Magnetic graphene-based nanocomposites as highly efficient absorbents for Cr(VI) removal from wastewater
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RESEARCH ARTICLE
Magnetic graphene-based nanocomposites as highly efficient absorbents for Cr(VI) removal from wastewater Xiuxiu Zhang 1,2,3 & Guiyun Yi 1,2,3 & Zhengting Zhang 1,2,3 & Jia Yu 1,2,3 & Haiyang Fan 1,2,3 & Peng Li 1,2,3 & Huihui Zeng 1,2,3 & Baolin Xing 1,2,3 & Lunjian Chen 1,2,3 & Chuanxiang Zhang 1,2,3 Received: 4 August 2020 / Accepted: 10 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Due to the merits of their high adsorption and convenient separation, magnetic graphene-based composites have become a promising adsorbent in terms of wastewater treatment. However, recycling and regeneration properties of magnetic graphenebased composites are still a conundrum, which remains to be resolved. Here, Fe3O4/reduced graphene oxide (RGO) (Fe3O4/ RGO) nanocomposites were synthesized by one-step solvent-thermal reduction route and used as adsorbents for water purification. It was encouraging to find that the nanocomposites possessed many intriguing properties in removing of Cr(VI) ions, including high adsorption efficiency and excellent recycling and regeneration property. The results indicated that the magnetic separation process of the Fe3O4/RGO nanocomposites only took less than 5 s and the maximum removal efficiency of Cr(VI) reached 99.9% under the optimum experimental conditions. Most significantly, the adsorption rate of Cr(VI) can still be as high as 98.13% after 10 cycles and the single recycle quality of the nanocomposites can maintain at more than 80%. As a result, the Fe3O4/RGO nanocomposites could be a potential adsorbent for removing heavy metal ions effectively, especially in environmental protection and restoration. Keywords Magnetic graphene-based composites . Recycling . Regeneration . Adsorption . Heavy metal ions . Mechanism
Introduction With the rapid development of industry, water pollution caused by heavy metal ions, such as cobalt(Co(II)), chromium (Cr(VI)), lead (Pb(II)), and copper (Cu(II)), has been a considerable problem in terms of their toxic harm to the environment and human health (Xu and Wang 2017; Fu and Wang 2011; Guilherme and Mckay 2020; Tito et al. 2013). Compared with other treatment options developed in recent years, such as photocatalytic reduction, ions exchange, Responsible Editor: Tito Roberto Cadaval Jr. * Guiyun Yi [email protected] 1
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2
Collaborative Innovation Center of Coal Work Safety of Henan Province, Jiaozuo 454003, China
3
Henan Key Laboratory of Coal Green Conversion, Jiaozuo 454003, China
membrane separation, and electrochemical techniques, adsorption is recognized as a suitable technique for removing heavy metal ions owing to its convenient operation, economic feasibility and availability of lots of adsorbents (Ren et al. 2018; Fu and Wang 2011; Panda et al. 2017; Sabrina et al. 2019; Mauro et al. 2018). For the past few years, graphene-based materials have attracted extensive attention as adsorbents for elimina
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