Removal of Arsenic(V) from Aqueous Solutions by Using Natural Minerals
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Abstract
The removal of arsenic(V) using four different natural minerals were evaluated. Parameters like contact time, pH, adsorbent dosages, and As(V) concentration were optimized. The kinetics of adsorption was observed to be fast and reached equilibrium within 2h. As(V) adsorption on studied minerals was dependent on pH and followed a pseudo-second-order reaction model. For kaolin, maximum adsorption was found at pH 5.0. Whereas, in case of other three minerals, a pH range of 6.0-7.0 was found to be the best for As(V) adsorption. The maximum adsorption capacity (Q) was calculated by fitting Langmuir equation to the adsorption isotherms obtained under a specified condition. From the slope of best fit, the Q values were calculated to be 2.07, 2.15, 1.95 and 0.86 mg As(V) /g of bauxite, wad, iron ore and kaolin, respectively. Desorption of As(V) from loaded materials was dependent on the type of leaching reagents used. Based on the results, it was found that among the studied natural minerals, wad was the best As(V) adsorbent.
참고문헌 (18)
- "A review of the source", pp.517~568 (2002)
- "Guidelines for drinking water quality", 2 (1996)
- "Technologies and costs for removal of arsenic from drinking water" (2000)
- "Effect of dissolved organic matter on the adsorption and stability of As", pp.223~229 (2006)
- "Adsorption and desorption of arsenic on an oxisol and its constituents. Water Res.", 38, pp.2087~2094 (2004)
- "adsorption onto -Al2O3 between 25 and 70oC", pp.793~802 (2001)
- "Arsenic removal from contaminated water by natural iron ores. Miner. Eng", pp.517~524 (2004)
- "The management of arsenic wastes: problems and prospects. J. Hazard. Mater", 76(1), pp.125~ (2000)
- "Treatment of arsenic residuals from drinking water removal processes. EPA", 600, 033, 2001
- "Redox transformations of arsenic and iron in water treatment sludge during aging and TCLP extraction. Environ. Sci. Technol", pp.3476~3481 (2001)
- "A critique of diffuse double layer models applied to colloid and surface chemistry", 45, pp.598~608 (1997)
- "A ligand exchange model for the adsorption of inorganic and organic ligands at hydrous oxide interfaces", pp.291~312 (1980)
- "Mechanisms of arsenic adsorption on amorphous oxides evaluates using macroscopic measurements", pp.204~216 (2001)
- "Adsorption of arsenite and arsenate on amorphous iron oxyhydroxide", 16 (1982)
- "The kinetics of sorption of divalent metal ions onto sphagnum Moss peat", 34, pp.735~742 (2000)
- "Arsenic chemistry in soils An overview of thermodynamic predictions and field observations", 93, pp.117~136 (1997)
- "Adsorption of cadmium from aqueous solutions by perlite", 94, pp.91~303 (2002)
- "Mobility of As on soils in", pp.191~198 (2000)