Selective Removal Of Anionic Dyes Research Articles

Highly efficient and selective removal of anionic dyes from aqueous solutions using polyacrylamide/peach gum polysaccharide/attapulgite composite hydrogels with positively charged hybrid network

To avoid the weakness (lower adsorption rate and selectivity) of peach gum polysaccharide (PGP) and improve the adsorption performance of polyacrylamide (PAAm) hydrogel (lower adsorption capacity), in the present work, the PGP was chemically tailored to afford ammoniated PGP (APGP) and quaternized PGP (QPGP), and attapulgite (ATP) was bi-functionalized with cation groups and carbon‑carbon double bond. Then, PAAm/APGP and PAAm/QPGP/ATP hydrogels were synthesized via redox polymerization. The synthesis procedure and properties of hydrogels were traced by FTIR, SEM, XPS, TGA, TEM, and BET methods, and the dye adsorption performance of the hydrogels was evaluated using the new coccine (NC) and tartrazine (TTZ) aqueous solutions as the model anionic dyes. Effects of initial dye concentration, pH, and ionic strength on the adsorption were investigated. Compared with PAAm/APGP hydrogel, PAAm/APGP/ATP hydrogel exhibits higher adsorption rate, superior adsorption capacity, stability, and selectivity towards anionic dye. The adsorption process of PAAm/QPGP/ATP hydrogel reached equilibrium in about 20 min and followed the pseudo-second-order kinetic model and Langmuir isotherm. The adsorption capacities towards NC and TTZ of PAAm/QPGP/ATP hydrogel were calculated as 873.235 and 731.432 mg/g. This hydrogel adsorbent originating from PAAm, PGP, and ATP shows great promise for application in practical water treatment.

Zirconium-Based Nanoscale Metal–Organic Framework with Metal-Bridged Cationic Linkers for the Selective Removal of Anionic Dyes

Zirconium-Based Nanoscale Metal–Organic Framework with Metal-Bridged Cationic Linkers for the Selective Removal of Anionic Dyes

Preparation of amino functionalized magnetic oyster shell powder adsorbent for selective removal of anionic dyes and Pb (II) from wastewater

A kind of new magnetic oyster shell (OS) composite (OS-Fe3O4@SiO2@NH2@PEI) was synthesized and used as an adsorbent to remove carmine (CM), sunset yellow (SY) and Pb (II) from water. Firstly, Fe3O4 magnetic nanoparticles were introduced on the surface of waste oyster shell powder, then amino silanization was used to improve the stability of the material, and finally polyethylenimide (PEI) was grafted by Schiff base reaction. The composite was characterized by FT-IR, SEM, EDS, XPS, VSM, BET, TEM and zeta potential. The effects of adsorbent dosage and initial solution pH on the three samples were investigated by adsorption experiments. The adsorption kinetics and isotherms were investigated in depth under the best experimental conditions. The composite adsorbent not only selectively removed anionic azo dyes, but also had good recycling. In addition, OS-Fe3O4@SiO2@NH2@PEI still had good performance in mixed samples. These results indicated that OS-Fe3O4@SiO2@NH2@PEI was successfully used for the removal of a wide range of anionic dyes and heavy metal ions from the environment, and provided a new strategy for recycling waste.

A sulfonate ligand-defected Zr-based metal-organic framework for the enhanced selective removal of anionic dyes.

In this work, we introduce a novel defective analogue of the representative 6-connected zirconium-based metal-organic framework (MOF-808), by employing 5-sulfoisophthalic acid monosodium salt (H2BTC-SO3Na) as a defect inducer via a mixed-linker approach. The structural integrity and different physicochemical properties were investigated by various characterization techniques, including powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and nitrogen physisorption at 77 K. Additionally, proton nuclear magnetic resonance (1H-NMR), energy-dispersive X-ray (EDX), and inductively coupled plasma optical emission spectroscopy (ICP-OES) were employed to confirm the presence of 6.9 mol% of the 5-sulfoisophthalate ligand within the highly crystalline MOF-808 structure. The defective material exhibited significant enhancements in the removal efficiency of various organic dyes, including approximately 64% and 77% for quinoline yellow and sunset yellow, and 56% and 13% for rhodamine B and malachite green, compared to its pristine counterpart. Importantly, the defective MOF-808 showed a remarkable selectivity toward anionic species in binary-component dyes comprising both anionic and cationic dyes.

