Layered double hydroxides: a novel nano-sorbent for solid-phase extraction
H Abdolmohammad-Zadeh1, Z Rezvani, G H Sadeghi
1Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, 35 Km Tabriz-Marageh Road, P.O. Box 53714-161, Tabriz, Iran. h.abdol@azaruniv.edu, h abdol@yahoo.com
Analytica Chimica Acta
|December 21, 2010
Summary
Researchers developed a novel nickel-aluminum layered double hydroxide (Ni-Al LDH) solid-phase extraction (SPE) sorbent for detecting trace fluoride in water. This method offers a sensitive and efficient approach for environmental monitoring.
Area of Science:
- Materials Science
- Analytical Chemistry
- Environmental Science
Background:
- Layered double hydroxides (LDHs) are versatile nanomaterials with tunable properties.
- Accurate determination of trace fluoride in aqueous solutions is crucial for environmental and health assessments.
- Existing methods for fluoride analysis may require complex procedures or lack sensitivity.
Purpose of the Study:
- To synthesize and characterize nickel-aluminum layered double hydroxide (Ni-Al LDH) as a novel solid-phase extraction (SPE) sorbent.
- To develop a sensitive and efficient method for the pre-concentration and determination of trace fluoride ions in aqueous samples.
- To evaluate the performance of the Ni-Al LDH SPE method and compare it with a standard method.
Main Methods:
- Synthesis of nano-structured Ni-Al LDH via co-precipitation and hydrothermal treatment.
- Application of Ni-Al LDH as a solid-phase extraction (SPE) sorbent for fluoride pre-concentration.
- Indirect determination of fluoride using the quenching effect on Al-oxine complex fluorescence (spectrofluorometry).
Main Results:
- Ni-Al (NO3-) LDH effectively retained fluoride ions at pH 6.0.
- Fluoride was eluted using 1.2 mL of 3.0 mol L(-1) NaOH.
- The optimized method achieved a limit of detection of 9.0 ng mL(-1) and an enrichment factor of 50.
- The method demonstrated successful application in analyzing fluoride in real water samples.
Conclusions:
- Nano-structured Ni-Al LDH is a promising and effective sorbent for SPE of trace fluoride.
- The developed spectrofluorometric method offers high sensitivity and efficiency for fluoride determination.
- The proposed method provides a reliable alternative to the standard SPADNS method for water analysis.
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