By Amita Verma :
THE modest ‘mosambi or sweet lime can now be used to prevent cancer. Researchers at IIT (BHU) claim that the ‘mosambi’ (Citrus limetta) peels can be used to remove heavy metals from water and prevent cancer and other life-threatening ailments. The researchers at the School of Biochemical Engineering, IIT (BHU) have synthesized an eco-friendly and cost-effective adsorbent, which can remove toxic heavy metal ions such as hexavalent chromium from contaminated water and wastewater. Dr Vishal Mishra, associate professor, School of Biochemical Engineering and his student Veer Singh’s study has already been published in the international journal ‘Separation Science and Technology’. Mishra said that the hexavalent chromium is responsible for several types of health problems in humans like cancers, liver and kidney disease and liver malfunctioning, and skin problems.
“This is a new eco-friendly product, synthesized from the Citrus limetta (mosambi) peels biomass. This adsorbent is very effective for removal of hexavalent chromium from waste water compared to other conventional methods and takes less time to separate hexavalent chromium from aqueous solution.” According to Veer Singh, this adsorbent can be easily separated from the aqueous medium after the metal removal process. The researchers have tested the hexavalent chromium removal capacity of this adsorbent in synthetic simulated waste water and have got satisfactory results. The heavy metal removal efficiency of this adsorbent was also tested for other heavy metal ions, such as lead, copper and cadmium, and found emerging heavy metal removal efficiency of this adsorbent.
The heavy metals have carcinogenic properties which cause cancer of all types. Explaining the procedure, he said, “We collect the mosambi peels, dry them, grind them into granules and then modify it with chitosan, a biopolymer. After this, the peels are put in water and they begin to separate the heavy metals.” He said that in developing countries, water-borne diseases are the major problem. According to a United Nations Children’s Fund (UNICEF) assessment, 4,000 children die each day due to the intake of bacterial contaminated water. WHO reports that over 2.6 billion people lack access to clean water, which is responsible for about 2.2 million deaths annually, of which 1.4 million are children.