Uptake of anionic and cationic dyes from water using natural clay and clay/starch/MnFe2O4 magnetic nanocomposite

Esvandi, Zahra; Foroutan, Rauf; Peighambardoust, Seyed Jamaleddin; Akbari, Ali; Ramavandi, Bahman

doi:10.1016/j.surfin.2020.100754

Cited by 99 publications

(64 citation statements)

References 49 publications

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“…This resulted because the number of active sites adsorbent in the aqueous solution for the dye molecules was greater than the number of dye molecules. As a result, several active sites were unutilized 31 , 33 . Hence, the reduction in adsorption capacity was observed.…”

Section: Adsorption Studymentioning

confidence: 99%

“…8 d). This situation may be due to shrinkage and alteration of active sites on the adsorbent at a higher temperature, reducing the active adsorbent surface, and leaching the dyes into the solution due to a higher separation between the dye molecules and the adsorbent at high temperature 31 – 33 . This phenomenon demonstrated that both MB and CR’s adsorption is an exothermic process that favors low-temperature solutions.…”

Section: Adsorption Studymentioning

confidence: 99%

“…Among the techniques mentioned, the adsorption process using local biowastes is a cost-effective and efficient technique for removing toxic dyes and metal ions from wastewater 17 . Dyes are widely used in textile, food, printing, leather, and pharmacology industries 29 – 31 . The presence of dyes in aqueous solutions and the environment can affect the photosynthetic functions of plants in water by blocking the sunlight with its aromatic compounds and reducing dissolved oxygen 29 , 31 – 34 .…”

Section: Introductionmentioning

confidence: 99%

“…Dyes are widely used in textile, food, printing, leather, and pharmacology industries 29 – 31 . The presence of dyes in aqueous solutions and the environment can affect the photosynthetic functions of plants in water by blocking the sunlight with its aromatic compounds and reducing dissolved oxygen 29 , 31 – 34 . Plus, some dyes, especially cationic and anionic, are also carcinogenic and mutagenic that can affect digestive tract irritation, skin irritation, and cyanosis 28 – 32 .…”

Section: Introductionmentioning

confidence: 99%

“…Plus, some dyes, especially cationic and anionic, are also carcinogenic and mutagenic that can affect digestive tract irritation, skin irritation, and cyanosis 28 – 32 . In addition, cationic dyes like MB and anionic dyes such as CR are the most widely used dyes in industries 31 . Thus, it is crucial to control the release of these compounds to the environment.…”

Section: Introductionmentioning

confidence: 99%

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The removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon

Nizam

Hanafiah

Mahmoudi

et al. 2021

Sci Rep

239

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In this study, two biomass-based adsorbents were used as new precursors for optimizing synthesis conditions of a cost-effective powdered activated carbon (PAC). The PAC removed dyes from an aqueous solution using carbonization and activation by KOH, NaOH, and H2SO4. The optimum synthesis, activation temperature, time and impregnation ratio, removal rate, and uptake capacity were determined. The optimum PAC was analyzed and characterized using Fourier-transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), a field emission scanning electron microscope (FESEM), Zeta potential, and Raman spectroscopy. Morphological studies showed single-layered planes with highly porous surfaces, especially PAC activated by NaOH and H2SO4. The results showed that the experimental data were well-fitted with a pseudo-second-order model. Based on Langmuir isotherm, the maximum adsorption capacity for removing methylene blue (MB) was 769.23 mg g−1 and 458.43 mg g−1 for congo red (CR). Based on the isotherm models, more than one mechanism was involved in the adsorption process, monolayer for the anionic dye and multilayer for the cationic dye. Elovich and intraparticle diffusion kinetic models showed that rubber seed shells (RSS) has higher α values with a greater tendency to adsorb dyes compared to rubber seed (RS). A thermodynamic study showed that both dyes’ adsorption process was spontaneous and exothermic due to the negative values of the enthalpy (ΔH) and Gibbs free energy (ΔG). The change in removal efficiency of adsorbent for regeneration study was observed in the seventh cycles, with a 3% decline in the CR and 2% decline in MB removal performance. This study showed that the presence of functional groups and active sites on the produced adsorbent (hydroxyl, alkoxy, carboxyl, and π − π) contributed to its considerable affinity for adsorption in dye removal. Therefore, the optimum PAC can serve as efficient and cost-effective adsorbents to remove dyes from industrial wastewater.

