Cationic Dyes In Aqueous Solution Research Articles

Simultaneous and ultrafast removal of anionic and cationic dyes from aqueous solution by Zr-based MOFs hybridized by attapulgite and adsorption performance research

Zr-based MOFs hybridized by attapulgite (APT) were successfully prepared by simple reflux method and characterized by FTIR, BET, XRD, TGA and XPS. Both cationic and anionic dyes were efficiently, quickly and simultaneously adsorbed by UiO-66, 1%APT/UiO-66 and 5%APT/UiO-66 in 5 min. In anionic dyes (Congo red and alizarin yellow GG) and cationic dye methylene blue, adsorption capacities of UiO-66, 1%APT/UiO-66 and 5%APT/UiO-66 for Congo red were higher, 304.07, 585.00 and 394.63 mg/g, respectively. Capillary effect was adopted to explain characteristic trend of adsorption kinetic curves (first decrease and then increase of adsorption capacity in the second stage). Pseudosecond-order kinetic model and Langmuir isotherm was the best-fit model to evaluate adsorption behaviors of UiO-66, 1%APT/UiO-66 and 5%APT/UiO-66 for adsorption of Congo red. It was more favorable and effective for prepared materials to removal Congo red from solutions containing inorganic salts. When concentration of NaCl was 0.09 mol/L, adsorption capacities of 1%APT/UiO-66 were increased to 589.77, 724.56 and 635.59 mg/g, accordingly. UiO-66, 1%APT/UiO-66 and 5%APT/UiO-66 exhibited good stability and reusability. Main adsorption driving forces were hydrogen bonding interactions, π-π conjugations, electrostatic interactions and sieving effects, and adsorption driving forces of 1%APT/UiO-66 were largest. Above results indicated that UiO-66 hybridized by APT could simultaneous and ultrafast removal of anionic and cationic dyes in aqueous solution, and were potential adsorbents in practical application.

Propensity of a low-cost adsorbent derived from agricultural wastes to interact with cationic dyes in aqueous solutions.

Ash collected from thrown-away by-products while preparing a popular traditional food additive, kolakhar of the Assamese community of North East, India, was used as an alternate cost-effective, porous bioadsorbent option from the conventional activated carbon for the purification of carcinogenic dyes laden water. The base material for kolakhar preparation was taken from the discarded banana stem waste to stimulate agricultural waste management. Methylene blue (MB) and basic fuchsin (BF) dyes were used as model cationic dyes. Characterization techniques like CHN, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission-scanning electron microscope (FE-SEM), energy dispersive X-ray (EDX), and Brunauer-Emmett-Teller (BET) analysis of the prepared banana stem ash (BSA) reveal the presence of high inorganic contents and functional groups in the irregular, porous bioadsorbent with surface area 55.534 m2g-1. Various regulating parameters studied to optimize the adsorption capacity of BSA were bioadsorbent dose (0.1-3g/L), temperature (298-318K), contact time (0-150min), pH (2-9), and initial dye concentrations (10-40mg/L). Non-linear kinetic models suggested Elovich for both MB and BF adsorption, while the non-linear isotherm model suggested Langmuir and Temkin for MB and BF adsorption, respectively, as best-fitted curves. The monolayer adsorption capacity (qm) for MB and BF was 15.22mg/g and 24.08mg/g at 318K, respectively, with more than 95% removal efficiency for both dyes. The thermodynamic parameters studied indicated that the adsorption is spontaneous. The ∆H0 values of MB and BF adsorptions were 2.303kJ/mol (endothermic) and - 29.238kJ/mol (exothermic), respectively.

Adsorption of anionic and cationic dyes in aqueous solution by a sustainable and low-cost activated carbon based on argan solid waste treated with H3PO4.

