The aim of this study was to investigate the removal of high fluoride concentrations by Mg/Al layered double hydroxide (LDH). Batch experiments were conducted using calcined Mg/Al LDH at 105 °C (LDH-105), 300 °C (LDH-300), and 700 °C (LDH-700). The Brunauer-Emmett-Teller (BET) analysis showed that the specific surface area of LDH-700 was 1.7−1.8 times larger than those of LDH-105 and LDH-300. The X-ray diffractometry (XRD) analysis indicated that LDH-105 had a layered structure (Mg4Al2(OH)12CO3 · 3H2O) while LDH-300 and LDH-700 were composed of mixed metal oxides (Al8O3N6 + Mg0.44Al0.56) and magnesium oxide (MgO), respectively. Batch tests showed that the fluoride sorption capacity of LDH-700 was 1.7−2.9 times greater than those of LDH-105 and LDH-300 at initial fluoride concentrations of 100 and 200 mg/L. The kinetic data showed that fluoride sorption to LDH-700 arrived at equilibrium after 12 h. The equilibrium test demonstrated that the maximum sorption capacity of LDH-700 was 91.401 mg/g. Additional batch experiments indicated that the sorption capacity of LDH-700 decreased slightly when the solution pH was increased from 4.0 to 9.0. Moreover, fluoride sorption to LDH-700 decreased considerably in the presence of anions such as phosphate, sulfate, and carbonate in the following order: HPO42− > SO42− > CO32− > Cl− > NO3−.
Skip Nav Destination
Article navigation
Research Article|
March 01 2013
Fluoride removal using calcined Mg/Al layered double hydroxides at high fluoride concentrations Available to Purchase
Jae-Hyun Kim;
Jae-Hyun Kim
1Environmental Biocolloid Engineering Laboratory, Seoul National University, Seoul 151-921, Korea
Search for other works by this author on:
Chang-Gu Lee;
Chang-Gu Lee
1Environmental Biocolloid Engineering Laboratory, Seoul National University, Seoul 151-921, Korea
Search for other works by this author on:
Jeong-Ann Park;
Jeong-Ann Park
1Environmental Biocolloid Engineering Laboratory, Seoul National University, Seoul 151-921, Korea
Search for other works by this author on:
Jin-Kyu Kang;
Jin-Kyu Kang
1Environmental Biocolloid Engineering Laboratory, Seoul National University, Seoul 151-921, Korea
Search for other works by this author on:
Seo-Young Yoon;
Seo-Young Yoon
1Environmental Biocolloid Engineering Laboratory, Seoul National University, Seoul 151-921, Korea
Search for other works by this author on:
Song-Bae Kim
2Department of Rural Systems Engineering/Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea
E-mail: [email protected]
Search for other works by this author on:
Water Supply (2013) 13 (2): 249–256.
Article history
Received:
April 30 2012
Accepted:
August 07 2012
Citation
Jae-Hyun Kim, Chang-Gu Lee, Jeong-Ann Park, Jin-Kyu Kang, Seo-Young Yoon, Song-Bae Kim; Fluoride removal using calcined Mg/Al layered double hydroxides at high fluoride concentrations. Water Supply 1 March 2013; 13 (2): 249–256. doi: https://doi.org/10.2166/ws.2013.001
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00