https://eprints.lancs.ac.uk/id/eprint/166548/1/Baskar_STOTEN_Adsorbent_Preprint.pdf

Recovery, regeneration and sustainable management of spent adsorbents from wastewater treatment streams: A review.

Removal of fluoride from industrial wastewater by using different adsorbents: A review.

Fluoride contamination in water environment due to natural and artificial activities has been recognized as one of the major problems worldwide. Developing effective and robust technologies for excess fluoride removal from water environment becomes highly important. Among the commonly used treatment technologies applied for fluoride removal, adsorption technique has been explored widely and offers a highly efficient simple and low-cost process for fluoride removal from water. This review reports the recent developments in fluoride removal from water environment by adsorption methods. Studies on fluoride removal from aqueous solutions using various carbon materials are reviewed. It is evident that various adsorbents with high fluoride removal capacity have been developed, however, there is still an urgent need to transfer the removal process to industrial scale. Regeneration studies need to be performed in more extent to recover the adsorbent in field conditions, enhancing the economic feasibility of the process. Based on the review, four technical strategies of adsorption method including nano-surface effect, structural memory effect, anti-competitive adsorption and ionic sieve effect can be proposed. The design of adsorbents through these four strategies can greatly improve the removal efficiency of fluoride in water and provide guidance for the development of new efficient methods for fluoride removal in the future.

Review of fluoride removal from water environment by adsorption

In-situ fabrication of a spherical-shaped Zn-Al hydrotalcite with BiOCl and study on its enhanced photocatalytic mechanism for perfluorooctanoic acid removal performed with a response surface methodology

In the current investigation, the adsorptive performance of hydroxyapatite (HAp) was improved by using Fe3O4 magnetic nanoparticles and polydopamine (PDA) and was applied to eliminate Hg(II), Co(II), and Ni(II). The tests of XPS, XRD, EDX, FTIR, TGA, and VSM were applied to identify the HAp/Fe3O4/PDA structure and adsorption mechanisms. Based on the finding, pH was of the most effective variables in the elimination process and the highest yield was determined at pH 6 for all studied metals. The equilibrium data followed the Langmuir and Freundlich models (R2 > 0.9). According to isotherm modeling, Hg(II), Co(II), and Ni(II) removal using HAp/Fe3O4/PDA has a physical mechanism. The highest elimination capacity (qm) for Hg(II), Co(II), and Ni(II) was set at 51.73 mg/g, 49.32 mg/g, and 48.09 mg/g, respectively. The effect of contact time had a good consistency with the findings of the Weber and Morris kinetic, as the process was done in two steps. The Gibbs free energy parameter revealed that the abatement process is spontaneous and its spontaneity degree decreases with elevating temperature. Various analyzes were used to explore the characteristics of the HAp/Fe3O4/PDA composite. In summary, HAp/Fe3O4/PDA had an effective capability to remove toxic metals from distilled water and landfill leachate.

Ming Gao

Papers

Efficient removal of fluoride from aqueous solutions using 3D flower-like hierarchical zinc-magnesium-aluminum ternary oxide microspheres

Hydrothermal synthesis of hierarchical hollow hydroxyapatite microspheres with excellent fluoride adsorption property

Self-propagating synthesis of Zn-loaded biochar for tetracycline elimination.

Hierarchical hollow manganese-magnesium-aluminum ternary metal oxide for fluoride elimination.

A series of novel carbohydrate-based carbon adsorbents were synthesized by self-propagating combustion for tetracycline removal.