Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 287, Issue -, Pages 268-277Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.01.066
Keywords
Boron; Hydrocalumite; Calcination; Ettringite; Mechanism
Categories
Funding
- Funding Program for Progress 100 (World Premier International Researcher Invitation Program) through the operating expense grants of the Ministry of Education, Culture, Sports, Science and Technology
- New Energy and Industrial Technology Development Organization (NEDO) under the Innovative Zero-Emission Coal-Fired Power Generation Project
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Hydrocalumite (Ca-Al-layered double hydroxide (LDH)) was prepared and applied for the removal of borate. The properties of Ca-Al-LDH calcined at different temperatures were diverse, which affected the sorption density and mechanism of boron species. The sorption density increased with increase in calcined temperature and the sample calcined at 900 degrees C (Ca-Al-LDH-900) showed the maximum sorption density in this work. The solid residues after sorption were characterized by B-11 NMR, Al-27 NMR, SEM, and XRD to investigate the sorption mechanism. Dissolution-reprecipitation was the main mechanism for sorption of borate in Ca-Al-LDH. For Ca-Al-LDH calcined at 300 and 500 degrees C, regeneration occurred in a short time and the newly forming LDHs were decomposed to release Ca2+ ions and formed ettringite with borate. Two stages occurred in the sorption of boron by Ca-Al-LDH calcined at 900 degrees C. In the first stage, boron species adsorbed on the alumina gel resulting from the hydration of calcined products. In this stage, borate was included as an interlayer anion into the newly forming LDHs in the following stage, and then immobilized as HBO32- into the interlayer, most the LDHs. (C) 2015 Elsevier B.V. All rights reserved.
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