| nZVI/AC复合材料对水中锑的去除 |
| 摘要点击 2159 全文点击 805 投稿时间：2017-04-25 修订日期：2017-06-01 |
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| 中文关键词 印染废水 纳米铁 活性炭 锑 去除机制 |
| 英文关键词 dyeing wastewater nZVI activated carbon antimony removal mechanism |
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| 中文摘要 |
| 利用液相化学沉淀法制备纳米零价铁/活性炭（nZVI/AC）复合材料，通过XRD、XPS、SEM、BET等表征手段对复合材料的结构、形貌、理化特征等进行分析，进一步考察了反应体系、nZVI负载量、初始pH、投加量等对除锑效果的影响，并对其去除机制进行了探讨.结果表明，液相化学沉淀法可成功制备nZVI/AC复合材料；在N2氛围下，15% nZVI/AC投加量为0.2 g·L-1，初始pH为7.5（原水pH），反应2 h后，Sb（Ⅴ）的去除率达到76.2%，出水浓度仅为23.8μg·L-1；去除机制研究结果表明，Fe2+在该体系去除Sb（Ⅴ）中起着主要的作用，是反应过程中的主要活性物质，结合反应前后nZVI/AC表面Sb元素分析，去除过程主要依靠Fe（0）和Fe2+的还原作用，将Sb（Ⅴ）还原成Sb（Ⅲ），并通过吸附作用去除. |
| 英文摘要 |
| Nano zero-valent iron/activated carbon (nZVI/AC) composites were prepared via liquid phase chemical precipitation and then characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and Brunauer-Emmett-Teller theoretical methods for an analysis of the structure, morphology, physical and chemical characteristics of the composites. The effects of the reaction system, nZVI loading, initial pH, and dosage on antimony removal were investigated and the removal mechanisms were discussed. These results indicate that nZVI/AC can be successfully prepared via liquid phase chemical precipitation. In an N2 atmosphere, a dosage of 0.2 g·L-1, 15% nZVI/AC with an initial pH of 7.5 (the pH of raw water) was prepared. After a reaction duration of 2 h, the removal rate of Sb(Ⅴ) had reached 76.2% and the effluent concentration had decreased to only 23.8 μg·L-1. These results show that Fe2+ plays a major mechanistic role in the removal of Sb(Ⅴ) from the system and is the major active substance in the reaction process. In combination with an analysis of elemental Sb on the surface of the nZVI/AC before and after reaction, the removal process relies on the reduction of Fe(0) and Fe2+, Sb(Ⅴ) reducted into Sb(Ⅲ) and through adsorption removal. |
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