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      Reduced graphene oxide as an effective adsorbent for removal of malachite green dye: Plausible adsorption pathways.

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          Abstract

          Efficient removal of malachite green (MG) dye from simulated wastewater is demonstrated using high surface area reduced graphene oxide (rGO). The plausible interaction pathways between MG dye and rGO are deduced from nanostructural features (HRTEM) of rGO and spectroscopic analyses (FTIR and Raman). The high surface area (931m(2)⋅gm(-1)) of rGO, π-π interaction between the aromatic rings of MG dye and graphitic skeleton, and electrostatic interaction of cationic centre of MG dye with π-electron clouds and negatively charged residual oxygen functionalities of rGO collectively facilitate the adsorption of MG dye on the rGO. The rGO displays adsorption capacity as high as 476.2mg⋅g(-1) for MG dye. The thermodynamic parameters calculated from the temperature dependent isotherms suggested that the adsorption was a spontaneous and endothermic process. These results promise the potential of high surface area rGO for efficient removal of cationic dyes for wastewater treatment.

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          Author and article information

          Journal
          J Colloid Interface Sci
          Journal of colloid and interface science
          Elsevier BV
          1095-7103
          0021-9797
          Sep 01 2017
          : 501
          Affiliations
          [1 ] Chemical Science Division, CSIR-Indian Institute of Petroleum, Dehradun 248005, India; Academy of Scientific and Innovative Research, New Delhi 110025, India.
          [2 ] Chemical Science Division, CSIR-Indian Institute of Petroleum, Dehradun 248005, India; Academy of Scientific and Innovative Research, New Delhi 110025, India. Electronic address: opkhatri@iip.res.in.
          Article
          S0021-9797(17)30435-6
          10.1016/j.jcis.2017.04.035
          28431217
          c629f338-043a-4c1e-9d56-d98320a7e0ba
          History

          Adsorption pathways,Malachite green,Reduced graphene oxide,Simulated wastewater,π-π interaction

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