Modification of Hierarchical Pore Zeolite BEA and its Application in the Purification of Ink Wastewater

Zeolite BEA with microporous and mesoporous structure was prepared through alkali etching of traditional zeolite BEA. The changes of crystal form, pore structure and morphology of zeolite before and after treatment and its purification effect on ink wastewater were studied. The effects of zeolite amount, treatment time and treatment temperature on COD and chroma removal rate of ink wastewater are systematically studied. The results show that the alkali-etching-modified zeolite BEA maintains the crystal structure and morphology of zeolite, and has higher specific surface area, pore volume and pore size distribution. Under the optimal treatment conditions, the alkali-etching-modified zeolite BEA has higher removal performance than the traditional zeolite BEA. The COD and chroma removal rates of ink wastewater can reach 98% and 99% at 15 min and 30∘C.