Navigation Links
Organic solvent system may improve catalyst recycling and create new nanomedicine uses

Noble metals such as platinum and palladium are becoming increasingly important because of growth in environmentally friendly applications such as fuel cells and pollution control catalysts. But the world has limited quantities of these materials, meaning manufacturers will have to rely on efficient recycling processes to help meet the demand.

Existing recycling processes use a combination of two inorganic acids known as "aqua regia" to dissolve noble metals, a class of materials that includes platinum, palladium, gold and silver. But because the metals are often dissolved together, impurities introduced in the recycling process may harm the efficiency of catalysts produced from the recycled materials. Now, researchers at the Georgia Institute of Technology have developed a new organic solvent process that may help address the problem and open up new possibilities for using these metals in cancer therapeutics, microelectronics and other applications.

The new Georgia Tech solvent system uses a combination of two chemicals thionyl chloride and a variety of organic reagents such as pyridine, N,N-dimethylformamide (DMF), pyrimidine or imidazole. The concentrations can be adjusted to preferentially dissolve gold or palladium, and more importantly, no combination of the organic chemicals dissolves platinum. This ability to preferentially dissolve noble metals creates a customized system that provides a high level of control over the process.

"We need to be able to selectively dissolve these noble metals to ensure their purity in a variety of important applications," said C.P. Wong, a Regents professor in the Georgia Tech School of Materials Science and Engineering. "Though we don't fully understand how it works yet, we believe this system opens a lot of new possibilities for using these metals."

A paper describing the research was published recently in the journal Angewandte Chemie.

Catalyst systems that make use of more than one metal, such as palladium with a gold core, are becoming more widely used in industrial processes. To recycle those, the new solvent system dubbed "organic aqua regia" could first use a combination of thionyl chloride and DMF to dissolve out the gold, leaving hollow palladium spheres. Then the palladium spheres could be dissolved using a different combination.

So far, the researchers have demonstrated that the solvent system can selectively dissolve gold and palladium from a mixture of gold, palladium and platinum. They have also used it to remove gold from a mixture of gold and palladium.

Beyond recycling, the new solvent system could also provide new ways of producing nanometer-scale cancer chemotherapy agents that involve these metals. And the new solvent approach could have important implications for the electronics industry, which uses noble metals that must often be removed after specific processing steps. Beyond selectivity, the new approach also offers other advantages for electronics manufacturing no potentially harmful contamination is left behind and processing is done under mild conditions.

"In semiconductor production, people want to avoid having a metal catalyst remaining in devices, but in many cases, they cannot use existing water-based processes because these can damage the semiconductor oxides and introduce contamination with free ions in the aqueous solution," explained Wei Lin, a graduate research assistant in Wong's laboratory. "Use of this organic system avoids the problem of moisture."

Use of the selective process could also facilitate recycling of noble metals used in electronics manufacturing. Wire-bonding, metallization and interconnect processes currently use noble metals.

Noble metals are also the foundation for widely-used chemotherapy agents, but the chemistry of synthesizing them involves a complex process of surfactants and precursors. Wong believes the new Georgia Tech solvent process may allow creation of novel compounds that could offer improved therapeutic effects.

"We hope this will open up some new ways of making these important pharmaceutical compounds as well as novel gold and palladium catalytic systems," he said.

Lin discovered the new solvent system by accident in 2007 while using thionyl chloride in an unrelated project that involved bonding carbon nanotubes to a gold substrate. "I left my sample in the solution and went to lunch," he recalled. "Then I received a couple of phone calls and the sample stayed in the solution for too long. When I got it out, the gold was gone."

The researchers were intrigued by the discovery and pursued an explanation as they had time over the past three years. They tested other reagents mixed with the thionyl chloride, and learned the proportions necessary for selective dissolution of palladium and gold. They worked with other researchers at Georgia Tech, including nanotechnology pioneer Zhong Lin Wang, to develop a fundamental understanding of the process research that is continuing.

