Table 3. FTIR Peaks (cm–1) and Functional Groups in Final Sediment of Different Treatmentsa,b.
| wave number range cm–1 | functional groups | C | T1 | T2 | T3 | T4 |
|---|---|---|---|---|---|---|
| 3670–3610 | –OHA | 3630.03 (−OHA) | 3630.03 (−OHA) | 3618.46 (−OHA) | ||
| 3220–3600 | –OHNP | 3377.36 (−OHNP) | 3361.93 (−OHNP) | 3392.79 (−OHNP) | ||
| 3000–4000 | –OH | 3874.99 (−OH) | 3776.62 (−OH) | 3743.83 (−OH) | ||
| 2372 | –N=H+ | 2364.73 (−N = H+) | ||||
| 1990–2200 | –C≡C– | 2177.63 (−C≡C−) | ||||
| 1550–1650 | –N=H | 1637.56 (−N=H) | 1647.21 (−N=H) | 1647.21 (−N=H) | 1637.56 (−N=H) | 1651.07 (−N = H) |
| 1430–1490 | –CH2 | 1521.84 (−CH2) | ||||
| 1000–1095 | =C–H | 985.62 (=C–H) | 985.62 (=C–H) | 985.62 (=C–H) | 985.62 (=C–H) | 987.55 (=C–H) |
| 800–700 | –C–Ha | 796.6 (−C–Ha) | 775.38 (−C–Ha) | 773.46 (−C–Ha) | 775.38 (−C–Ha) | |
| 800–700 | –C–Br | 692.44 (−C–Br) | 690.52 (−C–Br) | 688.59 (−C–Br) | 692.44 (−C–Br) | 690.52 (−C–Br) |
| 600–500 | –C–I | 516.92 (−C–I) |
a
A: aromatic; NP: nonpolymeric; M: metal.
b
Control: no biochar; T1: paddy straw biochar (PSB) application in sediment; T2: sediment amended with KOH-activated PSB; T3: sugar cane bagasse biochar (SBB) application in sediment; T4: sediment amended with KOH-activated SBB.