PMID- 35985389
OWN - NLM
STAT- MEDLINE
DCOM- 20220929
LR  - 20220929
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 307
IP  - Pt 3
DP  - 2022 Nov
TI  - Performance and mechanism of lanthanum-modified zeolite as a highly efficient 
      adsorbent for fluoride removal from water.
PG  - 136063
LID - S0045-6535(22)02556-5 [pii]
LID - 10.1016/j.chemosphere.2022.136063 [doi]
AB  - Defluoridation of water is still challenging due to the fluoride pollution of 
      both groundwater and surface water worldwide. In this study, lanthanum-modified 
      zeolite (LMZ) was synthesized from coal fly ash and was investigated for fluoride 
      removal from water by conducting batch and column experiments. Our results 
      indicated that the process of fluoride adsorption was endothermic and the 
      adsorption kinetics on LMZ followed the pseudo-second-order model. A higher 
      temperature increased both the capacity and the rate of adsorption. The maximum 
      fluoride adsorption capacity of LMZ reached 141.5 mg/g with a F/La molar ratio of 
      4.21, as estimated from the Langmuir model which best fitted the isotherm data. 
      Fluoride adsorption greatly depended on pH, with optimal performance being 
      achieved within  approximately 5.0- approximately 7.0. The point of zero charge of LMZ was pH 8.8, at which 
      only bicarbonate ions greatly affected fluoride removal. However, no competing 
      effect was observed at pH 6.3 for all tested anions including chloride, sulphate, 
      nitrate, bicarbonate and acetate. The dominant adsorption mechanism was the 
      ligand exchange of fluoride with hydroxyls on LMZ, as illustrated by the rise in 
      pH due to fluoride adsorption and by the molecular scale spectroscopic FTIR, 
      Raman and XPS studies. Fluoride adsorbed on LMZ was successfully desorbed using 
      NaOH solution, and regenerated LMZ could be reused. The results of column studies 
      showed that LMZ granulated with alginate performed well in treating 
      F(-)-containing water. In conclusion, LMZ is a promising material for efficient 
      defluoridation from water.
CI  - Copyright (c) 2022 Elsevier Ltd. All rights reserved.
FAU - Yang, Renjie
AU  - Yang R
AD  - School of Environmental Science and Engineering, Shanghai Jiao Tong University, 
      No. 800, Dongchuan Road, Shanghai, 200240, China.
FAU - Chen, Jiabin
AU  - Chen J
AD  - School of Environmental Science and Engineering, Shanghai Jiao Tong University, 
      No. 800, Dongchuan Road, Shanghai, 200240, China.
FAU - Zhang, Zhiyong
AU  - Zhang Z
AD  - School of Environmental Science and Engineering, Shanghai Jiao Tong University, 
      No. 800, Dongchuan Road, Shanghai, 200240, China.
FAU - Wu, Deyi
AU  - Wu D
AD  - School of Environmental Science and Engineering, Shanghai Jiao Tong University, 
      No. 800, Dongchuan Road, Shanghai, 200240, China. Electronic address: 
      dywu@sjtu.edu.cn.
LA  - eng
PT  - Journal Article
DEP - 20220816
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Alginates)
RN  - 0 (Bicarbonates)
RN  - 0 (Chlorides)
RN  - 0 (Coal)
RN  - 0 (Coal Ash)
RN  - 0 (Ligands)
RN  - 0 (Nitrates)
RN  - 0 (Sulfates)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
RN  - 1318-02-1 (Zeolites)
RN  - 55X04QC32I (Sodium Hydroxide)
RN  - 6I3K30563S (Lanthanum)
RN  - Q80VPU408O (Fluorides)
SB  - IM
MH  - Adsorption
MH  - Alginates
MH  - Bicarbonates
MH  - Chlorides
MH  - Coal
MH  - Coal Ash
MH  - Fluorides/chemistry
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Lanthanum/chemistry
MH  - Ligands
MH  - Nitrates
MH  - Sodium Hydroxide
MH  - Sulfates
MH  - Water
MH  - *Water Pollutants, Chemical/analysis
MH  - *Water Purification/methods
MH  - *Zeolites
OTO - NOTNLM
OT  - Adsorption
OT  - Coal fly ash
OT  - Fluoride
OT  - Mechanism
OT  - Zeolite
OT  - pH
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2022/08/20 06:00
MHDA- 2022/09/30 06:00
CRDT- 2022/08/19 19:23
PHST- 2022/05/26 00:00 [received]
PHST- 2022/08/05 00:00 [revised]
PHST- 2022/08/09 00:00 [accepted]
PHST- 2022/08/20 06:00 [pubmed]
PHST- 2022/09/30 06:00 [medline]
PHST- 2022/08/19 19:23 [entrez]
AID - S0045-6535(22)02556-5 [pii]
AID - 10.1016/j.chemosphere.2022.136063 [doi]
PST - ppublish
SO  - Chemosphere. 2022 Nov;307(Pt 3):136063. doi: 10.1016/j.chemosphere.2022.136063. 
      Epub 2022 Aug 16.