latest news: Water Treatment
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Equilibrium sorption of fluoride on the activated alumina in aqueous solution.
Removal of fluoride is a desalination technology in which fluoride ions from aqueous solution are adsorbed on suitable adsorbent surfaces. In this study, adsorption potential was performed on both activated alumina (AA) and grinded activated alumina (GAA) by batch experiments for different contact time, pH, fluoride concentration, and adsorbent dose. Results indicated that adsorption occurred […]International Water Treatment
Review of fluoride removal from water environment by adsorption.
Highlights Recent developments in fluoride removal from water by adsorption are reviewed. Four technical strategies are proposed for designing of adsorbents. Transfering the adsorption process to industrial scale is urgently needed. Fluoride adsorption and desorption in field condition need further investigation. Abstract Fluoride contamination in water environment due to natural and artificial activities has been […]International Water Treatment
Smartphone-based Fluoride-specific Sensor for Rapid and Affordable Colorimetric Detection and Precise Quantification at Sub-ppm Levels for Field Applications
*Read the full article online at https://pubs.acs.org/doi/10.1021/acsomega.0c03465 *Read the full article in pdf at http://fluoridealert.org/wp-content/uploads/mukherjee-2020.pdf Abstract Higher levels of fluoride (F–) in groundwater constitute a severe problem that affects more than 200 million people spread over 25 countries. It is essential not only to detect but also to accurately quantify aqueous F– to ensure safety. […]International Water Treatment
Experimental and modeling studies for adsorbing different species of fluoride using lanthanum-aluminum perovskite.
Highlights The hollow Lanthanum-aluminum perovskite was first applied to remove fluoride. The species of F–, HF, HF2– played a more important role at different pH. The Lanthanum sites had more important effect than Aluminum at higher pH. Higher concentrations of fluoride required more Aluminum than Lanthanum sites. Abstract We investigated the adsorption mechanisms for removing […]International Water Treatment
cRemoval of fluoride from water using activated carbon fibres modified with zirconium by a drop-coating method
Highlights Drop-coating yielded a 5.5 times higher fluoride adsorption capacity than soaking. Effects of complexing agent (oxalic acid) and Zr/ACF mass ratio were studied. Hydroxyl groups played a key role in Zr(IV) anchoring and fluoride adsorption. Ion exchange and electrostatic attraction are adsorption mechanisms at different pH. The maximum fluoride adsorption capacity of Zr-ACF was […]China Water Treatment
Iron oxide nanoparticles modified with ionic liquid as an efficient adsorbent for fluoride removal from groundwater
Highlights IL-iron oxide NPs acts as an excellent adsorbent for fluoride adsorption since its ion pair attraction with the F–. Fluoride adsorption efficiency was achieved 96% in 30 min by IL-iron oxide NPs. Fluoride removal parameters on IL-iron oxide NPs have been optimized. Regeneration study showed 65% removal efficiency till 5th red Cycle. Abstract A […]International Water Treatment
Remediation of fluoride contaminated water using encapsulated active growing algae
Highlights 60 % of fluoride was removed from 3 mg/L concentration using encapsulated living and growing algae. SEM- EDX and FTIR studies confirmed the biosorption of fluoride on algae. Bigger scale implementation of the concept is possible due to very simple separation operation of algae from treated water. Freundlich isotherm and first-order kinetics were fitted […]International Water Treatment
Fluoride removal from groundwater using Zirconium Impregnated Anion Exchange Resin.
Highlights HAIX-Zr resin selectively removes fluoride and can be easily regenerated. HAIX-Zr resin shows higher defluoridation capacity than commonly used adsorbents. The presence of bicarbonate adversely affects fluoride removal by HAIX-Zr. Exchange of OH– with F– is the possible fluoride removal mechanism by HAIX-Zr. Abstract Drinking water containing excess fluoride is a major health concern […]International Water Treatment
Bio-inspired materials for defluoridation of water: A review
Abstract The polluted water sources pose a serious issue concerning the various health hazards they bring along. Due to various uncontrolled anthropogenic and industrial activities, a great number of pollutants have gained entry into the water systems. Among all the emerging contaminants, anionic species such as fluoride cause a major role in polluting the water […]International Water Treatment
Modified Crushed Oyster Shells for Fluoride Removal from Water
Abstract Elevated concentrations of fluoride ions (F–) in natural groundwater are a worldwide problem. Discarded oyster shells were ground to <100 µm particle size to produce oyster shell powder (OS). A subset of the OS was heated to produce calcined oyster shell (COS). A subset of the COS was further treated with 1 M phosphoric […]China Water Treatment