Adsorption of Methyl Chloride on Molecular Sieves, Silica Gels, and Activated Carbon

Lad, Jai; Makkawi, Yassir

doi:10.1002/ceat.201900199

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…PFO gave an insight that the rate-limiting step involved in the adsorption of RBBR onto LSDAC was contributed by physisorption. A similar case was observed in methyl chloride adsorption by AC . Rate constants from both PFO and PSO were found to decrease from 0.0215 to 0.0122 min –1 and from 0.00094 to 0.00004 g mg –1 min –1 , respectively, as the initial concentration of RBBR increased from 25 to 300 mg/L.…”

Section: Resultsmentioning

confidence: 99%

“…A similar case was observed in methyl chloride adsorption by AC. 48 Rate constants from both PFO and PSO were found to decrease from 0.0215 to 0.0122 min −1 and from 0.00094 to 0.00004 g mg −1 min −1 , respectively, as the initial concentration of RBBR increased from 25 to 300 mg/L. At higher concentrations, competition among RBBR molecules for active sites makes the adsorption process slower, thus producing a smaller rate constant.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Mesoporous Activated Carbon from Leaf Sheath Date Palm Fibers by Microwave-Assisted Phosphoric Acid Activation for Efficient Dye Adsorption

et al. 2022

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Remazol Brilliant Blue R (RBBR) is a common dye used in the industry, and its presence in wastewater and discharge into the environment can create a serious concern for the ecosystem and human health. Activated carbon produced from crop residues has emerged as a promising technique for removing contaminants from wastewater. In this study, leaf sheath date palm fiber-based activated carbon (LSDAC) was synthesized via phosphoric acid, H 3 PO 4 , treatment, followed by a microwaveinduced carbonization process. The produced LSDAC was found to have a BET surface area of 604.61 m 2 /g, a Langmuir surface area of 922.05 m 2 /g, a total pore volume of 0.35 cm 3 /g, and an average pore size of 2.75 nm. The highest removal of RBBR was achieved at a solution pH of 3 (92.56 mg/g) and a solution temperature of 50 °C (90.37 mg/g). Adsorption of RBBR onto LSDAC followed the Langmuir isotherm model with a maximum monolayer capacity, Q m , of 243.43 mg/g, whereas in terms of kinetics, this adsorption system was best described by the pseudo-first-order (PFO) model. The calculated thermodynamic parameters ΔH°, ΔS°, ΔG°, and Arrhenius activation energy, E a , were 4.71 kJ/mol, 0.10 kJ/mol•K, −26.25 kJ/mol, and 5.88 kJ/mol, respectively, indicating that the adsorption of RBBR onto LSDAC was endothermic in nature, exhibited increased randomness at the solid−liquid interface, and was spontaneous and controlled by physisorption.

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Section: Resultsmentioning

confidence: 99%

Section: Adsorption Kineticsmentioning

confidence: 99%

Mesoporous Activated Carbon from Leaf Sheath Date Palm Fibers by Microwave-Assisted Phosphoric Acid Activation for Efficient Dye Adsorption

et al. 2022

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“…Molecular sieves are considered more efficient than other desiccants such as activated charcoal, silica gel, and alumina for dehydration in that they are small-pore adsorbents and with less possibility of co-adsorption of hydrocarbons [36]. Lad and Makkawi [37], after comparing the adsorption efficiency of methyl chloride among activated carbon, silica, and molecular sieves, found that the adsorption capability increased with the increase in adsorbent surface area. The molecular sieves vibrated by rotary shaking were The water-removal efficiency, as defined in Equation ( 1), was found to decrease with the operating time due to the broken structure and thus partial water-adsorption function loss of the molecular sieves after 3 h of absorbing water from ethanol accompanied by electromagnetic stirring in Figure 4.…”

Section: Effect Of Vibration Modes On Water-removal Efficiencymentioning

confidence: 99%

Comparison of Water-Removal Efficiency of Molecular Sieves Vibrating by Rotary Shaking and Electromagnetic Stirring from Feedstock Oil for Biofuel Production

