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(a) UV-vis absorption spectra of (A) sodium salicylate (6 mg/mL), (B) g-C3N4@Fe3O4 + HCl + sodium salicylate, and (C) g-C3N4@Fe3O4 + HCl + sodium salicylate + EDTA in 400 nm–700 nm (the inset: photograph of b and c); and (b) UV-vis absorption spectra of (A) Ab1/CEA/Ab2-g-C3N4@Fe3O4 and (B) Ab1/CEA/Ab2-Fe3O4 for 1 ng/mL CEA in phosphate buffer solution (pH 7.0).
