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Hardened Paste of Portland Cement—A New Low-Cost Adsorbent for the Removal of Arsenic from Water

Abstract Portland cement has been used as a low-cost adsorbent for the removal of arsenic from the water environment. In the batch experiments conducted at an initial concentration of 0.2 ppm of arsenate, it was found that arsenate could be removed up to 95%. Kinetic profiles were developed for various conditions. Effect of adsorbent dose, effects of common ions such as Ca2+, Mg2+, Fe3+/Fe2+, Cl−, , , 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 ˜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.