Diatomite-Trichoderma viride composite microspheres for selective removal of anionic dyes and copper ions

Taking into account that Trichoderma viride dispersion mycelium existed many shortcomings, such as difficult to separate, easy to deactivate, and low adsorption performance, Diatomite-Trichoderma viride (DE-T. viride) composite microspheres were designed and prepared by chemical bonding, and anion dye and copper ion synergistic removal strategies were proposed. The adsorption performance of the composite microspheres on CR and Cu2+ were demonstrated by Zeta potential and Fourier infrared spectroscopy. The adsorption process followed the pseudo-second-order model, involving various mechanisms such as metal chelation, polysaccharide adhesion, hydrogen bonding, and electrostatic interactions. Intraparticle diffusion model identity that adsorption is controlled by multiple steps. Adsorption isotherms of CR and Cu2+ displayed excellent agreement with the Langmuir, Freundlich, and Temkin models. Impressively, DE-T. viride spheres exhibited maximum adsorption capacities of 176.3 and 63.8 mg/g for CR and Cu2+. Moreover, they displayed selective adsorption for anionic dyes, with capacities 8 and 10 times higher than those for cationic and neutral ionic dyes, respectively. T. viride microspheres generates extracellular polymers, which are rich in a variety of functional groups and can adsorb metal ions through chelation and transport, moreover, it adsorbs anions with positive charge. It is worth mentioning that DE-T. viride spheres exhibited ease of separation, stability, and reproducibility even after multiple adsorption-recycling cycles, maintaining an impressive adsorption rate of 80 %. In conclusion, these multifunctional, efficient, and eco-friendly DE-T. viride spheres present promising potential for environmental remediation, particularly in removing contaminants from various environmental matrices. Their outstanding performance, selectivity, and recyclability make them a valuable and sustainable solution for addressing pollution issues and promoting environmental sustainability.

Schiff base crosslinked graphene/oxidized nanofibrillated cellulose/chitosan foam: An efficient strategy for selective removal of anionic dyes

A versatile foam based on Schiff base crosslinking of oxidized nanofibrillated cellulose (ONFC) with amino modified graphene oxide (NGO) and chitosan (CS) was prepared for the efficacious selective removal of anionic dyes. (3-aminopropyl) triethoxysilane (APTES) was employed as a surface modifier to yield an amino modified graphene oxide (NGO). Meanwhile, ONFC was obtained via a periodate oxidation process to produce dialdehyde groups. Thus, the Schiff base crosslinking of ONFC with NGO and CS enabled to be readily accomplished, producing a versatile NGO/ONFC/CS foam. Systematical characterizations confirmed the successful covalent crosslinking and formation of NGO/ONFC/CS foams. Selective adsorption of Allura Red (AR) and orange G (OG) over cationic dye methylene blue (MB) by NGO/ONFC/CS was confirmed. It was found the maximum adsorption capacities of AR and OG at 303 K were 416.7 and 300.5 mg g−1, while it was 14.60 mg g−1 for MB. Thus, the new Schiff base crosslinked NGO/ONFC/CS paves the way for developing versatile graphene based foams in the applications of water treatment.

Hybrid lignin particles via ion-crosslinked for selective removal of anionic dyes from water

Hybrid lignin (HL) particles were synthesized by compounding lignosulfonate and carboxylated chitosan through a simple ionic cross-linking method, and modifying by polyvinylpolyamine. Due to the synergistic effect of recombination and modification, the material exhibits excellent adsorption performance for anionic dyes in water. The structural characteristics and adsorptive behavior were systematically investigated. The pseudo-second-order kinetic model and the Langmuir model were revealed to well describe the sorption procedure of HL for anionic dyes. The results exhibited that the sorption capacities of HL on sodium indigo disulfonate and tartrazine were 1099.01 mg/g and 436.68 mg/g, respectively. Simultaneously, the adsorbent behaved no significant adsorption capacity loss after five adsorption-desorption cycles, indicating its superb stability and recyclability. Additionally, the HL exhibited excellent selective adsorption of anionic dyes form binary dye adsorption systems. The interaction forces between adsorbent and dye molecules, such as hydrogen bonding, π-π stacking, electrostatic attraction and cation bonding bridge, are discussed in detail. The facile preparation process and superior dyes removal performance of HL were considered a potential adsorbent to remove anionic dyes from wastewater.

