Fluoride occurrences, health problems, detection, and remediation methods for drinking water: A comprehensive review.

Fluoride occurrences, health problems, detection, and remediation methods for drinking water: A comprehensive review

Potential of a novel facultative anaerobic denitrifying Cupriavidus sp. W12 to remove fluoride and calcium through calcium bioprecipitation.

This work investigated the triggering mechanism of peroxymonosulfate (PMS) activated by an oxygen vacancy (Ov)-rich cobalt (Co)-based hydrotalcite-like compound (CA-LDH). CA-LDH was synthesized by a urea-hydrothermal process with ammonium citrate (CA) as the reducing agent. The PMS activation mechanism was investigated by combining batch experiments, characterization techniques, and DFT calculations. Over 98 % of CIP (20 mg/L) was degraded by the CA-LDH/PMS system within 60 min, which remained efficient in the presence of common interfering substances or over a wide pH range. DFT showed that CA was beneficial for introducing the electron transfer intermediate, namely, Ov, on CA-LDH, thereby allowing for the unique electron transfer performance of CA-LDH. Specifically, electron transfer from Co-Ov to PMS triggered the radical pathway, while electron transfer from PMS to Co-Ov triggered the nonradical pathway. Overall, this study provides a reference for the rational catalyst synthesis and the investigation of the triggering mechanism of PMS activation. 

Citrate-regulated synthesis of hydrotalcite-like compounds as peroxymonosulfate activator - Investigation of oxygen vacancies and degradation pathways by combining DFT

Enhanced catalytic degradation of aqueous doxycycline (DOX) in Mg-Fe-LDH@biochar composite-activated peroxymonosulfate system: Performances, degradation pathways, mechanisms and environmental implications

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.

Ya Yang

Papers

Review of fluoride removal from water environment by adsorption

Efficient generation of singlet oxygen (1O2) by hollow amorphous Co/C composites for selective degradation of oxytetracycline via Fenton-like process