The objective of this work is to study the adsorption capacity of a natural and low-cost material prepared from argan waste treated with H3PO4 towards two dyes of different molecular charges and presenting an acute toxicity, the methyl orange (MO, anionic dye) and the methylene blue (MB, cationic dye). The prepared adsorbent was characterized by SEM, EDX, FTIR, and BET specific surface. These analyses showed the presence of C (42%), O (55%), and P (3%) and a remarkable difference between the morphology of the precursor and that of the obtained material with a specific surface of 475 m2/g and a very porous structure as well as the main functional groups, O-H, C=O, and C-H. The influence of the pH showed a maximum adsorption at pH =2 for MO and at pH = 10 for MB. Investigation of the effect of time on the adsorption of anionic and cationic dyes revealed that the contact time at equilibrium was 240 and 180 min, respectively. The isotherms that best fit the adsorption of MO and MB are the Langmuir model and the Freundlich model respectively. The kinetic study showed that the experimental data are in agreement with the pseudo-second-order model. Regeneration of the saturated material was also studied for the probability of reusing the adsorbent in many experiments. The valorization of argan waste into activated carbon using H3PO4 has allowed to obtain an effective adsorbent for the removal of anionic and cationic dyes and create an added value for environmental sustainability.

Sustainable and rapid pillared clay synthesis with applications in removal of anionic and cationic dyes

Adsorbents that remove both anionic and cationic dyes in aqueous solutions are essential in wastewater treatment. To address this need, chromium metal polycations are intercalated in bentonite clay and the efficacy of the resulting adsorbent for anionic as well as cationic dyes removal are explored in this study. The problems to be addressed are ensuring permanent porosity in the raw clay which tends to swell upon contact with water, and identifying optimal conditions for high capacity of the adsorbent. Further the time-consuming steps involved in preparation of the pillaring solution and its intercalation in the clay need to be expedited. Pillared clays with different chromium contents were synthesized using an economical and sustainable method. Ultrasonication at 35 kHz frequency intensified chromium polycations synthesis and their intercalation into the clay by reducing the time from 24 h to 40 min. Cr pillared clays with high basal spacing, surface area, total pore volume, and micropore volume were synthesized. The residual Cr polycations solution after intercalation could be reused in two additional stages, minimizing the disposal of spent Cr solution into the environment. The pillared clay's point of zero charge was reduced considerably with increasing Cr content while the basal spacing increased. Cr was stable in calcined pillared clay matrix and was non leaching. Cationic Basic Orange 2 dye and anionic Acid Blue 74 dye was used for adsorption studies with Cr pillared clays. Effects of dosage, pH, initial concentration of the dyes, and temperature on the adsorbent loading were analyzed. The maximum adsorbent loading for Acid Blue 74 and Basic Orange 2 dyes were 81 mg/g and 170.9 mg/g respectively. Gibbs free energy, enthalpy and entropy changes were estimated. Cr pillared clay adsorbents could successfully adsorb both cationic and anionic dyes. Ultrasound accelerated the Basic Orange 2 dye desorption time from the clay by 48 times and enabled its reuse over four more cycles without an appreciable drop in capacity. Basic Orange 2 dye could still adsorb on pillared clay which was permanently saturated with Acid Blue 74 dye. The ultrasound aided rapid chromium pillared clay adsorbent synthesis process proposed in this study enables the reuse of the intercalating solution over three cycles without discharge into the environment and led to a non-leachable as well as reusable adsorbent. This adsorbent had adjustable point of zero charge depending on its chromium content and revealed a high capacity for anionic as well as cationic dyes.

Synthesis of hollow mesoporous manganese dioxide nanoadsorbents with strong negative charge and their ultra-efficient adsorption for cationic dyes

The efficient removal of organic dyes has important practical significance for environmental protection and human health. Chemical modification and composite materials are the main design strategies for high-performance nanoadsorbents. In this work, taking unmodified hollow mesoporous manganese dioxide (H-MnO2) as an example, its adsorption performance for organic dyes was explored through the morphological design of common adsorbents. Unmodified H-MnO2 with strong negative charge which has good stability under acidic conditions was directly used as nanoadsorbent for the removal of cationic dyes in aqueous solutions. The adsorption capacity of H-MnO2 for crystal violet (CV) reached 3707.3 mg g−1, and such a high adsorption capacity has not been reported. Its adsorption capacity for methylene blue (MB) was 1274.9 mg g−1, which is also at the current high level. In addition, the removal rate of low concentration CV and MB by H-MnO2 can reach 95% (CV with the concentration of 450 mg L-1, MB with the concentration of 200 mg L-1). Through the structural design of common manganese dioxide adsorption material, its dye adsorption performance has been greatly improved. This will provide new insights for the subsequent design and preparation of nanoadsorbents.

