FIELD: sorbents. SUBSTANCE: composite sorbent is provided based on humic acids chemically bound to silica matrix by way of cocondensation reaction. Weight ratio of silica to humic acids ranges from 1:1 to 1.1:1. Sorption capacity with regard to heavy metal ions $$$ varies from 2.6 to 4.4 mmol/g. EFFECT: improved heavy metal sorption capacity.
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