title: Glutaraldehyde cross-linked magnetic chitosan nanocomposites: Reduction precipitation synthesis, characterization, and application for removal of hazardous textile dyes.
abstract: Magnetic chitosan nanocomposites (MCNCs) were synthesized by an inexpensive reduction precipitation technique using a glutaraldehyde cross-linking agent at room temperature. Successful chitosan coating of iron oxide nanoparticles was confirmed by X-ray photoemission spectroscopy. X-ray diffraction data revealed crystalline particle sizes for the iron oxide and MCNCs to be around 6-7 and 8-9 nm, respectively. In addition, the MCNCs exhibited supermagnetic properties having magnetic saturation of 17.5 emu/g. The synthesized MCNCs showed 91.60% absorption of Acid Red 2, while iron oxide 16.40% absorption; enhanced performance in MCNCs was resulted from presence of free amino and hydroxyl groups. Furthermore, the optimum pH and adsorbent concentration were 3 and 1.0 g/L, respectively. The Redlich-Peterson isotherm fit experimental data better than Langmuir and Freundlich models, based on non-linear regression. Finally, MCNCs showed 96% American Dye Manufacturing Institute (ADMI) value removal and gave recovery efficiency of 100%, making them attractive for further practical applications.
authors.affiliation: Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-Gu, Daegu 702-701, Republic of Korea.
authors.forename: Avinash A
authors.initials: AA
authors.lastname: Kadam
authors.affiliation: Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-Gu, Daegu 702-701, Republic of Korea. Electronic address: daesung@knu.ac.kr.
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D011232:Chemical Precipitation; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000302:isolation & purification*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D005976:Glutaral / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D060328:Magnetic Phenomena; D053761:Nanocomposites; D013696:Temperature; D013784:Textiles; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification
chemical_list: D048271:Chitosan; D004396:Coloring Agents; D003432:Cross-Linking Reagents; D005976:Glutaral; D062065:Wastewater
keywords: Adsorption; Chitosan; Iron oxide nanoparticles; Magnetic nanocomposites; Textile wastewater