Due to the huge growth in population, industrialization, and the ensuing disruption of natural phenomena, water pollution has emerged as a major global concern. The extensive occurrence of hazardous pollutants in water bodies as a result of this development poses grave risks to the ecosystem and public health. Many water sources include chemicals, including pesticides, dyes, heavy metals, medicines, and other newly discovered pollutants. Because of their poisonous effects, heavy metals like lead, mercury, and cadmium are especially dangerous, even in little amounts. Dyes are frequently carcinogenic and detrimental to aquatic life, especially in the textile industry. Pesticides, which are widely used in agriculture, have the ability to linger in the environment and find their way into water bodies through runoff, and pharmaceutical residues from animal and human excretion or incorrect disposal are becoming more and more known for their potential to harm wildlife and people even at low levels. Because of their increasing prevalence and effects, emerging contaminants like microplastics, endocrine disruptors, and personal care items are also causing serious concern. Adsorption has become more and more well-liked in recent years as a particularly easy, affordable, and effective way to purify water. Pollutants stick to the surface of an adsorbent material during the adsorption process, and this process' efficacy is dependent on a number of important variables. These factors include the length of time the pollutant is in contact with the adsorbent; the concentration of the pollutant in the water; the amount of adsorbent material used; the kinetics of adsorption; isotherms, which characterize the relationship between the concentration of the pollutant in solution and the amount adsorbed; and reaction conditions, such as pH and temperature, which can significantly influence the adsorption process. Nanoparticles have special chemical and physical characteristics that improve adsorption techniques used in water treatment. These excellent nanoscale solutions for water contamination take advantage of the high surface area and reactivity of nanoparticles. For example, metallic nanoparticles with antibacterial and photocatalytic qualities, like silver and titanium dioxide, are great at killing infections and decomposing organic pollutants. Because of their huge surface areas, carbon nanotubes and graphene are excellent at adsorbing a variety of pollutants, such as heavy metals and organic chemicals. The development of nanoscale methods for improving water purity and treating it presents a viable approach to solving the problems associated with water contamination. Water purification processes can be made more sustainable, selective, and efficient by adding nanoparticles and other nanomaterials to current treatment techniques. Nanotechnology has the potential to completely change how we treat and manage water resources, ensuring safer and cleaner water for present and future generations, as long as research in this area continues.