Journal of Industrial and Engineering Chemistry, Vol.9, No.2, 174-180, March, 2003
Heavy Metal Adsorption Characteristics of Zeolite Synthesized from Fly Ash
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Heavy metal adsorption by zeolite synthesized from fly ash was investigated. Approximately 90% of the lead and copper ions originally present in the solution were adsorbed onto the adsorbent within about 30 min after the start of the adsorption and an equilibrium was reached within 2 h. The favorable pH region was from 5 to 6. The maximum adsorption capacities obtained using the Langmuir model were about 1.29 mmole/g for lead and 1.16 mmole/g for copper. The capacity for lead removal by the synthesized zeolite was dependent on the ligand type and concentration. In a binary adsorption system, the influence of copper ions on the lead ion adsorption was small, yet the copper ion adsorption was significantly decreased when lead ions were present.
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