期刊
MATERIALS TRANSACTIONS
卷 56, 期 2, 页码 224-228出版社
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.M-M2014844
关键词
layered double hydroxides; microwave; dolomite; boron
资金
- Japan Society for Promotion of Science (JSPS) [GR078]
- Progress 100 (World Premier International Researcher Invitation Program of Kyushu University)
- Ministry of Education, Culture, Sports, Science and Technology
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
- Grants-in-Aid for Scientific Research [15H02333] Funding Source: KAKEN
A rapid and efficient method based on microwave-assisted treatment has been developed for preparing layered double hydroxides (LDHs) using natural dolomite as a magnesium source. The aging temperature was 120 degrees C and the total synthetic time was only within 6 h. The product was fully characterized by elemental composition, powdery X-ray diffraction, and scanning electron microscopy, to be highly pure hydrotalcite with a flaky shape. The synthesized adsorbent exhibited the sorption capacity of 1.34 mmol/kg which is comparable to boron-specific resin. Based on B-11 MAS NMR and XRD results, the principal mechanism for borate immobilization on the LDHs is ion-exchange followed by transformation of polyborate into monoborate in a process of drying.
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