The chemicals used by the Georgia Tech research team are well known in organic chemistry, and are used today in polymer synthesis. Beyond their selectivity, the new solvent system is more environmentally friendly than traditional aqua regia which is a combination of concentrated nitric and hydrochloric acids and can operate at mild conditions. Potential disadvantages compared to traditional aqua regia include higher costs and slower dissolution rates.

"We have opened up a new approach to noble metals using organic chemistry," Wong added. "We don't yet thoroughly understand the mechanism by which this works, but we hope to develop a more complete understanding that may lead to additional applications."


Contact: John Toon
Georgia Institute of Technology Research News

Related medicine news :

1. Introduces New Line of Organic Herbs, Spices & Seasonings
2. Los Angeles Pool Service Company Pool Joe is Going Organic using Eco-Safe Pool Products
3. Certified Organic Aromatherapy Oils Available from Swanson Health Products
4. Official Alkaline Diet Site Launches Organic Food Store for Healthy Living And Natural Weight Loss
5. Organic Clothing – Is Your Clothing Delivering Death in Small Doses?
6. Russell Organics Launches Certified Organic Rose Hip Oil Product
7. Wild Birds Shun Organic Food
8. Java Planet, Tampa Bay's Newest Organic Coffee Company Announces That it Has Become Fair Trade Certified™
9. Sundial Creations Announces the Debut of SheaMoisture Organic Hair Care Exclusively at Target
10. Make An Immediate Difference On Earth Day - AquaBella Organic Solutions Will Help - As A Gift
11. CLIF BAR Family Foundation Commits $500,000 to Protect and Promote Organic Seed and Farming
Post Your Comments:
Related Image:
Organic solvent system may improve catalyst recycling and create new nanomedicine uses
(Date:11/30/2015)... , ... November 30, 2015 , ... ... at a University of Delaware Accounting and Management of Information Systems course. Based ... for mid-market businesses. Sommer will speak at before student in the Enterprise Resource ...
(Date:11/30/2015)... , ... November 30, 2015 , ... ... continuing education course in Dallas, TX, on January 29 and 30, 2016. The ... improve the functions of their practices, to learn how to better succeed in ...
(Date:11/30/2015)... PA (PRWEB) , ... November 30, 2015 , ... A ... 15th annual Regional Biotech Conference, organized by the Baruch S. Blumberg Institute. , The ... 100 of the area’s life science and biotechnology leaders for the conference, which focused ...
(Date:11/30/2015)... ... November 30, 2015 , ... HemoTreat™ has announced ... its hemorrhoid ointment to its website. , “Our goal is simple:” says Michael ... hemorrhoids. Adding the comparison chart and ingredient list allows our customers to quickly ...
(Date:11/30/2015)... ... November 30, 2015 , ... ChiliPad , Chili ... maximize recovery through quality sleep. Tim DiFrancesco, training coach for the LA Lakers, ... sleep. ChiliPad precisely regulates the surface temperature of each side of the bed ...
Breaking Medicine News(10 mins):
(Date:11/30/2015)... Nov. 30, 2015  PTS Diagnostics, the U.S.-based manufacturer ... analyzers, A1CNow ® systems, and PTS Detect™ ... of patents that will propel the company into the ... Europe . The technology is a ... those on smartphones and tablets, and uses test strip ...
(Date:11/30/2015)... , Nov. 30, 2015 Cumberland Pharmaceuticals (CPIX), ... present live at on December 3, 2015. ... TIME: 3:15p.m. ET LINK: ... LINK: --> ... event where investors are invited to ask the company questions ...
(Date:11/30/2015)... LAKE CITY , Nov. 30, 2015 Booth ... (NYSE: VAR ) will exhibit a broader array of ... of the Radiological Society of North America ... Varian exhibit at the meeting will feature X-ray components "At ... CT tube, a line of products from Varian,s Claymount brand, ...
Breaking Medicine Technology: