1. Ahmaruzzaman M, Gupta VK (2011) Rice husk and its ash as low-cost adsorbents in water and wastewater treatment. Ind Eng Chem Res 50(24):13589–13613
2. Ahmed FM (2001) An overview of arsenic removal technologies in Bangladesh and India. Technologies for arsenic removal from drinking water, Bangladesh University of Engineering and Technology (BUET) and United Nations University (UNU), pp 251–269. http://archive.unu.edu/env/Arsenic/Ahmed.pdf (July 27, 2012)
3. Ahmed MF (2005) Arsenic mitigation technologies in south and east Asia. In: Towards a more effective operational response, vol. 2, Technical Report No. 31303, Water and Sanitation Program-South Asia and the World Bank, pp 166–207
4. Ajmal M, Rao RAK, Anwar S, Ahmad J, Ahmad R (2003) Adsorption studies on rice husk: removal and recovery of Cd(II) from wastewater. Bioresour Technol 86:147–149
5. Ali I (2012) New generation adsorbents for water treatment. Chem Rev 112:5073–5091