Zhu Hui-Jie, Jia Yong-Feng, Wu Xing, Wang He
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Huan Jing Ke Xue. 2009 Jun 15;30(6):1644-8.
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) x (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) degrees C. 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.
通过在水溶液中还原Fe2+将纳米零价铁负载到活性炭上，铁的负载量约为8.2%（重量）。碳孔隙中针状铁颗粒的尺寸为(30 - 500)×(1000 - 3000)nm。在pH值为6.5、温度为(25±2)℃的2mg/L As(III)溶液中，负载纳米零价铁的活性炭（NZVI/AC）对砷的吸附容量约为1.997mg/g。NZVI/AC对砷的吸附在前12小时迅速（94.3%），72小时达到平衡（99.86%）。As(III)在吸附过程中被吸附剂部分氧化。磷酸根和硅酸根离子的存在显著降低了砷的去除率，而硫酸根、碳酸根和草酸根等其他常见离子的影响不显著。用0.1mol/L NaOH溶液洗脱后，NZVI/AC在吸附砷后能有效再生。结果表明，NZVI/AC是处理受砷污染饮用水的理想材料。
