Say Goodbye to Nanoplastics Slipping Through Filters, This Tree’s Seeds Clean Water in Minutes

A simple tree could help tackle one of the most stubborn forms of water pollution. Seeds from the moringa tree have been shown to remove up to 98% of microplastics from water in just minutes, matching the performance of industrial chemicals. With microplastics now showing up almost everywhere, this low-tech, plant-based method is drawing serious attention.

Microplastic contamination is no longer a marginal issue. According to a study from Columbia University, a single liter of bottled water can contain up to 240,000 plastic particles. That number gives a sense of how widespread the problem has become.

At the same time, even advanced water treatment plants struggle to deal with the smallest particles. They are designed to filter out larger waste, but the tiniest fragments often slip through, raising questions about long-term exposure.

Why Current Filters Miss The Smallest Particles

On paper, treatment plants are highly efficient. They can remove more than 95% of plastic particles larger than 20 micrometers. But below that size, performance drops sharply, sometimes under 40%.

The reason is surprisingly simple. Microplastics carry a negative electrical charge, which makes them repel each other and stay dispersed in water. According to the data, particles around 15 micrometers can pass through sand filters almost untouched.

To deal with this, facilities rely on chemical coagulants like aluminum sulfate, which force particles to clump together. It works, but it comes at a cost. These chemicals can leave residues and often require extra treatment steps to clean the water afterward.

How Moringa Seeds Do The Job Naturally

This is where moringa comes in. Research published in April 2026 in ACS Omega by scientists at São Paulo State University (UNESP) shows that extracts from the seeds can remove more than 98% of microplastics.

As explained in the latest research, proteins in the seeds neutralize the electrical charge of the particles. Once that charge is gone, the microplastics start sticking together, forming larger clumps called flocs that can be easily filtered out.

Tests on UV-degraded PVC confirmed the results. The performance is very close to that of industrial treatments, with 98% versus 98.7%, and in alkaline water the plant-based method even does slightly better. No toxic residues and no complex chemistry, just a natural process doing the work.

“We showed that the saline extract from the seeds performs similarly to aluminum sulfate, which is used in treatment plants to coagulate water containing microplastics. In more alkaline waters, it performed even better than the chemical product,” explained Gabrielle Batista, the study’s first author. 

An Old Practice That Science Is Now Catching Up With

What’s striking is that this is not entirely new. In places like Sudan, people have used crushed moringa seeds to clean water for generations. Now we know why it works. Based on the research from Uppsala University published in Colloids and Surfaces, the proteins in the seeds bind to impurities and form dense clusters that settle more easily than those created by conventional methods.

The effect goes beyond microplastics. The same process reduces water cloudiness and removes between 98% and 99% of indicator bacteria. That makes it especially useful in areas without access to complex infrastructure. There are still some open questions. Researchers point to the release of dissolved organic carbon during treatment, which could affect water quality if not handled properly.

“There’s increasing regulatory scrutiny and health concerns regarding the use of aluminum- and iron-based coagulants, as they aren’t biodegradable, leave residual toxicity, and pose a risk of disease. For that reason, the search for sustainable alternatives has intensified,” noted Adriano Gonçalves dos Reis, a professor at ICT-UNESP and a member of the PPGECA at FEB-UNES.

Tests are ongoing, including trials using water from Brazil’s Paraíba do Sul River, to see how well this method holds up outside the lab.

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