Many researchers have used nanoparticles as adsorbents to remove water pollutants including arsenic
after modifying the properties of nanoparticles by improving reactivity, biocompatibility, stability, charge
density, multi-functionalities, and dispersibility. For arsenic removal, nano adsorbents emerged as the
potential alternatives to existing conventional technologies. The present study critically reviewed the
past and current available information on the potential of nano adsorbents for arsenic removal from
contaminated water and the challenges involved in that. The study discussed the separation and
regeneration techniques of nano adsorbents and the performance thereof. The study evaluated the
adsorption efficiency of the various nanoparticles based on size of nanoparticles, types of nano adsorbents,
method of synthesis, separation and regeneration of the nano adsorbents. The study found that
more studies are required on suitable holding materials for the nano adsorbents to improve the
permeability and to make the technology applicable at the field condition. The study will help the
readers to choose suitable nanomaterials and to take up further research required for arsenic removal
using nano adsorbents.