The atomic ratios of H/C, O/C, and (O + N)/C all showed a decreasing trend, indicating that the polarity of biochar decreased with increasing pyrolysis temperature [ 20 ], which was consistent with other studies [ 20 , 21 , 22 ].
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Effects of Pyrolysis Temperature and Acid-Base Pre-Treatment on the Synthesis of Biochar-Based Slow-Release Selenium Fertilizer and Its Release in Soil.
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