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Peak-fitting X-ray photoelectron spectroscopy (XPS) spectra in the C1s, S2p and O1s of B-b-S-P microspheres before and after MB adsorption: C1s of B-b-S-P (a) and B-b-S-P/MB (b); S2p of B-b-S-P (c) and B-b-S-P/MB (d); O1s of B-b-S-P (e) and B-b-S-P/MB (f).
