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首页> 外文期刊>Journal of Hazardous Materials >Robust photoactive nanoadsorbents with antibacterial activity for the removal of dyes
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Robust photoactive nanoadsorbents with antibacterial activity for the removal of dyes

机译：强大的具有抗菌活性的光敏纳米吸附剂，可去除染料

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ZnO nanostructures (NS)/guar gum (GG) nanocomposites have been successfully synthesized and tested as sorbents for photodegradation, adsorption and antimicrobial activity for dye removal. The addition of ZnO improves the thermal stability of GG based on the ratio of the oxygen in the OH form and the total oxygen in the samples as indicated via XPS and FTIR analyses. Among all tested composites, the ZnO NPs/GG nanocomposite showed the highest photocatalytic activity and hence used in extended adsorption and degradation studies against the anionic dye reactive red (RR195) and the cationic dye Rhodamine B (RhB). The adsorption mechanism and kinetics were studied in details. The ZnO NPs/GG nanocomposite showed quite high removal efficiency for both dyes reaching about 96 degradation percent of the initial dye concentration as well as a high adsorption capacity reaching 70 mg g(-1). The adsorption of both dyes on ZnO NPs/GG was found to obey the Freundlich adsorption model with pseudo-second-order kinetics. The antibacterial assay showed an enhanced antibacterial effect of ZnO/GG against E-Coli/TOP10 (PTA 10989) strain compared to pristine ZnO or pure guar gum. The obtained results were proved to be of high significance based on the statistical analysis using one-way ANOVA followed by Tukeys analysis.
机译：ZnO纳米结构（NS）/瓜尔胶（GG）纳米复合材料已成功合成，并经过测试可作为光降解，吸附和抗菌活性染料的吸附剂。 ZnO的添加基于OH形式的氧气与样品中总氧气的比值（如XPS和FTIR分析所示）提高了GG的热稳定性。在所有测试的复合材料中，ZnO NPs / GG纳米复合材料显示出最高的光催化活性，因此可用于针对阴离子染料活性红（RR195）和阳离子染料若丹明B（RhB）的扩展吸附和降解研究。详细研究了吸附机理和动力学。 ZnO NPs / GG纳米复合材料对两种染料均显示出很高的去除效率，达到初始染料浓度的约96％的降解率，以及达到70 mg g（-1）的高吸附能力。发现两种染料在ZnO NPs / GG上的吸附均符合Freundlich吸附模型的拟二级动力学模型。与原始ZnO或纯瓜尔豆胶相比，抗菌测定显示ZnO / GG对E-Coli / TOP10（PTA 10989）菌株的抗菌作用增强。基于单向方差分析和Tukeys分析的统计分析，证明所获得的结果具有重要意义。

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