1/1/2023 0 Comments Propiedades de los gases![]() ![]() "There have been cases in which workers died of H2S exposure in sewer systems." Professor Bandosz suspects that the coffee-based carbon could also separate out other pollutants from the air and water. "When someone is exposed to high concentrations of H 2S, the nose will stop detecting it," she said. Human noses are so sensitive to the rotten-egg scent of this toxin that it can overwhelm the sense of smell, Professor Bandosz explained. Hydrogen sulfide gas (H2S) isn't just a smelly nuisance for sewage plant neighbors it can be deadly. These densely packed pores are blanketed with nitrogen, perfect to capture hydrogen sulfide molecules passing through. The process of activation fills the carbon with scores of minute holes about 10-30 angstroms in diameter, roughly equivalent to 10-30 hydrogen atom-widths across. To do so, they prepared a slurry of coffee grounds, water and zinc chloride, a chemical "activator." The team then dried and baked the mixture at temperatures of up to 800 degrees Celsius. To make their new filter, Professor Bandosz and her colleagues carbonized old coffee grounds, essentially turning them into charcoal. "All of these," the researchers note, "significantly increase the cost of adsorbents." ![]() Usually, making carbon adsorbents more reactive to toxins requires treating the original with a nitrogen-rich chemical such as ammonia, melamine, or urea, the main nitrogen-containing substance in mammal urine. "We should not neglect the natural biomass that is rich in this element," she and colleagues assert in the January 30 issue of the Journal of Hazardous Materials. ![]() ![]() This element cranks up carbon's ability to clean sulfur from the air, a process called adsorption. But coffee grounds also come equipped with a special ingredient that boosts their smell-fighting power.Ĭaffeine, the stimulant that gives coffee its energy jolt, contains nitrogen. Professor Bandosz realized that our modern coffee culture could supply an abundant source of eco-friendly organic waste. Much like the grains of charcoal packed into the filter of a tabletop water pitcher, her filters use a form of charcoal called "activated carbon."Ĭarbon producers already use materials like coal, wood, peat, fruit pits, and coconut shells to make filters. Teresa Bandosz, CCNY professor of chemistry and chemical engineering develops and tests materials that scrub toxic gases like hydrogen sulfide from air in industrial facilities and pollution control plants. In research to develop a novel, eco-friendly filter to remove toxic gases from the air, scientists at The City College of New York (CCNY) found that a material made from used coffee grounds can sop up hydrogen sulfide gas, the chemical that makes raw sewage stinky.ĭr. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |