Table 2 Various elements present on the modified Hydrochar’s surface.

From: Adsorptive potential of hydrochar produced from avocado waste biomass for the sequestration of Alizarin red S dye from aquatic environment

Elements

Weight (%)

Before adsorption

After adsorption

Carbon (C)

59.5

60.7

Nitrogen (N)

3.4

3.4

Oxygen (O)

31.4

31.4

Aluminium (Al)

0.4

0.4

Silica (Si)

1.5

0.9

Sulphur (S)

2.1

2.6

Calcium (Ca)

0.3

-

Iron (Fe)

0.5

0.6

Copper (Cu)

0.8

-

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