Removal of Cd(ii) from aqueous solution by ferrate-modified sludge biochar: optimization of preparation conditions, adsorption performance, and mechanism.

RSC Adv · 2026 · PMC13147236 · PMID 42100446

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The influence of the K 2 FeO 4 /sludge ratio was relatively weak but still showed a trend of slight improvement with increasing ratio.

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