Low-Cost Route for Preparing Carbon–Silica Composite Mesoporous Material from Coal Gasification Slag: Synthesis, Characterization and Application in Purifying Dye Wastewater

The promotion of China’s coal gasification industry has produced highly yielded coal gasification slag. This research utilized the coal gasification fine slag as raw material and successfully synthesized a carbon–silica composite mesoporous material with a specific surface area of 500 m2/g and pore volume of 0.54 cm3/g by simple acid leaching technology. The influence of reaction conditions on porosity was discussed in detail, and the optimal sample was characterized by N2 adsorption/desorption analyzer, SEM, TEM and others. Also, by the methylene blue adsorption experiment, we confirmed that the maximum adsorption capacity of synthesized mesoporous material is 182.48 mg/g, showing that it can be envisioned as a competitive candidate for purification of textile industrial wastewater.