AI Article Synopsis
- Researchers developed a geopolymer sorbent using blast-furnace slag modified with barium to effectively remove sulfate ions (SO4(2-)) from mine water.
- The barium-modified blast-furnace slag geopolymer (Ba-BFS-GP) showed the highest sulfate sorption capacity, outperforming other materials in existing studies.
- Further analysis indicated that Ba-BFS-GP's sorption process aligns with pseudo-second-order kinetics and achieved very low sulfate concentrations in mine effluents during dynamic removal tests.
Article Abstract
Blast-furnace slag and metakaolin were geopolymerised, modified with barium or treated with a combination of these methods in order to obtain an efficient SO4(2-) sorbent for mine water treatment. Of prepared materials, barium-modified blast-furnace slag geopolymer (Ba-BFS-GP) exhibited the highest SO4(2-) maximum sorption capacity (up to 119mgg(-1)) and it compared also favourably to materials reported in the literature. Therefore, Ba-BFS-GP was selected for further studies and the factors affecting to the sorption efficiency were assessed. Several isotherms were applied to describe the experimental results of Ba-BFS-GP and the Sips model showed the best fit. Kinetic studies showed that the sorption process follows the pseudo-second-order kinetics. In the dynamic removal experiments with columns, total SO4(2-) removal was observed initially when treating mine effluent. The novel modification method of geopolymer material proved to be technically suitable in achieving extremely low concentrations of SO4(2-) (<2mgL(-1)) in mine effluents.
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| http://dx.doi.org/10.1016/j.jhazmat.2016.06.001 | DOI Listing |
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