TY - JOUR
T1 - Tetragonal prism shaped Ni-Al bimetallic adsorbent for study of adsorptive removal of fluoride and role of ion-exchange
AU - Raghav, Sapna
AU - Nair, Manjula
AU - Kumar, Dinesh
PY - 2019/12/31
Y1 - 2019/12/31
N2 - Water with high fluoride content is detrimental to health and drinking water quality needs to be closely monitored. Among the various techniques used for fluoride removal, adsorption processes have been found to yield satisfactory results. Herein, Nisingle bondAl adsorbent has been synthesized by a simple co-precipitation method and utilized efficiently for fluoride adsorptive removal studies. The surface properties, functionality, and crystallinity were analyzed by techniques such as FESEM, EDX, TEM, BET, XPS, XRD, and FTIR. XPS and FTIR studies were used to explain the fluoride adsorption mechanism by the hydroxyl group ion-exchange and ion-pair formations. The kinetics of the adsorptive removal process follow the pseudo-second-order and Freundlich isotherm fitted best in the adsorption process. Equilibrium was reached within 16 min, up to the permissible limit >1.5 mg/L. The adsorption process was exothermic, feasible and by physisorption. The excellent adsorption capacity of the adsorbent together with other advantages, such as reusability, easy separation, the absence of interfering ions makes it a suitable adsorbent for the removal of fluoride from water.
AB - Water with high fluoride content is detrimental to health and drinking water quality needs to be closely monitored. Among the various techniques used for fluoride removal, adsorption processes have been found to yield satisfactory results. Herein, Nisingle bondAl adsorbent has been synthesized by a simple co-precipitation method and utilized efficiently for fluoride adsorptive removal studies. The surface properties, functionality, and crystallinity were analyzed by techniques such as FESEM, EDX, TEM, BET, XPS, XRD, and FTIR. XPS and FTIR studies were used to explain the fluoride adsorption mechanism by the hydroxyl group ion-exchange and ion-pair formations. The kinetics of the adsorptive removal process follow the pseudo-second-order and Freundlich isotherm fitted best in the adsorption process. Equilibrium was reached within 16 min, up to the permissible limit >1.5 mg/L. The adsorption process was exothermic, feasible and by physisorption. The excellent adsorption capacity of the adsorbent together with other advantages, such as reusability, easy separation, the absence of interfering ions makes it a suitable adsorbent for the removal of fluoride from water.
KW - Ni-Al@TPS adsorbent
KW - Pseudo-first-order
KW - Synergistic effect
KW - Tetragonal prism shape
KW - Langmuir
U2 - 10.1016/j.apsusc.2019.143785
DO - 10.1016/j.apsusc.2019.143785
M3 - Article
SN - 0169-4332
VL - 498
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 143785
ER -
