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XPS spectra: (a) survey spectra of SCOA2 before and after mercury adsorption, high-resolution spectra of O1s (b), S2p (c) and N1s (d) of SCOA2 before and after mercury adsorption (C0 = 358.49 mg L−1, sample dosage = 30 mg/10 mL, temperature = 30 °C, pH = 6.5, adsorption time = 10 h).
