Methyl Violet Research Articles

Insights into mixed dye pollutant degradation by oxygen and air plasma bubbling array

Abstract Synthetic organic dye pollutants pose a serious threat to the aquatic ecological environment due to their difficulty in complete degradation. This study employed a plasma bubble array reactor to degrade individual and mixed dye pollutant solutions of Sunset Yellow (SY), Methyl Orange (MO), and Methyl Violet (MV). The degradation efficiencies and mechanisms of the plasma were investigated under different working gas atmospheres. It was found that oxygen plasma degraded the target dyes and their mixtures more significantly than air plasma. Specifically, compared with air plasma, the removal of single dyes SY, MO and MV by oxygen plasma was increased by 76.6%, 13.8% and 3%, respectively, after 20 min of treatment. As for mixed dyes, after 25 min treatment, oxygen plasma removed 99.1%, which was 31.6% higher than air plasma. However, the degradation kinetic order in oxygen plasma was SY > MO > MV, while that in air plasma was MV > MO > SY. Combined with the detection of reactive oxygen-nitrogen species (RONS), the results showed that the reactive oxygen species (ROS) played an important role in the degradation of SY, and it was also important for the degradation of MO, whereas both the ROS and reactive nitrogen species (RNS) were important for the degradation of MV. Scavenger experiments revealed that hydroxyl (·OH) and superoxide anion (·O2-) played the most important roles in the degradation process. The three dyes were basically completely degraded within 14-20 minutes of treatment, with corresponding yields of 1.94-2.79 g/kWh. Possible degradation pathways for each dye were deduced based on LC-MS and the toxicities of solutions were evaluated by phytotoxicity tests and ion chromatography. The results showed that the biotoxicity of the intermediates was significantly reduced. This study may provide a feasible option for effective application of plasma technology in organic dye wastewater treatment.

Facile Preparation of Cross-Linked Moringa oleifera Seed Hulls Powder/Hydroxyapatite Framework Composite for Efficient Removal of Toluidine Blue and Methyl Violet 2B from Aqueous Solution

AbstractIn this study, adsorption of two cationic dyes, Toluidine Blue (TB) and Methyl violet 2B (MV 2B) from an aqueous solution was achieved by using multifunctional composite material. The formulation of the composite (MO@HA) was obtained by using Moringa oleifera seed hull powder, calcium chloride (CaCl2), and ammonium hydrogenophosphate (NH4)2HPO4 salts. Surface morphology, functional groups, specific surface area, and surface charge of the composite were explored using Scanning electron microscopy (SEM), Fourier Transform infrared spectroscopy (FTIR), BET analysis, and point of zero charge (PZC), respectively. The composite material resulted in a structural change in the surface of the adsorbents, increased oxygen vacancies, enhancement of active sites, and a specific surface area of 735.55 m2 g−1. Different adsorption parameters such as pH, contact time, adsorbent dosage, and initial concentration were evaluated. The adsorption study showed that equilibrium was reached after 60 min, and the optimum adsorption pH for both dyes (TB and MV 2B) was 6. Langmuir, Freundlich, Liu, and Temkin were fitted to describe the adsorption isotherm, both TB and MV 2B had best correlation with Liu isotherm. The maximum adsorption capacity of TB and MV 2B were 341.488 and 182.453 mg g−1, respectively. Adsorption-desorption cycling studies on the adsorbent confirmed its regeneration and reusability after 5 cycles. A possible adsorption mechanism involving electrostatic interactions, n-π bonding, and hydrogen bonding was suggested. These findings highlight a new direction in the development of efficient and sustainable adsorbent in environmental remediation, specifically in the removal of dyes from aqueous solution.

Maleic Anhydride-Modified Water Hyacinth for Adsorption of Methylene Blue and Methyl Violet

Removal of toxic pollutants is of the greatest concerns facing wastewater treatment. In this study, a chemical modification method was used to prepare the maleic anhydride-modified water hyacinth (MA-EC) for the removal of methylene blue (MB) and methyl violet (MV) from water. The maleic anhydride-modified water hyacinth biosorbent was characterized and adsorption experiments were conducted. The prepared MA-EC demonstrated considerable adsorptive efficiency toward MV and MB. It was confirmed that the maximum adsorptive capacities were 1373.58 and 434.70 mg/g for MV and MB, respectively. The adsorptive data were also fitted using Langmuir and Freundlich isotherms, and the results showed that the Langmuir isotherm adsorption model could better describe the adsorptive process. Adsorption–desorption cycling experiments demonstrated that the MA-EC adsorbent had good reusability, with adsorptive capacities of 538.88 mg/g for MV and 215.56 mg/g for MB after four cycles of desorption–adsorption.

