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
中图分类号:
苗艳晖, 王振磊, 张婷婷, 赵云良, 温通. 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[J]. 工业水处理, 2024, 44(5): 80-87.
Yanhui MIAO, Zhenlei WANG, Tingting ZHANG, Yunliang ZHAO, Tong WEN. Efficient removal of Cd/As combined pollution in water by mechanically activated calcite with FeSO4[J]. Industrial Water Treatment, 2024, 44(5): 80-87.