Abstract
Sulfonated peat humic acid prepared on the reaction of peat humic acid with sulfuric acid boron trifluoride complex at 100°C for 90 min was used as adsorbent for mercury (II). After shaking 100 ml of 1 ppm mercury (II) chloride aqueous solution with 5100 mg of adsorbent for 24 hr at 23°C, the residual concentration of mercury (II) in the supernatant solution was determined. It was found that the sulfonated peat humic acid selectively adsorbed mercury (II) from aqueous solution over a wide range of pH with high efficiency. The adsorption behaviour of sulfonated peat humic acid was found to be the Langmuir's isotherm. The presence of foreign metals such as sodium, calcium, cadmium (II), copper (II), lead (II), manganese (II) and iron (III) did not interfere with the adsorption of mercury (II) from aqueous solution containing 1000 times as much foreign ions as mercury (II). But presence of chloride reduced the adsorption when the concentration of chloride ion is more than 1000 ppm. Sulfonated peat humic acid which adsorbs mercury (II) can be easily regenerated by the treatment with 4 N hydrochloric acid.
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