Table 4 Yield, pH, pHpzc and textural properties of activated carbons.

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

 

TAC1

TAC2

TAC3

TAC4

TAC5

TAC6

Yield

21.3

41.3

49.9

73.1

59.7

52.8

pH

7.30

6.90

4.90

5.80

5.30

7.20

pHpzc

7.90

6.25

3.30

5.30

3.85

6.40

BET surface area (m2/g)

190

907

1,445

344

498

394

Micropore surface area (m2/g)

139

266

565

293

242

300

External surface area (m2/g)

50.9

641

880

51.9

256

94.6

Langmuir surface area (m2/g)

254

1,240

1976

455

669

524

Total pore volume (cm3/g)

0.196

0.450

0.730

0.169

0.325

0.273

Micropore volume (cm3/g)

0.065

0.111

0.237

0.136

0.110

0.139

Mesopore volume (cm3/g)

0.132

0.339

0.493

0.033

0.215

0.134

Mesoporosity (%)

67.3

75.3

67.5

19.5

66.2

49.1

Average pore size (nm)

4.13

1.98

2.02

1.96

2.61

2.77