User:Anh Do/Notebook/CHEM 481 Polymer/2016/09/23

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Testing the beads' ability to filtrate polluted water - Dye (Malachite Green)

  • Preparing the column
    • Weigh the dry column
    • Make sure that the beads have neutral pH. If they are acidic, add powder NaHCO3 in the falcon tube containing the beads
    • Label the columns by the percentage of bentonite in the beads
    • Pour the beads to the columns
    • Let the solution escape the column totally
    • Weigh the column with beads
  • Preparing 50 ppm MG solution
    • Original MG solution: 200 ppm
    • Dilute by putting 10 mL of MG 200 ppm to 40 mL of DI water (dilute by 4 times)
  • Using the column to test the bead's filtration ability
    • Put a 20 mL vial to collect the solution out of the column
    • Using a 5 mL pipette, put 5 mL of 50 ppm MG to the column
    • Clear water will start to flow out of the column and be collected in the vial. Each vial collects 5 mL of solution
    • Record when MG is first observed in the vial
    • Continue pipetting 5 mL of MG 50 ppm into the column until the solution collected has the same color as the original MG 50 ppm. This is when the beads in the column are completely saturated with MG and can no longer filter out the MG
    • Record the change for that column on the vial
    • Start running distilled water through the column. Pipetting 5 mL each time and collect the solution flowing out using a vial. One vial per 5 mL of solution
    • Stop collecting when the solution is clear again.
    • Record the last vial
  • For Activated Carbon,
    • Weighing the column
    • The flow rate was 20 drops a minute
    • MG was observed in the --th vial
    • Solution collected showed the original color in the -- vial
    • Solution was clear again in the --th vial
  • For 10% bentonite beads,
    • Weighing the column
    • The flow rate was 12 drops a minute
    • MG was observed in the --th vial
    • Solution collected showed the original color in the -- vial
    • Solution was clear again in the --th vial
  • Store the columns with beads
    • If water is running through the column, the column can be stored any time
    • If MG is running through the column, let the column run dry before storing

Notes

  • Check the vials where the color changes occurred again