16Blast-furnace slag and metakaolin were geopolymerised, modified with barium or treated with a 17 combination of these methods in order to obtain an efficient SO 4 2-sorbent for mine water treatment. 18Of prepared materials, barium-modified blast-furnace slag geopolymer (Ba-BFS-GP) exhibited the 19 highest SO 4 2-maximum sorption capacity (up to 119 mg g -1 ) and it compared also favourably to 20 materials reported in the literature. Therefore, Ba-BFS-GP was selected for further studies and the 21 factors affecting to the sorption efficiency were assessed. Several isotherms were applied to describe

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