Removal of Anionic Dyes from Aqueous Solutions by Cellulose-Based Adsorbents: Equilibrium, Kinetics, and Thermodynamics

Abstract

A novel cellulose (CE)-based adsorbent was synthesized by polyacrylamide grafted quaternized cellulose (PAM-g-QC) to remove anionic dyes. The elemental analysis results showed that there were abundant amino groups on adsorbents and scanning electron microscopy indicated the structure was porousproperties that were a benefit to increase the adsorption ability. The adsorption ability was specifically investigated in different temperatures. Adsorption isotherms including the Langmuir, Freundlich, and Temkin isotherm models were studied at different temperatures (303−323 K), and the maximum theoretical adsorption capacity of the adsorbents was 380.084 mg g −1 for Congo red (CR) and 349.284 mg g −1 for Eriochrome blue SE (EBSE) at 323 K by the Langmuir isotherm model. The adsorption data was fitted to the adsorption kinetics (pseudo-first-order kinetic, pseudo-secondorder kinetic, and intraparticle diffusion models), and the pseudo-second-order kinetic model showed a better fit for the adsorption of CR and EBSE. Thermodynamic parameters (ΔH o , ΔS o , and ΔG o ) showed that the adsorption of EBSE and CR was feasible, endothermic, and spontaneous from 303 to 323 K. The adsorption and desorption mechanism of CR and EBSE also was investigated in this study, which verified that electrostatic adsorption played a main role between adsorbents and adsorbates. A comparison with other cellulose-based adsorbents confirmed that the CE/PAM-g-QC adsorbent possessed excellent potential and practical value in dye wastewater treatment.

Cellulose Nanofibril/Carbon Nanomaterial Hybrid Aerogels for Adsorption Removal of Cationic and Anionic Organic Dyes

“…CNF-GnP was able to adsorb both cationic MB and anionic CR and yielded higher uptake values compared to recent studies using cellulose, activated carbon, graphene, and CNT-based composites. Polyaniline@GO-multiwalled carbon nanotube nanocomposite 66.67 [44] Nickel nanoparticles/porous carbon-carbon nanotube hybrids 312 [50] Chitosan hydrogel beads impregnated with CNT 450.4 [51] 3D rGO/L-Cys hydrogel 660 [52] Functionalized multiwalled carbon nanotubes 148 [53] Graphene/cellulose nanofibers 227.27 [28] Polyacrylamide grafted quaternized cellulose 349.28 [54] GO/calcium alginate composites 181.81 [55] CaCO 3 −cellulose aerogel 75.81 [56]…”

Efficient Removal of Cationic and Anionic Dyes from Aqueous Solution Using Cellulose-g-p(AA-co-AM) Bio-Adsorbent

“…The pseudo-first-order kinetic model (Eq. 2) (Wang et al 2016) and pseudo-second-order kinetic model (Eq. 3) (Wang et al 2016) were expressed in linear form as follows,…”

“…Yu et al (2016) studied carboxylated cellulose nanocrystals for their use as cationic dye adsorbents. Wang et al (2016) synthesized polyacrylamide grafted quaternized cellulose by an inverse emulsion method, and the product was able to adsorb Eriochrome blue SE and Congo red dyes at the level of 349 mg·g -1 and 380 mg·g -1 , respectively. Moreover, surface quaternized cellulose nonfibrils exhibited good dye adsorption capacity and recyclability (Pei et al 2013).…”

Polyamidoamine‐Based Hydrogel for Removal of Blue and Red Dyes from Wastewater

“…In 2015, Salama et al presented carboxymethyl cellulose‐ g ‐poly(2‐(dimethylamino) ethyl methacrylate) hydrogel as an adsorbent for dye removal . Interesting recent studies about the use of cellulose‐based materials as adsorbents are reported by Wang et al Further, important highlights are described in literature about the use of peptide‐based hydrogels as adsorbents.…”