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April 27, 2017

Artificial photosynthesis cleans the air & generates renewable energy

The possibility of sustaining world energy needs away from the empire of fossil fuels by tapping into cleaner renewable energies like solar and wind has always looked immensely promising, save for a few roadblocks like cost, storage availability, and the absolute lack of available full-time sunshine or wind.

Sustainability enthusiasts tracking new discoveries for the creation of renewable fuels should be encouraged by this research breakthrough from University of Central Florida chemistry professor, Fernando Uribe-Romo.

As reported by the University of Central Florida, Uribe-Romo has just found a way to trigger the process of photosynthesis in a synthetic material, turning greenhouse gases into clean air and producing energy at the same time:

Researcher Fernando Uribe-Romo subjects his new synthetic material to artificial blue light, which it absorbs and uses to trigger a photosynthesis-like chemical reaction. Photo by the University of Central Florida

“The process has great potential for creating a technology that could significantly reduce greenhouse gases linked to climate change, while also creating a clean way to produce energy.

““This work is a breakthrough,” said UCF Assistant Professor Fernando Uribe-Romo. “Tailoring materials that will absorb a specific color of light is very difficult from the scientific point of view, but from the societal point of view we are contributing to the development of a technology that can help reduce greenhouse gases.”

“Uribe-Romo and his team of students created a way to trigger a chemical reaction in a synthetic material called metal–organic frameworks (MOF) that breaks down carbon dioxide into harmless organic materials. Think of it as an artificial photosynthesis process similar to the way plants convert carbon dioxide (CO2) and sunlight into food. But instead of producing food, Uribe-Romo’s method produces solar fuel.

The following video link features Uribe-Romo explaining the process: click here.

“It’s something scientists around the world have been pursuing for years, but the challenge is finding a way for visible light to trigger the chemical transformation. Ultraviolet rays have enough energy to allow the reaction in common materials such as titanium dioxide, but UVs make up only about 4 percent of the light Earth receives from the sun. The visible range – the violet to red wavelengths – represent the majority of the sun’s rays, but there are few materials that pick up these light colors to create the chemical reaction that transforms CO2 into fuel.

“Researchers have tried it with a variety of materials, but the ones that can absorb visible light tend to be rare and expensive materials such as platinum, rhenium and iridium that make the process cost-prohibitive.

“Uribe-Romo used titanium, a common nontoxic metal, and added organic molecules that act as light-harvesting antennae to see if that configuration would work.  The light harvesting antenna molecules, called N-alkyl-2-aminoterephthalates, can be designed to absorb specific colors of light when incorporated in the MOF. In this case he synchronized it for the color blue.

“His team assembled a blue LED photoreactor to test out the hypothesis. Measured amounts of carbon dioxide were slowly fed into the photoreactor — a glowing blue cylinder that looks like a tanning bed — to see if the reaction would occur. The glowing blue light came from strips of LED lights inside the chamber of the cylinder and mimic the sun’s blue wavelength.

“It worked and the chemical reaction transformed the CO2 into two reduced forms of carbon, formate and formamides (two kinds of solar fuel) and in the process cleaning the air.

““The goal is to continue to fine-tune the approach so we can create greater amounts of reduced carbon so it is more efficient,” Uribe-Romo said.”

The photoreactor resembles a tanning bed, and by feeding measured amounts of carbon dioxide into the glowing cylinder, the team was able to see if the material within kicked off the chemical process(Credit: University of Central Florida)

“He wants to see if the other wavelengths of visible light may also trigger the reaction with adjustments to the synthetic material. If it works, the process could be a significant way to help reduce greenhouse gases.

““The idea would be to set up stations that capture large amounts of CO2, like next to a power plant. The gas would be sucked into the station, go through the process and recycle the greenhouse gases while producing energy that would be put back into the power plant.”

“Perhaps someday homeowners could purchase rooftop shingles made of the material, which would clean the air in their neighborhood while producing energy that could be used to power their homes.

““That would take new technology and infrastructure to happen,” Uribe-Romo said. “But it may be possible.””

While this simply put proposition sounds remarkably logical, if this technology proves to be successful, such a change to this planet’s energy infrastructure will represent a monumental challenge.

Of note, other members of the Uribe-Romo team included UCF graduate student Matt Logan, who is pursuing a PhD in chemistry, and undergraduate student Jeremy Adamson, who is majoring in biomedical sciences. Kenneth Hanson and his research group at Florida State University helped interpret the results of the experiments.

Source & images via University of Central Florida

The findings of his research have been published in the Journal of Materials Chemistry A .

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