Surface areas of cottons and modified cottons before and after swelling as determined by nitrogen sorption

Forziati, Florence H.; Brownell, R. M.; Hunt, C. M.

doi:10.6028/jres.050.022

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…The obtained specific surface area of CLP by BET essay was 6.09 m 2 /g (at ambient pressure: 1 atm and detector temperature: 100 °C), which is relatively larger than that of flax, cotton and cellulose fibers. Our value is near to the values reported in [27,28] and the total pore volume of CLP was 0.0692 m 3 /g.…”

Section: Characterization Of Chicory Leaf Powdersupporting

confidence: 81%

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

et al. 2020

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In this study, the Chicory leaf powder (CLP) was used as a native adsorbent to eliminate the Acid Blue 25 dye from aqueous media. The prepared native adsorbent was characterized by several techniques including the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform spectroscopy (FTIR), Brunauer-Emmet-Teller essay (BET), and particle size analyzer (PSA). A collection of experiments was performed to distinguish the optimal conditions and to probe the effects of the different parameters such as initial concentration, contact time, adsorbent dosage, pH of solution, and temperature on the sorbent capacity. The attained optimal conditions for removal the Acid Blue 25 dye were pH = 3-4, contact time 50 min, dosage 0.1 g, and initial concentrations 10 (mg/L) at 30 °C. The adsorption data revealed that the adsorption procedure has more match with the Langmuir isotherm than others. The kinetic data were better fitted with the pseudo-second-order pattern with a trusty correlation coefficient. Finally, the thermodynamic parameters illustrated that the adsorption process is exothermal and spontaneous. Based on magnitude of the standard enthalpy change related to the studied adsorption, we may derive that the considered adsorption is physical adsorption.

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Section: Characterization Of Chicory Leaf Powdersupporting

confidence: 81%

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

et al. 2020

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“…A THC mass of 10 μg was deposited to each cotton cloth substrate. Assuming uniform coverage for each 0.9 g strip, this would represent a submonolayer coverage of THC (4 × 10 12 molecules cm –2 ) if a typical cotton specific surface area (0.5 m 2 g –1 ) is assumed . However, the film is likely heterogeneous with spatially variable thickness.…”

Section: Resultsmentioning

confidence: 99%

Heterogeneous Ozonolysis of Tetrahydrocannabinol: Implications for Thirdhand Cannabis Smoke

Wylie

Abbatt

2020

Environ. Sci. Technol.

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Thirdhand smoke (THS) deposits to surfaces following smoking events and is a source of chemical exposure to humans. However, the evolution of THS in indoor environments is not well understood. Cannabis THS is a chemically distinct and prevalent form of THS, which has not been studied. The heterogeneous reaction of Δ9-tetrahydrocannabinol (THC), a major component of cannabis smoke, with ozone was examined as a pure compound and within cannabis smoke. Oxidative decay via ozonolysis and product formation were monitored by liquid chromatography–tandem mass spectrometry. Epoxide, dicarbonyl, and secondary ozonide THC reaction products were detected from both pure THC and cannabis experiments, with the product ratios dependent on relative humidity. The observed reaction kinetics for loss of THC on glass and cotton surfaces are consistent with a relatively short loss lifetime, which will be strongly dependent on the film thickness, ozone mixing ratio, and ozone reactivity of the surface substrate. The low volatility of THC and its oxidation products suggest that their contributions to thirdhand cannabis smoke will be less significant than the role that nicotine plays in thirdhand tobacco smoke.

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“…The predicted q m from the Langmuir model at ambient temperature is 194.2 mg g -1 , while at 65°C the value increased to 323.4 mg g -1 , which could be due to the swelling of the adsorbent particle that lead to an increase in surface area at higher temperature [44]. As summarised in Table 4, AP is a better adsorbent for removal of MV than many of the agricultural residues, but its adsorbent capacity is lower when compared to Pu-erh tea, duckweed (a floating aquatic macrophyte) and synthetic adsorbent (Fe 3 O 4 magnetic nanoparticle) at ambient temperature.…”

Section: Isotherm Studiesmentioning

confidence: 85%

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

Kooh

Lim

Dahri

et al. 2015

Waste Biomass Valor

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Azolla pinnata (AP), a floating aquatic macrophyte, was studied as a potential adsorbent for the removal of methyl violet (MV) in a batch adsorption system. Surface characterisation, effects of particle size, adsorbent dosage, pH, ionic strength and pre-treatments of adsorbent were carried out. The study of the effects of pH and ionic strength suggested that electronic interaction and hydrophobic-hydrophobic interaction might be the major forces of dye interaction. Pseudo 2nd order kinetic model best-fitted the kinetic data indicating that the adsorption process may be controlled by chemical process. The Weber-Morris and Boyd models were used for describing the diffusion mechanism which showed that intraparticle diffusion was not the rate limiting step, and film diffusion or in combination of other mechanisms might be in control. Isotherm modelling showed that the Langmuir model best-fitted the experimental data with q m of 194.2 mg g -1 at 25°C and 323.4 mg g -1 at 65°C. Thermodynamic studies showed that the adsorption process is endothermic, spontaneous and with significant change to the internal structure of adsorbent. The estimated activation energy by Arrhenius equation is 54.8 kJ mol -1 , which indicates that the adsorption process may be controlled by chemical process. Adsorbent regenerated using NaOH displayed retention of high adsorption capability almost similar to fresh adsorbent even after five consecutive cycles. Ability to regenerate coupled with good adsorption capability suggests that AP has great potential to be utilised as a low-cost adsorbent for the removal of MV in real life application.

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Surface areas of cottons and modified cottons before and after swelling as determined by nitrogen sorption

Cited by 17 publications

References 10 publications

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

Heterogeneous Ozonolysis of Tetrahydrocannabinol: Implications for Thirdhand Cannabis Smoke

Azolla pinnata: An Efficient Low Cost Material for Removal of Methyl Violet 2B by Using Adsorption Method

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