Rapid fabrication of coal gangue-based alkali activated foams and application as pH regulators

High porosity coal gangue-based alkali activated foams were synthesized by an efficient microwave foaming route within 3 min. The porosity, density, porous structure and compression strength of the foams produced using different microwave power settings, together with their use as pH regulators, were evaluated. The alkaliactivated foams with 100 % coal gangue as the mineral constituent can be used for pH buffering applications, while simultaneously providing a high value-added route to reuse the solid waste.

Automated summary

High porosity coal gangue-based alkali activated foams were synthesized using an efficient microwave foaming technique within a short timeframe. The foams' porosity, density, porous structure, and compression strength were evaluated, along with their potential use as pH regulators. The study showed that alkali activated foams with 100% coal gangue as the mineral constituent can effectively buffer pH levels while providing a valuable route for solid waste reuse.