Organophilicized Bentonite for Adsorptive Removal of Methylene Blue (MB) Dye in Aqueous Medium: Thermodynamics, Kinetics and Equilibrium Studies

HDTMA and TMPA cations intercalated bentonite clay has been assessed for the effective removal of methylene blue dye (MB) in aqueous solution. The adsorbents has been characterized by Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and x-ray diffraction (XRD). Various sorption parameters like effect of initial MB concentration, contact time and pH were used to investigate the sorption process. Langmuir and Freundlich isotherms as well as Pseudo First order, Pseudo Second order and intraparticle diffusion kinetic models were applied to investigate the sorption mechanisms. Results from the adsorption experiment confirmed 180 minutes as equilibrium time for maximum sorption of MB by both organoclays. Increase in initial MB concentration resulted to a corresponding increase in the adsorption capacities of both organoclays. Adsorption of MB by the organoclays were highly influenced by pH, as maximum sorption of MB was achieved at pH of 7. Among the isotherm and kinetic models exploited, the Langmuir isotherm and Pseudo second order kinetic model gave best fit to the experimental data respectively. Results from thermodynamic studies showed that the process of adsorption of MB onto the organoclays were feasible, spontaneous and exothermic; and successful reapplication of regenerated spent organoclays (Bt-HDTMA and Bt-TMPA) yielded MB dye removal percentage of 89.6 and 85.3% respectively at 60 minutes contact time. Therefore, the results obtained from the entire study confirms the efficacy of HDTMA and TMPA intercalated bentonite clay for effective removal of cationic dyes in aqueous solution at optimal experimental conditions

Polydopamine functionalized superhydrophilic coconut shells biomass carbon for selective cationic dye methylene blue adsorption

Environmentally benign, high adsorption efficiency and high selectivity adsorbents are satisfied real demand in wastewater treatment. Coconut shell (CS), the agricultural and forestry biomass was applied to further modified with NaOH chemical activation, pyrolysis, and then surface modification with polydopamine (PDA). NaOH activation and heated in 600 °C rendered to carbon materials with high specific surface area in carbon skeleton. Dopamine was self-polymerization on the biomass carbon materials to form superhydrophilic and surface-adhering PDA coating which made the composites well dispersed in soluble dyes solutions and simultaneously introduced thiol- and/or aminoterminated molecules. Different initial concentrations, pH and temperatures were discussed in detail herein. Increasing nitrogen-containing or oxygen-containing groups can enhance the adsorption efficiencies for dyes in low MB concentrations. The uptake of MB maintains 100% adsorption efficiency when pH is 12. The charge selective adsorption of CS-NaOH@PDA adsorbent was applied to adsorb other cationic dyes in aqueous solution. The as-prepared CS-NaOH@PDA composites from waste biomasses showed superior adsorption capability for cationic dyes and excellent removal rate and importantly were environmentally friendly, revealing its promising potentials in low-cost adsorbents for authentic wastewater treatment applications.

Removal of Methylene Blue Cationic Dye in Aqueous Solution by Rubia Tinctorum Seeds

Removal of Methylene Blue Cationic Dye in Aqueous Solution by Rubia Tinctorum Seeds

Elimination of a cationic dye in aqueous solution by adsorption on activated carbon: Optimization of analytical parameters, modeling and thermodynamic study

Adsorption techniques are widely used to remove certain classes of pollutants from waters, especially those that are not easily biodegradable. The aim of this study was to evaluate the adsorption of Methylene Blue (MB) dye onto activated carbon from aqueous solutions was realized in a batch system. However, some examined factors such as contact time, pH solution, initial concentration of MB, adsorbent dosage and temperature were found to have significant impacts on the adsorption capacity of AC. The AC was characterized by BET surface area measurement, Point of Zero Charge (pHpzc), FTIR spectroscopy and X-ray diffraction analysis. Batch studies were conducted in order to determine the optimal parameters required to reach the adsorption equilibrium. The maximum adsorption capacity of the AC for MB at 298 K was determined to be 170.357 mg/g. The adsorption kinetic data were analyzed employing several kinetic models: pseudo-first order, pseudo-Second order, Elovich equation, and intraparticles diffusion model. It was established that the adsorption process obeyed the pseudo-second-order kinetic model with a determination coefficient (R2) equal to 0.999. The evaluation of thermodynamics parameters such as the Gibbs free energy ΔG° (−7.856 to −6.142 kJ/mol), positive enthalpy ΔH° (13.384 kJ/mol) and the change of entropy (63.46 J/mol K) indicated a spontaneous and endothermic nature of the reaction with a chemisorption process. Comparative tests by the heterogeneous photocatalysis of MB in the presence of a semiconductor will be the subject of the rest of this study.