Highly efficient and selective removal of anionic dyes from aqueous solutions using magneto-responsive Fe-aminoclay/Fe2O3/polyvinyl alcohol composite microgels

In this study, magneto-responsive iron-aminoclay/iron oxide/polyvinyl alcohol (Fe-AC/Fe2O3/PVA) composite microgels were successfully fabricated via a Schiff-base and acetalization reactions using a microfluidic approach. The as-prepared Fe-AC/Fe2O3/PVA composite microgels were used as adsorbents to remove organic dyes from aqueous solutions. The chemical cross-linking and morphology of the prepared microgel particles were evaluated using Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, optical microscopy, Brunauer–Emmett–Teller surface area analysis, and scanning electron microscopy. The Fe-AC/Fe2O3/PVA microgels served as an effective adsorbent by exhibiting a remarkable adsorption capacity for anionic dyes such as methyl orange (MO), Congo red (CR), and methyl blue (MB) owing to their fast diffusion kinetics, porous structures, and numerous amino groups. The microgels had maximum adsorption capacities of 457.31 mg/g for MO, 352.88 mg/g for CR, and 566.98 mg/g for MB. The prepared microgels were systematically evaluated for their adsorption behavior toward the anionic dyes from aqueous solutions at various process parameters, such as pH, contact time, and dye concentration. The adsorption process for the anionic dyes fitted well with the pseudo-second-order kinetic model and Sips isotherm model, verifying that the sorption process was mainly governed by chemisorption. Furthermore, the Fe2O3 magnetic nanoparticle incorporation made it simple to separate the microgels from the aqueous solutions and reuse them. The microgels maintained an adsorption efficiency of above 80 % even after five adsorption–desorption cycles. These results demonstrate that the magneto-responsive Fe-AC/Fe2O3/PVA hybrid microgels are an effective and sustainable adsorbent for treating wastewater contaminated with anionic dyes.

A Triazine-Based Cationic Covalent Organic Framework as a Robust Adsorbent for Removal of Methyl Orange

In comparison with neutral covalent organic frameworks (COFs), few studies have been conducted on the synthesis and applications of ionic COFs. In this work, a novel cationic covalent organic framework (CCOF) with high porosity and crystallinity is synthesized by reacting ionic tris-aldehyde with 4,4'-oxydianiline through the catalyst-free Schiff’s base reaction. The structural properties of cationic COF were characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HR-TEM), Atomic force microscopy (AFM), thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) surface area analysis. Application of this cationic COF as an adsorbent for selective removal of anionic dyes with sustainability concerns is investigated. The synthesized cationic COF exhibited good removal efficiency (95%) for methyl orange. The adsorption process was exothermic and fitted perfectly with the Langmuir isotherm with a high correlation coefficient (R 2 = 0.9737) and maximum adsorption capacity (196.08 mg/g) and pseudo-second-order kinetic model.

Facile synthesis of high-efficiency magnetic graphitic carbon nitride adsorbents for the selective removal of hazardous anionic dyes in wastewater

In this study, a kind of novel magnetic composite, PEI-Fe3O4/g-C3N4, was synthesized by simple physical impregnation and used as an adsorbent to remove the anionic dye Congo red (CR) in water. The structural properties of composites were studied using Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometry (VSM), Brunauer-Emmett-Teller (BET) measurements and zeta potential techniques. PEI-Fe3O4/g-C3N4 could selectively remove anionic dyes from aqueous solutions. The adsorption kinetics and isotherms were systematically studied, and the adsorption process is in accordance with the pseudo-second-order kinetic model and Langmuir isotherm model. The thermodynamic results indicated that adsorption is a process of spontaneous heat entropy increase. CR-sorbed PEI-Fe3O4/g-C3N4 was successfully desorbed with a NaOH solution, and 0.05 M NaOH had the best desorption effect. Furthermore, PEI-Fe3O4/g-C3N4 exhibited excellent recyclability and reusability. The results of the adsorption mechanism study indicated that the excellent adsorption performance of PEI-Fe3O4/g-C3N4 was attributed to the favorable electrostatic interaction, hydrogen bonding and π-π interactions between the adsorbent and CR. In addition to its excellent adsorption properties, the prepared adsorbent showed satisfied adsorption performance in actual water samples. Predictably, the prepared adsorbent has a potential application value in the environmental field.

