| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4436337 | Applied Geochemistry | 2012 | 8 Pages |
This work focused on the removal from water of arsenate in the 100 to 500 μg/L range using Fe-RH-MCM-41 immobilized on GAC by a colloidal impregnation method. A Response Surface Method (RSM) based on the Box–Behnken Design (BBD) was used to evaluate the effects of pH, adsorbent loading, and initial arsenate concentrations. The thermal stability of Fe-RH-MCM-41/GAC was greater than 460 °C because Fe-RH-MCM-41 and epoxy resin covered the GAC, preventing GAC weight loss. The rate and capacity for arsenate adsorption on Fe-RH-MCM-41/GAC were higher than for GAC. The effects of pH, adsorbent loading, and initial arsenate concentration showed significant effects on efficiency, in terms of percent arsenate removal. Significant interaction occurred as positive effects between arsenate and arsenate concentrations, and pH and arsenate concentrations, and as negative effects between pH and pH, adsorbent loading and adsorbent loading, and adsorbent loading and arsenate concentrations.
► Powdered Fe-RH-MCM-41 was loaded by adhesive on GAC, an innovation increasing area. ► Fe-RH-MCM-41 immobilized on GAC removed more arsenate than GAC alone. ► Granular size of Fe-RH-MCM-41-immobilized GAC suitable for water column adsorption. ► Significant effects of pH, As(V) concentration, and initial loading were found. ► An optimal model was made using these variables with RSM based on BBD, a first.
