Table 3 Experimental design for optimization of carbonization parameters.

From: Ultrahigh and kinetic-favorable adsorption for recycling urea using corncob-derived porous biochar

Run

A: Carbonization temperature (°C)

B: Carbonization time (h)

C: Heating rate (℃/min)

Urea adsorption (mg/g)

1

300.00

1.00

10.00

288.83

2

300.00

3.50

15.00

376.50

3

300.00

3.50

5.00

359.54

4

300.00

6.00

10.00

443.18

5

400.00

6.00

5.00

380.50

6

400.00

3.50

10.00

375.65

7

400.00

3.50

10.00

375.65

8

400.00

1.00

15.00

384.70

9

400.00

3.50

10.00

375.65

10

400.00

3.50

10.00

375.65

11

400.00

3.50

10.00

375.65

12

400.00

1.00

5.00

409.49

13

400.00

6.00

15.00

484.60

14

500.00

6.00

10.00

568.09

15

500.00

1.00

10.00

480.59

16

500.00

3.50

5.00

356.98

17

500.00

3.50

15.00

518.98