Uncovering the synthesis of a visible light-driven manganese-doped copper bismuth oxide catalyst for enhanced degradation of dye: Insights into the factors affecting the degradation

In recent times, effluent pollution has had an exceptionally detrimental effect on aquatic life as well as human beings. The management of wastewater has emerged as a formidable undertaking for scientists owing to the existence of organic contaminants. Herein, we synthesized the manganese-doped copper bismuth oxide (Mn0.15Cu0.85Bi2O4) through hydrothermal method and employed them for successfully eliminating complex pollutants. The assessment of the visible light-induced photocatalytic efficacy of the catalyst was performed for the degradation of methyl violet (MV). MV had a degradation of 89.68% when CuBi2O4 was used. However, the degrading rate of the Mn0.15Cu0.85Bi2O4 escalated to 99.18% in 36 min. The rate constant exhibited a rise between 0.0627 and 0.1134 min−1, confirming the effectiveness of the Mn0.15Cu0.85Bi2O4. The effectiveness of the Mn0.15Cu0.85Bi2O4 is due to its superior surface area (51.97 m2/g), which arises from the integration of Mn-ions. Additionally, examining the impact of different reaction variables revealed a substantial correlation with the elimination of MV dye. The potential reason for the deterioration of MV could be attributed to the generation of •OH and O2•− radicals, which was confirmed by radical trapping experiments. The photostability of the generated Mn0.15Cu0.85Bi2O4 catalyst exhibited remarkable characteristics. Ultimately, this study presents a technique for creating effective catalysts for treating wastewater that is both economical and practical.

Application of natural biomass of prickly pear peel in methyl violet 2b removal: Adsorptive multivariable optimization and mechanistic approach

Application of natural biomass of prickly pear peel in methyl violet 2b removal: Adsorptive multivariable optimization and mechanistic approach

Nano-synthesis, characterization, theoretical, biological and catalytic studies of Mn(II), Cu(II), Cd(II), and Th(IV) complexes based on antipyrine azo dye ligand

The design and detailed characterization of the azo dye ligand obtained from the reaction of 4-aminoantipyrine diazonium salt with 3-hydroxybenzaldehyde (HL) and its novel metal chelates with Mn2+, Cu2+, Cd2+ and Th4+ ions have been presented. Utilizing modern spectroscopic and analytical techniques, these complexes were found to adopt an octahedral geometry, demonstrate inner sphere d2sp3 hybridization for Th(IV) complex and outer sphere sp3d2 hybridization for other complexes. Particle sizes calculated using the Debye-Scherrer equation on XRD patterns were 32.05 nm for Mn(II), 34.07 nm for Cu(II), 30.90 nm for Cd(II), and 22.05 nm for Th(IV). These substances' anticancer activity was assessed on human lung cancer cells (A-549) and pancreatic carcinoma cell lines (PANC-1). Cd(II) complex exhibited higher cytotoxicity against the A-549 cell line than the reference drug vinblastine sulfate which revealing its potential application as a new anticancer agent. Quantum chemical computations using the DMOL3 module's density functional theory (DFT) and molecular docking studies with the Schrödinger suite demonstrated significant inhibitory effects of the free organic compound and Cu(II) chelate on the FGFR1 protein, crucial for cell development and differentiation. Additionally, the study examined the catalytic activity of HL and its metal chelates in the oxidative degradation of methyl violet 2B dye in presence of H2O2. The order was followed by the pseudo-first-order rate constants: Th(IV) chelate (0.9556 min⁻¹) > HL (0.4911 min⁻¹) > Cu(II) chelate (0.5979 min⁻¹) > Mn(II) chelate (0.2645 min⁻¹) > Cd(II) chelate (0.2280 min⁻¹).

