| 改性凹凸棒负载硫化亚铁的制备及其对水中Mo (Ⅵ)的吸附机制 |
| 摘要点击 1476 全文点击 1617 投稿时间：2022-01-19 修订日期：2022-03-31 |
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| 中文关键词 重金属钼 吸附 凹凸棒 硫化亚铁 改性 |
| 英文关键词 Mo(Ⅵ) adsorption attapulgite iron sulfide modification |
| 作者 | 单位 | E-mail | | 练建军 | 安徽工业大学冶金减排与资源综合利用教育部重点实验室, 马鞍山 243002
安徽工业大学能源与环境学院, 马鞍山 243002 | jjlian85@126.com | | 邬洪艳 | 安徽工业大学能源与环境学院, 马鞍山 243002 | | | 叶天然 | 安徽工业大学能源与环境学院, 马鞍山 243002 | | | 孔巧平 | 青岛理工大学环境与市政工程学院, 青岛 266033 | | | 徐晴 | 安徽工业大学能源与环境学院, 马鞍山 243002 | | | 吴朝阳 | 安徽工业大学冶金减排与资源综合利用教育部重点实验室, 马鞍山 243002 | | | 陈波 | 安徽工业大学冶金减排与资源综合利用教育部重点实验室, 马鞍山 243002
安徽工业大学能源与环境学院, 马鞍山 243002 | greenchenbo@163.com | | 牛司平 | 安徽工业大学能源与环境学院, 马鞍山 243002 | |
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| 中文摘要 |
| 以凹凸棒为载体，制备出一种热加酸改性凹凸棒负载硫化亚铁复合材料（MATP-FeS），并对其除Mo （Ⅵ）性能进行了分析.结果表明在pH=4.0和7.0的反应条件下，铁土质量比为1 ∶2合成的MATP-FeS对Mo （Ⅵ）的去除率分别为76.96%和54.60%，而未改性FeS对Mo （Ⅵ）的去除率分别为23.79%和13.28%.MATP-FeS对Mo （Ⅵ）的吸附过程符合准二级动力学模型.Langmuir模型和Temkin模型能较好地描述吸附等温过程，且由Langmuir模型计算得到在318 K下MATP-FeS对Mo （Ⅵ）的饱和吸附容量为16.86 mg·g-1.Mo （Ⅵ）去除率在pH为2.0~3.0时达到最大值（95.25%）；氮气、空气和纯氧条件下MATP-FeS对Mo （Ⅵ）的去除率分别为77.58%、83.97%和83.96%；MATP-FeS在老化60 d后对水中10 mg·L-1的Mo （Ⅵ）仍有70.53%的去除率，远高于未改性的FeS （14.97%）.X射线光电子能谱（XPS）分析结果表明，反应后MATP-FeS表面Mo均以正六价形态存在，结合反应过程模型得出，Mo （Ⅵ）去除机制主要是表面吸附作用. |
| 英文摘要 |
| A thermally and acid-modified attapulgite-supported iron sulfide composite (MATP-FeS) was prepared using attapulgite as a carrier and then analyzed for enhancing the performance of molybdenum(VI) removal. The results showed that the MATP-FeS at a FeS:attapulgite mass ratio of 1:2 displayed an enhanced molybdenum(Ⅵ) removal efficiency of 76.96% and 54.60% at a pH of 4.0 and 7.0 compared to 23.79% and 13.28% for unmodified FeS, respectively. The adsorption of molybdenum(Ⅵ) onto MATP-FeS followed pseudo-second-order kinetics. The Langmuir and Temkin models could better describe the adsorption isotherm process. Moreover, the maximum adsorption capacity of MATP-FeS for Mo(Ⅵ) calculated by the Langmuir model was 16.86 mg·g-1 at 318 K. The maximum removal efficiency of Mo(Ⅵ) reached 95.25% at pH 2.0-3.0. The removal rates of Mo(Ⅵ) by MATP-FeS under nitrogen, air, and pure oxygen conditions were 77.58%, 83.97%, and 83.96%, respectively. MATP-FeS after 60 days of aging showed a 70.53% removal rate towards 10 mg·L-1 Mo(Ⅵ) in aqueous solution, which was much higher than that of unmodified FeS (14.97%). X-ray photoelectron spectroscopy (XPS) analysis results showed that Mo existed in the positive hexavalent form on the surface of the reacted MATP-FeS. Combined with the reaction process model, it could be concluded that surface adsorption was the main Mo(Ⅵ) removal mechanism. |
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