Zeolite/slag-based porous geopolymer sphere regenerable composites with enhanced mechanical strength and good dye removal performance

• DOI: 10.1016/j.matlet.2024.136026
• Publication Date: 2024-01-30T16:57:21Z
• Authors: Chengying Bai; Liya Wang; Xiaohong Zhang; Dongni Wang; Zhihui Zhang; Ting Zheng; Lili Zhang; Paolo Colombo
• Keywords: Slag (welding); Suspension

Porous slag-based geopolymer spheres were synthesized by a suspension-solidification method using silicone oil as suspending bath. Zeolite powder, expected to improve or optimize the mechanical and/or adsorption properties, was used as second phase. The porous morphology, structure change, specific surface area, porosity, mechanical properties as well as adsorption capacity of the porous solid waste-based sphere composites were investigated. The mechanical strength was significantly improved by the addition of zeolite, along with a slight decrease for methylene blue adsorption properties. The obtained porous slag-based zeolite/geopolymer spheres with high porosity and acceptable strength have potential application as low cost and high effective adsorption composite materials.