Adsorption of Methylene Blue Using Activated Carbon Made from Watermelon Rinds

This work reports the possibility of using sustainable waste from watermelon rinds as a potential candidate for the removal of Methylene Blue (MB) from aqueous solution in batch mode. The adsorbent was characterized by FTIR and SEM where the FTIR analysis shows peaks at 3370 cm-1 that corresponds to –OH stretching vibration for lignin, pectin and cellulose, at 1728 cm-1 corresponds to –C=O stretching of esters, carboxylic acids, and as well peak in the range of 1350 – 1000 cm-1 which indicates stretching vibration of alcohols and carboxylic acids. The availability of hydroxyl and carboxyl groups enhance high MB uptake at lower pH. The SEM image of raw adsorbent shows no development of pores, but after carbonization the pores were developed due to escape of volatile groups during carbonization and activation process. Adsorption studies using batch mode were performed by varying adsorption parameters such as adsorbent dosage, contact time, pH of the solution and initial dye concentration. The maximum capacity of the adsorbent was found to be 0.4g dosage, pH 4, 20mg/L of initial MB concentration and 60 minutes contact time that removes maximum of 197.5 mg g-1. The results indicated that watermelon rind is a successful agricultural waste that could be utilized for sustainable removal of cationic dyes in aqueous solutions.

Cyclodextrin-Cross-Linked Hydrogels for Adsorption and Photodegradation of Cationic Dyes in Aqueous Solution.

Possessing three-dimensional porous structures and tunable mechanical strengths, cyclodextrin-containing polymeric hydrogels are one of the most promising water-based adsorbent materials due to their easy availability, simple chemical modification and environmental friendliness. In this work, two kinds of hydrogels were prepared via the copolymerization with acrylic acid and vinyl-derivatized β-cyclodextrins in water. These two gels have showed good adsorption performance towards cationic dyes through the noncovalent interactions with their anionic backbones and porous network. Meanwhile, pseudo-second-order model was selected to clarify the adsorption kinetics process. Moreover, nano-scaled TiO2 was doped into these resultant cyclodextrins-based hydrogels to achieve efficient degradation of dyes upon light irradiation. The obtained TiO2 -loaded hydrogels could exhibit improved adsorption performance and make the adsorbed dyes photo-degraded with the decolorization rates above 95%. It can be envisioned that such cyclodextrin-based soft materials may find applications in dye clearance and water treatment.

Stable Indium Pyridylcarboxylate Framework with Highly Selective Adsorption of Cationic Dyes and Effective Nitenpyram Detection.

On the basis of an undeveloped asymmetrical pyridylcarboxylate ligand, 2-(2-carboxypyridin-4-yl)terephthalic acid (H3CPTA), an indium pyridylcarboxylate framework, [(Me)2NH2]1.5[In1.5(CPTA)2]·5.5NMF·6H2O (1), is synthesized under solvent thermal conditions. 1 displays a 3D anionic framework with a large void space, which contains open square channels with a cross section of 14.6 Å and a pore surface decorated with carboxylic oxygen atoms. Depending on the anionic skeleton and high water stability, 1 exhibits high adsorption selectivity and capacity for cationic dyes in aqueous solution. Furthermore, the luminescence performance illustrates that 1 has selectivity and sensitivity to nitenpyram with good recyclability.

Nitrogen-rich covalent triazine frameworks for high-efficient removal of anion dyes and the synergistic adsorption of cationic dyes

