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3.2.Effects of ball milling on biochars physicochemical properties 3.2.1.Increase of surface area.The specific surface area of the bm-biochars were all greater than that of their precursors corresponding unmilled biochars, table 1.The unmilled biochars produced at 300 c had very low surface area 02 m 2 g, which is common for biochars produced at low temperatures guo and chen, 2014.
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