| Mineral: |
Montmorillonite |
| Reference: |
PKZZ11 |
| Supplier: |
Clay Minerals Society Source Clays Repository |
| Trade Name: |
SWy-1 (Crook County, Wyoming) |
| Deposit: |
Newcastle formation (cretaceous) |
| Preparation: |
pre-treated by suspending 15 g montmorillonite in 150 mL 0.001 M HCl. The suspension was mixed for 30 minutes, 0.50 mL 30% H2O2 (J.T. Baker) was
then added, and the suspension was mixed for an additional 30 minutes. The suspension was
centrifuged for 6 hours at 4500 rpm (centrifuge: Allegra-22R, rotor: S4180). This was calculated
to leave particles less than 50 nm in suspension. The supernatant was discarded and the wet solids were transferred to 6000-8000 MWCO dialysis bags which were placed in a 4 L glass beaker with 0.01 M NaCl. The solids were dialyzed for 7 days and the NaCl solution was changed at least once per day. The solids were extruded from the dialysis bags into two 200 mL centrifuge bottles and suspended in 150 mL MQ H2O. These suspensions were mixed overnight to break up particle aggregates formed during dialysis. The suspensions were centrifuged for 5 minutes at 1000 rpm and the supernatant decanted into two clean 200 mL centrifuge bottles. This supernatant phase now contained the <2.0 µm particle size fraction. The suspension was centrifuged 6 hours at 4500 rpm and the supernatant was decanted and discarded to remove >50nm particles. The wet solids (50 nm to 2 µm particles size) were transferred to a glass petri dish and dried for two weeks at 40 °C |
| CEC: |
76.4 meq/100g |
| Sample characterized via: |
☑ X-ray Diffraction (XRD)
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