Worcester Polytechnic Institute (WPI) researchers have engineered a new carbon-negative building material that actively captures CO2 during production. The novel Enzymatic Structural Material (ESM), detailed by lead scientist Professor Nima Rahbar, uses a natural enzyme to convert carbon dioxide into a solid binder, offering a sustainable and strong alternative to traditional concrete.
Imagine a building brick that doesn’t just have a lower carbon footprint, but actually cleans the air as it’s made. That’s the promise of a groundbreaking new material developed by materials scientists in the United Kingdom. While concrete is the backbone of modern construction, it comes with a staggering environmental cost, contributing nearly 8% of global CO2 emissions. The team at Worcester Polytechnic Institute set out to flip this script, creating a substance that is part construction material, part carbon capture device.
The secret lies in a clever biological process. The material, called Enzymatic Structural Material (ESM), utilizes an enzyme called carbonic anhydrase. This enzyme rapidly converts carbon dioxide and water into carbonic acid. When this acid is mixed with calcium in a matrix of sand, it forms solid particles of calcite (CaCO3)—essentially trapping the CO2 permanently inside the material’s structure. “What our team has developed is a practical, scalable alternative that doesn’t just reduce emissions – it actually captures carbon,” explains Professor Nima Rahbar, senior author of the paper published in Matter.
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The environmental comparison is stark. Producing a single cubic metre of conventional concrete emits approximately 330 kilograms of CO2. In contrast, creating the same volume of ESM sequesters more than 6 kilograms of CO2, resulting in a net-negative carbon process, according to the team’s research published in the journal Matter. Furthermore, ESM can be molded into shapes like roof decks or wall bricks and cures in hours under mild conditions, avoiding the immense energy demands of high-temperature cement kilns.
But a green material is useless if it isn’t strong. The researchers report that ESM has an average compressive strength of 25.8 megapascals (MPa), which exceeds the minimum standard required for structural concrete. It is also durable in water, addressing a key concern for building materials. This combination of strength, simpler curing, and carbon negativity could significantly reduce both labour and environmental costs on construction sites.
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The path forward involves refinement and scaling. The WPI team acknowledges that future work will focus on improving ESM’s mechanical properties and long-term durability to match broader applications. The ultimate goal is to enable large-scale production and potentially develop reinforced versions. “If even a fraction of global construction shifts toward carbon-negative materials like ESM, the impact could be enormous,” Professor Rahbar stated in the journal report. This innovation represents more than a new product; it’s a fundamental reimagining of construction’s role in our environmental ecosystem, turning one of our biggest climate problems into part of the built solution.
