Table 1 Various elements present on the 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)

51

55.4

Nitrogen (N)

5

-

Oxygen (O)

39.8

40.4

Aluminium (Al)

0.6

0.7

Silica (Si)

0.7

0.8

Sulphur (S)

1.1

1.1

Calcium (Ca)

1.2

0.7

Iron (Fe)

0.5

0.4

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