Batch experiments were performed to determine the kinetic, equilibrium and thermodynamic parameters for As(III) adsorption on coconut fiber adsorbent. All the experiments were conducted at room temperature. Variable doses of adsorbent (1–20 g/L) were added to beakers containing 250 ml of water sample and having concentration 0.380 mg/L at room temperature (26 1 C) to determine optimum adsorbent dose for As(III) removal. The suspensions were stirred at 100 rpm for 10 min and then 80 rpm for remaining time. The stirring was carried out for 6 h. For isotherm study, 10 g/L of the adsorbent was stirred with 250 ml of As(III) solutions having initial concentrations of 0.2, 0.5, 1.0, 1.5 and 2.0 mg/L for 8 h at room temperature (26 1 C). The kinetic study was performed by varying time from 1 h to 10 h 10 g/L of the
adsorbent was added to 250 ml of As(III) solutions having concentration of 0.40 mg/L in series of beakers and stirred as
mentioned above at room temperature (26 1 C). Thermodynamic study was conducted by varying temperature from 10 to 50 C at adsorbent dose of 10 g/L contact time of 8 h, pH 4, mixing speed of 80 rpm and initial adsorbate concentration of 0.5 mg/L. In every experiment, suspensions were allowed to settle for 30 min after stirring, supernatant were filtered and residual As(III) concentration in filtrates were measured. The adsorption capacity ‘q’ of coconut fiber adsorbent i.e. amount of As(III) adsorbed per unit mass of adsorbent was estimated using the equation:
Batch experiments were performed to determine the kinetic, equilibrium and thermodynamic parameters for As(III) adsorption on coconut fiber adsorbent. All the experiments were conducted at room temperature. Variable doses of adsorbent (1–20 g/L) were added to beakers containing 250 ml of water sample and having concentration 0.380 mg/L at room temperature (26 1 C) to determine optimum adsorbent dose for As(III) removal. The suspensions were stirred at 100 rpm for 10 min and then 80 rpm for remaining time. The stirring was carried out for 6 h. For isotherm study, 10 g/L of the adsorbent was stirred with 250 ml of As(III) solutions having initial concentrations of 0.2, 0.5, 1.0, 1.5 and 2.0 mg/L for 8 h at room temperature (26 1 C). The kinetic study was performed by varying time from 1 h to 10 h 10 g/L of theadsorbent was added to 250 ml of As(III) solutions having concentration of 0.40 mg/L in series of beakers and stirred asmentioned above at room temperature (26 1 C). Thermodynamic study was conducted by varying temperature from 10 to 50 C at adsorbent dose of 10 g/L contact time of 8 h, pH 4, mixing speed of 80 rpm and initial adsorbate concentration of 0.5 mg/L. In every experiment, suspensions were allowed to settle for 30 min after stirring, supernatant were filtered and residual As(III) concentration in filtrates were measured. The adsorption capacity ‘q’ of coconut fiber adsorbent i.e. amount of As(III) adsorbed per unit mass of adsorbent was estimated using the equation:
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