工业水处理 ›› 2024, Vol. 44 ›› Issue (5): 80-87. doi: 10.19965/j.cnki.iwt.2023-0373

• 试验研究 • 上一篇    下一篇

机械力活化方解石复合硫酸亚铁去除水中镉/砷复合污染研究

苗艳晖1(), 王振磊1, 张婷婷2(), 赵云良1,3, 温通1   

  1. 1. 武汉理工大学资源与环境工程学院,湖北 武汉 430070
    2. 武汉轻工大学化学与 环境工程学院,湖北 武汉 430023
    3. 武汉科莱烯科技有限公司,湖北 武汉 430223
  • 收稿日期:2024-04-09 出版日期:2024-05-20 发布日期:2024-05-21
  • 作者简介:

    苗艳晖(2000— ),硕士研究生。E-mail:

    张婷婷,副教授,研究生导师。E-mail:

  • 基金资助:
    国家自然科学基金青年科学基金项目(52204283); 湖北省自然科学基金面上项目(2021CFB554); 湖北省教育厅科学研究重点项目(D20221605)

Efficient removal of Cd/As combined pollution in water by mechanically activated calcite with FeSO4

Yanhui MIAO1(), Zhenlei WANG1, Tingting ZHANG2(), Yunliang ZHAO1,3, Tong WEN1   

  1. 1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
    2. School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
    3. Wuhan Clayene Technology Co. , Ltd. , Wuhan 430223, China
  • Received:2024-04-09 Online:2024-05-20 Published:2024-05-21

摘要:

水体中的镉、砷等重金属污染严重威胁人类的健康安全,其中镉/砷复合污染去除难度更大。通过水中镉/砷复合污染去除试验,探究机械力活化方解石复合硫酸亚铁去除镉/砷复合污染的性能,发现机械力活化方解石可显著提升水中镉/砷复合污染的去除效果。试验结果表明,活化方解石复合硫酸亚铁在30 min内对溶液中镉、砷离子的去除率可达到99%以上。采用SEM-EDS、XRD、XPS等方法对活化方解石复合硫酸亚铁高效去除水中镉/砷复合污染机理进行研究,结果表明,方解石在机械力活化的作用下改变了自身的结晶度和溶解活性,其在水体中溶解水解产生CO3 2-与OH-的性能明显提升,OH-促进硫酸亚铁在溶液中与砷形成稳定的铁氧结合态沉淀,CO3 2-与溶液中的镉结合形成稳定的碳酸镉沉淀。

关键词: 水体修复, 镉/砷复合污染, 混凝沉淀, 机械力活化, 方解石

Abstract:

Heavy metal pollution such as cadmium and arsenic in water seriously threatens human health and safety, and the removal of Cd/As combined pollution is more difficult. In this work, the performance of mechanically activated calcite composite FeSO4 to remove Cd/As combined pollution was investigated by Cd/As combined pollution removal test in water. It was found that mechanically activated calcite can significantly improve the removal efficiency of Cd/As combined pollution in water. The results showed that the removal rate of Cd and As can reach 99% in 30 min by activated calcite composite FeSO4. The removal mechanism of Cd/As combined pollution in water by activated calcite and FeSO4 was studied by SEM-EDS, XPS, and XRD. The results showed that the crystallinity and dissolution activity of calcite were changed by mechanical activation, and the hydrolysis of calcite to produce CO3 2- and OH- wasenhanced. OH- promoted the formation of a stable iron oxide bound precipitate of FeSO4 with arsenic, and CO3 2- binded with cadmium to form a stable precipitate of cadmium carbonate.

Key words: water restoration, Cd/As combined pollution, coagulating sedimentation, mechanical activation, calcite

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