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Waste garlic stems make an adsorbent for arsenic removal

By Paul Grad |

Professor Monoj Kumar Mondal and Anuj Kumar Prajapati from the Dept. of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University, Varanasi, India; www.iitbhu.ac.in) have used nanoporous activated garlic stem carbon (AGSC) — prepared from garlic stem waste — to remove arsenide ions [As(III)], from synthetic water samples and from groundwater. They performed batch adsorption experiments to study the adsorption of As(III) onto AGSC. They obtained maximum removal of 93.3% of As(III) at optimum condition pH = 6, adsorbent dose of 5 g/L, equilibrium time of 150 min, initial As(III) concentration 400µg/L, and temperature 298K. The maximum adsorption capacity of AGSC for As(III) removal was found to be 192.30µg/g. The adsorption process of As(III) onto AGSC was shown to be both exothermic and spontaneous. Arsenic is one of the most toxic metalloids present in groundwater and other water bodies. It is found in various oxidation states, but is mostly found in tri- and pentavalent form. The U.S. Environmental Protection Agency (Washington, D.C.; www.epa.gov) and the World Health Organization (WHO; Geneva, Switzerland; www.who.int) have set the maximum allowable level for total arsenic in water for…
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