By coating compact disks in photocatalytic compounds and spinning them to clean water, scientists in Taiwan have found a potential new use for old music CDs. The disks, equipped with tiny zinc oxide nanorods, are able to break down more than 95% of the contaminants in methyl orange dye, a benchmark organic compound for testing photocatalytic reactions.
The amazingly efficient lungs of birds and the swim bladders of fish have become the inspiration for a new filtering system to remove carbon dioxide from electric power station smokestacks before the main greenhouse gas can billow into the atmosphere and contribute to global climate change. A report on the new technology was presented Monday at the 246th National Meeting & Exposition of the American Chemical Society.
In some of this planet’s driest regions, where rainfall is rare or even nonexistent, a few specialized plants and insects have devised ingenious strategies to provide themselves with the water necessary for life: They pull it right out of the air, from fog that drifts in from warm oceans nearby. Now researchers are seeking to mimic that trick on a much larger scale, potentially supplying significant quantities of clean, potable water.
Researchers in Canada have found that abundant materials in the Earth's crust can be used to make inexpensive and easily manufactured nanoparticle-based solar cells. The team has designed nanoparticles that absorb light and conduct electricity from two very common elements: phosphorus and zinc. These are much more plentiful than scarce cadmium, and safer than lead.
Bionic leaves that could produce fuels from nothing more than sunlight, water and carbon dioxide, with no byproducts other than oxygen, represent an ideal alternative to fossil fuels but also pose numerous scientific challenges. In a major advance, researchers at Lawrence Berkeley National Laboratory have developed a method by which molecular hydrogen-producing catalysts can be interfaced with a semiconductor that absorbs visible light.
In the midst of an intensifying global water crisis, scientists are reporting development of a more economical way to use one form of the “ice that burns” to turn very salty wastewater from fracking and other oil and gas production methods into water for drinking and irrigation. The method removes more than 90% of the salt.
The availability of fresh, clean water remains a significant challenge as the world’s population grows. Osmosis is an effective, proven way to accomplish this, but concentrated solutions have presented difficulty. Idaho National Laboratory’s Switchable Polarity Solvents Forward Osmosis (SPS FO) leverages the switching qualities of specialized thermolytic salts to purify water from extremely concentrated solutions.
Four teams of researchers in the United States and the United Kingdom recently were awarded more than $12 million to begin a program of novel research to revolutionize current farming methods by giving crops the ability to thrive without using costly, polluting artificial fertilizers.
In the future, carbon nanomembranes are expected to be able to filter out very fine material or even gases. Right now, basic research is concentrating on methods for the production of these nanomembranes. Using a new process a research team in Germany has produced 12 different carbon nanomembranes from a variety of starting materials.
Lakes and streams are often receiving so much phosphorous that it can pose a threat to the local aquatic environment. Now, research in Denmark shows that an easy and inexpensive solution is available to prevent phosphorus from being discharged to aquatic environments: crushed concrete from demolition sites.
Access to safe drinking water is a step closer to being a reality for those in developing countries, thanks to newly published research. An international team of researchers showed that water purification membranes enhanced by plasma-treated carbon nanotubes are ideal for removing contaminants and brine from water.
All plants need nitrogen to convert into ammonia, but only a small number of plants can fix nitrogen from the atmosphere. The rest are helped by synthetic fertilizers, which have been blamed for nitrogen pollution. A scientist in the U.K., Edward Cocking, has found a specific strain of nitrogen-fixing bacteria in sugar cane which he discovered could intracellularly colonize all major crop plants. The technology is being commercialized.
Scientists are working to reduce the nation's reliance on fossil fuels by developing environmentally friendly and cost effective plastics from natural, sustainable and renewable materials, such as vegetable oils, starches, sugars—even recycled grass clippings. The Univ. of Minnesota’s Center for Sustainable Polymers has recruited more than 25 companies to help develop new materials and those already on the market, like polylactide.
Rice Univ. nanotechnology researchers have unveiled a solar-powered sterilization system that could be a boon for more than 2.5 billion people who lack adequate sanitation. The “solar steam” sterilization system uses nanomaterials to convert as much as 80% of the energy in sunlight into germ-killing heat.
Hydrogenation is a chemical process used in a wide range of industrial applications, from food products to petrochemicals and pharmaceuticals. The process typically involves the use of heavy metals, such as palladium or platinum, which, though efficient, are expensive and can be toxic. However, researchers have discovered way to use iron as a catalyst for hydrogenation.
Many researchers are seeking ways to “scrub” carbon dioxide from the emissions of fossil-fuel power plants as a way of curbing the gas that is considered most responsible for global climate change. Now, researchers have developed a scrubbing system that requires no steam connection, can operate at lower temperatures and would essentially be a “plug-and-play” solution that could be added relatively easily to any existing power plant.
Univ. of Delaware chemist Joel Rosenthal is driven to succeed in the renewable energy arena. Rosenthal and his team have developed an inexpensive catalyst that uses the electricity generated from solar energy to convert carbon dioxide, a major greenhouse gas, into synthetic fuels for powering cars, homes and businesses.
A sliver of wood coated with tin could make a tiny, long-lasting, efficient and environmentally friendly battery. But don’t try it at home yet—the components in the battery tested by scientists at the Univ. of Maryland are a thousand times thinner than a piece of paper. Using sodium instead of lithium makes the battery environmentally benign, but it doesn't store energy as efficiently, so you won’t see this battery in your cell phone.
Among its many talents, silver is an antibiotic. Titanium dioxide is known to glom on to certain heavy metals and pollutants. Other materials do the same for salt. In recent years, environmental engineers have sought to disinfect, depollute, and desalinate contaminated water using nanoscale particles of these active materials. Engineers call them nanoscavengers.
The challenge of making concrete greener—reducing its sizable carbon footprint without compromising performance—is just like the world's most ubiquitous manufactured material—hard! But, according to a new report from NIST, the potential engineering performance, energy-efficiency, and environmental benefits make it a challenge worth tackling.
Every year, millions of tons of environmentally harmful ash is produced worldwide, and is mostly dumped in landfill sites or, in some countries, used as construction material. The ash is what is left when rubbish has been burnt in thermal power stations. A researcher from Lund University in Sweden has now developed a technique to use the ash to produce useful hydrogen gas.
Researchers sponsored by Semiconductor Research Corporation (SRC) have developed a modeling process designed to simulate atomic-level etching with chemicals that are effective alternatives to widely used perfluorocarbon (PFC) gases. The novel approach will identify and evaluate green plasma chemistries for processing emerging memory/logic devices and through-silicon-via (TSV)-enabled technologies for the semiconductor industry.
Chemical companies each year churn out billions of tons of acrylate, a valuable commodity chemical involved in the manufacture of everything from polyester cloth to disposable diapers. It is usually made by heating propylene, a compound derived from crude oil. Researchers at Brown and Yale universities have demonstrated a new “enabling technology” that could instead use excess carbon dioxide to produce acrylate.
For many coastal dwellers, seaweed washed up on the shore is nothing but a nuisance. But this raw material has proven itself capable of keeping buildings well insulated. Washed up on shore, it is generally regarded as a waste product and ends up as landfill. Together with industry partners, researchers in Germany have succeeded in turning it into insulation.
Fat worms confirm that researchers from Michigan State University have successfully engineered a plant with oily leaves—a feat that could enhance biofuel production as well as lead to improved animal feeds. The results show that researchers could use an algae gene involved in oil production to engineer a plant that stores lipids or vegetable oil in its leaves—an uncommon occurrence for most plants.