Chitosan-edible oil based materials as upgraded adsorbents for textile dyes

Potential of Cellulose Functionalized with Carboxylic Acid as Biosorbent for the Removal of Cationic Dyes in Aqueous Solution

“…Also, analysis shows that the experimentally obtained value of the amount adsorbed per gram of adsorbent, q e , exp , when compared to the values calculated by the equations of the kinetic models, q e,cal , indicates that for pseudo-first-order there is a small discrepancy observing adsorption of CV or MB using adsorbent matrices. Thus, the pseudo-first-order model, indicating that diffusion through a boundary precedes the adsorption, is most appropriate to describe the kinetic behavior of the adsorption systems discussed, as has been observed in systems similar to these [ 32 ]. Figures S4 and S5 show the adsorption isotherms obtained experimentally, where we observe the temperature does not significantly influence the adsorption of the dye CV ( Figure S4 ) and/or MB ( Figure S5 ) on adsorbent matrices (Cel or PhCel) at temperatures of 298, 308 and 318 K, as observed in similar systems to these [ 6 , 7 ].…”

“…The amount of dye retained, q e (mg g −1 ) in the adsorbent, for each time, was calculated using Equation (3). The results showed the times required to achieve the maximum adsorption of the adsorbents used [ 32 , 41 , 42 ]. The experimental data were studied with pseudo-first-order [ 29 ], pseudo-second-order [ 30 ] and Elovich [ 31 ] equations to verify the kinect of the adsorption process.…”

Amine Resin by Chromium (III)‐Fibrous Protein for Enhanced Removal of Two Reactive Anionic Dyes

“…Obviously, both the curves of X‐3B and K‐2BP adsorbed by ACrFP exhibited a similar tendency that the removal percent kept above 90% below pH 9.0 but dropped gradually when pH value was beyond 9.0. It was known that the adsorption of a positively charged adsorbate was favored when the pH of the solution was greater than its pHpzc, whereas the adsorption of negative charges, in turn, was favored at pH levels less than pHpzc . Thus, the solution with lower pH produced more amine groups protonation (NH 2 + ) on the surface of ACrFP.…”

“…In spectra of CrFP, the sharp peaks at1535 cm −1 and 1240 cm −1 belonged to CONH amide II and C N stretching of amide III, respectively [25], and the bands observed between 1466 and 1600 cm −1 were typical subtle structure of aminophenol, peak at 1081 cm −1 was attributed hydroxyl group of Cr(III) oxide [25,26]. For ACrFP, the wide peak around 3385-3428 cm −1 illustrated the appearance of amine groups [18], bands at 2946-2954 cm −1 were symmetric vibration of CH 2 , and the bands of 1647-1654 cm −1 were stretching vibration of COO, C O, C N (amide I) peptidic bond of proteins [25][26][27]. In addition, the new band at 1336 cm −1 representing C N stretching indicated the insertion of amine groups onto CrFP backbone, and new strong adsorption band in the region of 1040-1100 cm −1 corresponded to the COC group vibrations [28].…”

Synthesis, Characterization and Flux Evaluation of Chitosan tri-polyphosphate Membrane and Chitosan/tri-polyphosphate Membrane Impregnated with Zinc Oxide Nanoparticles

“…Recently, research into membrane synthesis from natural polymers has been carried out, looking at, for example, membranes made from cellulose [10], poly-eugenol [11] and chitosan [12,13]. Chitosan is one of the natural polymers which is often used to create membranes, because it is proven to be a good adsorbent of metal compounds [14] and dyes [15,16]. Chitosan is a natural polymer created through the deacetylation of chitin, usually sourced from shrimp or crab skin [17].…”