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Table 1 Yields, ash contents, compositions and pore properties of the rice husk hydrochars

From: Rice husk hydrochars from metal chloride-assisted hydrothermal carbonization as biosorbents of organics from aqueous solution

Sample

Yield (%)

Ash content (%)

Zeta potential

Elemental composition

Pore properties

C (%)

H (%)

O (%)

N (%)

S (%)

H/C

O/C

(O + N)/C

BET surface area (m2/g)

Pore volume (cm3/g)

Pore diameter (nm)

RHH

47.10

10.43

− 19.5

45.01

5.04

38.35

1.13

0.04

1.34

0.64

0.66

13.83

0.04

3.07

RHHK0.2

44.85

7.00

− 21.1

48.44

5.19

38.50

0.82

0.05

1.29

0.60

0.61

13.23

0.39

3.24

RHHK0.6

43.48

7.90

− 27.2

53.33

5.48

32.22

1.00

0.07

1.23

0.45

0.47

16.33

0.06

3.72

RHHK1

38.83

8.20

− 32.8

52.93

5.09

32.61

1.02

0.15

1.15

0.46

0.48

18.04

0.05

2.96

RHHCa0.2

47.02

10.80

− 10.9

51.26

5.18

31.77

0.93

0.06

1.21

0.46

0.48

13.75

0.05

3.52

RHHCa0.6

43.09

14.67

− 16.5

58.30

4.64

21.14

1.17

0.08

0.96

0.27

0.29

37.58

0.14

4.18

RHHCa1

42.10

15.00

− 20.1

58.25

4.56

20.81

1.28

0.10

0.94

0.27

0.29

45.97

0.23

5.43

RHHFe0.2

30.59

13.28

− 12.2

58.71

4.65

22.55

0.73

0.08

0.95

0.29

0.30

45.16

0.24

5.87

RHHFe0.6

29.17

15.00

− 25.7

53.09

4.06

27.30

0.46

0.09

0.92

0.39

0.39

42.26

0.23

5.94

RHHFe1

28.97

15.40

− 36.2

54.47

3.96

25.65

0.40

0.12

0.87

0.35

0.36

36.27

0.22

6.55