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Title: Preparation of magnesium hydroxide nanoflowers from boron mud via anti-drop precipitation method

Highlights: • We use the anti-drop precipitation method for synthesis of magnesium hydroxide. • Boron mud which is solid waste from a borax factory is used as the magnesium source. • The magnesium hydroxide nanoflowers are prepared in a short time. • The as-prepared magnesium hydroxide can be used as an effective flame retardant. - Abstract: Using boron mud as the starting material, the flower-like magnesium hydroxide (MH) has been successfully prepared via anti-drop precipitation method. The effect of NH{sub 3}·H{sub 2}O concentration, aging time, and surfactant on the morphology of MH was investigated. The optimum precipitation conditions are dropping MgSO{sub 4} solution in 5% NH{sub 3}·H{sub 2}O solution, with 3% polyethylene glycol as surfactant, aging for 30 min. XRD, SEM, FI-IR, and TG/DTA have been employed to characterize the as-prepared samples. XRD reveals that MH with high purity has the brucite structure. SEM images show that the flower-like MH exists in the form of mono-disperse well uniform spherical aggregation with diameter of 3–5 μm. TG/DTA shows a total percentage of weight loss 33.6% with a well-defined endothermic peak near 381.3 °C corresponding to the decomposition of MH. Furthermore, it reports that the extremely fast primary nucleation is of significancemore » for crystal growth of MH.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2]
  1. School of Materials Science and Technology, China University of Geosciences, Beijing 100083 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22420534
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 56; Other Information: Copyright (c) 2014 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:
36 MATERIALS SCIENCE; AGGLOMERATION; AGING; AMMONIA; BORAX; BORON; CONCENTRATION RATIO; CRYSTAL GROWTH; CRYSTAL STRUCTURE; DECOMPOSITION; DIFFERENTIAL THERMAL ANALYSIS; MAGNESIUM HYDROXIDES; MAGNESIUM SULFATES; NUCLEATION; POLYETHYLENE GLYCOLS; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; X-RAY DIFFRACTION