Techniques Employed in the Physicochemical Characterization of Activated Carbons

Durán‐Valle, Carlos J.

doi:10.5772/39366

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…The spectral lines obtained at different band areas indicate that there are various functional groups on the surface of the sorbents. The FTIR spectra of RL and CL as shown in Figure 3(a) show broad band which peaks at 3270 cm -1 and represents O-H stretch of the alcohol group [60]. The medium peaks at 2911 and 2841 cm −1 represent C-H stretch of the aliphatic group [61].…”

Section: Resultsmentioning

confidence: 99%

Sequestration of Hazardous Dyes from Aqueous Solution Using Raw and Modified Agricultural Waste

Jegede

Durowoju

Edokpayi

2021

Adsorption Science & Technology

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The continuous degradation of surface water quality by dye materials is of concern globally. Agricultural waste Litchi chinensis (LC) peel in its raw (RL) and modified (CL) forms was used as potential sorbents for sequestration of Congo red (CR) dye from an aqueous solution. The sorbents were characterized before and after sorption with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer, Emmett, and Teller (BET) surface area analysis, and X-ray diffraction (XRD). Determination of the point of zero charge (PZC) suggested CR dye sorption from an aqueous solution would be best in acidic pH. Batch experimental drivers such as the effects of time, dosage, initial concentration, pH, and temperature were optimized and used. Results from the study showed that modification with citric acid (CA) reduced the equilibration time from 90 to 15 min. Change in water chemistry did not significantly affect the removal efficiency of the sorbent but rather slightly improved it for both sorbent types. The smaller particle size of <125 μm recorded higher removal efficiency than the larger one (>125 μm). The effect of temperature affects the sorption differently. For the RL system, it decreases with an increase in the temperature, while for the CL system it increases with an increase in temperature. The Langmuir isotherm best described the equilibrium data obtained based on the linearized coefficients with maximum sorption capacities ( q max ) of 55.56 mg/g (RL) and 58.48 mg/g (CL). The pseudo-second-order model also best described the kinetic data. The thermodynamics study showed that the reaction is both feasible and spontaneous. Both sorbents recorded high removal efficiency for other dyes such as rhodamine B, methylene blue, methyl orange, malachite green, and erythrosin B. The five cycled regeneration/sorption experiments with 0.1 M NaOH as the desorbing agent showed that the regenerated sorbents efficiently removed CR dye from an aqueous solution close to their virgin samples for the first three cycles. This research, therefore, establishes LC peel as a potential eco-friendly, readily available, and effective sorbent for sequestration of hazardous dyes from wastewater.

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Section: Resultsmentioning

confidence: 99%

Sequestration of Hazardous Dyes from Aqueous Solution Using Raw and Modified Agricultural Waste

Jegede

Durowoju

Edokpayi

2021

Adsorption Science & Technology

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Isotherm and Thermodynamic Analysis of Carbon Dioxide on Activated Carbon

Rashidi

Yusup

Borhan

2016

Procedia Engineering

124

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The potential of palm kernel shell activated carbon as an adsorbent for β-carotene recovery from crude palm oil

Ulfah

Raharjo

Hastuti

et al. 2016

AIP Conference Proceedings

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The effect of early posthatch local feed in pectoralis muscle of Jawa Super chicks (Gallus gallus domesticus) AIP Conference Proceedings 1755, 140003 (2016) Abstract. The study aimed to obtain of palm kernel shell activated carbon (PKSAC) potentially as an adsorbent for recovery of β-carotene from crude palm oil. Activation of palm kernel shell carbon was done chemically using phosphoric acid at impregnation ratio of 3 (ml/g) for 24 hours and carbonization at 500 o C for 30 min and 60 min called PKSAC30 and PKSAC60 respectively. The results showed that the yield of PKSAC30 and PKSAC60 were 48.82% and 47.67%, the surface area were 1665.823 and 1680.877 m 2 /g respectively, whereas surface area of decolorized activated charcoal (DAC) as control activated carbon was 1068.391 m 2 /g. PKSAC30 able to adsorb β-carotene in isopropyl alcohol at the equilibrium as much as 14.32 mg/g, while the DAC as much as 21.58 mg/g. Desorption of β-carotene from DAC using tetrahydrofuran reached 49.99%, while from PKSAC30 reached 28.30%.

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Techniques Employed in the Physicochemical Characterization of Activated Carbons

Cited by 3 publications

References 44 publications

Sequestration of Hazardous Dyes from Aqueous Solution Using Raw and Modified Agricultural Waste

Sequestration of Hazardous Dyes from Aqueous Solution Using Raw and Modified Agricultural Waste

Isotherm and Thermodynamic Analysis of Carbon Dioxide on Activated Carbon

The potential of palm kernel shell activated carbon as an adsorbent for β-carotene recovery from crude palm oil

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