Al₂O₃ Nanoparticles Promote the Removal of Carbamazepine in Water by Chlorella vulgaris Immobilized in Sodium Alginate Gel Beads

Table 2

Orthogonal experimental results.

Group number	Factor level				Removal efficiency (%)	Strength
	A	B	C	D
1	0.5	1.0	1	1	82.43 ± 1.49	+
2	0.5	1.6	2	2	82.66 ± 2.99	++
3	0.5	2.4	3	3	78.53 ± 0.80	+++
4	1.0	1.0	3	2	90.28 ± 0.51	+
5	1.0	1.6	1	3	80.97 ± 0.28	++
6	1.0	2.4	2	1	89.78 ± 5.18	+++
7	1.5	1.0	2	3	76.36 ± 0.78	+
8	1.5	1.6	3	13	94.68 ± 0.81	+++
9	1.5	2.4	1	2	78.58 ± 0.93	++
K1	78.79	89.29	89.92	90.92
K2	79.45	81.63	77.35	80.39
K3	86.34	83.28	69.41	65.31
R	5.800	3.806	7.168	9.215

The number of “+” indicates the level of mechanical strength of the prepared microalgae beads. More “+” means higher level. K₁, K₂, and K₃ represent the value of CBZ removal under different factors at leve1, 2, and 3, respectively. R represents the range of CBZ removal under different factors.