《Table 1–Specific surface area and pore volume of biochar from different pyrolysis temperature.》

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《Enhanced removal of Cr(Ⅵ) by biochar with Fe as electron shuttles》

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The morphologic and structural properties of biochar were firstly characterized by BET and scanning electron microscopy（SEM）.As shown in Table 1，the specific surface area and pore volume of biochar increased with increasing pyrolysis temperature.Specially，specific surface area and pore volume increased significantly from 300°C to 500°C，and then presented slow increase from 500°C to 700°C.The specific surface area of these biochars from walnut shell（427.12 m2/g）is generally higher than that from rice hull（10.66 m2/g）（Khorram et al.，2017） and peanut hull（144.60 m2/g）（Han et al.，2016） produced at similar pyrolysis temperature（i.e.，600°C），suggesting that walnut shell biochars have great potential for pollution remediation due to the abundant interaction site SEM images of BC500 showed a rough and heterogeneous surface，whereas the cross-sectional view showed a high internal porosity，leading to a large surface area，consistent with BET results.