Page 364 - Industrial Wastewater Treatment, Recycling and Reuse

336 Industrial Wastewater Treatment, Recycling, and Reuse

47.0
46
45
44
43
% T 42 2344 668
41
2363
40
2852
39 1447 1241
38 2925 1053
37 3428
1638
36.0
4000.0 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400.0
cm-1
Figure 8.2 FTIR spectrum of raw untreated tea waste (TW).

Figure 8.3 FTIR spectrum of activated egg shell (AES) adsorbent.

peaks at 750.26 and 680.83 may be due to the presence of CdCl stretching.
1
A sharp and an intense peak at 464.81 cm is assigned to aryl disulfides
(SdS stretching).
Figure 8.4 depicts the FTIR spectrum of binary mixed oxide of Al-Fe
(BMO) of Fe and Al, showing bands at low wave numbers
1
400.00 cm , which can be attributed to vibrations of FedO bonds of
iron oxide in the case of BMO L . The disappearance of certain functional
groups at higher temperatures of 800 and 1000 C is vividly displayed in

the FTIR spectrum of BMO M and BMO H , respectively, clearly showing
the sintering effect. As demonstrated by the spectrum, practically no peaks
1
were observed in the regions above 450 cm and hence the spectrum was
analyzed in the lower wavelength region below 400 cm 1 (Figure 8.5).
Almost all the peaks in BMO L were observed in the far-IR region.