Selective Removal of Anionic Dyes by Metal–Organic Framework-Anchored CoAl-Layered Double Hydroxide Nanosheets

A copper terephthalate metal organic framework-anchored CoAl-layered double hydroxide nanocomposite [CoAl-LDH/Cu-(tpa) MOF] was synthesized by in situ nucleation and growth of crystalline Cu-(tpa) ...

Highly efficient and selective removal of anionic dyes from water using a cellulose nanofibril/chitosan sponge prepared by dehydrothermal treatment

To obtain cost-effective and environmentally friendly adsorbents that can selectively remove anionic dyes from wastewater, a physically cross-linked cellulose nanofibril/chitosan (CNF/CS) sponge was developed by dehydrothermal treatment (DHT). The physicochemical properties of the prepared sponge were determined by various techniques, and its adsorption performance was evaluated using reactive blue 221 (RB) as the model dye. Batch adsorption experiments reveal that the capacity of RB adsorption on the sponge increases up to 778.5 mg/g with increasing temperature. This value is greater than the maximum adsorption capacities of all other non-conventional adsorbents reported in the literature. Based on kinetic and thermodynamic assessments, the RB adsorption process is best described by pseudo-second-order kinetics and the Langmuir model, which suggests that it is actually an endothermic monolayer chemisorption process. The RB removal efficiency reaches 99.64% after five repeated continuous separations and the CNF/CS sponge can be efficiently used in five adsorption-desorption cycles. Overall, the results reported in this study indicate that the novel CNF/CS sponge developed in this study has great potential for use in applications of dye removal from wastewater.

Selective removal of anionic dyes in single and binary system using Zirconium and iminodiacetic acid modified magnetic peanut husk.

A novel adsorbent (PN-Fe3O4-IDA-Zr) was developed from the chemical modification of peanut husk (a low cost material) with Fe3O4, iminodiacetic acid (IDA) and zirconium (Zr) and its efficacy for the sequestration of wastewater assessed using Alizarin red (AR) and Acid chrome blue K (AK) as model pollutants. To elucidate the characteristics of the formed adsorbent, analytical techniques such as the Bruauner-Emmet-Teller (BET) method, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffractive spectroscopy (XRD) and vibrating sample magnetometer (VSM) were applied. Results from these studies confirmed the formation of a crystalline mesoporous adsorbent with surface properties which enhanced its usefulness. From the adsorption studies, it was observed that factors such as pH, salts, temperature and contact time influenced the uptake of the anionic dyes. The maximum monolayer capacity of PN-Fe3O4-IDA-Zr for AR was 49.4 mg g-1 (at 313 K) and was well fitted by the Langmuir model with the chemisorption process being the dominant reaction mechanism. In binary systems, PN-Fe3O4-IDA-Zr exhibited higher affinity for AR as compared with AK. The significant removal efficiency exhibited by this novel adsorbent as well as other unique features such as easy retrieval and high regeneration promotes its prospects as an adsorbent for practical wastewater remediation processes.

Terephthalaldehyde as a good crosslinking agent in crosslinked chitosan hydrogel for the selective removal of anionic dyes

This work reports the selectivity and good adsorption performance for the removal of anionic dyes using an ultrasonic-synthesized terephthalaldehyde crosslinked chitosan hydrogel.

