1. Low-cost adsorbents: growing approach to wastewater treatment—a review;Gupta;Crit Rev Environ Sci Technol,2009
2. http://www.thomas.k12.ga.us/userfiles/687/Classes/41096/Earths%20Water%203%20PP.ppt [accessed 29.05.17].
3. http://www.cpo.com/home/Portals/2/Media/post_sale_content/PES/PES_Chap_22/PresentationSlides/PESChp22WaterSystems1.ppt [accessed 29.05.17].
4. Recent advances in the use of graphene-family nanoadsorbents for removal of toxic pollutants from wastewater;Chowdhury;Adv Colloid Interface Sci,2014
5. Hazards of heavy metal contamination;Järup;Brit Med Bull,2003