Transforming waste to purity: 3D electro-Fenton process boosted with pistachio shell-derived iron-biochar electrode for methyl violet 2B dye catalytic removal

Traditional degradation methods with typical catalysts which have limited negatively charged surfaces are not effectively degrade cationic dyes. A multi-functional iron-biochar was prepared from waste pistachio shells (Fe@PSB) that offers enhanced dye removal due to abundance of negatively charged sites for the degradation of the carcinogenic dye known as methyl violet 2B (MV 2B) in a cutting-edge three-dimensional electrochemical Fenton system (3DEF) with graphite (GP) cathode and Titanium (Ti) anode (3DEF-Ti/GP). Catalytic properties of Fe@PSB were explored for MV 2B dye degradation at broad acidic pH range. At optimum operating conditions of the current of 2.0A, pH 5.0, and Na2SO4 dose of 0.2M, nearly 98.8% of 10mg/L MV 2B dye removal was attained in 60min of electrolysis time. Commercial particle electrodes did not perform as well for the MV 2B dye degradation. The catalytic mechanism of 3DEF-Ti/GP system was investigated by quenching experiments which revealed that the hydroxyl radical (•OH) was responsible for the oxidation of dye molecules. Fe@PSB significantly performed up to four successful cycles. Liquid chromatography-mass spectrometry analysis revealed that de-methylation was the primary degradation pathway. This unique approach not only valorizes agricultural waste but also paving the way for greener environmental solutions.

Enhanced Catalytic Activity for Production of Biodiesel from Aloe vera Oil and the Removal of Methyl Violet Dye using Polyaniline-Fe3O4 Magnetic Nanocomposite

The aim of this work was to use a unique technique to maximize the efficiency and cost-effectiveness of biodiesel synthesis utilizing Aloe vera oil. Moreover, in order to facilitate the magnetic separation from the resultant mixture, lipase was immobilized on a magnetic nanocomposite consisting of polyaniline (PANI) and Fe3O4. Utilizing XRD, SEM, TGA and FTIR spectroscopy, the nanocomposite was thoroughly characterized. The results indicated that the immobilized lipase exhibited enhanced thermal stability and a modified optimum pH compared to its free form. Using immobilized lipase also significantly improved the biodiesel conversion yield from 27% with free enzyme to 60%. Remarkably, after five cycles of reutilization in the production of biodiesel, the immobilized lipase retained 90% activity. The catalytic effectiveness of lipase during biodiesel synthesis was significantly enhanced and its resistance to heat and pH fluctuations was strengthened by this novel immobilization approach. Beyond its potential usage in biodiesel production, the PANI-Fe3O4 magnetic nanocomposite also demonstrated photocatalytic removal and degradation of methyl violet dye from aqueous solution.

Preparation and characterization of palm tree flower biomass-based biochar and its application for the effective removal of methyl violet dye

Preparation and characterization of palm tree flower biomass-based biochar and its application for the effective removal of methyl violet dye

Unveiling the synthesis of highly efficient cerium-doped zinc nanoferrites anchored over graphitic carbon nitride for enhanced photocatalytic water purification implications

Over the past several years, the manufacturing and dispersal of naturally occurring dyes from various paint and textile companies have placed aquatic environments at an elevated risk of devastation. To address this pollution of the environment, it is imperative to focus on removing these dyes in order to address environmental pollution. Herein, we used hydrothermal technique to synthesize cerium-doped zinc nanoferrites anchored over graphitic carbon nitride (Ce0.15Zn0.85Fe2O4/g-CN), a photocatalyst that is both extremely adaptable and exceedingly efficient. The association between the catalytic efficiency and the material properties of the manufactured catalysts was examined with a diverse array of methods of characterization. The photodegradation efficacy of the Ce0.15Zn0.85Fe2O4/g-CN photocatalyst was examined using the methyl violet (MV) dye. The Ce0.15Zn0.85Fe2O4/g-CN photocatalyst exhibited an exceptional photodegradation of 97.19 % under solar light in comparison to pure ZnFe2O4 (73.81 %) and Ce0.15Zn0.85Fe2O4 (84.52 %), respectively, under constant conditions of reaction. The Ce0.15Zn0.85Fe2O4/g-CN photocatalyst’s improvement in photodegradation of the MV dye was attributed to a rise in active sites and an elevation in surface area to 128.67 m2/g as a result of g-CN incorporation in the material and was much greater than ZnFe2O4 (76.87 m2/g) and Ce0.15Zn0.85Fe2O4 (92.08 m2/g). The reaction circumstances were also adjusted to ascertain the impact of multiple variables. Radical trapping agents’ studies were employed to validate reactive oxygen species. The Ce0.15Zn0.85Fe2O4/g-CN photostability and recycling were assessed by executing four consecutive investigations under predetermined conditions for the reaction. Eventually, this research will yield an environmentally benign and economically viable photocatalyst for efficiently degrading MV dye in water reservoirs.

