期刊
DESALINATION
卷 521, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.desal.2021.115392
关键词
Anion exchange; Kirkendall effect; Cu7S4; Hollow morphology; Adsorption
This study presents a two-step process to grow ultrathin nano sheets on Cu7S4 nanotubes, resulting in Cu7S4-NS-T with extraordinary adsorption ability for anionic dyes removal. Chemical adsorption is the main control process for the enrichment of the dyes, making Cu7S4-NS-T a novel effective adsorbent for water treatment.
The growth of unique two-dimensional nanosheets on hollow and porous metal sulfides has received significant attention in adsorption and catalysis applications. Herein, we report a facile strategy to grow ultrathin nano sheets (NSs) on Cu7S4 nanotubes (NTs) via a two-step process (Cu7S4-NS-T). First, the obtained Cu nanowires (NWs) are oxidized in a hydrogen peroxide solution to form Cu@CuO composite nanowires decorated with ultrathin CuO NSs. Then, Cu7S4-NS-T composed of Cu7S4 NTs and Cu7S4 NSs is obtained from Cu@CuO NWs via a sulfurization process with the Kirkendall effect, in which anion-exchange reaction between Cu@CuO and S2- anions resulted in the formation of hollow structure. Due to fuse porous nanotubes and ultrathin nanosheets with abundant exposed copper centers, the obtained Cu7S4-NS-T shows extraordinary adsorption ability for the removal of anionic dyes, such as Congo red (CR) with a maximum adsorption capacity of 1166.07 mg/g, much superior to that of commercial activated carbon. Adsorption equilibrium and kinetic studies indicate that chemisorption is the main control process for the enrichment of the anionic dyes. The Cu7S4-NS-T can be used as a novel effective adsorbent for rapidly and efficiently removing dyes contaminants in water.
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