Synthesis and characterization of L-arginine/Fe3O4 adsorbent for the removal of methyl orange from aqueous solutions
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A novel magnetic nano adsorbent based on L-arginine anchored on nano magnetic Fe3O4 particles (MNPs-L) was prepared for removing methyl orange (MO) from aqueous solution. FT-IR and TGA results showed that L-arginine had been modified on the surface of nano magnetic Fe3O4 particles. Influences of many factors on adsorption process were studied, including ionic strength, contact time, initial concentration, pH, and temperature. Kinetics data was found to be followed by pseudo-second-order model. Boyd model suggested that external mass transfer was worse than intraparticle diffusion at rate control for MO adsorption onto MNPs-L. Langmuir model has a full explanation of isotherm data with predicted maximum adsorption capacity for MO to be 149.32 mg/g at 293 K. Moreover, the regeneration assays indicated that MNPs-L had a good stability in recycling. Hence, MNPs-L was a potential adsorbent for removing MO from wastewater.
KeywordsNano magnetic adsorbent Methyl orange Adsorption L-Arginine
This work was supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2018PEE006), Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (Grant No. 2015RCJJ018), and Qingdao Postdoctoral Application Research Project Funding.
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