期刊
NANOMATERIALS
卷 11, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/nano11081912
关键词
fixed-bed column; antimonite (Sb(III)); weak magnetic field (WMF); adsorption; removal
类别
资金
- National Nature Science Foundation of China [51709141/400773076]
The study investigated the effectiveness of nanoscale zero-valent iron immobilized on activated carbon in removing antimonite from contaminated water. Results showed that a weak magnetic field can enhance the exclusion of paramagnetic Sb(III) ions by nZVI/AC. However, this also led to faster corrosion and dissolution of the iron.
The effectiveness of nanoscale zero-valent iron(nZVI) immobilized on activated carbon (nZVI/AC) in removing antimonite (Sb(III)) from simulated contaminated water was investigated with and without a magnetic fix-bed column reactor. The experiments were all conducted in fixed-bed columns. A weak magnetic field (WMF) was proposed to increase the exclusion of paramagnetic Sb(III) ions by nZVI/AC. The Sb(III) adsorption to the nZVI and AC surfaces, as well as the transformation of Sb(III) to Sb(V) by them, were both increased by using a WMF in nZVI/AC. The increased sequestration of Sb(III) by nZVI/AC in the presence of WMF was followed by faster nZVI corrosion and dissolution. Experiments were conducted as a function of the pH of the feed solution (pH 5.0-9.0), liquid flow rate (5-15 mL center dot min(-1)), starting Sb(III) concentration (0.5-1.5 mg center dot L-1), bed height nZVI/AC (10-40 cm), and starting Sb(III) concentration (0.5-1.5 mg center dot L-1). By analyzing the breakthrough curves generated by different flow rates, different pH values, different inlet Sb(III) concentrations, and different bed heights, the adsorbed amounts, equilibrium nZVI uptakes, and total Sb(III) removal percentage were calculated in relation to effluent volumes. At pH 5.0, the longest nZVI breakthrough time and maximal Sb(III) adsorption were achieved. The findings revealed that the column performed effectively at the lowest flow rate. With increasing bed height, column bed capacity and exhaustion time increased as well. Increasing the Sb(III) initial concentration from 0.5 to 1.5 mg center dot L-1 resulted in the rise of adsorption bed capacity from 3.45 to 6.33 mg center dot g(-1).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据