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Researchers at the National Institute of Technology (NIT) Rourkela have turned discarded jackfruit peel into a zirconium-modified activated-carbon adsorbent that removed more than 90% of fluoride from water in laboratory tests. The reported result applies to test solutions containing about 1–5 milligrams of fluoride per litre, with treatment taking roughly 10–20 minutes.
The approach could eventually provide a waste-derived option for fluoride treatment, but it is not yet a household filter or a commercially available product. The work is reported at Technology Readiness Level 4, meaning it has been validated in the laboratory and still needs prototype and field testing.
What NIT Rourkela developed
The team, associated with Professor Susmita Mishra of NIT Rourkela’s Department of Chemical Engineering and research graduate Dr Pratima Minz, starts with discarded jackfruit peel. That agricultural waste is converted into activated carbon, then modified with zirconium. The resulting material is intended to capture fluoride when contaminated water comes into contact with it.
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Activated carbon provides a porous solid surface for adsorption. In this project, zirconium modification was used to improve the carbon’s ability to capture fluoride. The published reports describe the feedstock and modification route, but do not establish a complete consumer-device design, a required dose for household treatment or a field operating procedure.
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“The key idea behind this technology is to use an agricultural waste material as a resource for water purification. We prepared activated carbon from discarded jackfruit peel and modified it with zirconium to improve its ability to capture fluoride from water. The material showed promising results in laboratory tests, removing over 90% of fluoride within approximately 10 minutes under the tested conditions.”
— Susmita Mishra, professor, NIT Rourkela Department of Chemical Engineering
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How much fluoride did it remove?
The reported performance is a laboratory result, not a guarantee for every groundwater source. Across the conditions described in the reports, fluoride removal was approximately 90–97% within 10–20 minutes.
| Measure | Reported result | Qualification |
|---|---|---|
| Fluoride concentration in test water | Approximately 1–5 mg/L | Laboratory test range reported for the material |
| Fluoride removal | About 90–97% | Observed under the reported test conditions |
| Contact time | 10–20 minutes | Time used in the laboratory tests |
| Headline result | More than 90% removal in about 10 minutes | Summary of the team’s reported laboratory finding |
Those numbers do not by themselves show how many litres a given quantity of material can treat, how performance changes as the carbon fills with fluoride, or whether the treated water meets a particular national drinking-water standard. The reports do not provide those operating figures.
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What the reported cost means
NIT Rourkela researchers estimated synthesis at approximately ₹37 per gram, based on electricity and chemical inputs. That is an estimate for making the material, reported in 2026; it is not the price of a filter, the cost per litre of treated water or the total cost of a household system.
A delivered-water calculation would also need the adsorbent mass required per litre, contactor or cartridge design, labour, testing, replacement frequency, waste handling and distribution. None of those values has been established in the cited reports, so the ₹37-per-gram figure cannot be converted responsibly into a household treatment price.
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Why the material is not yet a consumer filter
The work is described as Technology Readiness Level 4 (TRL-4). At this level, the material and its performance have been demonstrated in a controlled laboratory setting; a field-ready product has not been proven.
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- A physical prototype of the treatment system.
- Long-term performance testing.
- Assessment of deployment feasibility and operating costs.
Important evidence that is still missing
- Durability during continuous or repeated use.
- Adsorption capacity and the point at which the material must be replaced.
- Whether the material can be regenerated, and how regeneration waste would be managed.
- Effects of competing ions and the broader chemistry of real groundwater.
- Verified treatment flow rates and finished-water quality in field conditions.
- A retail cartridge, appliance or other finished product.
Because these data are not yet reported, a generic activated-carbon filter or fluoride test kit should not be presented as containing the NIT Rourkela material.
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Patent and research context
Reports identify a patent application numbered 202531080242, dated August 25, 2025. A patent application signals that protection has been sought; it does not mean the invention has completed product certification, entered commercial manufacture or become available to consumers.
NIT Rourkela repository material also records earlier work by Minz and Mishra on zinc-chloride-impregnated jackfruit-peel activated carbon for dye removal. That research helps explain the material-development pathway, but dye-removal results are not evidence of fluoride-removal performance. The fluoride figures come from the newer zirconium-modified material’s reported tests.
What this means for households and water projects
For a household facing suspected fluoride contamination, the practical first step remains measuring the source water with a properly selected laboratory or certified test service. Fluoride levels can vary between wells and over time, and the NIT material has not yet been validated across those conditions.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWater utilities, researchers and potential pilot partners would need to establish a complete treatment train before deployment: influent testing, a specified adsorbent dose, contact time, flow control, breakthrough monitoring and a safe plan for spent material. They would also need to verify finished-water fluoride and any other relevant contaminants rather than relying on the laboratory percentage alone.
The technology’s strongest present case is as a promising laboratory adsorbent that gives an agricultural waste stream a possible water-treatment use. Its low reported synthesis estimate and rapid laboratory removal justify further prototyping, while the TRL-4 status means claims about field reliability, lifetime cost or consumer availability would be premature.
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