Efficient adsorption of organic dyes from effluent has great importance for ecological and environmental protection. Herein, covalent triazine frameworks (CTFs) were constructed via the polycondensation of melamine and cyanuric chloride directly. Due to the numerous basic nitrogen atoms as high as 58.98 wt%, high BET surface area (670.2 m g−1), and hierarchical pore structure, CTFs demonstrated selective adsorption of anionic dyes in high capacity (e.g., a maximum adsorption capacity of 1581 mg g−1 for Congo red at 30 °C). The mechanism of the outstanding adsorption performance was carefully verified and ascribed to the electrostatic attraction and hydrogen bonding between CTFs and anionic dyes. The amine groups linking two adjacent triazine rings have primary responsibility for the superior performance. Unexpectedly, CTFs expressed a tuning synergetic effect for removing cationic dyes in aqueous solution coexisting with anionic dyes, exhibiting a great superiority in the specific and comprehensive treatment of organic dyes contaminated water. Furthermore, CTFs were stable and had long-periodic availability for more than 6 times, ensuring the adsorption rate higher than 90%. For better operation, hybrid monolithic aerogels were constructed by incorporating CTFs into polyvinylidene fluoride then casting in melamine resin foams. The obtained aerogels expressed high-efficient removal of anionic dyes coupled with convenient operation. This well-established metal-free porous material is a promising adsorbent candidate for anionic dyes selectively and even synergetic adsorption of cationic dyes in water remediation.

Preparation of new h-MoO3 rod-like microcrystals for effective removal of cationic dye in aqueous solution

h-MoO3 rod-like microcrystals were successfully prepared using the hydrothermal microwave method and evaluated as an adsorbent for MB dye’s adsorption from an aqueous medium. The metastable phase with hexagonal structure (h-MoO3) was well confirmed by X-ray diffraction (XRD) and Raman spectroscopy. FE-SEM images of these microcrystals confirm the rod-like morphology for all microcrystals synthesized. The better adjustment of the experimental data in the adsorption kinetics study was adjusted using the pseudo-first-order model, being k1 = 0.0049 min−1, qe,cal = 99.90 mg g−1, and R2 = 0.9975. These microcrystals exhibit a high adsorption rate of MB dye in the pH interval from 4.0 to 11.0. In general, for different temperatures (298 K, 308 K, and 318 K), the experimental data were better adjusted with the Temkin isotherm model, being the process of adsorption was favorable and spontaneous. In addition, the h-MoO3-1 h rod-like microcrystals may be regenerated effectively and reused for adsorption of MB with good adsorption performance at least four times, being promising material in the adsorption of this organic pollutant in aqueous solution.

Development of biological macroalgae lignins using copper based metal-organic framework for selective adsorption of cationic dye from mixed dyes

The chemical compositions of macroalgae are protein; cholesterol, fatty acid, and lignin which mostly construct from hydroxyl and amine groups. The lignin as a key structure in the tissues of macroalgae was modified using the sulfation pathway. A novel environmental friendly adsorbent Cu-BTC@Algal was synthesized by incorporated Cu-BTC nanoparticles onto sulphated-Macroalgae biomass under solvothermal conditions and characterized by XRD, FTIR, and N2 adsorption–desorption isotherms. The removal rate of Cu-BTC@Algal was quite greater than that of Cu-BTC, showing that the adsorption performance of porous Cu-BTC can be improved through the modification of algal. Further study revealed that Cu-BTC@Algal exhibited a fast adsorption rate and selective adsorption ability towards the cationic dyes in aqueous solution. The removal rate was up to 97% for cationic dyes methylene blue (MB) and 68% for methyl orange (MO) at intervals 10 min. The influences including initial concentration, and contact time of MB/MO adsorption onto modified algal biomass, Cu-BTC and Cu-BTC@Algal were investigated in detail. The kinetic study indicated that the adsorption of MB/MO onto Cu-BTC@Algal followed the pseudo second-order model. The isotherm obtained from experimental data fitted the Langmuir model, yielding maximum adsorption capacity of 42, 73 and 162 mg g−1 for algal, Cu-BTC and Cu-BTC@Algal, respectively.

Photocatalytic degradation of cationic dye in aqueous solution by TiO2 nanoparticle immobilized on termite hill soil

This work presented the preparation and characterization of TiO2/termite hill soil (TiO2-THS) and its photocatalytic application for cationic dye (methylene blue, MB) degradation in an aqueous solution. The TiO2-THS was prepared using the impregnation method. The material properties were characterized using techniques such as gas sorption, SEM, FTIR, XRF and XRD. Optimization of photocatalytic degradation of MB under visible light irradiation was carried out using Taguchi design approach. The effects of parameters affecting the photocatalytic degradation process, pH, initial concentration, irradiation time and photocatalyst loading, were examined. It was identified that the optimum values of the concentration, pH, time and photocatalyst loading were 50 mg/L, 6.0, 90 min and 0.5 g/L, respectively. At these optimum conditions, the predicted and experimental decolorization efficiencies were 96.31% and 95.76%, respectively. MB dye was almost completely mineralized after 90 min of visible light irradiation in the presence of the TiO2-THS catalyst. The prepared photocatalyst exhibited better stability and maintained its initial activity after being reused for six successive runs with a decolorization efficiency of 86.62%.