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Section: Adsorption Studymentioning

confidence: 99%

Section: Adsorption Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon

Nizam

Hanafiah

Mahmoudi

et al. 2021

Sci Rep

239

View full text Add to dashboard Cite

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Investigation of cadmium adsorption factors from water by synthesis of chitosan/polyvinyl alcohol/modified FDU‐12 nanocomposite

Esmaeili,

Soltanolkottabi,

Hosseini

et al. 2024

J Chinese Chemical Soc

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Chitosan (CTS) and polyvinyl alcohol (PVA) are two environmentally friend polymers. In this research, methacrylate‐modified FDU‐12 (FDU‐12‐NH2) nanoparticle was synthesized. It was used in the preparation of CTS/PVA/FDU‐12‐NH2 (2%, 5% w) composites. Fourier transfer infrared spectroscopy, nitrogen adsorption/desorption, and transmission electron microscopy techniques were applied for the characteristics of the composites. Then, the produced composites were used as the adsorbents to remove cadmium (II) from the aqueous solutions. The optimal conditions of the Cd (II) adsorption factors were achieved. The different isotherms and kinetic models were applied to obtain the equilibrium adsorption information. The results indicated that Freundlich isotherm was the best isotherm model. Also, the kinetic model followed the pseudo‐second‐order. The maximum adsorption capacities were found 125 and 200 mgg−1 of the adsorbents by the Langmuir model. The results showed that the synthesized nanocomposite exhibited a good adsorbent for cadmium metal in the aqueous solution.

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Adsorption of Anionic Dyes by Polypyrrole‐Grafted Mesoporous SBA‐15 Composite: Isotherms, Kinetics, Thermodynamics, Interaction Mechanism and Recycling

Prashanna Suvaitha,

Venkatachalam

2023

ChemistrySelect

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SBA‐15/polypyrrole composite was synthesized by polymerizing pyrrole in the presence of SBA‐15. The samples were characterized using the following techniques: low‐angle XRD, wide‐angle XRD, FTIR, FESEM, TGA, HRTEM, and BET. From the low‐angle XRD analysis, it confirms the formation of a mesoporous hexagonal structure (p6 mm). From the HRTEM image, an orderly arrangement of mesopores is evident. Using adsorption techniques, our objective is to remove sunset yellow, indigo carmine, titan yellow, and orange G dye from aqueous solutions with SBA‐15/polypyrrole composite. The removal efficiency for all the dyes was greater than 90 %. The isotherm was verified to follow the Langmuir isotherm model. The maximum adsorption capacities for sunset yellow, indigo carmine, titan yellow, and Orange G were found to be 78.74 mg/g, 83.33 mg/g, 78.74 mg/g, and 106.38 mg/g, respectively. The adsorption kinetics followed a pseudo‐second‐order model, and the R2 value was greater than 0.99 for all the dyes. The thermodynamic parameters of ΔG°, ΔS°, and ΔH° showed negative values, indicating that the adsorption was spontaneous, decreased entropy, and was exothermic. The recycling of the SBA‐15/polypyrrole composite resulted in a 90 % removal efficiency for three cycles. Therefore, the present adsorbent could be applied to treat industrial effluents that contain these dyes.

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Uptake of anionic and cationic dyes from water using natural clay and clay/starch/MnFe2O4 magnetic nanocomposite

Cited by 99 publications

References 49 publications

The removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon

The removal of anionic and cationic dyes from an aqueous solution using biomass-based activated carbon

Investigation of cadmium adsorption factors from water by synthesis of chitosan/polyvinyl alcohol/modified FDU‐12 nanocomposite

Adsorption of Anionic Dyes by Polypyrrole‐Grafted Mesoporous SBA‐15 Composite: Isotherms, Kinetics, Thermodynamics, Interaction Mechanism and Recycling

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