Modular hydrogel selectively adsorbs phosphates and hexavalent chromium while enabling phosphate recovery

[Display omitted] •Alginate as the framework module; lanthanum carbonate in chitosan adsorbs phosphate; PEI module enhances Cr(VI) uptake.•Phosphate is recovered as DCPD from LC-CSP desorption solution.•LC-CSP adsorbs 232.02 mg/g phosphate and 474.61 mg/g Cr(VI), retaining 90.72 % performance in sim...

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