Yoon, Seo-Young Lee, Chang-Gu Kim, Jae-Hyun Kang, Jin-Kyu Park, Jeong-Ann Kim, Song-Bae 2024-01-20T02:01:54Z 2024-01-20T02:01:54Z 2022-01-25 2017-03 1944-3994 https://pubs.kist.re.kr/handle/201004/122969 The aim of this study was to synthesize and characterize zeolite-based magnetic polymer composites (m-ZPC) for Cu(II) and Cr(III) removal from aqueous solutions. Synthetic zeolite NaA and magnetic iron oxide nanoparticles were immobilized into blended polymer hydrogels composed of poly(vinylidene fluoride) (PVDF) and poly(vinyl alcohol) (PVA) in order to prepare m-ZPC (average particle diameter = 2.97 +/- 0.18 mm). Stability tests for m-ZPC against acidic and alkaline solutions indicate that it was stable between solution pHs of 2.0 and 9.0. Batch experiments demonstrate that the maximum adsorption capacities for Cu(II) and Cr(III) were 3.90 and 2.04 mg/g, respectively. The removal of Cu(II) and Cr(III) increased as the pH increased from 2.0 to 5.0. The removal of Cu(II) and Cr(III) was enhanced with a rise of temperature from 15 degrees C to 45 degrees C. In addition, m-ZPC could be reused for Cu(II) removal after regeneration with 5 M NaCl solution. Thermodynamic analyses indicate that the removal of Cu(II) and Cr(III) was endothermic and spontaneous sorption processes (Cu(II):Lambda H degrees = 115.0 kJ/mol; Lambda G degrees = -5.13 to -17.64 kJ/mol, and Cr(III): Lambda H degrees = 73.0 kJ/mol; Lambda G degrees = -2.50 to -10.36 kJ/mol). This study demonstrates that m-ZPC can be used as a magnetic adsorbent for heavy metal removal in combination with magnetic separation. English DESALINATION PUBL Characterization of magnetic zeolite-polymer composites for Cu(II) and Cr(III) removal from aqueous solutions Article 10.5004/dwt.2017.20392 1 DESALINATION AND WATER TREATMENT, v.67, pp.261 - 270 DESALINATION AND WATER TREATMENT 67 261 270 N scie scopus 000403569700030 2-s2.0-85020293254 Engineering, Chemical Water Resources Engineering Water Resources Article IRON-OXIDE NANOPARTICLES WASTE-WATER HEXAVALENT CHROMIUM TRIVALENT CHROMIUM ADSORPTION EXCHANGE NANOCOMPOSITES CHITOSAN CR(VI) COPPER Chromate Copper Magnetic polymer composite Poly(vinyl alcohol) Poly(vinylidene fluoride)