Cesium salt of tungstophosphoric acid/mesoporous (zirconia–silica) composite for highly efficient synthesis of 7-hydroxy-4-methyl coumarin and removal of methylene blue

Cs salts of tungstophosphoric acid supported mZS with varying amounts of Cs ions content have been prepared by a two-step impregnation technique, and found to be effective for the removal of hazardous dyes such as MB from an aqueous solution.