Facile Removal of Methylene Blue Using Carboxymethyl Cellulose Grafted Polyacrylamide/Carbon Black Nanocomposite Hydrogel

Carboxymethyl Cellulose/Polyacrylamide/Fe3O4 Magnetic Ion Imprinting Biosorbent for Removal and Recovery of La3+

“… 27 , 28 To CMC, there are three adsorption bands: the first band at 3200–3400 cm –1 is the O–H vibration; the second band is the C=O vibration at 1600 cm –1 , which has a red-shift due to the strong coupling effect; and the third band located at 1100 cm –1 is the C–O–C vibration. 29 Since there are plenty of C–O–C groups in the CMC, this band is relatively stronger. Following the crosslinking of CMC and PAM to form the composite of CPF, the IR spectrum shows functional groups of both CMC and PAM: the peaks at 3658 and 3344 cm –1 are attributed to the N–H and O–H stretching vibrations and the peaks at 1716 and 1655 cm –1 are attributed to the vibration of C=O.…”

“…The Fourier transform infrared (FTIR) spectra of CMC, PAM, and CPF are shown in Figure a. From the FTIR spectrum of PAM, one can see that peaks at 3319 and 3186 cm –1 are associated with N–H vibrations and peaks at 1662 and 1396 cm –1 are associated with CO and C–N stretching vibrations. , To CMC, there are three adsorption bands: the first band at 3200–3400 cm –1 is the O–H vibration; the second band is the CO vibration at 1600 cm –1 , which has a red-shift due to the strong coupling effect; and the third band located at 1100 cm –1 is the C–O–C vibration . Since there are plenty of C–O–C groups in the CMC, this band is relatively stronger.…”

Eco-Friendly Semi-Interpenetrating Polymer Network Hydrogels of Sodium Carboxymethyl Cellulose/Gelatin for Methylene Blue Removal

“…The reason behind this may reside in that there are numerous adsorption sites available on the adsorbent at low concentrations. As the concentration of the initial MB solution heightens continuously, the adsorbent will occupy more adsorbed mass per unit mass as the competi-tion for adsorption sites becomes more intense [40]. Nonetheless, the removal ratio will exhibit a decreasing trend.…”