[Retracted] Preparation of Alumina Nanoparticles and Coating with Polyvinylpyrrolidone to Treat Cadmium Contamination of Water

Table 2

The amount of cadmium that was adsorbed with the change of the acidity function and the immersion time in a solution of concentration 30 ppm.

pH	Capacity
	Time 10 (min)	Time 30 (min)	Time 60 (min)
2	2.23	4.78	6.17
4	1.75	4.70	5.08
6	1.20	2.23	3.50