Center for Waste Management 'International Research Center', Sathyabama Institute of Science and Technology, Jeppiaar Nagar (OMR), Chennai 603 119, Tamil Nadu, India.
Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Tamil Nadu, India.
Sci Total Environ. 2022 Sep 20;840:156564. doi: 10.1016/j.scitotenv.2022.156564. Epub 2022 Jun 9.
Access to clean water has reduced in recent years due to pollution and man-made activities. Wastewater treatment regimens are many such as electrocoagulation, adsorption, ozonation, membrane and advanced oxidation processes. Owing to economical, resource availability and ease of operation adsorption has upper hand over all other methods employed in wastewater treatment. Graphene based adsorbents attracted researchers due to their ability to play dual role as adsorbent and photo-catalysts. When it comes to removal of heavy metals and dyes graphene-based aerogels are successful. Graphene composites were predominantly synthesized by top-down and bottom-up approach methods. Graphene composites are mesoporous and have microporous structure on surface. Graphene has copper desorption efficiency of 90 % upon 10th consecutive cycle. Graphene based adsorbents have adsorption efficiency of 367, 246 and 106.3 mg for lead, zinc and cadmium respectively. Though graphene possesses numerous applications, this review was devoted towards heavy metals removal from aqueous environment. In detail, the synthesis routes and interaction mechanism were explained and also the adsorption isotherms, kinetics were added. This review will serve as support for future research directions on removal of wastewater contaminants (heavy metals).
近年来，由于污染和人为活动，清洁水的获取量有所减少。废水处理方法有很多，例如电化学混凝、吸附、臭氧氧化、膜和高级氧化工艺。由于经济、资源可用性和操作简便性，吸附在废水处理中比其他所有方法都更具优势。基于石墨烯的吸附剂因其能够同时发挥吸附剂和光催化剂的作用而吸引了研究人员的注意。在去除重金属和染料方面，基于石墨烯的气凝胶是成功的。石墨烯复合材料主要通过自上而下和自下而上的方法合成。石墨烯复合材料具有介孔和表面微孔结构。石墨烯在第十个连续循环时铜的解吸效率为 90%。基于石墨烯的吸附剂对铅、锌和镉的吸附效率分别为 367、246 和 106.3mg。尽管石墨烯具有许多应用，但本综述专门针对从水环境中去除重金属。详细解释了合成路线和相互作用机制，并添加了吸附等温线和动力学。本综述将为未来去除废水污染物（重金属）的研究方向提供支持。
