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Mechanochemical activation of serpentine for recovering Cu (II) from wastewater
AbstractIn this paper, a novel method for copper removal was introduced, in which serpentine, a hydrated magnesium silicate, was activated by mechanical force to raise its reactivity as high as Mg hydroxide to remove Cu (II) from wastewater. Copper precipitation occurred easily when agitating the activated serpentine in copper sulfate solution. Characterizations of the activated samples and the samples after treatment of Cu (II) were also performed by X-ray diffraction (XRD), Thermogravimetry & Differential Scanning Calorimetry (TG-DSC). Chemical precipitation with wroewolfeite (CuSO4·3Cu(OH)2·2H2O), a basic copper sulfate, rather than the well known general adsorption by the raw mineral without activation, was formed and gave a very high capacity up to 538.8mg/g for copper removal, comparable with the precipitation by alkaline neutralization of Mg/Ca hydroxide. One more important advantage of using the activated serpentine allowed a selective copper removal from the solution with other metals as Ni (II), Mn (II), Zn (II) and Cd (II) remaining in the solution. The copper precipitate without coexistence of other metals may serve as a good source for copper recycling. The process based on using activated serpentine exhibits the merits for both environmental purification and copper recovery from secondary source/waste, providing a usable method for waste serpentine source as well.
Graphical abstractThe serpentine is a kind of layered silicate minerals, when the raw material of serpentine activated by the grinding operation, it would change to be amorphous gradually. After the treatment of copper(II) solution by the activated serpentine, the formation of wroewolfeite phase as the copper precipitate confirms that a chemical precipitation has occurred during the copper removal from the solution, explaining the higher capacity of the activated serpentine than the raw material.
HighlightsSerpentine activated by mechanical forceActivated serpentine for removing Cu (II) from wastewaterSelective Cu (II) precipitation from other heavy metalsEasy Cu (II) recovery from the precipitate by weak acid leaching
Mechanochemical activation of serpentine for recovering Cu (II) from wastewater
AbstractIn this paper, a novel method for copper removal was introduced, in which serpentine, a hydrated magnesium silicate, was activated by mechanical force to raise its reactivity as high as Mg hydroxide to remove Cu (II) from wastewater. Copper precipitation occurred easily when agitating the activated serpentine in copper sulfate solution. Characterizations of the activated samples and the samples after treatment of Cu (II) were also performed by X-ray diffraction (XRD), Thermogravimetry & Differential Scanning Calorimetry (TG-DSC). Chemical precipitation with wroewolfeite (CuSO4·3Cu(OH)2·2H2O), a basic copper sulfate, rather than the well known general adsorption by the raw mineral without activation, was formed and gave a very high capacity up to 538.8mg/g for copper removal, comparable with the precipitation by alkaline neutralization of Mg/Ca hydroxide. One more important advantage of using the activated serpentine allowed a selective copper removal from the solution with other metals as Ni (II), Mn (II), Zn (II) and Cd (II) remaining in the solution. The copper precipitate without coexistence of other metals may serve as a good source for copper recycling. The process based on using activated serpentine exhibits the merits for both environmental purification and copper recovery from secondary source/waste, providing a usable method for waste serpentine source as well.
Graphical abstractThe serpentine is a kind of layered silicate minerals, when the raw material of serpentine activated by the grinding operation, it would change to be amorphous gradually. After the treatment of copper(II) solution by the activated serpentine, the formation of wroewolfeite phase as the copper precipitate confirms that a chemical precipitation has occurred during the copper removal from the solution, explaining the higher capacity of the activated serpentine than the raw material.
HighlightsSerpentine activated by mechanical forceActivated serpentine for removing Cu (II) from wastewaterSelective Cu (II) precipitation from other heavy metalsEasy Cu (II) recovery from the precipitate by weak acid leaching
Mechanochemical activation of serpentine for recovering Cu (II) from wastewater
Huang, Pengwu (author) / Li, Zhao (author) / Chen, Min (author) / Hu, Huimin (author) / Lei, Zhiwu (author) / Zhang, Qiwu (author) / Yuan, Wenyi (author)
Applied Clay Science ; 149 ; 1-7
2017-08-28
7 pages
Article (Journal)
Electronic Resource
English
The Mechanochemical Activation of Belite
| British Library Conference Proceedings | 1993
Online Contents | 2006