AC is a suitable candidate for drinking water treatment due to its high reactivity. |
