Skip to main content

Table 3 Experimental details along with results obtained in the Response Surface Methodology optimization of Indigo Carmine dye onto activated carbonaceous material (tea-waste)

From: Activated carbonaceous materials from tea waste and its removal capacity of indigo carmine present in solution: synthesis, batch and optimization study

Factors Units Levels
  Low (− 1) Medium (0) High (+ 1)
pH   2 6 12
Adsorbent dose mg 50 130 81
Time min 15 72 120
Run Factor 1: pH Factor 2: Adsorbent dose Factor 3: Time Response: Percentage removal (%)
1 2 250 15 44
2 7 68 120 80
3 6 50 15 30
4 12 250 120 42
5 12 250 120 42
6 6 50 57 65
7 2 250 82 50
8 6 175 57 82
9 7 120 15 67
10 8 250 15 52
11 6 169 120 88
12 6 50 120 20
13 12 50 15 30
14 2 121 15 38
15 2 50 120 32
16 2 124 80 63
17 6 50 120 20
18 12 168 57 32
19 6 50 57 65
20 2 50 120 32