[논문]Incorporation of iron (oxyhydr)oxide nanoparticles with expanded graphite for phosphorus removal and recovery from aqueous solutions

Do, Quoc Cuong; Ko, Seok-Oh; Jang, Am; Kim, Yuri; Kang, Seoktae

doi:10.1016/j.chemosphere.2020.127395

[해외논문] Incorporation of iron (oxyhydr)oxide nanoparticles with expanded graphite for phosphorus removal and recovery from aqueous solutions

Chemosphere, v.259, 2020년, pp.127395 -

Do, Quoc Cuong (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) , Ko, Seok-Oh (Department of Civil Engineering, Kyung Hee University (KHU)) , Jang, Am (Graduate School of Water Resources, Sungkyunkwan University (SKKU)) , Kim, Yuri (EB-TECH Co.) , Kang, Seoktae (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))

Abstract ▼ AI-Helper

Abstract In this work, iron (oxyhydr)oxide nanoparticle-doped expanded graphite (IO/EG-1 and IO/EG-2) was prepared via a hydrothermal reaction and applied for the phosphorus adsorption in the aqueous solutions. The analysis of scanning electron microscopy (SEM) and X-ray diffraction (XRD) verified the successful fabrication of IO/EGs, and iron (oxyhydr)oxide nanoparticles became more crystalized according to the calcination at high temperature (IO/EG-2). The maximum adsorption capacity of IO/EG-1 was considerably higher (7.30 mg/g) than that of IO/EG-2 (0.70 mg/g) mainly due to the electrostatic interaction between the negatively charged phosphate ions with iron (oxyhydr)oxides. At the neutral pH, IO/EG-1 exhibited more positively charged than IO/EG-2, which the iso-electric points (IEP) were pH of 9.1 and 6.0, respectively. The thermodynamic study also suggested that the phosphorus adsorption energy of IO/EG-1was considerably favorable (−12.13 kJ/mol) than that of IO/EG-2 (−7.43 kJ/mol). The regeneration of IO/EG-1 were efficiently achieved by a simple extraction using an alkaline solution such as NaOH. Overall, our study suggested that the prepared IO/EGs could be used as good adsorbents for the phosphorus recovery from aqueous solutions. Highlights Iron (oxyhydr)oxide nanoparticles (IO/EG) were immobilized on expanded graphite. IO/EG adsorbed phosphate ions by the electrostatic interaction. The adsorption capability was easily restored by alkaline solution.

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