Facile method to synthesize efficient adsorbent from alumina by nitric acid activation: Batch scale defluoridation, kinetics, isotherm studies and implementation on industrial wastewater treatment

Journal of Hazardous Materials
Usha KumariB C Meikap

Abstract

The excess amount of fluoride contamination in the groundwater or industrial effluents fosters various health problems. Considering the advantages of adsorption, the current research reports the synthesis of a novel adsorbent (HNAA) by simple and convenient process of nitric acid activation of alumina. The physiochemical characterization (SEM, EDX, XRF, FTIR, BET, and pHZPC) results exhibited successful activation of alumina and adsorption of fluoride ions. The effect of process parameters (contact time, initial pH, adsorbent dose, initial fluoride concentration and presence of coexisting ions) on adsorption of fluoride ions on HNAA were investigated in batch scale. The adsorption of fluoride ion on HNAA followed the Freundlich isotherm and pseudo second order kinetic model. The Qmax of HNAA adsorbent was 45.75 mg/g at 45 °C. The fluoride ion adsorption was revealed to be endothermic and spontaneous. The experimentation of the HNAA adsorbent on industrial wastewater, with fluoride concentration of 17.5 mg/L, inferred the significant defluoridation potential at the optimized adsorbent dose and pH. The nitric acid activation of alumina resulted in improvement of defluoridation efficiency from 74.18% to 97.43%. The HNAA also exhib...Continue Reading

Citations

Oct 4, 2020·Environmental Science and Pollution Research International·Lei HuangHaiying Wang
Mar 7, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wondwosen Sime GeletaBernd Lennartz
Nov 24, 2019·Journal of Colloid and Interface Science·Jui-Yen LinC P Huang
Jul 31, 2021·Journal of Hazardous Materials·Zihong ChenWeixin Li

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