New research from RMIT University shows that eucalyptus bark, typically considered a waste product, can be repurposed to purify contaminated water, filter polluted air, and capture carbon dioxide.
RMIT researchers demonstrated how eucalyptus bark can be transformed into a highly efficient, porous form of carbon. This material effectively traps pollutants as water or air flows through it. The findings, published in the journal Biomass and Bioenergy, point to a practical method for converting a common forestry byproduct into a valuable environmental material using a relatively simple processing technique.
Porous carbon materials are already widely used in water filters, air purifiers, and industrial gas purification systems. Their effectiveness stems from a network of microscopic pores that capture unwanted molecules as air or water passes through.
How Eucalyptus Bark Becomes a Filter
Researchers successfully converted eucalyptus bark into a highly efficient porous material with strong adsorption capabilities using a relatively simple, one-step activation process. This achievement is significant because many porous carbons are still produced through more complex, multi-step methods that demand additional energy and infrastructure.
Pallavi Saini, the researcher who led the experimental work, noted that the performance of eucalyptus bark was unexpected, given that it is typically viewed as a low-value waste product. “This shows how often overlooked biomass can be transformed into something useful,” Saini said.
Application Prospects in Australia
Dr. Deshetti Jampaya noted that eucalyptus bark offers distinct advantages across several metrics, particularly in Australia, home to over 900 species of eucalyptus and related trees. “The strength of this approach lies in its simplicity: we are converting a widely available waste material into functional carbon with promising performance, without relying on complex processing steps,” Jampaya said, adding that this makes it highly relevant for real-world environmental applications.
For their next step, the researchers plan to collaborate with Indigenous peoples and organizations that possess deep knowledge of eucalyptus species. This partnership aims to help identify which eucalyptus species might be best suited for this type of application. The team believes there is potential to further optimize the material by understanding species-specific chemical and structural characteristics, drawing on both scientific analysis and long-standing ecological knowledge.
Utilizing bark sourced from existing forestry operations does not compete with food production and aligns with the goals of a circular economy and waste reduction. In the future, porous carbon derived from eucalyptus bark could potentially support water purification efforts.
Source: Phys.org
