IIT Gandhinagar-Led Team Publishes a MOF Recipe That Strips Toxic Metals and Recovers Rare Earths From Wastewater

Industrial wastewater and electronic waste present India with two problems at once: toxic heavy metals that must be removed before water is discharged, and valuable rare-earth elements that are lost when that water is treated as pure waste. A team led by IIT Gandhinagar (IITGN), working with the University of Cambridge and the University of Birmingham, has published a detailed laboratory protocol in Nature Protocols showing how one class of porous materials can tackle both jobs.

The research

The paper, "Selective heavy-metal sequestration and rare-earth element recovery using metal–organic frameworks" (Dhruv Menon et al., DOI 10.1038/s41596-026-01425-y), sets out step by step how to design, characterise and use metal–organic frameworks (MOFs) for water clean-up and resource recovery. IITGN announced the work in early October 2026, and it was subsequently covered by phys.org, EurekAlert! and Technology Networks.

MOFs are crystalline materials built from metal ions or clusters linked by organic molecules. Their sponge-like internal structure gives them very large surface areas, and chemists can tune their pores to bind particular ions. The protocol uses copper(II)-based frameworks as its model system.

According to the paper and the institute's release, the approach targets:

• Toxic metals for removal: lead (Pb(II)), cadmium (Cd(II)), nickel (Ni(II)) and manganese (Mn(II)).
• Rare earths for recovery: neodymium (Nd(III)), yttrium (Y(III)) and dysprosium (Dy(III)).

The team tested the materials under conditions intended to resemble real effluent, not just clean laboratory solutions: alkaline and turbid wastewater, artificial seawater, and water samples made from electronic waste.

The numbers

Menon, the paper's first author, said that one gram of the copper-based MOF could capture nearly half a gram of lead (about 490 mg/g), and roughly a quarter of a gram each of cadmium (264 mg/g) and manganese (226 mg/g), according to the IITGN release as reported by phys.org and EurekAlert!. The release also reported rare-earth uptake capacities of about 351 mg/g for neodymium and 343 mg/g for yttrium.

"The most interesting aspect was observing the MOF in our protocol demonstrate substantial adsorption capacities," Menon said in the release.

Those capacities matter because adsorbents are judged on how much contaminant they hold per gram: the more a material captures, the less of it a plant needs to buy, regenerate and eventually dispose of.

The project is led by Prof. Superb Misra of IITGN's Department of Materials Engineering, who heads the institute's Bio Nano Materials Group.

Why it matters for India

Neodymium and dysprosium are essential ingredients in the permanent magnets used in electric-vehicle motors, wind turbines and electronics. India imports most of its rare-earth magnets, and the government has launched a National Critical Mineral Mission, including an incentive scheme for recycling critical minerals. Coverage of the IITGN work noted that the research aligns with that push. Recovering rare earths from e-waste streams, rather than only mining them, is one way to reduce that dependence.

At the same time, heavy-metal contamination from industries such as electroplating, battery manufacturing and mining remains a significant water-quality concern. A material that can strip toxic metals and recover valuable ones in the same treatment train could, in principle, turn a compliance cost into a partial revenue stream.

The caveats

This is a laboratory protocol, not a deployed technology. Misra cautioned that controlled batch experiments cannot fully predict how the materials will behave in complex real-world wastewater, and said further work is needed on large-scale fabrication, cost analysis, life-cycle assessment of the MOFs and regulatory testing. The figures reported are adsorption capacities under test conditions; they do not yet indicate how many treatment cycles the material survives, how much it costs per litre treated, or how pure the recovered rare earths are.

The value of a Nature Protocols paper lies partly in reproducibility: it gives other laboratories and companies a detailed recipe to build on. Whether that recipe leads to pilot plants at Indian e-waste recyclers or industrial effluent sites will be the next thing to watch.

Sources

• phys.org: https://phys.org/news/2026-10-approach-captures-toxic-metals-recovers.html
• EurekAlert! (AAAS): https://www.eurekalert.org/news-releases/1146643
• Technology Networks: https://www.technologynetworks.com/applied-sciences/product-news/porous-materials-recover-rare-earths-from-wastewater-417092
• IIT Gandhinagar News: https://news.iitgn.ac.in/research-cleaning-water-finding-treasure/
• The Blunt Times: https://theblunttimes.in/iitgn-researchers-develops-mof-method-to-clean-wastewater-recover-rare-earths/73514/
• Nature Protocols paper: https://www.nature.com/articles/s41596-026-01425-y