New study explores how water helps clean up toxic pesticides from drinking water

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The role of hydration in the removal of glyphosate (GLY) and aminomethylphosphonic acid (AMPA) by nanofiltration membranes is an area that has garnered significant attention in recent studies. Researchers Trinh PB et al. have investigated the properties of hydration and its impact on GLY/AMPA removal.

The study reveals that charge and dielectric exclusions are dominant in membranes with molecular weight cut-off (MWCO) greater than 150 Da. This is evident when GLY and AMPA in neutral forms are partially removed, with removal rates ranging from 50-80% at pH 2. However, when GLY/AMPA are negatively charged, the removal rate increases significantly, indicating the growing contribution of both charge and dielectric exclusions.

Further analysis shows that the hydration layer can be shredded at higher applied pressures, leading to a decrease in removal efficiency. Specifically, when the applied pressure is increased from 86% to 28%, and from 27% to 7% for GLY and AMPA respectively. This suggests that the presence of a hydrated layer plays a crucial role in the removal process.

The findings of this study have important implications for tuning nanofiltration membranes for water purification. By understanding the role of hydration in removing small and charged organic micropollutants, researchers can develop more effective strategies for improving membrane performance. This research serves as a reminder that even at the molecular level, the universe is governed by the same fundamental principles of physics and chemistry that shape our everyday experiences.

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In a world where our drinking water can be contaminated with toxic chemicals like glyphosate and aminomethylphosphonic acid, scientists are racing to develop more efficient ways to remove them. Researchers Trinh PB and his team have made a breakthrough in understanding how nanofiltration membranes work to clean polluted water. They found that these tiny filters use a combination of steric, Donnan, and dielectric exclusions to trap the pollutants. But what's really important is the role of hydration – the layer of water molecules surrounding the pollutants.

Imagine a thin film of water molecules clinging to glyphosate and aminomethylphosphonic acid, like a protective shield. At first, this hydration layer seems like just a minor obstacle for the nanofiltration membrane to overcome. But as researchers applied higher pressures, they watched in amazement as the hydration layer began to break down. This allowed more of the pollutants to pass through – but also revealed that the true power of these membranes lies not just in their physical properties, but in how they interact with the water molecules themselves.

So why does this matter? The ability to tune nanofiltration membranes for optimal performance could be a game-changer for communities around the world struggling to access clean drinking water. By understanding the role of hydration in removing these toxic pollutants, researchers can design membranes that are more efficient and effective – paving the way for safer, healthier water for all.

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Nanofiltration, which filters tiny particles from water, works by using special properties of its walls to trap pollutants like glyphosate and aminomethylphosphonic acid. But what makes it work? Researchers wanted to know how hydration - the layer of water molecules that surrounds these pollutants - plays a role.

In their study, the team found that when the pH level was low or acidic, the water layer around the pollutants made them easier to remove from the water. As the pH level went up, this "water shield" grew stronger and helped to trap more of the pollutants. The researchers used special tools like molecular dynamics simulations and infrared spectroscopy to see how the water molecules interacted with these pollutants. They discovered that even when the applied pressure was high, the water layer around the pollutants could still be disrupted, allowing some of them to escape. This finding is important for developing more effective filters for cleaning contaminated water.