The Biochar Derived from Carp for High-Efficiency Solar Steam Generation and Water Purification.

[ 8 ] With the increase of pyrolysis temperature, the absorption of MBB in the whole wavelength range, the ultraviolet and visible wavelength regions and the near infrared wavelength region has shown an increasing trend, which is mainly due to three reasons: the first is the increase of specific surface area of MBB (Figure 3 ), resulting in the increase of contact area between material and sunlight; [ 35 , 36 , 37 ] Second, MBB prepared at high temperature has more porous structure (Figure 2 ), which increases the optical path and reduces the light reflection; [ 36 ] third, the graphitization degree of MBB increases with the increase of pyrolysis temperature, which enhances the absorption of MBB in the near‐infrared wavelength range.

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