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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.2 (2015)  >  pp.224-228

MATERIALS TRANSACTIONS
<<Previous article Vol.56  No.2 (2015)   pp.224 - 228 Next article>>

Rapid Synthesis of LDHs Using Dolomite as a Magnesium Source and Application to Borate Removal

Xinhong Qiu1), Mari Yoshida1), Tsuyoshi Hirajima1), Keiko Sasaki1)
1) Department of Earth Resources Engineering, Kyushu University

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°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 11B 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.


Keyword:
layered double hydroxides, microwave, dolomite, boron

Received: September 22, 2014
Accepted: November 13, 2014 , Published online: January 25, 2015

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