Chemical Recycling of Expanded Polystyrene Waste: Synthesis of Novel Functional Polystyrene-Hydrazone Surface for Phenol Removal

Table 2

Experimental design and results for % adsorption of phenol on PSH surface.

Trail	Coded values				% Adsorption
		A	B	C	D	Observed
1	−1	−1	+1	−1	82.34	82.39
2	−1	−1	−1	−1	20.33	20.28
3	0	+1	0	0	81.87	81.87
4	+1	+1	−1	−1	21.76	21.72
5	+1	+1	+1	−1	67.98	68.03
6	0	0	0	−1	74.98	74.97
7	−1	+1	+1	+1	76.98	77.03
8	+1	0	0	0	78.65	78.63
9	0	0	+1	0	79.34	79.13
10	+1	−1	+1	+1	84.98	85.03
11	0	0	−1	0	18.67	18.84
12	+1	−1	−1	+1	20.45	20.40
13	−1	+1	−1	+1	08.98	08.93
14	0	−1	0	0	97.98	97.97
15	−1	0	0	0	87.23	87.22
16	0	0	0	+1	76.90	76.89
17	0	0	0	0	83.22	83.26
18	0	0	0	0	83.22	83.26