Kinetic and thermodynamic aspects of cadmium adsorption onto raw and activated guava (<i>Psidium guajava</i>) leaves

Abdelwahab, Ola; Fouad, Y.O.; Amin, N.K.; Mandor, Hagar

doi:10.1002/ep.11991

Cited by 34 publications

(19 citation statements)

References 28 publications

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“…This is quite similar to the Fig. 1 a SEM image of unmodified Guava leaves biosorbent at ×7500 magnification [24]. b SEM image of modified Guava leaves biosorbent at ×7500 magnification [24] observations of Abedi et al [26] albeit for aloe vera.…”

Section: Teasupporting

confidence: 88%

“…1 a SEM image of unmodified Guava leaves biosorbent at ×7500 magnification [24]. b SEM image of modified Guava leaves biosorbent at ×7500 magnification [24] observations of Abedi et al [26] albeit for aloe vera. Bajpai and Jain [29] also examined spent tea leaves at a lower magnification of 50× and 800× (images not shown).…”

Section: Teamentioning

confidence: 96%

“…It is also to ensure reproducibility of the results. Also, a few studies did not mention the model of SEM machine used in their study [23,24].…”

Section: Instrumentation Of Scanning Electron Microscopymentioning

confidence: 99%

“…Abdelwahab et al [24] studied the morphology of unmodified and modified guava leaves biosorbent. The SEM image of the unmodified biosorbent is shown in Fig.…”

Section: Guava (Psidium Guajava)mentioning

confidence: 99%

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A mini-review of the morphological properties of biosorbents derived from plant leaves

Ighalo

Adeniyi

2020

SN Appl. Sci.

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A key feature of biosorption studies is the utilisation of different analytical techniques to evaluate several aspects of the process. Scanning electron microscopy (SEM) is used to study the morphology features of biosorbents. In this mini-review, research efforts by scientists in evaluating the morphological properties of plant leaves biosorbents was discussed. The way in which results have been interpreted and what inferences have been deduced was also discussed. Biosorbents obtained from plant leaves generally possess heterogeneous and irregular surface containing a variety of cavities, holes, voids, cracks, interstices and convolutions. NaOH pre-treatment (also known as mercerisation) helps to remove lignin and oil from the biomass as well as increasing the roughness of the base cellulose. Smoother surfaces with fewer features are observed after sorption of some chemical species (be it pollutants or a modification agent). It was observed that impregnation with nanoparticles usually leads to nanoparticle macro-clusters observable at high resolutions while any previously observed cavities, holes, ruptures and voids tends to disappear. Carbonisation and calcination gives a more porous adsorbent. Chemical modification despite reducing the total surface area of the adsorbent can actually increase the adsorption capacity due to adjustments in functional groups, effects on the solution chemistry and the improvement of the inherent affinity of the biosorbent due to the modification. SEM analysis is even more important in recent times where the functionalisation of adsorbents and biosorbents is a common practice.

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Section: Teasupporting

confidence: 88%

Section: Teamentioning

confidence: 96%

“…It is also to ensure reproducibility of the results. Also, a few studies did not mention the model of SEM machine used in their study [23,24].…”

Section: Instrumentation Of Scanning Electron Microscopymentioning

confidence: 99%

“…Abdelwahab et al [24] studied the morphology of unmodified and modified guava leaves biosorbent. The SEM image of the unmodified biosorbent is shown in Fig.…”

Section: Guava (Psidium Guajava)mentioning

confidence: 99%

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A mini-review of the morphological properties of biosorbents derived from plant leaves

Ighalo

Adeniyi

2020

SN Appl. Sci.