Lin

2021

Fermentation

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Adequate water-removal techniques are requisite to remain superior biofuel quality. The effects of vibrating types and operating time on the water-removal efficiency of molecular sieves were experimentally studied. Molecular sieves of 3 Å pore size own excellent hydrophilic characteristics and hardly absorb molecules other than water. Molecular sieves of 3 Å accompanied by two different vibrating types, rotary shaking and electromagnetic stirring, were used to remove initial water from the reactant mixture of feedstock oil in order to prevent excessive growth or breeding of microorganisms in the biofuel product. The physical structure of about 66% molecular sieves was significantly damaged due to shattered collision between the magnetic bar and molecular sieves during electromagnetic stirring for 1 h. The molecular sieves vibrated by the rotary shaker appeared to have relatively higher water-removal efficiency than those by the electromagnetic stirrer and by keeping the reactant mixture motionless by 6 and 5 wt.%, respectively. The structure of the molecular sieves vibrated by an electromagnetic stirrer and thereafter being dehydrated appeared much more irregular and damaged, and the weight loss accounted for as high as 19 wt.%. In contrast, the structure of the molecular sieves vibrated by a rotary shaker almost remained original ball-shaped, and the weight loss was much less after regenerative treatment for those molecular sieves. As a consequence, the water-removal process using molecular sieves vibrated by the rotary shaker is considered a competitive method during the biofuel production reaction to achieve a superior quality of biofuels.

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“…A number of studies have been reported by various authors for dye adsorption by using several adsorbents. Animal or plant-based activated charcoal such as rice husk, 16 coir pith, 17 bamboo, 18 sawdust, 19 agricultural wastes, 20 wood, 21 collagen, 22 bone, 23 and petroleum pitch, 24 inorganic adsorbents namely lignite, 25 zeolite, 26 and silica molecular sieves, 27 biopolymers, 28 and nano metal oxides [29][30][31][32][33] are the widely studied adsorbent materials. Carbon nanotubes (CNTs) possess unique structures and physical properties which makes them a promising candidate for the adsorption of dyes from industrial effluents.…”

Section: Introductionmentioning

confidence: 99%

Magnetized CNTs incorporated MBA cross‐linked guar gum nano‐composite for methylene blue dye removal

Sayana,

Prajwal,

Deeksha

et al. 2023

J of Applied Polymer Sci

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In the present work, a magnetized multiwalled carbon nanotube dispersed in chemically cross‐linked gaur gum was developed as a nano‐composite adsorbent material for the removal of dye from wastewater. The gaur gum, a bio‐macromolecule was chemically modified by cross‐linking with methylene bis‐acrylamide in the presence of sodium hydroxide as a novel approach to prepare the gel matrix. The magnetite nanoparticles loaded multiwalled carbon nanotubes were dispersed in methylene bis‐acrylamide cross‐linked gaur gum gel during gelation. The nano‐composite was characterized for morphological, spectral, and analytical data. The solid form of the nano‐composite was evaluated as an adsorbent material for the treatment of water containing methylene blue dye molecules as pollutants by the spectrophotometric method. Adsorption isotherm studies suggested that the Freundlich model was the befitting model for adsorption, indicating the multilayered adsorption and the kinetic study revealed the adsorption to occur by a pseudo‐second‐order kinetic process. The novel nano‐composite is found to be a promising material for the adsorptive removal of dye molecules from dye‐contaminated wastewater. The adsorption capacity was observed to be 11 mg/g of the material.

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Adsorption of Methyl Chloride on Molecular Sieves, Silica Gels, and Activated Carbon

Cited by 10 publications

References 36 publications

Mesoporous Activated Carbon from Leaf Sheath Date Palm Fibers by Microwave-Assisted Phosphoric Acid Activation for Efficient Dye Adsorption

Mesoporous Activated Carbon from Leaf Sheath Date Palm Fibers by Microwave-Assisted Phosphoric Acid Activation for Efficient Dye Adsorption

Comparison of Water-Removal Efficiency of Molecular Sieves Vibrating by Rotary Shaking and Electromagnetic Stirring from Feedstock Oil for Biofuel Production

Magnetized CNTs incorporated MBA cross‐linked guar gum nano‐composite for methylene blue dye removal

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