【正文】
tial use of geopolymeric materials to immobilize toxic metals: part II. Material and leaching characteristics, Miner. Eng. 12(1999) 75– 91. [6] . van Jaarsveld, . van Deventer, . Lukey, The characterization of source materials in ?y ashbased geopolymers, . 57 (2021) 1272–1280. [7] . Valeria, . Kenh, T. Clelio, Synthesis and characterization of materials based on inanic polymers of alumina and silica: sodium polysialate polymers, Int. J. In. Mater. 2 (2021)309– 317. [8] H. Xu, . van Deventer, . Lukey, Effect of alkali metals on the preferential geopolymerization of stilbite/kaolinite mixtures, . Chem. Res. 40 (2021) 3749. [9] . van Jaarsveld, . van Deventer, Effect of the alkali metal activator on the properties of ?y ashbased geopolymers, Ind. . Res. 38 (1999) 3932– 3941. [10] H. Xu, . van Deventer, Microstructural characterization of geopolymers synthesised from kaolinite/stilbite mixtures using XRD,MASNMR, SEM/EDX, TEM/EDX, and HREM, Cement Concrete Res. 32 (2021) 1705– 1716. [11] . van Jaarsveld, . van Deventer, . Lukey, The effect of position and temperature on the properties of ?y ashand kaolinitebased geopolymers, Chem. Eng. J. 89 (2021) 63– 73. [12] R. Ciof?, L. Maffucci, L. Santoro, Optimization of geopolymer synthesis by calcination and polycondensation of a kaolinitic residue,Resour. Conserv. Recycl. 40 (2021) 27– 38. [13] . Hua Xu, van Deventer, The effect of alkali metals on the formation of geopolymeric gels from alkalifeldspars, Coll. Surf. A:Physicochem. Eng. Asp. 216 (2021) 27– 44.