Modified magnetic Nano-Biocomposite as friendly environmental catalyst for rapid degradation of organic dyes and selective aerobic oxidation of cyclohexene through advance oxidation process

To eliminate contaminated organic matter from water and wastewater, a stable, recyclable, and environmentally friendly nano-biocomposite was designed. The magnetic Fe3O4 nanoparticles were functionalized by SiO2/N-2-(aminoethyl)-3-aminopropyl/glutaraldehyde/chitosan/Cobalt to fabricate nano-biocomposite (FS-(Am/g/Cs)@CoNPs). The morphological/structural identification of nano-biocomposite was carried out by ICP-OES, DR-UV, XRD, FE-SEM, TEM, HR-TEM, BET, EDX, FT-IR, TGA, and VSM techniques. The catalytic performance of this heterogeneous catalyst was studied in the degradation of organic dyes including methylene blue, methyl orange, methylene violet, and Bisphenol A, and efficiency was achieved at 99.3 % (kobs = 0.3703 min−1), 97.4 % (kobs = 0.3627 min−1), 93.6 % (kobs = 0.228 min−1) and 98.8 % (kobs = 0.459 min−1) after 12–14 min at room temperature in pH = 7.0, respectively. The reaction proceeded through the activation of Co2+/Co3+ which occurs on the surface of the FS-(Am/g/Cs)@CoNP by the PMS/O2 system through recombination of SO4•- and OH•. Furthermore, selective allylic oxidations of cyclohexene to cyclohexenone (TOF = 4583.7 h−1, 100 % selectivity, 98 % conversion) were done by this nano-biocomposite.

Quaternary Biocomposite of Chitosan-Polyvinyl Alcohol/Food Grade Algae/ Montmorillonite Clay for Cationic Methyl Violet 2B Dye Removal: Optimization and Desirability Functions

Quaternary Biocomposite of Chitosan-Polyvinyl Alcohol/Food Grade Algae/ Montmorillonite Clay for Cationic Methyl Violet 2B Dye Removal: Optimization and Desirability Functions

Highly energy-efficient degradation of simulated dye wastewater by array type underwater bubble discharge plasma: Key factors identification and degradation pathways

The extensive use of dyes presents a significant safety concern for the reuse of water resources, highlighting the critical need for a rapid and efficient degradation method for dye mixtures in wastewater. This study introduces a degradation system based on an array type underwater bubble discharge plasma specifically designed to treat a dye mixture wastewater containing methylene blue (MB) and methyl violet 2B (MV2B). Analysis of the optical and electrical characteristics reveals that the device experiences minimal temperature increase, with the highest intensity of the band associated with N2 in the emission spectra, and discharges occurring predominantly during the rising and falling edges of a pulse cycle. Experimental results demonstrate that the most effective degradation efficiencies (MB = 94.83%, MV2B = 93.48%) are achieved at an initial dye concentration of 50 mg/L, a power supply frequency of 6 kHz, an air flow rate of 2.5 SLM and an initial electrical conductivity of 50 μS/cm. The degradation of dyes is primarily attributed to the demethylation process of O3(aq) and other species. Toxicity analysis indicates that the plasma degradation process significantly reduces the toxicity of the intermediate products of dyes. This study not only presents a novel approach for treating high concentration mixed dye wastewater, but also provides valuable insights for future research in this area.

Visible/solar light active transparent BiB3O6 glass- ceramics multi-catalysis

Borate based non-centrosymmertic crystals are known for their non-linear optical properties. This study reports BiB3O6 glass-ceramics for photocatalysis and piezocatalysis applications. These were fabricated via. melt-quench technique and yellow transparent glass samples were made. Effectiveness of a bismuth-triborate glass-ceramic (BiB3O6) in degrading methylene blue (MB) and methyl violet (MV) dye undergoing photocatalysis in the presence of visible light and solar light for MB dye was studied. Degradation observed in photocatalysis was ∼62 % and ∼50 % for MB and MV dye respectively in 240 min whereas, ∼72 % of MB dye was degraded under solar light. Piezocatalysis was examined to assess the extended potential of this material, resulting in approximately ∼76 % degradation of MB dye. Moreover, in synergistic photo-piezocatalysis degradation of ∼88 % was observed. Phytotoxicity was also assessed using the germination index (GI) showing ∼76 %, using heat treated sample.

