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The X-ray photoelectron spectroscopy (XPS) analysis of the SB-Biochar and SB-N-Biochar. (a) Survey spectrum of SB-Biochar; (b) Survey spectrum of SB-N-Biochar; (c) Deconvoluted N 1 s peaks for SB-Biochar; (d) Deconvoluted N 1 s peaks for SB-N-Biochar.
