Potassium Permanganate Doped Geopolymers for Remedial Applications

摘要: This study investigates the use of KMnO4 doped geopolymers as controlled-release materials for remedial applications. The were prepared by mixing alkali activated Na-silicate solutions, metakaolin, and various amounts granular KMnO4. Samples heat treated at 75 °C 48 h. Concentrations in samples 1, 2, 3 1.40 × 10−1, 4.63 × 10−1, 6.07 × 10−1 g/cm3, respectively. 1D column experiments showed that a high MnO4− release rate lasted first few hours, followed gradual decrease release. Neither cracks nor surface erosion observed throughout experiments. Sample 1 approached exhaustion end Day 7. It took about 18 d releases 2 3. Modeling suggested diffusion dissolution-related fast transport most important mechanisms. latter mechanism involves creation connected secondary porosity dissolution granules. contribution Fickian to total decreased content increased, became increasingly important.