Green and Reflux method synthesis of CeO2/rGO for their characterization and Photodegradation of dye

In this study, cerium oxide (CeO2) was synthesized using a green and eco-friendly solution combustion method with lemongrass as the fuel source. The synthesis process was simple and environmentally friendly, leveraging a straightforward reflux technique to prepare the CeO2/rGO composite. The resulting CeO2 and CeO2/rGO composite was characterized using various analytical techniques, including XRD, FE-SEM, FTIR, EDX, UV-Vis, XPS, and BET analysis. The photocatalytic performance of the CeO2/rGO composite was evaluated through the degradation of Methyl Violet (MV) dye, demonstrating a remarkable photocatalytic efficiency with approximately 99 % degradation following a first-order reaction kinetics. The half-life period (t₁/₂) of the degradation process was determined to be 19.01 minutes, and the rate constant (k) was calculated to be 0.03971 min⁻¹. The study also explored various factors affecting the photocatalytic activity, including pH levels, dye concentration, light source, and the amount of catalyst used. Additionally, scavenger studies were performed to identify the reactive species involved, and the total organic carbon (TOC) removal efficiency was evaluated. The reusability of the CeO2/rGO catalyst was also investigated, demonstrating its potential for sustainable and effective application in environmental remediation processes.

High removal of methylene blue and methyl violet dyes from aqueous solutions using efficient biomaterial byproduct

Dyes are among the toxic contaminants that significantly impact water ecosystems. A biomaterial prepared from Zizyphus Spina-Christi seed (ZSCS) to remove methylene blue (MB) and methyl violet (MV) from an aqueous solution was investigated. Several techniques have been used, including FTIR, SEM, EDX, XPS, and TGA, to characterize the physical and chemical properties of ZSCS. The effect of various parameters such as pH, adsorbent dosage, contact time, temperature, and initial dye concentration on the adsorption process were studied. The ZSCS adsorbent showed efficient MB and MV dye adsorption with Langmuir adsorption capacity of 666.66 and 476.19 mg/g, respectively, at experimental condition [(pH = 6; time = 30 min; T = 45 °C, dye concentration: 500 mg/L, and adsorbent dose = 0.6 g/L for MB and 1 g/L for MV dye)]. Kinetic and isotherm models were applied to fit the experimental outcomes. The result showed that ZSCS showed an ultrafast absorption process with a high removal efficiency of MB and MV within 5 min indicating its effective adsorption properties. The Langmuir isotherm model was the most suitable model for describing the adsorption of MB and MV dyes on ZSCS. The pseudo-second-order model kinetic fits better to MB and MV adsorption onto ZSCS than other models, suggesting that the adsorption mechanism followed chemisorption. Our results could offer an efficient cost-effective approach for dye removal from wastewater.

Temperature-Regulated Synthesis of Hyaluronic Acid-Interpenetrated Polyacrylamide/Poly(Acrylic Acid Sodium Salt) Semi-Interpenetrated Polymer Network Gel for the Removal of Methyl Violet.

An alternative synthetic pathway was proposed for the optimization of synthesis to find a better correlation between the swelling and elasticity of hyaluronic acid-interpenetrated gels via temperature regulation. An experimental design methodology was presented for the synthesis of polyacrylamide/poly(acrylic acid sodium salt)/hyaluronic acid, PAAm/PSA/HyA, gels by modifying the one-pot procedure using free radical crosslinking copolymerization of AAm with the addition of anionic linear PSA chains in the presence of various amount of HyA, ranging between 0.05% and 0.20% (w/v). Semi-interpenetrated polymer network (IPN)-structured gels were designed with tunable elasticity, in which the extent of covalent crosslinking interactions is controlled by polymerization temperature ranging between -18 and 45 °C. Depending on the HyA content added in the synthesis and the polymerization temperature, the swelling ratio could be controlled. The addition of 0.05% (w/v) HyA increased the swelling of semi-IPNs, while the elastic modulus increased with increasing HyA content and decreased with the polymerization temperature. PAAm/PSA/HyA semi-IPNs showed the typical pH-sensitive swelling of anionic gels, and the swelling reached a maximum at a pH of 11.2. PAAm/PSA/HyA gels were tested for the removal of methyl violet from wastewater. Adsorption kinetics were shown to be well-fitted with the pseudo-second-order model using linear and nonlinear regression analysis. With the clear relationship between increased modulus and composition, this study enabled the fine-tuning of semi-IPN interactions by varying the polymerization temperature.

