Table 6.
FTIR of E. intestenalis biomass: (before and after chromium and MG biosorption) summary of wave numbers and corresponding functional groups.
| Before adsorption | After adsorption | Functional groups |
|---|---|---|
| 3,448 | 3,508–3,483-3,450 | 3,600–2,800 Sharp peak (Alcohol or Phenol free OH) ν(H-bonded OH) Carboxylic acid: very broad peak |
| 2,923, 2,855 | 2,923, 2,855 | C–H stretching |
| – | 2,293–2,266 | alkanes |
| 2,149 | 2,143 | 2,260–2,100 C≡ C stretch (alkynes) |
| 1653 | 1,650 | 1,680–1,640–C=C– stretch (alkenes) |
| 1,459 | 1,426 | 1,500–1,400 (m) C–C stretch (in–ring) aromatics |
| 1,261 | 1,261 | 1,300–1,150 (m) C–H wag (CH2 X) alkyl halides |
| 1,034 | 1,031 | 1,250–1,020 (m) C–N stretch aliphatic amines |
| – | 992 | CH2 |
| 851 | 849 | 900–675 (s) C–H "oop" aromatics |
| 798 | 797 | 800–600 C–Cl |
| 674 | – | |
| 529 | – | 750–500 C-I |