| 零价铁活化过硫酸钠去除废水中的砷(Ⅴ) |
| 摘要点击 2825 全文点击 795 投稿时间：2017-01-13 修订日期：2017-06-02 |
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| 中文关键词 过硫酸钠(PS) 零价铁(ZVI) As(Ⅴ)溶液 水体砷污染 去除机制 |
| 英文关键词 sodium persulfate(PS) zero-valent iron (ZVI) As(Ⅴ) waste-water removal mechanism |
| 作者 | 单位 | E-mail | | 周孜迈 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | 13132559712@163.com | | 邓文娜 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | | | 杨艺琳 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | | | 孙艳秋 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | | | 王悦 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | | | 柳听义 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387 | liuty819@163.com | | 王中良 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学地理与环境科学学院, 天津 300387 | wangzhongliang@vip.skleg.cn |
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| 中文摘要 |
| 砷是目前人类发现毒性最强的物质之一，水体砷污染已成为一个亟待解决的全球性环境问题.利用零价铁（zero valent iron，ZVI）活化过硫酸钠（sodium persulfate，PS）产生的硫酸根自由基（SO4-·）对As（Ⅴ）溶液的去除能力远远大于PS或ZVI本身.通过控制PS和ZVI投加量、反应温度、初始pH值、As（Ⅴ）溶液初始浓度，研究各变量对As（Ⅴ）溶液的去除效果和动力学影响.通过X射线光电子能谱分析仪（XPS）和环境扫描电镜（SEM）对反应前后的物质结构进行表征分析.结果表明，当As（Ⅴ）溶液浓度为20~100 mg·L-1，As（Ⅴ）溶液的去除率都大于98%，并且反应符合准二级动力学. PS能加速ZVI的腐蚀，进而促进As（Ⅴ）溶液的吸附以及与铁的氧化物/氢氧化物的沉淀和共沉淀，从而达到去除As（Ⅴ）溶液的目的. |
| 英文摘要 |
| Arsenic is one of the most toxic substances yet discovered and arsenic contamination of water has become a global environmental problem in need of a solution. This study has identified the capacity of sodium persulfate (PS), activated by zero-valent iron (ZVI) to remove As(Ⅴ) from waste-water is much greater than the capacity of PS alone due to the production of sulfate radicals in the process. Five parameter types including PS and ZVI dosage, reaction temperature, initial pH value, and initial As(Ⅴ) concentration are discussed in detail. These parameters affect the removal rate dynamics as an influencing factor of the As(Ⅴ) concentration. The material structure before and after the reaction was characterized by X-ray photoelectron spectroscopy analysis (XPS) and scanning electron microscopy (SEM). It was demonstrated that under this solution of 20-100 mg·L-1 of As(Ⅴ), the removal rate of As(Ⅴ) is more than 98% and a pseudo-second order kinetic model can be used to describe the reaction. The removal mechanism of ZVI/PS to As(Ⅴ) was explored by comparing the results of X-ray photo-electron spectroscopy of samples taken before and after reaction with ZVI/PS. PS can accelerate the corrosion of ZVI and then promote the adsorption of As(Ⅴ), moreover, it can also form precipitates and coprecipitates with iron oxide/hydroxide to achieve an enhanced removal of As(Ⅴ). |
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