Preparation and characterization of modified sepiolite for the removal of Acid green 20 from aqueous solutions: isotherm, kinetic and process optimization

Malakootian, Mohammad; Hossaini, Hiwa; Asadipour, Ali; Daneshkhah, Mozhgan

doi:10.1007/s13201-018-0813-8

Cited by 18 publications

(6 citation statements)

References 73 publications

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“…ese phenomena have caused public concerns and attracted relevant exploration. Numerous effective treatment techniques, including ultrasonic assisted adsorption, enzymatic treatment, various oxidants, and adsorption, have been exploited [9][10][11][12]. However, several problems emerge in the promotion and production of these methods.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Lin

et al. 2020

Journal of Chemistry

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Waste black tea powder was used as a potential adsorbent to remove methylene blue (MB) from aqueous solution. Several operating factors in adsorption of MB onto waste black tea powder were investigated, including contact time, initial MB concentration, solution pH, adsorption temperature, and dosage of waste black tea powder. Experimental results revealed that the adsorption efficiency increased with contact time and solution pH values and decreased with initial MB concentration and adsorption temperature. The equilibrium time was estimated to be around 60 min. The maximum adsorption capacity and the highest adsorption efficiency were 302.63 mg·g−1 and 100%, respectively. In kinetic study, pseudo-first-order and pseudo-second-order kinetic models, intraparticle diffusion model, and Boyd and Elovich models were employed to analyze the adsorption behavior and the adsorption mechanism. It was found that the pseudo-second-order kinetic model was suitable to describe the adsorption process, and the calculated equilibrium adsorption capacity was well close to the experimental data for different initial MB concentrations. The internal diffusion was not the only rate-controlling step, and the existence of boundary effect was observed in this study. From isotherm analysis, the equilibrium data were well represented by the Langmuir model, rather than Freundlich, Dubinin–Redushckevich, or Temkin models. The nonlinear fitting for various isotherm models implied that the adsorption behavior between MB and waste black tea powder was complication. Thermodynamic parameters including changes in Gibb’s free energy, enthalpy, and entropy suggested that adsorption of MB onto waste black tea powder was a spontaneous and exothermic process. The multiple regeneration/adsorption experiments indicated that the used black tea powder efficiently remained more than 75% after five cycles using NaOH as a regenerative reagent and thus be used for many times. Therefore, as a low-cost and easily available material, waste black tea powder could be applied in wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Lin

et al. 2020

Journal of Chemistry

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“…Modi cation of sepiolite with hexadecyltrimethylammonium, a cationic surfactant, which increased the adsorption capacity of the dye acid green to 60.6 mg/L (Malakootian et al, 2018). A novel polyacrylonitrile grafted sepiolite nanohybrid material was synthesized using synchrotron radiation grafting technology and was able to adsorb copper ions up to 278 mg/g (Taimur et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Two-step modification of sepiolite (SDS/isep) and its performance for remediation of Pb contaminated water

Feng

Wang

et al. 2023

Preprint

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To enhance the remediation capability of lead (Pb) polluted water, our approach involved a two-step modification of the initial sepiolite (sep) through inorganic mixed solutions and sodium dodecanesulfonate (referring as SDS/isep), and then the modified sepiolite (SDS/isep) is used to remove Pb2+ in Pb-contaminated water. Adsorption experiments showed that the SDS/isep had a significantly higher adsorption capacity for Pb2+ than natural sepiolite (the adsorption capacities before and after modification were 19.04 and 49.10 mg g− 1). A series of characterizations combined with adsorption kinetics and thermodynamics analysis revealed the adsorption mechanism of SDS/isep for Pb2+. The analysis results show that the monolayer adsorption of SDS/isep to Pb2+ is mainly carried out by ion exchange, surface hydroxyl complexation, chemical precipitation, and electrostatic attraction, and this adsorption reaction is a spontaneous exothermic process. The above positive results indicate the superiority of the two-step modification strategy of natural sepiolite proposed in this study.

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“…Its tunnel structure is a means for loading dyes and drugs, which has extended its potential as a delivery vehicle. Sepiolites are also known for their sorption properties for industrial wastewater purification (removing methylene blue, Acid Green, Basic Red-46, and Direct Blue-85). − Sepiolites were used as industrial reinforcing fillers for plastics, bioplastics, and natural rubbers. , This nanofiber clay binds different types of nucleic acid molecules through hydrogen bonding, cation bridges, and van der Waals forces and was considered as a DNA delivery system . Sepiolite has already been reported as biocompatible and has been successfully tested as an intramuscular and subcutaneous implantable nanomaterial …”

Section: Introductionmentioning

confidence: 99%

Lawsone and Indigo-Loaded Sepiolite Nanofibers for Hair Coloring with Sustained Release

Rahman

Karan

Lvov

et al. 2022

ACS Appl. Nano Mater.

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Natural clay materials have been present in people's lives for centuries, from pottery and house construction to food processing and cosmetics, proving their utility and safety for human use. Recent developments in tubule and fiber clay systems demonstrated their efficacy at carrying chemical loads in their inner tunnels of nanometer diameters. We exploited nanofibrous sepiolite possessing 0.4 × 1.1 nm cross-sectional tunnels for loading with dyes and drugs followed by their spontaneous assembly on human hair from an aqueous suspension to form a 1−2 μm-thick coating with a concentration near cuticle edges. This bio-friendly process avoids any chemical reactions on the hair and results in a simple and safe coating for coloring or topical medical treatment. It is especially valuable for the application of water-insoluble dyes, such as lawsone and indigo. We successfully loaded lawsone and indigo into the sepiolite and applied the composite onto hair, creating stable brown and blue coatings. Up to 80% of the initial hair color is preserved after six shampoo washes. Coatings of the dye-sepiolite composite on permed hair reduced the surface roughness, enhancing the hair volume and color performance. We also loaded sepiolite with drugs (e.g., antilice permethrin or ivermectin), which could be used for topical hair and scalp treatments with sustained release.

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Preparation and characterization of modified sepiolite for the removal of Acid green 20 from aqueous solutions: isotherm, kinetic and process optimization

Cited by 18 publications

References 73 publications

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies

Two-step modification of sepiolite (SDS/isep) and its performance for remediation of Pb contaminated water

Lawsone and Indigo-Loaded Sepiolite Nanofibers for Hair Coloring with Sustained Release

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