Institute of Municipal Engineering, Zhejiang University, Hangzhou, China.
Water Sci Technol. 2013;68(3):658-64. doi: 10.2166/wst.2013.290.
A novel kind of iron oxide supported on carbon nanotubes (CNTs) was prepared for adsorption of antimony (Sb)(III) in aqueous solution. The iron (III) oxide (Fe2O3)-modified CNTs were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption and Fourier transform infrared spectrometer. Parameters affecting the adsorption efficiencies, including solution pH value, initial Sb(III) concentration, adsorbent dosage, adsorption time and temperature, were investigated. The results indicate that the removal rate of Sb(III) by Fe2O3-modified CNTs is 99.97% under the initial Sb(III) concentration of 1.5 mg/L, adsorbents dosage of 0.5 g/L, temperature of 25 (o)C and pH value of 7.00, which is 29.81% higher than that of the raw CNTs. The adsorption capacity increased correspondingly from 3.01 to 6.23 mg/g. The equilibrium adsorption data can be fitted to the Freundlich adsorption isotherm. In addition, it has been found that the solution pH values and adsorption temperatures have no significant influence on Sb(III) removal.
一种新型的氧化铁负载在碳纳米管（CNTs）上被制备用于吸附水溶液中的锑（Sb）（III）。用 X 射线衍射、扫描电子显微镜、透射电子显微镜、氮气吸附-解吸和傅里叶变换红外光谱对铁（III）氧化物（Fe2O3）-改性 CNTs 进行了表征。考察了溶液 pH 值、初始 Sb（III）浓度、吸附剂用量、吸附时间和温度等参数对吸附效率的影响。结果表明，在初始 Sb（III）浓度为 1.5mg/L、吸附剂用量为 0.5g/L、温度为 25°C 和 pH 值为 7.00 的条件下，Fe2O3-改性 CNTs 对 Sb（III）的去除率为 99.97%，比原始 CNTs 高 29.81%。吸附容量相应地从 3.01mg/g 增加到 6.23mg/g。平衡吸附数据可以拟合 Freundlich 吸附等温线。此外，还发现溶液 pH 值和吸附温度对 Sb（III）的去除没有显著影响。
