Abstract
This work investigates the effects of flow rate (5–15 Bed Volumes/h), particle size (0.8–1.7 mm), concentration (0.005–0.02 N) and Na+-enrichment of natural clinoptilolite on the removal efficiency of Pb2+, Cu2+, Fe3+ and Cr3+ in aqueous solutions. Ion exchange is performed in an upflow fixed bed reactor. The removal efficiency is increased with decreasing flow rate, particle size and concentration and is improved by a factor of 2–10, depending on the specific metal. The modification of the natural sample is favorable, leading to an increase of removal efficiency by 32–100%. For the experimental conditions examined, removal efficiency order is the following: Pb2+>Cr3+>Fe3+≥Cu2+. Finally, the operation is influenced by the studied parameters, following the order: concentration>volumetric flow rate>particlesize>modification of the material.
| Original language | English |
|---|---|
| Pages (from-to) | 37-43 |
| Number of pages | 7 |
| Journal | Journal of Hazardous Materials |
| Volume | 112 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 9 Aug 2004 |
Keywords
- heavy metals
- clinoptilolite
- fixed bed
- ion exchenge
- selectivity