Tannic acid/Fe3+ functionalized magnetic graphene oxide nanocomposite with high loading of silver nanoparticles as ultra-efficient catalyst and disinfectant for wastewater treatment

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-02, Vol.405, p.126629, Article 126629
• Main Authors: Yang, Wenshuai, Hu, Wenjihao, Zhang, Jiawen, Wang, Wenda, Cai, Ruiqi, Pan, Mingfei, Huang, Charley, Chen, Xingzhen, Yan, Bin, Zeng, Hongbo
• Format: Article
• Language: English
• Subjects: Antimicrobial capability; Magnetic graphene oxide; Organic pollutants; Silver nanoparticles; Tannic acid
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2020.126629

[Display omitted] •A novel Ag NPs nanocomposite with extremely high loading of Ag NPs is synthesized.•The nanocomposite shows superior catalytic capacity to various organic pollutants.•The nanocomposite shows outstanding antimicrobial performance and recyclability.•The synergistic adsorption-catalytic reduction mechanism is discussed. Silver nanoparticle (Ag NPs) and their nanocomposite materials have been widely applied as catalysts and disinfectants for wastewater treatment. However, most reported Ag NP-based nanocomposites possess a low loading of Ag NPs, which require a high dosage to achieve satisfactory catalytic decontamination performance to organic pollutants and good disinfection to the bacteria. Herein, we synthesize a novel Ag NPs nanocomposite with an extremely-high loading of Ag NPs (up to 30 wt%) via tannic acid (TA)/Fe3+ complexation by using magnetic graphene oxide (MGO). The Ag@MGO-TA/Fe3+ catalyst shows excellent stability in aqueous environment and can achieve an ultrahigh catalytic reduction rate of 0.054 s−1 for methylene blue (MB) at an extremely low dosage (i.e., 0.05 mg/mL), which is about ten times higher than that of most NPs-based catalysts reported previously under similar condition. Moreover, the magnetic nanocomposites can be easily regenerated and are highly recyclable without any obvious performance loss. In addition, the novel Ag@MGO-TA/Fe3+ nanocomposites exhibit disinfection performance against Escherichia coli (E. coli) with ~100% killing efficacy at a very low dosage (i.e., 20 μg/mL). This work provides new insights into the rational design of advanced recyclable NP-based nanomaterials with ultrahigh catalytic rate and outstanding antimicrobial performance for water treatment and various environmental engineering applications.