Table 2 Elemental composition of TRM and its derived activated carbons.

From: Twigs-derived activated carbons via H3PO4/ZnCl2 composite activation for methylene blue and congo red dyes removal

Element (%)

TRM

TAC1

TAC2

TAC3

Carbon

46.3

32.9

62.3

78.6

Hydrogen

6.87

1.60

2.17

1.84

Nitrogen

0.265

0.197

0.492

0.615

Oxygen

46.5

65.2

35.0

18.8

Sulphur

0.041

0.068

0.077

0.095