Department of Environmental Science, School of Life Sciences, Periyar University, Salem, 636011, Tamil Nadu, India.
Department of Chemistry, Sri Sarada College for Women, Salem, 636011, Tamil Nadu, India.
Chemosphere. 2021 Mar;267:129201. doi: 10.1016/j.chemosphere.2020.129201. Epub 2020 Dec 8.
Dyes and heavy metals pollution have become a major environmental concern worldwide. Various methods, such as advanced oxidation, biodegradation, precipitation, flocculation, ultra filtration, ion-exchange, electro-chemical degradation and coagulation, have been proposed for the removal of dyes and heavy metals from contaminated wastewater. Of these methods, adsorption and detoxification are considered as the most promising and economically viable. Polyaniline-based composites, a material prepared by combining polyaniline with one or more similar or disimilar materials, have been reported as good adsorbents to remove and detoxify different groups of pollutants due to their unique physical and chemical properties. In the last decade, several studies have reported the effective adsorption (∼95%) of dyes and heavy metals onto polyaniline based composites. Furthermore, some polyaniline -composites reduced the adsorbed heavy metals into less toxic state. This review compiles the application of different polyaniline composites for adsorption and/or detoxifcation of dyes and heavy metals and documents composite preparation methods, morphology and properties of the composites, and mechanism of dyes and heavy metals adsorption. Based on the avilabile literature, this review suggests that more studies are warranted to understand the influence of various conditions and experimental variables on dyes and heavy metals removal from wastewater and/or aqueous solution.
染料和重金属污染已成为全球主要的环境问题。各种方法，如高级氧化、生物降解、沉淀、絮凝、超滤、离子交换、电化学降解和混凝，已被提出用于去除受污染废水中的染料和重金属。在这些方法中，吸附和解毒被认为是最有前途和经济可行的方法。基于聚苯胺的复合材料是通过将聚苯胺与一种或多种相似或不同的材料结合而制备的材料，由于其独特的物理和化学性质，已被报道为去除和解毒不同类型污染物的良好吸附剂。在过去的十年中，有几项研究报道了将染料和重金属有效吸附（约 95%）到基于聚苯胺的复合材料上。此外，一些聚苯胺复合材料将吸附的重金属还原为毒性较低的状态。本文综述了不同聚苯胺复合材料在吸附和/或解毒染料和重金属方面的应用，并记录了复合材料的制备方法、复合材料的形貌和性能以及染料和重金属吸附的机理。根据现有文献，本综述表明，需要进行更多的研究来了解各种条件和实验变量对从废水中去除染料和重金属以及/或水溶液的影响。
