Researchers from the Indian Institute of Technology Gandhinagar, the University of Cambridge and the University of Birmingham have jointly developed a method to remove toxic heavy metals from wastewater while recovering valuable rare earth elements. The researchers say the approach could help address two challenges at the same time: reducing harmful metal pollution in water and recovering materials that are important for several modern technologies.

The protocol uses highly porous materials known as metal-organic frameworks, or MOFs, which can capture specific metal ions from water. The method has been described in a study published in Nature Protocols. The researchers have presented the materials as a kind of “molecular fishing net” capable of filtering unwanted metals while also helping recover rare earth elements that might otherwise be lost in wastewater.

Rare earth elements are used in a range of applications, including magnets, superconductivity, optics and batteries. IIT Gandhinagar researcher Superb Misra said everyday electronic objects such as damaged camera lenses, earphones and old mobile phones can contain these valuable elements. When such materials eventually enter water systems, however, recovering the rare earth elements can become difficult, making efficient separation and recovery methods important.

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At the same time, industrial activity can introduce toxic metals into water, creating an environmental and public health concern. According to Misra, pollutants such as lead, cadmium, nickel and manganese can enter wastewater through industrial processes. Removing these harmful metals while retaining or recovering useful rare earth elements presents a technical challenge because the different metals need to be separated effectively.

The researchers’ protocol is intended to provide a systematic approach for using MOFs to address this problem. Because the materials are highly porous, they can interact with metal ions present in water and facilitate their capture. The research collaboration involving institutions in India and the UK focuses on developing a method that can simultaneously support water purification and the recovery of valuable elements from waste streams.

The work highlights the potential of wastewater treatment as more than a process for simply removing pollutants. Recovering rare earth elements from discarded materials and contaminated water could contribute to greater resource efficiency while reducing the loss of materials used in advanced technologies. The researchers’ findings, published in Nature Protocols, provide a framework for applying the MOF-based approach to the separation of toxic metals and valuable rare earth elements from wastewater.

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