Removal of arsenic from water using hardened paste of Portland cement.
Portland cement has been used as a new low-cost adsorbent for the removal of arsenic from the water environment. In the batch experiments conducted at an initial concentration of 0.2 mg l(-1) of arsenate, it was found that up to 95% of arsenate could be removed. Kinetic profiles were developed for various conditions. The effect of adsorbent dose, effects of common ions such as Ca2+, Mg2+, Fe3+/Fe2+, Cl-, SO4(2-), NO3(-), PO4(3-) and the effect of pH was studied. Adsorption isotherm studies were performed and it was observed that the Freundlich isotherm was followed with a better correlation than the Langmuir isotherm. Arsenite could also be removed up to approximately 88% using the same material. A new detection method for arsenate/arsenite was developed for routine analysis of arsenic and used during the entire study.
Kundu
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Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
Pal
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Ghosh
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Mandal
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Pal
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D000327:Adsorption; D001149:Arsenates / Q000302:isolation & purification; D001151:Arsenic / Q000032:analysis* / Q000302:isolation & purification; D018053:Arsenites / Q000302:isolation & purification; D003252:Construction Materials; D004326:Drinking; D006863:Hydrogen-Ion Concentration; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D001149:Arsenates; D018053:Arsenites; D014874:Water Pollutants, Chemical; C015001:arsenite; D001151:Arsenic; C025657:arsenic acid