Nanomaterials, tiny particles measuring 1 to 100 nanometers, can be produced through biological methods, known as green nanomaterials. Natural sources like plants, microbes, and organic polymers such as carbohydrates, proteins, and lipids play a key role in synthesizing these green nanoparticles. These environmentally friendly particles provide an alternative for eliminating toxins from water, presenting a cost-effective and convenient solution for wastewater treatment.