Molecular Trap to Clean Water

 


Water pollution like leftover medicines and hygiene products end up in lakes and rivers. A team from the university of Manchester has created a new material that could help reduce this water pollution. The research was posted to Cell Reports Physical Science. It describes a novel way to use a molecular structure called a metal organic cage or MOC. These small cages act like traps. They can hold harmful molecules that can be found in our drinking water supplies.

In the past, MOCs have been studied for use with gas and chemical capture. They are studied in chemical solvents, because their behavior differs when in water. Being able to show the capture of established wastewater pollutants is a viable step for MOCs. 

Jack Wright is a researcher at the university of Manchester. He reports, “being able to use MOCs in water is a really exciting development. We know how valuable MOCs are for capturing unwanted substances, but until now researchers have not been able to apply them to real world water systems. Many harmful chemicals are difficult to remove from water, and with  water pollution becoming a global crisis, the new MOC could provide a valuable tool to help clean up water systems and prevent pollutants from entering our ecosystems, particularly in rivers and lakes near urban or industrial areas where wastewater discharge is most common.”

The cages are composed of metal ions that are connected by organic molecules. The form is a hollow structure that is pyramid-like. The hollow spaces are where the MOC traps molecules like gases are pollutants.

Scientists have added sulfonates to make it compatible with water and allowing MOCs  to function in real world water systems. MOCs use something called hydrophobic binding. This is where a contaminant molecule sticks inside of the cage rather than staying in the water. The MOC’s consecutively capture and hold pollutants.

Dr Imogen Ridelell is a researcher at the University of Manchester. He summarizes, “ One of the real strengths of this method is it flexibility. The approach we have developed could be used to design other water soluble MOCs with different sizes or properties. This opens the door to many future applications, including cleaning up different types of pollutants, development of green catalysts or even development of drug delivery strategies.”

Scientist are worked on ways to capture even more and different contaminants! 

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