Alginate‐Derived Active Blend Enhances Adsorption and Photocatalytic Removal of Organic Pollutants in Water,Advanced Sustainable Systems

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Alginate‐Derived Active Blend Enhances Adsorption and Photocatalytic Removal of Organic Pollutants in Water
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2020-04-26 , DOI: 10.1002/adsu.201900112
Irene Vassalini ₁ , Joana Gjipalaj ₂ , Stefano Crespi ₃ , Alessandra Gianoncelli ₄ , Mariella Mella ₅ , Matteo Ferroni _{1,

6} , Ivano Alessandri ₁

Affiliation

The ever‐increasing need for clean water is one of the most urgent sustainable development goals, which requires environmentally‐friendly strategies for water remediation against different types of pollutants. In this work, the possibility of using alginate, a biocompatible and natural polysaccharide, is explored for the preparation of both oxide (TiO₂, Al₂O₃, and yttria‐stabilized ZrO₂ (YSZ)) macrobeads and an active blend of rich carbon nanoparticles, depolymerized alginate, formic acid, and a complex mixture of other organic acids. In particular, the active blend is obtained through low‐energy‐demanding microwave assisted digestion of sodium alginate solution, and it is used to enhance the decontamination activity of oxide macrobeads in mild conditions (e.g., low temperature, no pH buffers, and visible illumination). It is demonstrated that the alginate‐derived active blend obtained without the addition of any other chemicals increases primarily the adsorption capability of oxide macrobeads toward positively charged pollutants (methylene blue, crystal violet, and tetracaine) and, also, the photocatalytic activity of TiO₂ during their degradation. Interestingly, functionalization with the obtained alginate‐derived active blend enables better performance in comparison with functionalization of its single components or with carbon‐dots (C‐Dots) obtained with conventional and more energy‐demanding hydrothermal methods, enabling them to obtain a fully sustainable, environmentally‐friendly system for water remediation.

中文翻译：

藻酸盐衍生的活性混合物可增强水中有机污染物的吸附和光催化去除

对清洁水的日益增长的需求是最紧迫的可持续发展目标之一，这需要采取环境友好的策略来对各种类型的污染物进行水修复。在这项工作中，探索了使用藻酸盐（一种生物相容性天然多糖）制备氧化物（TiO ₂，Al ₂ O ₃和氧化钇稳定的ZrO _2）的可能性。（YSZ））大珠和富碳纳米颗粒，解聚的藻酸盐，甲酸以及其他有机酸的复杂混合物的活性混合物。尤其是，活性混合物是通过低能耗的微波辅助消化藻酸钠溶液而获得的，并用于在温和的条件下（例如，低温，无pH缓冲液和可见光）增强氧化物大珠的去污活性。）。结果表明，在不添加任何其他化学物质的情况下获得的藻酸盐衍生活性共混物，首先可以提高氧化物大珠对带正电污染物（亚甲基蓝，结晶紫和丁卡因）的吸附能力，并且还可以提高TiO ₂的光催化活性。在它们降解期间。有趣的是，与通过常规方法和对能量的要求更高的水热方法获得的单组分或碳点（C-Dots）的功能化相比，所获得的藻酸盐衍生的活性共混物的功能化可实现更好的性能。，环保的水修复系统。

更新日期：2020-04-26

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