Synthesis and Characterization of Fe₃O₄-Bentonite Nanocomposite Adsorbent for Cr(VI) Removal from Water Solution

Table 1

Parameters and their levels for OVAT analysis.

Parameters	Unit	Level
Adsorption time	Min	30	60	90	120	150	180	210
pH	—	1	2	3	4	5	6	7
Adsorbent dose	g/L	0.5	1	1.5	2	2.5	3	3.5
Cr(VI) ion initial concentration	mg/L	20	40	60	80	100	120	140