Abstract
Arsenic is known to be a hazardous contaminant in drinking water that causes arsenical dermatitis and skin cancer. HDTMA-modified erionite (SME), HDTMA-modified cowlesite (SMW), and HDTMA-modified willhendersonite (SMW) have been proposed for the sorption of As(V) from aqueous solution (HDTMA = hexadecyletrimethyl ammonium bromide). Experiments have been conducted to examine the extent of arsenic removal as a function of pH. The effect of initial arsenic concentration and liquid to solid ratio in the batch reactions has also been studied. Influence of time on arsenate efficiency of different sorbents reveal that SME, SMC, and SMW require about 7 hours, to reach the state of equilibrium. Modified zeolites were investigated by x-ray diffraction, Fourier transform infrared analysis, energy dispersive spectroscopy, and scanning electron microscopy. Sorption data for each anion was well described by Freundlich isotherm equation. Thermodynamic parameters (ΔH°, ΔG°, and ΔS°) for As(V) sorption on the modified zeolites were also determined from the temperature dependence.
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