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Miners, smelters still divided on copper processing charges
Excerpt: “However, a third source involved in the talks said the problem for Freeport is that Grasberg’s concentrate will risk exceeding the maximum permitted fluorine content of 1,000 parts per million, or 0.1%, in top copper consumer China.” FILE PHOTO: Truck is seen on a road in the Grasberg copper and gold mine operated by […]International Copper Smelter
No promising antidote 25 years after the Tokyo subway sarin attack: A review.
Note from FAN: The molecular structure of Sarin: Highlights This year marks 25 years since the Tokyo subway sarin attack. 2-PAM is the most widely used antidote in hospitals despite poor BBB permeability. We are trying to develop a reactivator that can easily cross the BBB. There are still no promising oximes that are safe, […]International Chemical Weapons
Using sunlight to transform chemical manufacturing into ‘zero-waste’ industries
Chemical engineers have successfully manipulated carbon nitride to use sunlight to synthesize fluorine-based molecules, which are key building blocks of pharmaceutical products in a breakthrough on the path to the ‘holy grail’ of zero waste industry manufacturing. Researchers from The University of Manchester have discovered that simple manipulations of carbon nitride, a metal-free, non-toxic solid, […]International Pharmaceuticals
Activation of pentafluoropropane isomers at a nanoscopic aluminum chlorofluoride: hydrodefluorination versus dehydrofluorination
Abstract The hydrofluorocarbon 245 isomers, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,2- pentafluoropropane, and 1,1,1,2,3-pentafluoropropane (HFC-245fa, HFC-245cb, and HFC-245eb) were activated through C–F bond activations using aluminium chlorofluoride (ACF) as a catalyst. The addition of the hydrogen source Et3SiH is necessary for the activation of the secondary and tertiary C–F bonds. Multiple C–F bond activations such as hydrodefluorinations and dehydrofluorinations […]International Greenhouse/Ozone Gases
The ban on the use of fluoride in biathlon will come into force from the season-2021/22
The ban on the use of fluoride in biathlon and cross-country skiing will come into force from the 2021/22 season, reports TASS citing the International Biathlon Union (IBU) and the International Ski Federation (FIS). It is noted that the start date of the ban was decided to be postponed to the season due to the […]International
Breast milk analysis detects both legacy and emerging fluorinated compounds
Scientists have analysed breast milk from women living in cities in China and Sweden to check for 20 per- and polyfluoroalkyl substances (PFASs). The study detected significant levels of legacy PFASs and alternatives to those older PFASs, and is one of the first studies to detect 9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid (F53-B) and 3H-Perfluoro-3-[(3-methoxy-propoxy)propanoic acid] (ADONA) in human […]International Perfluorinated chemicals
Fluoride containing water: A global perspective and a pursuit to sustainable water defluoridation management -an overview.
Highlights Fluoride level in natural waters can be exceedingly high reaching 2800 ppm F–. Contaminated water and diseases caused by fluoride are prevalent worldwide. Recent fluoride removal studies are mostly on the bench-scale phase. Investigated techniques usually omit high F– concentration wastewater (>100 ppm). Life cycle assessment and cost evaluation for defluoridation are deemed vital. […]International Water Treatment
Thermally treated Mytilus coruscus shells for fluoride removal and their adsorption mechanism.
Highlights Calcination increases fluoride adsorption capacity of Mytilus coruscus shells. An increase of calcination temperature from 700 °C to 800 °C increases fluoride removal sharply. The maximum fluoride adsorption capacity of MCS-800 is 82.93 mg/g. Fluoride removal by MCS-800 is achieved via precipitation by forming CaF2. Abstract We evaluated Mytilus coruscus shells (MCS) as an […]International Water Treatment
Effective electrochemically controlled removal of fluoride ions using electrodeposited polyaniline-carbon nanotube composite electrodes.
Highlights PANI was electrodeposited onto a CNT-based substrate. PANI was in the partially oxidized emeraldine form and could participate in redox reactions. The PANI-CNTs composite is a promising redox-active electrode material. Enhanced fluoride removal was achieved by electrochemically controlled separation. The selectivity of fluoride over chloride was significantly enhanced. Abstract The objective of this study […]International Water Treatment
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