FIELD: sorbents. SUBSTANCE: invention relates to technology for preparing sorbents, namely, to sorbents that can be used for purification of aqueous solution from heavy metals, for example, copper and zinc. Proposed method involves using oil cake as waste in preparing vegetable food oil from watermelon seeds. Oil cake is washed out for colorless washing out water, dried at 60-65 C to constant mass, ground, sieved and fraction 0.2-2 mm is taken off. EFFECT: simplified technology, enhanced sorption capacity of sorbent. 3 ex
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