期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 158, 期 -, 页码 285-294出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.10.035
关键词
ZnO nanostructure; Cement nanocomposites; Photocatalyst; Hydrophobic cement; Antimicrobial
资金
- Science and Engineering Research Board, New Delhi
In this work, ZnO nanoneedles were synthesized employing a co-precipitation method. Further, white cement composites were prepared with ZnO filler of 5%, 10% and 15% by weight ratio. With the increasing concentration of ZnO in cement matrix the synergetic effect between ZnO and white cement matrix was observed through FE-SEM and UV-visible. We studied the photocatalytic degradation of pollutant (Rhodamine 6G) using ZnO nano-needles embedded in white cement matrix under ultraviolet irradiation (UV) along with enhanced hydrophobic nature and the antimicrobial property of the cement. The pseudo first order kinetics was found in a photocatalytic process, and degradation rate constant was enhanced up to 0.147 min(-1) for ZnO modified cement which was significantly higher than the pure cement (0.037 min(-1)). Antimicrobial studies were performed using bacterial strains Escherichia.coli (JM109, Promega Gram negative), Bacillus subtilis (MTCC121, Gram-positive) and fungal strain Aspergillus niger (MTCC281) for all the composites. A significant improvement in bacterial and fungal degradation was observed in ZnO modified cement than control and pure cement in a dose-dependent manner. (C) 2017 Elsevier Ltd. All rights reserved.
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