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| Adsorption of ammonia nitrogen from aqueous solution by Boston ivy stem powder |
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Abstract Batch experiments were carried out to study adsorption characteristics of ammonia from aqueous solution onto Boston ivy (Parthenocissus tricuspidata Planch) stem powder. Effect of pH, initial ammonia concentration, contact time and temperature on adsorption of ammonium were investigated as well. The results showed that the ammonia adsorption capacity of Boston ivy stem powder could be comparable to those of minerals. The optimum pH range for ammonia adsorption was 5~9. The adsorption reached equilibrium at about 18 h, and the rate-controlling steps were film diffusion and intraparticle diffusion. The equilibrium data fitted well with the Langmuir model and the maximum adsorption capacities was 3.18, 4.69 and 5.19 mg/g at 15, 25 and 35°C respectively. Thermodynamic study proved that the adsorption process was a spontaneously endothermic process, and implied that ammonia adsorption by Boston ivy stem powder might be physisorption. Therefore, the Boston ivy stem could be a considerable raw material to develop the ammonia adsorbent.
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Received: 10 October 2009
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