Surfactant Encapsulated Iron (III) Coordinated Phosphomolybdate Hybrid: A Novel Adsorbent for the Selective Removal of Anionic Dyes

AbstractIn this work, Keggin type phosphomolybdate inorganic‐organic hybrid material coordinated to with iron was synthesized by hydrothermal process followed by precipitation with organic cation. The prepared hybrid was fully characterized using conventional spectroscopic techniques. The adsorption efficiencies of the hybrid were evaluated for the removal of both anionic and cationic dyes from aqueous solutions. From the studies, it was concluded that hybrid has high adsorption as well as high selectivity for anionic dyes than cationic dyes. The results from the adsorption experiments revealed that the hybrid have specific methyl orange dye removal efficiency ≥96 % for 20 mgL−1 concentration. The reaction kinetics and adsorption isotherm also discussed.

Highly efficient and selective removal of anionic dyes from aqueous solution by using a protonated metal-organic framework

Hydrothermal reaction of Zn(NO3)2·6H2O with a flexible bipyridyl ligand, (pyridin-4-yl)methyl 3-(2-(4-((pyridin-4-yl)methoxy)phenyl)diazenyl)benzoate (L) and 1,3-benzenedicarboxylic acid (1,3-H2BDC) gave rise to a novel metal-organic framework (MOF), {[Zn (1,3-BDC)L]∙H2O}n. The as-synthesized MOF has been characterized by Fourier transformed infrared (FT-IR), powder X-ray diffraction, single-crystal X-ray diffraction and scanning electron microscopy (SEM). By introduction of the ligand L containing ester, diazene and ether groups, a large number of oxygen and nitrogen sites that can be readily protonated in acidic conditions were successfully decorated on the surfaces of the predesigned MOF. The as-prepared protonated Zn-MOF with abundant positive charges (−NNH+−, –OH+−, –COOH+−) was applied as an adsorbent to remove anionic dyes from aqueous solutions. Such an adsorbent exhibited ultrahigh uptake capacities for different sized anionic dyes of Amido Black 10 B (AB, 2402.82 mg g−1), Methyl Orange (MO, 744.02 mg g−1), Orange ΙΙ (OII, 522.83 mg g−1) and Direct Red 80 (DR, 1496.34 mg g−1). The anionic dyes uptakes of the adsorbent are obviously higher than that of most reported adsorbents. Moreover, the adsorbent showed excellent selectivity in the adsorption of anionic dyes. The adsorption process followed the pseudo-second-order kinetics. The equilibrium adsorption isotherm data were well fitted by Langmuir and Sips models. FT-IR, zeta potential analysis and SEM investigation revealed that the interactions between the protonated Zn-MOF and the anionic dyes are mainly dominated by electrostatic interaction and surface adsorption. This work may provide a new perspective for the development of functional materials on the removal of contaminants from water environment.

Fast and environmental-friendly approach towards uniform hydrogel particles with ultrahigh and selective removal of anionic dyes

Based on the strategy of copolymerization, methacrylatoethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) copolymer hydrogel particles (PCM HPs) were prepared by precipitated droplets in-situ cross-linking polymerization, to overcome the easily fragile property of pure PDMC HPs and the low adsorption capacity of pure PAM HPs. Corn oil and deionized water were used for the reaction, which would not cause any pollutions; and the preparation process only took 40 s. Through the studies on various feeding ratios of DMC to AM, the hydrogel particles (PCM5-1 HPs) with the mass ratio of 5:1, showed the best mechanical strength and adsorption capacity. The compression strength of the PCM5-1 HPs was 207.7 K Pa, and no obvious mechanical loss occurred during five compression-rebound cycles. In addition, the removal ratios of anionic dyes such as amaranth red, orange G, and methyl orange were all higher than 94% (the initial dye concentration was 100 μmol/L and the adsorbent mass was 4 mg); and the adsorption capacity of orange G could reach as high as 992.63 mg/g. Meanwhile, the PCM5-1 HPs exhibited excellent selective adsorption of anionic dyes in mixed dye solutions. Therefore, the hydrogel particles prepared by the fast and environmental-friendly method had both mechanical strength and ultrahigh adsorption capacity, which verified their practicality in the removal of anionic dyes in sewage.