Copper supported Dowex50WX8 resin utilized for the elimination of ammonia and its sustainable application for the degradation of dyes in wastewater

To obtain high efficient elimination of ammonia (NH4+) from wastewater, Cu(II), Ni(II), and Co(II)) were loaded on Dowex-50WX8 resin (D-H) and studied their removal efficiency towards NH4+ from aqueous solutions. The adsorption capacity of Cu(II)-loaded on D-H (D-Cu2+) towards NH4+ (qe = 95.58 mg/g) was the highest one compared with that of D-Ni2+ (qe = 57.29 mg/g) and D-Co2+ (qe = 43.43 mg/g). Detailed studies focused on the removal of NH4+ utilizing D-Cu2+ were accomplished under various experimental conditions. The pseudo-second-order kinetic model fitted well the adsorption data of NH4+ on D-Cu2+. The non-linear Langmuir model was the best model for the adsorption process, producing a maximum equilibrium adsorption capacity (qmax = 280.9 mg/g) at pH = 8.4, and 303 K in less than 20 min. The adsorption of NH4+ onto D-Cu2+ was an exothermic and spontaneous process. In a sustainable step, the resulting D-Cu(II)-ammine composite from the NH4+ adsorption process displayed excellent catalytic activity for the degradation of aniline blue (AB) and methyl violet 2B (MV 2B) dyes utilizing H2O2 as an eco-friendly oxidant.

Fabrication of ZnCo2O4-Zn(OH)2 Microspheres on Carbon Cloth for Photocatalytic Decomposition of Tetracycline.

Zinc cobalt oxide-zinc hydroxide (ZnCo2O4-Zn(OH)2) microspheres were successfully fabricated on carbon cloth via a sample hydrothermal method. The surface morphology of these microspheres and their efficacy in degrading methyl violet were further modulated by varying the thermal annealing temperatures. Adjusting the thermal annealing temperatures was crucial for controlling the porosity of the ZnCo₂O₄-Zn(OH)₂ microspheres, enhancing their photocatalytic performance. Various analytical techniques were utilized to evaluate the physical and chemical properties of the ZnCo2O4-Zn(OH)2 microspheres, including field-emission scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, field-emission transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis spectroscopy. Compared to untreated ZnCo2O4-Zn(OH)2 microspheres, those subjected to thermal annealing exhibited increased specific surface area and light absorption capacity, rendering them highly effective photocatalysts under UVC light exposure. Subsequent studies have confirmed the superior performance of ZnCo2O4-Zn(OH)2 microspheres as a reusable photocatalyst for degrading methyl violet and tetracycline. Furthermore, trapping experiments during the photodegradation process using ZnCo₂O₄-Zn(OH)₂ microspheres identified hydroxyl radicals (·OH) and superoxide radicals (·O₂⁻) as the primary reactive species.

High adsorption capacities for dyes by a pH-responsive sodium alginate/sodium lignosulfonate/carboxylated chitosan/polyethyleneimine adsorbent

Dyes are indispensable for the rapid development of society, but untreated dye wastewater can threaten human health. In this study, an adsorbent (SA/SL/CCS/PEI@MNPs) was synthesized by one-pot method using magnetic nanoparticles (MNPs), sodium alginate (SA), sodium lignosulfonate (SL), carboxylated chitosan (CCS) and polyethyleneimine (PEI). The adsorbent was mesoporous micrometer-sized particles with pore size of 34.92 nm, which was favorable for dynamic column experiments. SA/SL/CCS/PEI@MNPs possessed pH-responsive performance. Under acidic condition, the maximum adsorption capacities for anionic dyes (tartrazine, reactive black-5, indigo carmine) reached >550 mg/g. Under alkaline condition, those for cationic dyes (methylene blue, methyl violet, neutral red) exceeded 1900 mg/g. The function of the various modifiers was investigated. The results indicated that the incorporation of SL, CCS and PEI was able to provide plenty of sulfonate, carboxylate and amino/imine reactive groups so that adsorption capacities of dyes were improved. The adsorption mechanism was explored by FTIR and XPS. At the same time, the adsorption mechanism was more deeply analyzed using molecular dynamics simulations and radial distribution function. It was demonstrated that the dyes adsorption on the SA/SL/CCS/PEI@MNPs was mainly due to electrostatic attraction and π-π interaction. In addition, the adsorbent had good reusability, and the removal still reached over 90 % after five cycles. In conclusion, the adsorbent displayed a broad prospect for the adsorption of organic dyes.