| 负载型纳米铁吸附剂去除饮用水中As(Ⅲ)的研究 |
| 摘要点击 1425 全文点击 3035 投稿时间：2008-07-02 修订日期：2008-09-26 |
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| 中文关键词 纳米铁 负载型吸附剂 As(Ⅲ) 吸附 饮用水 |
| 英文关键词 nano zero-valent iron supported adsorbent As(Ⅲ) adsorption drinking water |
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| 中文摘要 |
| 以活性炭为载体,利用液相还原方法制备了一种负载型纳米铁吸附剂,载入量(Fe/炭)为82.0 mg/g.纳米铁在活性炭孔内呈针状,其直径为30～500 nm,长度为1?000～3?000 nm.该吸附剂在pH 6.5,(25±2)℃,As(Ⅲ)初始浓度为2 mg/Ｌ,吸附剂用量为1.0 g/Ｌ时,As(Ⅲ)的去除率为99.86%,吸附剂的砷吸附容量为1.997 mg/g;吸附速率在前12 h较快,可达94.3%,72 h达到吸附平衡.吸附过程中As(Ⅲ)部分被吸附剂氧化.PO３－4、SiO２－３对As(Ⅲ)的去除抑制较大,而SO２－4、CO２－３、C2Ｏ２－4等离子对砷的去除影响较小.吸附平衡后的吸附剂可以用0.1 mol/Ｌ NaOH溶液洗脱再生,再生效率较高.室内实验数据表明,该吸附剂在饮用水除砷领域具有较好的应用前景. |
| 英文摘要 |
| Nano zero-valent iron was loaded onto activated carbon by deoxidizing Fe２＋ in aqueous solution and approximately 8.2%(wt) of iron was loaded it. The size of the needle-shaped iron particles in the pores of carbon was (30-500）×(1?000-3?000) nm. The adsorption capacity for arsenic was approximately 1.997 mg/g activated carbon supported nano zero-valent iron (NZVI/AC) in the 2 mg/Ｌ As(Ⅲ) solution at pH 6.5 and (25±2) ℃. The uptake of arsenic by NZVI/AC was rapid in the first 12 h (94.3%) and equilibrium was achieved at 72 h (99.86%). As(Ⅲ) was partly oxidized by the absorbent in the process of absorption. The presence of phosphate and silicate ions significantly decreased arsenic removal rate while the effect of other common ions such as sulfate, carbonate and oxalate was insignificant. NZVI/AC was effectively regenerated after adsorption of arsenic when elution was applied with 0.1 mol/Ｌ NaOH solution. The results suggest that NZVI/AC is an ideal candidate for the treatment of arsenic contaminated drinking water. |
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