Researchers at Chalmers University of Technology, Sweden, have developed a brand new biobased materials, a type of powder based mostly on cellulose nanocrystals to purify water from pollution, together with textile dyes. When the polluted water passes by means of the filter with cellulose powder, the pollution are absorbed, and the daylight coming into the remedy system causes them to interrupt down rapidly and effectively. Laboratory assessments have proven that a minimum of 80 % of the dye pollution are eliminated with the brand new methodology and materials, and the researchers see good alternatives to additional improve the diploma of purification. Credit: Chalmers University of Technology, Sweden | David Ljungberg
Researchers at Sweden’s Chalmers University of Technology have provide you with a brand new option to purify contaminated water utilizing cellulose-based supplies. This breakthrough might have a big impression in areas the place water remedy applied sciences are insufficient, and assist deal with the widespread subject of poisonous dye discharge from the textile trade.
Access to wash water is important for our well being and well-being, but it stays a problem for a lot of. The World Health Organization (WHO) experiences that at the moment, over two billion people live with out correct entry to wash water.
This international problem is on the heart of a analysis group at Chalmers University of Technology, which has developed a method to easily remove pollutants from water. The group, led by Gunnar Westman, Associate Professor of Organic Chemistry focuses on new uses for cellulose and wood-based products and is part of the Wallenberg Wood Science Center.
The researchers have built up solid knowledge about cellulose nanocrystals – and this is where the key to water purification lies. These tiny nanoparticles have an outstanding adsorption capacity, which the researchers have now found a way to utilize.
“We have taken a unique holistic approach to these cellulose nanocrystals, examining their properties and potential applications. We have now created a biobased material, a form of cellulose powder with excellent purification properties that we can adapt and modify depending on the types of pollutants to be removed,” says Gunnar Westman.
Absorbs and breaks down toxins
In a study recently published in the scientific journal Industrial & Engineering Chemistry Research, the researchers show how toxic dyes can be filtered out of wastewater using the method and material developed by the group. The research was conducted in collaboration with the Malaviya National Institute of Technology Jaipur in India, where dye pollutants in textile industry wastewater are a widespread problem.
Gunnar Westman, Associate Professor at the Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Sweden. Credit: Chalmers University of Technology
The treatment requires neither pressure nor heat and uses sunlight to catalyze the process. Gunnar Westman likens the method to pouring raspberry juice into a glass with grains of rice, which soak up the juice to make the water transparent again.
“Imagine a simple purification system, like a portable box connected to the sewage pipe. As the contaminated water passes through the cellulose powder filter, the pollutants are absorbed and the sunlight entering the treatment system causes them to break down quickly and efficiently. It is a cost-effective and simple system to set up and use, and we see that it could be of great benefit in countries that currently have poor or non-existent water treatment,” he says.
The method will be tested in India
India is one of the developing countries in Asia with extensive textile production, where large amounts of dyes are released into lakes, rivers, and streams every year. The consequences for humans and the environment are serious. Water contaminant contains dyes and heavy metals and can cause skin damage with direct contact and increase the risk of cancer and organ damage when they enter into the food chain. Additionally, nature is affected in several ways, including the impairment of photosynthesis and plant growth.
Conducting field studies in India is an important next step, and the Chalmers researchers are now supporting their Indian colleagues in their efforts to get some of the country’s small-scale industries to test the method in reality. So far, laboratory tests with industrial water have shown that more than 80 percent of the dye pollutants are removed with the new method, and Gunnar Westman sees good opportunities to further increase the degree of purification.
“Going from discharging completely untreated water to removing 80 percent of the pollutants is a huge improvement, and means significantly less destruction of nature and harm to humans. In addition, by optimizing the pH and treatment time, we see an opportunity to further improve the process so that we can produce both irrigation and drinking water. It would be fantastic if we can help these industries to get a water treatment system that works, so that people in the surrounding area can use the water without risking their health,” he says.
Can be used against other types of pollutants
Gunnar Westman also sees great opportunities to use cellulose nanocrystals for the treatment of other water pollutants than dyes. In a previous study, the research group has shown that pollutants of toxic hexavalent chromium, which is common in wastewater from mining, leather, and metal industries, could be successfully removed with a similar type of cellulose-based material. The group is also exploring how the research area can contribute to the purification of antibiotic residues.
“There is great potential to find good water purification opportunities with this material, and in addition to the basic knowledge we have built up at Chalmers, an important key to success is the collective expertise available at the Wallenberg Wood Science Center,” he says.
References: “Cellulose Nanocrystals Derived from Microcrystalline Cellulose for Selective Removal of Janus Green Azo Dye” by Ruchi Aggarwal, Anjali Kumari Garg, Deepika Saini, Sumit Kumar Sonkar, Amit Kumar Sonker and Gunnar Westman, 26 December 2022, Industrial & Engineering Chemistry Research.
DOI: 10.1021/acs.iecr.2c03365
“Sunlight promoted removal of toxic hexavalent chromium by cellulose derived photoactive carbon dots” by Ruchi Aggarwal, Deepika Saini, Sumit Kumar Sonkar, Amit Kumar Sonker and Gunnar Westman, 17 September 2021, Chemosphere.
DOI: 10.1016/j.chemosphere.2021.132287
The research was funded by the Wallenberg Wood Science Center, WWSC and the Indian group research is funded by Science and Engineering Research Board under Department of Science and Technology (DST-SERB) Government of India.
