Synthesis and application of a new carboxylated cellulose derivative. Part III: Removal of auramine-O and safranin-T from mono- and bi-component spiked aqueous solutions

Abstract

In the third part of this series of studies, the adsorption of the basic textile dyes auramine-O (AO) and safranin-T (ST) on a carboxylated cellulose derivative (CTA) were evaluated in mono- and bi-component spiked aqueous solutions. Adsorption studies were developed as a function of solution pH, contact time, and initial dye concentration. Adsorption kinetic data were modeled by monocomponent kinetic models of pseudo-first- (PFO), pseudo-second-order (PSO), intraparticle diffusion, and Boyd, while the competitive kinetic model of Corsel was used to model bicomponent kinetic data. Monocomponent adsorption equilibrium data were modeled by the Langmuir, Sips, Fowler-Guggenhein, Hill de-Boer, and Konda models, while the IAST and RAST models were used to model bicomponent equilibrium data. Monocomponent maximum adsorption capacities for AO and ST at pH 4.5 were 2.841 and 3.691 mmol g, and at pH 7.0 were 5.443 and 4.074 mmol g, respectively. Bicomponent maximum adsorption capacities for AO and ST at pH 7.0 were 1.230 and 3.728 mmol g. Adsorption enthalpy changes (ΔH) were obtained using isothermal titration calorimetry. The values of ΔH ranged from -18.83 to -5.60 kJ mol, suggesting that physisorption controlled the adsorption process. Desorption and re-adsorption of CTA was also evaluated.

Equilibrium studies on the uptake of nitrate and phosphate ion onto low-cost adsorbent prepared via radiation-induced graft polymerization and hydrazine hydrate functionalization

“…However, their lack of thermo-plasticity, poor dimensional stability and poor crease-resistance retard their adsorption performance properties [23]. These properties can be improved by subjecting the cellulosic fabric to different chemical modifications for example grafting of different monomers to the cellulosic chain or etherification reaction [24][25][26][27][28][29][30][31][32]. Other performance properties, like thermal stability and resistance to biological and chemical agents, can also be improved through chemical modification and consequently applied as an absorbent in wastewater purification [33][34][35][36][37][38], ion-exchangers for the removal of metal cations from aqueous solutions [39][40][41][42][43][44], etc.…”

A Bi2WO6/Ag2S/ZnS Z-scheme heterojunction photocatalyst with enhanced visible-light photoactivity towards the degradation of multiple dye pollutants

“…4 Auramine-O is a basic dye that is used to dye wool, silk, acrylic bers, and leather in the textile industries; however its presence in water source causes acute oral toxicity, carcinogenicity, cytotoxicity, DNA damage, genotoxicity, and mutagenicity. 5 Furthermore, triphenylmethane dyes, which are used as colorants and antimicrobial agents in diverse industries, are also known as organic water pollutants. 6 Triphenylmethane dyes are used extensively in the textile industry for dyeing nylon, wool, cotton, and silk, as well as for coloring oil, fats, waxes, varnish, and plastics.…”

“…33 Investigations have revealed that metallic Ag could improve the transfer capability of photo-generated electron-hole pairs of the Ag 3 PO 4 / BiVO 4 composite. 34 Furthermore, investigations indicated that metallic Ag has an undeniable role in the charge separation promotion and photoactivity enhancement for the construction of ternary heterojunctions including Ag@g-C 3 N 4 @BiVO 4 [5] 37 These heterojunction photocatalysts enhance the photo-excited carrier separation related to the undeniable role of Ag, which can induce localized surface plasmon resonance. Consequently, these Ag-Bi-based photocatalysts not only improve the rate of the electron-hole pair generation but also expand the visible light-responsive range.…”

Preparation of a Stable Nanoscale Manganese Residue-Derived FeS@Starch-Derived Carbon Composite for the Adsorption of Safranine T

“…Safranine T (ST), a typical kind of cationic azine dye, is one of the most commonly used organic dyes. ST is widely used as textile colorant for dyeing tannin, cotton, bast fibers, wool, silk, leather, and paper [23,24]. Therefore, ST was chosen to study the adsorption properties of MR–FeS@SC nanocomposite.…”