Could Concrete Help Solve the Problem of Air Pollution?
Study indicates concrete construction waste can help rid the air of sulfur dioxide, a major pollutant
This electron microscopy image of concrete includes a model of sulfur dioxide interactions with concrete surface – represented by the colored spheres.
Credit: Marija Illoska
STONY BROOK, N.Y., July 7, 2017 – New research reveals that sulfur dioxide, a major contributor to air pollution, is removed from the air by concrete surfaces. Stony Brook University researcher Alex Orlov, PhD, and colleagues discovered how concrete interacts and eliminates sulfur and nitrogen oxides. Their findings, published in the July edition of the Journal of Chemical Engineering, could be a significant step toward the practice of using waste concrete to minimize air pollution.
According to the World Health Organization, as many as seven million premature deaths of people worldwide may be linked to poor air quality and pollution. Sulfur dioxide emissions are among the most common pollutants into the air globally, with power plants emitting the most sulfur dioxide. Cement kilns also produce approximately 20 percent of all sulfur dioxide industrial emissions.
"Even though producing concrete causes air pollution, concrete buildings in urban areas can serve as a kind of sponge adsorbing sulfur dioxide to a high level," explained Dr. Orlov, Associate Professor of Materials Science and Chemical Engineering in the College of Engineering and Applied Sciences, and a faculty member of the Consortium for Inter-Disciplinary Environmental Research at Stony Brook University. "Our findings open up the possibility that waste concrete coming from building demolitions can be used to adsorb these pollutants."
He added that concrete remains the most widely used material in the world and is inexpensive. Because of this, Dr. Orlov emphasized that "the strategy of using pollution causing material and turning it into an environmental solution could lead to new thinking in urban design and waste management."
Dr. Orlov cautioned that the capacity for concrete to adsorb pollutants diminishes over time as the material ages. Crushing concrete, however, can expose new surfaces and restore its pollution removing properties.
The researchers used various cement and cement-based building materials to conduct their experiments, details of which are in the paper, titled "Reactions of SO2 on hydrated cement particle system for atmospheric pollution reduction: A DRIFTS and XANES study." They employed Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and X-ray absorption Near Edge Spectroscopy (XANES) to identify the levels of sulfur dioxide adsorption on the materials.
Experiments were conducted at Stony Brook University, Brookhaven National Laboratory's National Synchrotron Light Source and Center for Functional Nanomaterials, and the National University of Singapore.
Co-authors on the paper are Girish Ramakrishnan and Qiyuan Wu of Stony Brook University, and Juhyuk Moon at the National University of Singapore.
The research in part was supported by the National Science Foundation CMMI program.
About Stony Brook University
Stony Brook University is going beyond the expectations of what today's public universities can accomplish. Since its founding in 1957, this young university has grown to become one of only four University Center campuses in the State University of New York (SUNY) system with more than 25,700 students, 2,500 faculty members, and 18 NCAA Division I athletic programs. Our faculty have earned numerous prestigious awards, including the Nobel Prize, Pulitzer Prize, Indianapolis Prize for animal conservation, Abel Prize and the inaugural Breakthrough Prize in Mathematics. The University offers students an elite education with an outstanding return on investment: U.S. News & World Report ranks Stony Brook among the top 40 public universities in the nation. Its membership in the Association of American Universities (AAU) places Stony Brook among the top 62 research institutions in North America. As part of the management team of Brookhaven National Laboratory, the University joins a prestigious group of universities that have a role in running federal R&D labs. Stony Brook University is a driving force in the region's economy, generating nearly 60,000 jobs and an annual economic impact of $4.65 billion. Our state, country and world demand ambitious ideas, imaginative solutions and exceptional leadership to forge a better future for all. The students, alumni, researchers and faculty of Stony Brook University are prepared to meet this challenge.