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| Simple synthesis of hierarchical ZnO microspheres for organic dyes removal |
| Author Name | Affiliation | E-mail | | SUN Tong-Ming | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | | | YOU Meng | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | | | WANG Dan-Qi | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | | | CUI Ying | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | | | CUI Hui-Hui | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | | | WANG Miao | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | wangmiao@ntu.edu.cn | | TANG Yan-Feng | School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China | tangyf@ntu.edu.cn |
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| Abstract: Uniform and dispersed 3D hierarchical nanosheets-assembled ZnO microspheres were fabricated by a simple ethylene glycol (EG)-assisted solvothermal route, in which hexamethylenetetramine (HMTA) was selected as a functional agent. A series of controllable experiments proved that HMTA and the solvent play vital roles in the formation of hierarchical microspheres. The assembly of 2D nanosheets to construct the 3D hierarchical structures not only increases the specific surface area of the products but also builds more charge transport channels. The samples were evaluated as adsorbents for the removal of some organic dyes from the aqueous solution in dark. Resultantly, the hierarchical nanosheets-assembled ZnO microspheres showed excellent removal rate and selectivity for anionic dyes. Taking Congo red (CR) as a representative dye, it can be removed 95.67% after five adsorption cycles due to the synergistic effects of hierarchical structures, large surface areas, and electrostatic attraction. The kinetics studies confirmed that the adsorption of CR onto ZnO microspheres is physisorption and followed the pseudo-second-order kinetic and Langmuir isotherm models. |
| Keywords: ZnO hierarchical structures nanomaterials organic dyes adsorption |
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| SUN Tong-Ming,YOU Meng,WANG Dan-Qi,CUI Ying,CUI Hui-Hui,WANG Miao,TANG Yan-Feng.Simple synthesis of hierarchical ZnO microspheres for organic dyes removal[J].Chinese Journal of Inorganic Chemistry,2023,39(6):1131-1138. |
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