Eco − utilization of silicon − rich lye: Synthesis of amorphous calcium silicate hydrate and its application for recovering heavy metals
•Nano-crystalline C − S − H is synthesized from SRL by mild causticization and crystallization strategy.•High-efficiency separation of Na/Si components and alkali recycling can be collaboratively achieved from SRL.•C-S-H presents amorphous honeycomb porous structure and activity ions exchange sites....
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| Published in | Separation and purification technology Vol. 282; p. 120092 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.02.2022
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| Abstract | •Nano-crystalline C − S − H is synthesized from SRL by mild causticization and crystallization strategy.•High-efficiency separation of Na/Si components and alkali recycling can be collaboratively achieved from SRL.•C-S-H presents amorphous honeycomb porous structure and activity ions exchange sites.•Amorphous C − S − H exhibits quickly recovery performances to heavy metals Cu (II), Zn (II), and Cr (III).•Heavy metal recovery mechanisms are cations exchange and interlayer bonding proved by DFT simulation.
During sustainable high-value utilization of coal-based solid wastes, a kind of characteristic silicon-rich lye (SRL) generated, and its comprehensive recovery and recycling remains an important subject. Through a simple and facile strategy of mild caustic-crystallization method, SRL was favorably utilized through calcium silicate hydrate (C − S − H) synthesis with silicon conversion efficiency over 97.33%. The micro-morphology of C − S − H presented a typical “honeybee hive”−like porous structure with numerous exchangeable activity cations and combination sites in the silicate chain structure. The amorphous C − S − H products possessed marvelous recovery abilities for typical heavy metals as Cu (II), Zn (II), and Cr (III) in industrial wastewater with recovery efficiency all above 99.6% in quite a short period. The recovery mechanism of C − S − H toward heavy metals was revealed as calcium ions exchange and interlayer structure combination with SiO4 and AlO4 tetrahedron through the analysis of characterization technologies and DFT simulation calculation. C − S − H synthesized in SRL contributes to achieving valuable resources conversion and recycling for guiding sustainable development of coal-based solid waste comprehensive utilization. |
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| AbstractList | •Nano-crystalline C − S − H is synthesized from SRL by mild causticization and crystallization strategy.•High-efficiency separation of Na/Si components and alkali recycling can be collaboratively achieved from SRL.•C-S-H presents amorphous honeycomb porous structure and activity ions exchange sites.•Amorphous C − S − H exhibits quickly recovery performances to heavy metals Cu (II), Zn (II), and Cr (III).•Heavy metal recovery mechanisms are cations exchange and interlayer bonding proved by DFT simulation.
During sustainable high-value utilization of coal-based solid wastes, a kind of characteristic silicon-rich lye (SRL) generated, and its comprehensive recovery and recycling remains an important subject. Through a simple and facile strategy of mild caustic-crystallization method, SRL was favorably utilized through calcium silicate hydrate (C − S − H) synthesis with silicon conversion efficiency over 97.33%. The micro-morphology of C − S − H presented a typical “honeybee hive”−like porous structure with numerous exchangeable activity cations and combination sites in the silicate chain structure. The amorphous C − S − H products possessed marvelous recovery abilities for typical heavy metals as Cu (II), Zn (II), and Cr (III) in industrial wastewater with recovery efficiency all above 99.6% in quite a short period. The recovery mechanism of C − S − H toward heavy metals was revealed as calcium ions exchange and interlayer structure combination with SiO4 and AlO4 tetrahedron through the analysis of characterization technologies and DFT simulation calculation. C − S − H synthesized in SRL contributes to achieving valuable resources conversion and recycling for guiding sustainable development of coal-based solid waste comprehensive utilization. |
| ArticleNumber | 120092 |
| Author | Yang, Chennian Zhang, Yimin Qi, Fang Zhang, Jianbo Hou, Xinjuan Li, Shaopeng Li, Huiquan Zhu, Ganyu |
| Author_xml | – sequence: 1 givenname: Fang surname: Qi fullname: Qi, Fang organization: College of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China – sequence: 2 givenname: Ganyu surname: Zhu fullname: Zhu, Ganyu email: gyzhu@ipe.ac.cn organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China – sequence: 3 givenname: Yimin surname: Zhang fullname: Zhang, Yimin email: zym126135@126.com organization: College of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China – sequence: 4 givenname: Xinjuan surname: Hou fullname: Hou, Xinjuan organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China – sequence: 5 givenname: Shaopeng surname: Li fullname: Li, Shaopeng organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China – sequence: 6 givenname: Chennian surname: Yang fullname: Yang, Chennian organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China – sequence: 7 givenname: Jianbo surname: Zhang fullname: Zhang, Jianbo organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China – sequence: 8 givenname: Huiquan surname: Li fullname: Li, Huiquan organization: Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Chinese Academy of Sciences, Beijing 100190, China |
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