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Photocatalytic, hydrophobic and antimicrobial characteristics of ZnO nano needle embedded cement composites

机译：ZnO纳米针刺水泥复合材料的光催化，疏水和抗菌特性

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摘要

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.
机译：在这项工作中，采用共沉淀法合成了ZnO纳米针。此外，用5重量％，10重量％和15重量％的ZnO填料制备白水泥复合材料。随着水泥基中ZnO浓度的增加，通过FE-SEM和紫外可见光观察到ZnO与白水泥基体的协同作用。我们使用嵌入在白水泥基体中的ZnO纳米针在紫外辐射（UV）下研究了污染物（Rhodamine 6G）的光催化降解，并增强了水泥的疏水性和抗菌性能。在光催化过程中发现了拟一级动力学，并且ZnO改性水泥的降解速率常数提高到0.147 min（-1），明显高于纯水泥（0.037 min（-1））。对于所有复合材料，均使用细菌菌株大肠杆菌（JM109，Promega革兰氏阴性），枯草芽孢杆菌（MTCC121，革兰氏阳性）和真菌菌株黑曲霉（MTCC281）进行了抗菌研究。与对照和纯水泥相比，ZnO改性水泥在细菌和真菌降解方面有显着改善，且呈剂量依赖性。 （C）2017 Elsevier Ltd.保留所有权利。

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