Abstract

The adsorption of triphenylmethane dyes on the surface of nanostructured oxide materials has been successfully applied for the removal of dye from wastewater. Although this removal strategy does not generate harmful substances, the adsorption is not destructive and involves a phase transfer of pollutants to other secondary wastes. Due to these disadvantages, it is necessary to evaluate eco-friendly biological strategies to remove the adsorbed contaminants, to reuse them and to continue taking advantage of its adsorption capacity. Information concerning regeneration of nanostructured oxide material by biologic methods is currently unavailable. In the present study, the regeneration of titanate nanotubes (TNTs) was investigated and compared in the presence of two different fungal species: Aspergillus niger and Penicillium sp. Efficient regeneration of TNTs was achieved in the presence of both fungal species and no significant differences were observed. The adsorption capacity of the regenerated TNTs decreased by only 38 and 48% for A. niger and Penicillium sp., respectively. The UV–Vis, FTIR analysis, and TEM images confirmed the complete desorption of BF and the preservation of the tubular structure of TNTs. This study demonstrates that the regeneration of TNTs using biological activity could represent an efficient alternative over physico-chemical regeneration.

中文翻译：

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黑曲霉和青霉菌对钛酸纳米管的再生。在静态条件下

摘要

三苯基甲烷染料在纳米结构氧化物材料表面的吸附已成功地用于去除废水中的染料。尽管这种清除策略不会产生有害物质，但吸附不会造成破坏，并且会涉及污染物向其他二次废物的相转移。由于这些缺点，有必要评估生态友好的生物策略以去除所吸附的污染物，对其进行再利用并继续利用其吸附能力。目前尚无有关通过生物方法再生纳米结构氧化物材料的信息。在本研究中，在两种不同的真菌物种：黑曲霉和黑曲霉的存在下，研究并比较了钛酸酯纳米管（TNT）的再生。青霉属。在两种真菌都存在的情况下，TNTs的高效再生得以实现，没有观察到明显差异。对于黑曲霉和青霉菌，再生的TNTs的吸附能力仅分别降低了38％和48％。UV-Vis，FTIR分析和TEM图像证实了高炉的完全脱附和TNT管状结构的保存。这项研究表明，利用生物活性再生TNTs可以代表一种比物理化学再生有效的替代方法。