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Title: Influence of Al substitution on magnetism and adsorption properties of hematite

A series of Al-substituted hematite was prepared. The structures and properties of as-prepared samples were characterized by various techniques. The magnetic property of the samples was determined and the adsorption of three dyes Acid Blue 74, Methylene Blue and Phenol Red onto the samples was investigated. The results showed that Al incorporation into the crystal structure of hematite occurs via isomorphous ionic substitution of Al for Fe. With increasing Al content, the particle size of samples decreases, the magnetization increases and the remanent magnetization remains unchanged. The coercivity of the samples increases with Al substitution up to n{sub Al}/n{sub Fe} 0.03, and then decreases as Al content further increases. Compared with Al-free hematite, Al-substituted samples exhibit better adsorption ability to all of the three dyes. The adsorption rates of the three dyes on the surface of Al substituted samples depend on the structure of dye, pH and Al content in hematite. - Graphical abstract: Effect of Al on the structure, magnetic properties and adsorption performance of hematite was investigated. - Highlights: • A series of Al-substituted α-Fe{sub 2}O{sub 3} was prepared. • Effect of Al content on the crystal structure and magnetic property of hematite was investigated. • Al-substituted hematitemore » exhibits better adsorption ability than hematite.« less
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [2]
  1. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22486723
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 228; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; ALUMINIUM; COERCIVE FORCE; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; DYES; FERRITES; HEMATITE; IRON; IRON OXIDES; MAGNETIC PROPERTIES; MAGNETISM; MAGNETIZATION; METHYLENE BLUE; PARTICLE SIZE; PH VALUE; PHENOL; SURFACES