Table 1. Reduction Dependence of the Relative Percentage Contribution of Different Functional Groups and the Relative Percentage Elemental Composition Estimated by Full Scan Spectra.

	group	pristine	50 °C	100 °C	150 °C	200 °C
elemental composition (%)	C	75.43	75.62	76.24	83.86	89.83
	O	24.57	24.38	23.76	16.14	10.17
	C=C/C–C	30.05	36.43	40.72	71.53	83.16
C1S deconvolution	C–OH	27.15	20.14	18.88	14.86	8.20
	>C=O	35.33	32.74	31.65	9.32	5.11
	–COOH	10.05	8.75	8.09	4.29	3.54
O1S deconvolution	–COOH	16.53	16.72	17.72	46.25	35.45
	>C=O				30.38	46.39
	C–OH	83.47	83.28	82.28	23.36	18.16