Removal of Methylene Blue from Aqueous Solution by Powdered Expanded Graphite: Adsorption Isotherms and Thermodynamics

Tan, Shui Cheng; Shi, Peng; Su, Rui; Zhu, Min

doi:10.4028/www.scientific.net/amr.424-425.1313

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…In the present study, pristine graphite powder was tested for its feasibility to adsorb methylene blue. Instead of using pristine graphite, most research works tend to further process the graphite into expanded graphite or graphene oxide nanoparticles for dye adsorption [25][26][27][28][29][30][31][32][33][34]. However, this additional process consumes more chemicals and energy, and thus increases the material cost.…”

Section: Introductionmentioning

confidence: 99%

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Mah,

Azhar,

Wong

et al. 2023

Chem Eng & Technol

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Graphite is often converted to expanded graphite or graphene for water remediation. However, these processes require extra chemicals and energy. This study tested loose and encased pristine graphite powders for dye removal. The loose graphite exhibited good methylene blue removal (>97 % across pH levels), indicating that π‐π interaction is the governing factor besides electrostatic attraction. Notably, 5 g of loose graphite led to 100 % removal. Langmuir isotherm fitting disclosed a maximum adsorption capacity of 4.7059 mg g−1. Principal component analysis showed that dye concentration and adsorbent dosage had a greater impact than pH and contact time. However, encasing graphite in a tea bag inhibits adsorption; future studies could explore options facilitating adsorbate penetration into tea bags.

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Section: Introductionmentioning

confidence: 99%

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Mah,

Azhar,

Wong

et al. 2023

Chem Eng & Technol

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“…Expanded graphite (EG) has gained much attention due to its excellent properties, such as low density, multi-porosity, large-specific surface area, and hydrophobic properties [7]. Recently, EG has been considered essential for adsorption with a high sorption efficiency, especially organic compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Expanded Graphite : Effect of the graphite flake size on adsorption capacities to Methylene Blue

Thi¹,

Huong²,

Thi³

et al. 2021

Vietnam j. catal. adsorp.

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For the first time, the expansion grade of graphite was studied through the effect of the flake size. The result shown the larger flake size exhibits a higher expansion grade. In addition, the more expanded material, the higher specific surface area can be obtained. The synthesized expanded graphites were used for the adsorption of methylene blue. The expanded graphite with the highest expansion grade displayed the highest adsorption capacity due to its specific surface area.

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“…Therefore, it is necessary to prepare a PU sponge with low cost, simple preparation process, and magnetic properties, which can be applied to oil-water separation. Expanded graphite (EG) is a porous worm-shaped material formed by the expansion of natural graphite flakes at high temperatures, and it is extremely inexpensive and has a strong adsorption capacity [28][29][30][31][32]. Stearic acid is a water-insoluble fatty acid, which has good hydrophobic properties and is inexpensive [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Hydrophobic Composite Polyurethane Sponge for Oil–Water Separation

Peng

Xi-quan

et al. 2020

Applied Sciences

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Crude oil spills from offshore oil fields will cause serious pollution to the marine ecological environment. Many 3D porous materials have been used for oil–water separation, but they cannot be widely used due to complex preparation processes and expensive preparation costs. Here, a facile and cheap approach to disperse expanded graphite (EG), stearic acid, and Fe3O4 magnetic nanoparticles on the skeleton surface of polyurethane (PU) sponge to prepare the magnetic and hydrophobic composite polyurethane sponge for oil–water separation. The results show that the composite PU sponge had a strong oil absorption capacity for various oils, the oil adsorption capacities has reached 32–40 g/g, and it has become more hydrophobic. The addition of Fe3O4 magnetic nanoparticles endowed the sponge with magnetic responsivity, and the composite PU sponge still had a strong oil adsorption capacity after several adsorbing-squeezing cycles. The magnetic and hydrophobic composite polyurethane sponge is a very promising material for practical oil adsorption and oil–water separation.

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Removal of Methylene Blue from Aqueous Solution by Powdered Expanded Graphite: Adsorption Isotherms and Thermodynamics

Cited by 6 publications

References 7 publications

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Loose and Encased Graphite for Methylene Blue Adsorption: Process Optimization and Principal Component Analysis

Synthesis of Expanded Graphite : Effect of the graphite flake size on adsorption capacities to Methylene Blue

Magnetic and Hydrophobic Composite Polyurethane Sponge for Oil–Water Separation

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