| 负载纳米零价铁铜藻基活性炭的制备及其去除水中Cr(Ⅵ)的研究 |
| 摘要点击 2764 全文点击 1882 投稿时间：2014-07-23 修订日期：2014-09-23 |
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| 中文关键词 铜藻 活性炭 纳米零价铁 Cr(Ⅵ) 吸附 还原 |
| 英文关键词 Sargassum horneri active carbon nano zero-valent iron hexa-valent chromium adsorption reduction |
| 作者 | 单位 | E-mail | | 曾淦宁 | 浙江工业大学海洋学院, 杭州 310014 | gnzeng@zjut.edu.cn | | 武晓 | 浙江工业大学化学工程学院, 杭州 310014
浙江省生物燃料利用技术研究重点实验室, 杭州 310014 | | | 郑林 | 浙江工业大学化学工程学院, 杭州 310014 | | | 伍希 | 浙江工业大学化学工程学院, 杭州 310014
浙江省生物燃料利用技术研究重点实验室, 杭州 310014 | | | 屠美玲 | 浙江工业大学化学工程学院, 杭州 310014 | | | 王铁杆 | 浙江省海洋水产养殖研究所, 温州 325005 | | | 艾宁 | 浙江工业大学化学工程学院, 杭州 310014
浙江省生物燃料利用技术研究重点实验室, 杭州 310014 | aining@zjut.edu.cn |
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| 中文摘要 |
| 以铜藻为原料,采用氯化锌活化法、初湿含浸法制备了负载纳米零价铁铜藻基活性炭(NZVI/SAC),并采用 X射线衍射、扫描电镜和 X射线光电子能谱等方法对材料进行了分析. 结果表明,纳米零价铁颗粒以 50~150 nm粒径的球形形态负载在铜藻基活性炭上,且 NZVI/SAC表面具有一层以铁的氧化物形态存在的核壳结构. 对水中 Cr(Ⅵ)的去除实验表明, NZVI/SAC是一种适用于高浓度 Cr(Ⅵ)废水的处理材料; NZVI/SAC去除水中 Cr(Ⅵ)的机制是还原反应与吸附共同作用, pH< 4时 NZVI/SAC对 Cr(Ⅵ)的去除以还原作用为主, pH> 4时材料对 Cr(Ⅵ)的去除主要以 NZVI和 SAC的吸附作用决定; 当载铁量为 30%、pH=2、温度为 30℃时, 2 g·L-1的 NZVI/SAC能将 100 mg·L-1 Cr(Ⅵ)在 10 min内快速降解,此时以还原反应为主,最终去除率达 100%. |
| 英文摘要 |
| Nanoscale zero-valent iron supported on Sargassum horneri activated carbon (NZVI/SAC) was synthesized by zinc chloride activation and incipient wetness method, and characterized with X-ray diffraction (XRD), Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). XRD confirmed the existence of nano zero-valent iron, and SEM revealed that the material consisted of mainly 30-150 nm spherical particles aggregated into chains of individual units. The valence state of iron conformed with the nuclear-shell model. The effects of NZVI loading on AC, pH and the initial concentration of Cr(Ⅵ) on the removal of Cr(Ⅵ) were investigated. The final Cr(Ⅵ) removal percentage was up to 100% under the following conditions: 30℃, pH=2, NZVI/SAC dosage of 2 g·L-1 and the amounts of NZVI loaded on SAC of 30%. And the equilibrium time was 10 minutes. These results showed that NZVI/SAC could be potentially applied for removal of high concentration Cr(Ⅵ). By analyzing the chemical change of NZVI/SAC, we demonstrated that Cr(Ⅵ) was mainly reduced to insoluble Cr (Ⅲ) compound in the reaction when pH was less than 4, and adsorbed by NZVI and SAC when pH was over 4. |
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