Removal of Cr(VI) and Cu(II) Ions from Aqueous Solution by Carbon Prepared from Henna Leaves

Table 1

Langmuir and Freundlich constants for copper and chromium adsorption using henna.

S. No.	Metal ion	Langmuir constants		Freundlich constants
		𝑞max (mg/g)	𝑏	𝐾𝑓	1/𝑛
(1)	Copper	3.650	0.391	2.684	1.004
(2)	Chromium	0.078	6.070	1.099	1.009