AI Article Synopsis
- A La intercalated Li/Al layered double hydroxide (LDH) was developed, showing significantly better fluoride adsorption compared to standard Li/Al-LDH, with a capacity twice as effective and seven times more efficient than activated alumina.
- The fluoride uptake followed a pseudo-second order kinetics model and was described by the Freundlich adsorption isotherm, while the study also examined the impacts of pH and competing ions on fluoride removal.
- The enhanced fluoride adsorption was attributed to the presence of La and Al, with the ability to refresh the adsorbent's capacity using an alkaline solution, suggesting its potential as an effective water treatment method for defluoridation.
Article Abstract
In this study La intercalated Li/Al layered double hydroxide (LDH) was developed for efficient water defluoridation. The La-modified material, i.e., La doped Li/Al-LDH, exhibits more preferable fluoride adsorption than Li/Al-LDH in a broad pH range of 5-9, with the working capacity twice of the latter and seven times of magnitude higher than activated alumina. The fluoride removal kinetics is well fitted by pseudo-second order model, and the adsorption isotherm is well described by Freundlich model. Effect of pH and competing ions was examined during fluoride sequestration. The underlying mechanism for such enhanced adsorption of fluoride by La doped Li/Al-LDH was further revealed based on XPS and FTIR analysis. The presence of La and Al was found to be responsible for the satisfactory defluoridation of La doped Li/Al-LDH, and chloride replacement with fluoride occurred from both LDHs during fluoride adsorption. Also, the capacity of La doped Li/Al-LDH could be refreshed by alkaline solution (pH = 12) for cyclic runs. All the results implied that La doped Li/Al-LDH could serve asa potential adsorbent for efficient fluoride removal from water.
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| http://dx.doi.org/10.1016/j.jcis.2017.09.038 | DOI Listing |
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Enhanced fluoride removal by La-doped Li/Al layered double hydroxides.
J Colloid Interface Sci
January 2018
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, Nanjing 210023, China. Electronic address:
Article Synopsis
- A La intercalated Li/Al layered double hydroxide (LDH) was developed, showing significantly better fluoride adsorption compared to standard Li/Al-LDH, with a capacity twice as effective and seven times more efficient than activated alumina.
- The fluoride uptake followed a pseudo-second order kinetics model and was described by the Freundlich adsorption isotherm, while the study also examined the impacts of pH and competing ions on fluoride removal.
- The enhanced fluoride adsorption was attributed to the presence of La and Al, with the ability to refresh the adsorbent's capacity using an alkaline solution, suggesting its potential as an effective water treatment method for defluoridation.
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