Triazine Functionalized Porous Three-Dimensional Uranyl–Organic Framework: Extraction of Uranium(VI) and Adsorption of Cationic Dyes in Aqueous Solution

A novel uranyl-organic framework [(CH3)2NH2]2.5·(UO2)2.5(TDPAT)(TDPAT*)0.5·6.5H2O with abundant active sites and water stability was obtained by assembling high-valence U(VI) cation and triazine hexacarboxylate ligand H6TDPAT {H6TDPAT = 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine; TDPAT* = [2,4-di(3,5-dicarboxylphenylamino)-6-(3-carboxylphenylamino)[-1,3,5-triazine}. As far as we know, this is the first uranium-based metal–organic framework constructed by inorganic building bricks [UO2(RCOO)2O]–, [UO2(RCOO)3]–, and [UO2(RCOO)2OO] and triazine hexacarboxylate ligand, which exhibits an interesting structural arrangement with three-dimensional topology. In order to broaden its functional characteristics, we first investigated the functional adsorbent for extraction of uranium(VI) and adsorption of cationic dyes in aqueous solution. It exhibits excellent performance in extracting uranium from aqueous solution and is not affected by other interfering metal ions. This work shows for the first time the ...

Adsorption of cationic dye in aqueous solution by chemically modified Areca catechu husk

Adsorption of cationic dye in aqueous solution by chemically modified Areca catechu husk

Enhanced Adsorption and Photocatalytic Removal of Cationic Dyes in Aqueous Solutions by Ternary Graphene Oxide-TiO₂-SiO₂ Nanocomposites.

In this study, adsorption is an attractive for the removal of industrial dyes from aqueous simulated wastewaters is reported. The ternary graphene oxide-TiO₂-SiO₂ (GTS) nanocomposite was synthesized by sol-gel method. The as-synthesized nanocomposite was characterized by XRD, BET, FT-IR, SEM-EDAX and TEM analysis. It was found that the synthesised nanocomposite has excellent adsorption and photocatalytic degradation abilities for the removal of cationic dyes, methylene blue (MB) and crystal violet (CV) owing to its homogeneous mesoporosity with a BET surface area of 583.15 m²/g. Furthermore, the adsorption mechanism of these cationic dyes follows pseudosecond-order kinetic model. In addition, the GTS nanocomposite showed maximum adsorption efficiency over MB and CV around 384.62 mg/g and 188.68 mg/g respectively. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) calculated from the temperature dependent isotherms suggested that the adsorption was spontaneous and endothermic in nature. The study on the reusability of the GTS nanocomposite showed that, even after five succeeding cycles, the capacity of the adsorbent was almost identical.

Synthesis of nanocomposites using xylan and graphite oxide for remediation of cationic dyes in aqueous solutions

Due to the rapid development of industrialization, the water resources on which we depend are facing unprecedented challenges. Dyes, as an indispensable substance in our lives, have caused great pollution to the water resources in nature, and the removal of dyes from wastewater is becoming an important topic. A porous xylan/poly(acrylic acid)/graphite oxide nanocomposite was prepared by graft polymerization and used for adsorption of cationic ethyl violet dye in wastewaters in this paper. Various techniques, i.e., Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, elemental analysis, scanning electron microscopy, and ultraviolet-visible spectroscopy, were used to study this composite. Adsorption isotherm measurements showed that the composite's adsorption behavior fits the Langmuir isotherm adsorption model. Adsorption tests showed that this material has excellent adsorption properties; the maximum adsorption capacity for ethyl violet dye was 273.99 mg/g. Investigation of the adsorption mechanism indicated that electrostatic forces and π–π effects are mainly involved in adsorption. Desorption cycling tests showed that the adsorption efficiency of the composite was still over 95% after 3 cycles. These results show that this porous xylan/poly (acrylic acid)/graphite oxide nanocomposite has potential applications in cationic dye removal.