Adsorption Removal of Dyes from Single and Binary Solutions Using a Cellulose-based Bioadsorbent

Abstract

A high efficiency and eco-friendly porous cellulose-based bioadsorbent was synthesized by grafting acrylic acid and acrylamide to remove anionic dye acid blue 93 (AB93) and cationic dye methylene blue (MB) from single and binary dye solutions. The effects of initial dye concentration, bioadsorbent dosage, contact time, solution pH value, temperature, ionic strength and surfactant content on the adsorption capacity of the bioadsorbent were investigated. The maximum adsorption capacities of the bioadsorbent for both AB93 and MB were 1372 mg g -1 at initial concentration of 2500 mg L -1 . The conditions-dependent adsorption characteristics of the bioadsorbent indicated a high efficiency of dyes removal. The appropriate isotherm model for the equilibrium process was the Freundlich, and the kinetic studies revealed that the adsorption of AB93 and MB followed the pseudo-second-order kinetic models. The adsorbent behaviors were dominated by the electrostatic interactions between the bioadsorbents and the dye molecules. Moreover, the recyclability experiments showed that the bioadsorbent could be reused for at least three cycles with stable adsorption capacity even in complex systems containing binary-dyes, salt and surfactant. Thus, the cellulose-based bioadsorbent can be effectively used for the removal of dyes from industrial textile wastewater.

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

“…3). The raw cotton spectrum exhibited distinctive peaks at 3353,2908,1435,1376,1115,1066, and 896 cm -1 , which were the characteristic peaks of cellulose molecules (Liu et al 2015;Zhang et al 2015). After graft copolymerization modification, the characteristic peak at 3353 cm -1 shifted to a broadened peak at 3426 cm -1 , which was attributed to the N-H stretching vibration and overlapping of O-H bonds.…”

“…In addition, upon comparison with cellulose, the new peaks were found at 1672, 1560, and 1406 cm -1 in the spectrum of CP bio-adsorbent. Thus, the monomers (AA and AM) were successfully grafted onto the cellulose molecular skeleton, which provided more adsorption sites for dye adsorption (Eskandarian et al 2014;Ho et al 2016;Liu et al 2015). Furthermore, according to the chemical titration method (Saito and Isogai 2004;Atia et al 2008), the contents of 5.5 mmol·g -1 for carboxyl groups and 2.7 mmol·g -1 for amino groups were estimated on the CP bio-adsorbent sample.…”

Fabrication of a new metal–organic framework for sensitive sensing of nitroaromatics and efficient dye adsorption

“…The t of the experimental results show that the pseudo-second-order model possesses the highest R 2 value compared to the other adsorption kinetics models. 32,36 Therefore, the results indicate that the adsorption kinetics can be best described by a pseudo-second order model.…”

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

“…33 On the other hand, AAQX is a polyfunctionalized molecule containing alcohol, amine, amide and quinoxaline moieties, which are able to interact with available hydroxyl groups of the cellulose fibers contained in paper via hydrogen bonds, and this fact opened a possibility for immobilizing AAQX on a paper support in attempt to develop a disposable sensor. For decades, the literature has been presenting examples in which hydrogen bonds are the main interaction in the adsorption of polyols, phenols and amines, among other chemical species to cellulose chains, [38][39][40][41][42] strongly suggesting that this type of interaction is involved in the adsorption mechanism of AAQX to the paper strips. One important feature related to AAQX is its low solubility in water, which ensures that the chemosensor remains adsorbed to the paper strip after immersion in aqueous solution.…”