Table 3. Total Surface Acidic and Basic Groups of ACs.

	basic functional group (mmol/g)			acidic functional group (mmol/g)
samples	AC-	ACP-	ACM-	AC-	ACP-	ACM-
2/1-800-60	1.013 (±0.011)	1.031 (±0.012)	1.534 (±0.018)	0.114 (±0.014)	0.159 (±0.010)	0.252 (±0.027)
2/1-850-60	1.026 (±0.001)	1.099 (±0.009)	1.592 (±0.003)	0.138 (±0.025)	0.211 (±0.005)	0.257 (±0.005)
2/1-900-60	1.082 (±0.009)	1.134 (±0.005)	1.749 (±0.005)	0.164 (±0.005)	0.314 (±0.005)	0.324 (±0.020)
2/1-950-60	1.177 (±0.008)	1.211 (±0.019)	2.112 (±0.011)	0.163 (±0.014)	0.355 (±0.016)	0.357 (±0.020)
2/1-900-40	0.943 (±0.033)	1.138 (±0.004)	1.828 (±0.002)	0.164 (±0.001)	0.286 (±0.021)	0.294 (±0.007)
2/1-900-80	0.944 (±0.009)	1.113 (±0.011)	1.751 (±0.031)	0.146 (±0.016)	0.330 (±0.006)	0.341 (±0.009)
2/1-900-100	0.945 (±0.004)	1.090 (±0.01417)	1.715 (±0.02217)	0.123 (±0.007)	0.323 (±0.005)	0.314 (±0.014)
5/1-900-60	0.930 (±0.002)	0.912 (±0.008)	1.629 (±0.035)	0.092 (±0.002)	0.303 (±0.007)	0.226 (±0.004)
3/1-900-60	0.960 (±0.032)	1.081 (±0.003)	1.636 (±0.005)	0.121 (±0.012)	0.315 (±0.004)	0.245 (±0.008)
1/1-900-60	1.068 (±0.002)	1.226 (±0.033)	2.105 (±0.008)	0.176 (±0.013)	0.385 (±0.027)	0.351 (±0.007)