Abstract
In this paper, NiAl layered double hydroxides (NiAl-LDHs) has been modified by non-thermal plasma (NTP) to enhance the fluoride removal capacity of materials. The samples were characterized by X-ray diffraction, Fourier transform infrared spectrometer (FTIR), Thermogravimetric differential thermal analyzer (TG-DTA) and N2 adsorption-desorption. Effects of pH, co-existing anions, temperature and kinetics on F﹣ adsorption were investigated. The results showed that pH affects the adsorbent surface charge. The effective pH range for F﹣ removal was between 4.5 and 10. Lower pH potentially causes dissolution of NiAl-LDHs. The negligible interference of coexisting ions such as makes the NiAl-LDHs a promising sorbent for fluoride polluted water treatment.
Highlights
Increasing worldwide pollutants of freshwater systems have become one of the key environmental problems facing humanity
The main objectives of this paper were 1) to investigate the structure of NiAl-layered double hydroxides (LDHs) treated by non-thermal plasma (NTP) via X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), and N2 adsorption/desorption, 2) to evaluate the effect of initial pH, contact time and interfering ions on fluoride removal by batch experiments, and 3) to investigate the kinetics of fluoride adsorption by kinetic models
NiAl-LDHs (P) has higher intensity and sharper peaks which compare with the NiAl-LDHs samples, indicating that the application of NTP process promotes the dispersion of hydrotalcites particles
Summary
Increasing worldwide pollutants of freshwater systems have become one of the key environmental problems facing humanity. Fluoride is the most abundant anions present in groundwater worldwide and creates a major problem in safe drinking water supply. Various techniques have been applied to removal of fluoride ion from water. Compared to other techniques such as electrocoagulation [3] [4], reverse osmosis [5], ion exchange [6], membrane techniques [7], and biological treatment [8], adsorption is considered as one of the most promising technologies [9] owing to its cost-effective, versatile, and operational simplicity for the removing trace levers of fluoride anions. To meet the fast-developing water treatment requirements, there is a great need to devise new and innovative technologies and materials for efficient removal of fluoride from aqueous solutions
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