| 天然黄铁矿吸附去除水中Sb(Ⅴ):性能与机制 |
| 摘要点击 1325 全文点击 518 投稿时间：2020-01-12 修订日期：2020-03-20 |
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| 中文关键词 黄铁矿 Sb(Ⅴ) 含氧阴离子 动力学 配位交换 |
| 英文关键词 pyrite Sb(Ⅴ) oxygen anion kinetics coordination exchange |
| 作者 | 单位 | E-mail | | 石松 | 东华大学环境科学与工程学院, 国家环境保护纺织污染防治工程技术中心, 上海 201620 | hjshisong@163.com | | 吴乾元 | 清华大学深圳国际研究生院资源与环境学院, 广东省城市水循环与环境安全工程研究中心, 深圳市微生物应用与风险控制重点实验室, 深圳 518055 | | | 李新正 | 清华大学深圳国际研究生院资源与环境学院, 广东省城市水循环与环境安全工程研究中心, 深圳市微生物应用与风险控制重点实验室, 深圳 518055 | | | 黄满红 | 东华大学环境科学与工程学院, 国家环境保护纺织污染防治工程技术中心, 上海 201620 | huangmanhong@dhu.edu.cn |
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| 中文摘要 |
| 比较了3种铁矿石（黄铁矿、赤铁矿和磁铁矿）对于五价锑[Sb（Ⅴ）]的吸附效果，选用效果最好的黄铁矿作为Sb（Ⅴ）的吸附剂，考察了黄铁矿粒径、投加量和pH对吸附效果的影响.结果表明，当Sb（Ⅴ）初始浓度在90~100 μg ·L-1时，黄铁矿粒径200M（过200目筛，<0.074 mm）、投加量1 g ·L-1和pH=7时吸附效果最好，对Sb（Ⅴ）的去除率在80%以上；离子竞争实验结果表明，PO43-对吸附Sb（Ⅴ）有抑制作用，而SO42-和CO32-对吸附Sb（Ⅴ）无明显不利影响，这可能是因为PO43-会与Sb（Ⅴ）竞争黄铁矿表面的活性配位吸附点；准二级动力学模型和Langmuir模型能更好地模拟吸附过程，表明吸附过程是单层吸附行为，主要作用是化学吸附；红外分析表明黄铁矿对Sb（Ⅴ）的去除过程是配位离子交换反应；EDS与XPS数据证实锑被吸附到黄铁矿表面，并且没有被还原成毒性更高的三价锑[Sb（Ⅲ）]. |
| 英文摘要 |
| The adsorption performance of three iron ores (pyrite, hematite, and magnetite) on Sb(Ⅴ) was compared and pyrite was shown to exhibit the highest adsorption performance. The effects of particle size, concentration, and pH on the adsorption performance were investigated with pyrite as the absorbent. The rejection of Sb(Ⅴ) was the highest (>80%) when pyrite (particle size <0.074 mm) was used as the absorbent with a concentration of 1 g ·L-1 and pH=7. The ion competition experiment indicated that PO43- can inhibit the adsorption of Sb(Ⅴ), while SO42- and CO32- have no significant effects on the adsorption of Sb(Ⅴ) because PO43- can compete with Sb(Ⅴ) for active adsorption sites on the surface of pyrite. The results also showed that the quasi-second-order kinetic model and Langmuir model can better simulate the adsorption process, which shows a single-layer adsorption behavior and chemisorption plays a main role in the rejection of Sb(Ⅴ). FTIR analysis suggested that the removal of Sb(Ⅴ) by pyrite was a coordinated ion exchange reaction. EDS and XPS results further confirmed that Sb(Ⅴ) was adsorbed on the surface of pyrite and was not reduced to Sb(Ⅲ), which is more toxic. |
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