Enhanced fluoride removal from water by non-thermal plasma modified CeO2/Mg–Fe layered double hydroxides
Source abstract
Abstract
Abstract A novel fast and efficient adsorbent based on lamellar compound namely CeO 2 /Mg–Fe layered double hydroxide composite has been designed for fluoride removal from water. In order to improve fluoride removal efficiency, non-thermal plasma (NTP) was used to modify the surface state of composites. The prepared composites were characterized by powder X-ray diffraction, thermogravimetric analysis and surface area analyzer. Adsorption equilibrium and kinetics of fluoride on NTP modified composites were investigated. Experimental results indicated that the adsorption capacity was enhanced with NTP surface modification. The maximum adsorption capacity has been found to be 38.7–60.4 mg/g. The kinetic data of adsorption were found to best fit the pseudo-second-order model, while the equilibrium data were found to be well described by Langmuir model. In order to understand the mechanism of adsorption, thermodynamic parameters such as ΔG θ , ΔS θ and E a were calculated. After NTP treatment, the ΔS θ increased from − 34.7 J/mol·K to − 0.770 J/mol·K, the E a decreased from 78.8 kJ/mol to 58.9 kJ/mol and the ΔG θ (25 °C) decreased from − 2.62 kJ/mol to − 3.14 kJ/mol. These values indicate that the fluoride adsorption on NTP modified composites was improved.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fluoride Effects and Removal · Geochemistry and Elemental Analysis · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
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