Synthesis and Characterisation of Activated Carbon Obtained from Marula (Sclerocarya birrea) Nutshell

Table 1

Yield of activated carbon from H₂SO₄ treatment.

Acid (%)	Temperature (°C)				value
	200	400	500	600
Control	83.0 ± 0.01	NY	NY	NY	ns
20	82.9 ± 0.01^a	15.6 ± 0.01^b	33.1 ± 0.02^c	39.8 ± 0.01^c	<0.05
40	83.4 ± 0.01^a	19.8 ± 0.02^b	32.2 ± 0.01^c	40.6 ± 0.01^c	<0.05
60	93.2 ± 0.02^a	28.5 ± 0.01^b	38.0 ± 0.02^c	41.5 ± 0.01^c	<0.05

 = distilled water, NY = no yield; ns = not significant; mean ± standard deviations are reported. Means in a row with different superscripts (^a,b,c) are significantly different at .