We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Efficient Cd(II) Removal from Aqueous Solution Using Mechanically Activated CaCO<sub>3</sub>: Removal Pathway and Mechanism.
- Authors
Wang, Zhenlei; Zhao, Yunliang; Wen, Tong; Zhang, Tingting; Bai, Haoyu; Song, Shaoxian; Zhang, Qiwu
- Abstract
Cd(II) pollution in water will cause serious threats to the environment and human health. The general remediation protocol for Cd(II) pollution by hydroxide (Ca(OH)2 or NaOH) is still faced with filtering difficulties and high effluent pH. To develop an applicable method for the Cd(II) removal in water, we prepared an activated calcium carbonate (CaCO3) material by changing the crystallinity, particle size, and surface activity of CaCO3, and investigated the corresponding Cd(II) removal capacity from aqueous solutions. The results showed that more than 99.9% of Cd(II) was removed within 10 min in an initial concentration of 50 mg L−1. Moreover, the effluent pH is close to neutral after removal of Cd(II), and the sediment is filtered well. Comparative experiments and characterizations have demonstrated that the excellent Cd(II) removal performance of activated CaCO3 is due to the mechanical activation changes the surface activity of the original stable CaCO3, promotes the slow-release dissolution equilibrium of the active carbonate groups, and thus the coprecipitation of cadmium hydroxide and cadmium carbonate on CaCO3 particles. This research demonstrates that mechanical activation of CaCO3 could be used as a repair material for efficient removal of heavy metal pollution in water, which can solve the problems of filtration and high effluent pH of alkaline precipitation.
- Publication
Water, Air & Soil Pollution, 2022, Vol 233, Issue 9, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-022-05858-5