One-pot synthesis of hierarchical porous covalent organic frameworks and two-dimensional nanomaterials for selective removal of anionic dyes

Abstract Covalent organic frameworks (COFs) are new generation of porous materials constructed from light elements (such as carbon, oxygen and nitrogen) linked via covalent bonds. Herein, one-pot synthesis of the composite of a COF and two-dimensional (2D) nanomaterials (graphene oxide (GO), graphitic carbon nitride (g-C3N4), and boron nitride (BN)) was reported. Melamine is poly-condensed with terephthaldehyde in the presence of GO, g-C3N4, and BN leading to the formation of a series of highly cross-linked microporous hierarchical porous amine networks. The thermal behavior, surface morphology, and crystalline structure were studied using thermogravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The prepared COF nanocomposites possessed a high surface area of 42-509 m2 g−1 with a hierarchical porous structure and high thermal stability. COF nanocomposites (COF@GO, COF@g-C3N4, and COF@BN) were explored as an adsorbent for dye removal anionic dyes (Eosin dye and fluorescein) and cationic dyes (Fuchsine, and methylene blue). The composite materials exhibit high adsorption efficiency of 100% with excellent selectivity compared to the pristine COF. The synergic effect of COF and 2D nanomaterials improves the adsorption performance of the materials.

Facile synthesis of mesoporous magnesium oxide–graphene oxide composite for efficient and highly selective adsorption of hazardous anionic dyes

Mesoporous magnesium oxide–graphene oxide composite (MGC) has been synthesized using a facile post-immobilization method by mixing pre-synthesized magnesium oxide (MgO) with graphene oxide (GO). MgO used for fabrication of the composite has been synthesized using an environment-friendly method involving gelatin as a template. XRD, Raman and EDX analyses have confirmed the presence of MgO and GO in the composite. FTIR and SEM analyses of synthesized MGC have further elucidated the surface functionalities and morphology, respectively. Using N2 adsorption–desorption isotherm, BET surface area of MGC has been calculated to be 55.9 m2 g−1 and BJH analysis confirmed the mesoporous nature of MGC. The application of synthesized MGC as a selective adsorbent for various toxic anionic dyes has been explored. Batch adsorption studies have been carried out to investigate the influence of different adsorption parameters on the adsorption of two anionic dyes: indigo carmine (IC) and orange G (OG). The maximum adsorption capacities exhibited by MGC for IC and OG are 252.4 and 24.5 mg g−1, respectively. Plausible mechanism of dye adsorption has been explained in detail using FTIR analysis. In a mixture of cationic and anionic dyes, MGC selectively adsorbs anionic dyes with high separation factors, while in binary mixtures of anionic dyes, both dyes are adsorbed efficiently. Thus, MGC has been shown to be a potential adsorbent for the selective removal of anionic dyes from wastewater.

Self-Sustainable, self-healable, Load Bearable and Moldable stimuli responsive ionogel for the Selective Removal of Anionic Dyes from aqueous medium

Among the tested strategies to remove the toxic dyes from the aquatic environment, absorption is widely preferred owing to its ease of formation, lower cost and modulating ability of the absorbents used. Designing advance absorbents that offer higher absorptivity, selectivity, reusability, moldability and high pre-concentration factor for the analyst is a challenging task yet to be achieved. Herein, we had designed new age low molecular weight gelator from prototypical molecular gelators, an ionic liquid based gelator; 1-n-hexadecyloxy-carbonylmethylpyridinium bromide (C16EPyrBr) that exhibited unusual, unprecedented stimuli responsive reversible transition from opaque to transparent ionogel due to the change in the gel microstructure from lamellar for the opaque ionogel to cylindrical for the transparent ionogel. Small angle neutron scattering and scanning and scanning electron microscopy measurements characterized the microstructure and morphology of the ionogel respectively. Although having lower molecular weight based, the ionogel show excellent tolerance against the salinity (1500 mM concentration of NaCl), offer good mechanical strength and have self-healing, self-sustaining, and load bearing characteristics. The ionogel could be loaded in apparatus like dialysis membrane and syringe with 99% removal efficiency and can selectively remove the anionic dye, methyl orange from the aqueous medium even after 20 cycles. As a final thought, the low molecular weight ionic liquid based gelator could be a promising alternative to the traditional anionic dye absorbents.