Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr-Doped ZnO Photocatalyst

Table 1

The chromium ion concentration remained after being accumulated for different days.

Soaking days	Remained chromium ion concentration (mg/L)	Amount of chromium ion accumulated (mg/L)
Initial solution	1725.00	—
D1	1625.00	100.00
D2	1632.50	92.50
D4	1503.50	221.50
D6	1511.25	213.75
D8	1498.75	226.25