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“…Las Figuras 2 y 3, muestran los cambios en el espectro de las muestra antes y después del proceso de adsorción de los metales Pb y Cd, en el primero se puede observar una banda sólida y amplia, centrada en 3500cm -1 correspondiente a las vibraciones O-H debido al estiramiento de alcoholes, fenoles y ácidos carboxílicos en la Pectina, Celulosa, y Lignina. Por lo tanto, se estableció la presencia de hidroxilos "libre" en la superficie adsorbente tal como lo reporta Abdelwahab en 2015 [24]. Además, de un pico en 1500cm -1 asociado con el contenido de hemicelulosa de la biomasa [25].…”

Section: Resultados Y Discusiónunclassified

Adsorción de plomo y cadmio en sistema continuo de lecho fijo sobre residuos de cacao

Lara¹,

Tejada²,

Villabona³

et al. 2016

rev.ion

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Adsorción de plomo y cadmio en sistema continuo de lecho fijo sobre residuos de cacao Adsorption of lead and cadmium in continuous of fixed bed on cocoa wasteAdsorção de chumbo e cádmio no sistema de leito fixo contínua relativa aos resíduos de cacau Resumen Se evaluó el desempeño de la cáscara de cacao como material residual adsorbente de metales pesados (Plomo y Cadmio) en solución acuosa sintética, mediante un sistema continuo de lecho fijo. El trabajo experimental consistió en determinar el efecto de la altura del lecho en la remoción de estos contaminantes, manteniendo constantes parámetros como el pH, velocidad de flujo y concentración inicial de los metales. Las pruebas de adsorción presentaron una remoción de 91,32 y 87,80% respectivamente para Pb y Cd después de transcurridos 4,5 h La medición de las concentraciones en solución acuosa de los iones metálicos se hizo por adsorción atómica. Se evaluó el ajuste de los modelos matemáticos de Thomas, Dosis-Respuesta, Adams-Bohart y BDST (Bed-Depht Service Time analysis), para predecir el comportamiento dinámico de la columna y obtener los parámetros cinéticos correspondientes. Para los modelos de Thomas y de Dosis-Respuesta, se observó que los valores de la capacidad inicial de adsorción, q 0 , disminuyeron al aumentar la altura del lecho, esto pudo deberse a una transferencia de masa más lenta, concentración más baja y aumento dela capacidad de adsorción, mientras que los modelos de Adams-Bohart y BDST, la capacidad de adsorción volumétrica, N 0 , decrece al aumentar el bioadsorbente en la columna. Los resultados presentados en este estudio indican que los residuos de cacao pueden ser usados para la remoción de metales pesados presentes en aguas residuales satisfactoriamente. Palabras clave: modelos matemáticos, curva de ruptura, bioadsorbente, mazorca de cacao. AbstractThe performance of the cocoa pod as adsorbent residual material heavy metals (Lead and Cadmium) in synthetic aqueous solution using a continuous fi xed bed system was evaluated. The experimental work was to determine the effect of bed height on the removal of these contaminants, keeping constant parameters such as pH, flow rate and initial concentration of metals. Adsorption tests showed a 91.32 and 87.80% removal, respectively, for Pb and Cd elapsed after 4.5h. Measuring concentrations in aqueous solution of metal ions was made by atomic adsorption. The adjustment of mathematical models evaluated Thomas, Dose-Response, Adams-Bohart and BDST (Bed-Depht Service Time analysis) was evaluated, to predict the dynamic behavior of the column and obtain the corresponding kinetic parameters. For models Thomas and dose response was observed that the values of the initial adsorption capacity, q 0 ,

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Value‐Added Products from Guava Waste by Biorefinery Approach

Pathak

Mandavgane

Kulkarni

2020

Biorefinery Production Technologies for Chemicals and Energy

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Kinetic and thermodynamic aspects of cadmium adsorption onto raw and activated guava (Psidium guajava) leaves

Cited by 34 publications

References 28 publications

A mini-review of the morphological properties of biosorbents derived from plant leaves

A mini-review of the morphological properties of biosorbents derived from plant leaves

Adsorción de plomo y cadmio en sistema continuo de lecho fijo sobre residuos de cacao

Value‐Added Products from Guava Waste by Biorefinery Approach

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