Highlights
- Green synthesized iron-aluminium nanocomposite, adsorption capacity ?42.95?mg/g and fluoride removal 82.1%.
- Langmuir model best fitted the equilibrium data with monolayer adsorption capacity of 28.07?mg/g at 313?K.
- The reaction followed pseudo second order kinetics and multistage diffusion control process.
- Fluoride contaminated water from subparts of India resulted in 82.6 and 83% removal efficiency.
Abstract
A novel green synthesized iron-aluminum nanocomposite was prepared and characterized by FESEM, FTIR, EDX, XRD, BET, DSC and TGA analysis. The clove extract acting as both reducing and surface coating agent was optimized based on its maximum total flavonoid content (TFC) and total polyphenolic content (TPC). Fluoride adsorption studies was performed at 298K, 303K and 313K within the range of 10–40?mg/L fluoride solution for kinetic and isotherm studies. Maximum adsorption capacity of 42.95?mg/g was obtained for 0.25?g/L adsorbent dosage. Moreover fluoride adsorption obeyed pseudo second order kinetic model whereas the process was multistage diffusion controlled. Langmuir isotherm model best fitted the equilibrium data with monolayer adsorption capacities of 25.09, 26.08 and 28.07?mg/g at 298, 303 and 313K respectively. The findings confirmed that the fluoride adsorption process followed ion exchange mechanism with the surface hydroxyl groups. The prepared nanocomposite was utilized for treating fluoride contaminated water samples from north-east regions of India which showed efficient removal percentage.
Graphical abstract
*Original abstract online at https://www.sciencedirect.com/science/article/pii/S0045653519314304
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