Design of a high-performance ternary LDHs containing Ni, Co and Mn for arsenate removal
| Autor: | Wenming Yao, Qingzhu Li, Hui Liu, Shuimei Li, Liyuan Chai, Qingwei Wang, Kaizhong Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Chemistry Ligand Health Toxicology and Mutagenesis Inorganic chemistry Layered double hydroxides Arsenate engineering.material Pollution Water Purification Active center Metal chemistry.chemical_compound Adsorption Transition metal visual_art visual_art.visual_art_medium engineering Hydroxides Environmental Chemistry Arsenates Ternary operation Waste Management and Disposal Water Pollutants Chemical |
| Zdroj: | Journal of hazardous materials. 427 |
| ISSN: | 1873-3336 |
| Popis: | To cope with the current serious arsenate pollution problem, a new ternary layered double hydroxides (LDHs) containing Ni, Co and Mn with good performance was developed, guiding by DFT calculations. First, Ni, Co and Mn were screened as the metal sources to constitute the LDHs, due to their high ionic charge density. Then, Ni(II), Co(II) and Mn(III)-O octahedra were selected as the primary units for structing the LDHs, because of their good chemical activity. Meanwhile, the ratio of metals in the ternary LDHs, favoring for arsenate removal, was optimized at 1:2:1. In addition, the synergistic effect among various metals in the LDHs was considered. The results suggested that in the case of single doping, all three metals can act as the center to promote chemical activity independently. On the contrary, when combined together, there is only one unilateral active center. Moreover, the existence of ligand covalent bonds between arsenate and LDHs was confirmed. Finally, a promising new NiCo2Mn-LDHs with the maximum adsorption capacity of 407.23 mg/g for arsenate removal had been prepared. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect