Fig. 5From: Cesium-adsorption mechanisms of woody charcoal discussed on the basis of its functional groups and nanostructureIR-PA spectra in the 2000–800 cm−1 region for a raw Japanese oak sapwood (green solid line), b OC300-2 (red solid line), c OC500-2 (brown solid line), and d OC700-2 (black solid line). All spectra are displayed with the same vertical axis scaleBack to article page