TY - JOUR
T1 - Adsorptive removal of fluoride using biochar – A potential application in drinking water treatment
AU - Sadhu, Mohini
AU - Bhattacharya, Prosun
AU - Vithanage, Meththika
AU - Padmaja Sudhakar, Pamidimukkala
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - Fluoride as a geogenic contaminant is commonly encountered in groundwater-based drinking water sources. In the present study Watermelon Rind (Citrullus lanatus) Biochar (WMRBC) was investigated for its defluoridation potential. The factors affecting the removal of fluoride, including pH, adsorbent dosage, initial concentration, and contact time were investigated. The experimental data were fitted well by Freundlich isotherm and pseudo-second-order model, the maximum fluoride adsorption capacity being 9.5 mg/g. Thermodynamic parameters indicated that the fluoride adsorption process was a spontaneous exothermic process. The presence of other anions like HCO3–, CO32–, Cl−, SO42−, and NO3– (100 mg/L) had little effect on the adsorption of fluoride at 50 mg/L. Characterization studies of WMRBC before and after fluoride adsorption by SEM, ATR, EDX and XRD techniques, indicated that the adsorption of fluoride may be by electrostatic attraction through protonated basic functionalities present in WMRBC and by precipitation at the mineral sites. WMRBC could be a viable adsorbent for effective removal of fluoride from drinking water and industrial wastewater.
AB - Fluoride as a geogenic contaminant is commonly encountered in groundwater-based drinking water sources. In the present study Watermelon Rind (Citrullus lanatus) Biochar (WMRBC) was investigated for its defluoridation potential. The factors affecting the removal of fluoride, including pH, adsorbent dosage, initial concentration, and contact time were investigated. The experimental data were fitted well by Freundlich isotherm and pseudo-second-order model, the maximum fluoride adsorption capacity being 9.5 mg/g. Thermodynamic parameters indicated that the fluoride adsorption process was a spontaneous exothermic process. The presence of other anions like HCO3–, CO32–, Cl−, SO42−, and NO3– (100 mg/L) had little effect on the adsorption of fluoride at 50 mg/L. Characterization studies of WMRBC before and after fluoride adsorption by SEM, ATR, EDX and XRD techniques, indicated that the adsorption of fluoride may be by electrostatic attraction through protonated basic functionalities present in WMRBC and by precipitation at the mineral sites. WMRBC could be a viable adsorbent for effective removal of fluoride from drinking water and industrial wastewater.
KW - Adsorption
KW - Fluoride
KW - Groundwater
KW - Industrial wastewater
KW - Watermelon rind biochar
UR - http://www.scopus.com/inward/record.url?scp=85114491534&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2021.119106
DO - 10.1016/j.seppur.2021.119106
M3 - Article
AN - SCOPUS:85114491534
SN - 1383-5866
VL - 278
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 119106
ER -