Remediation of wastewater containing heavy metals using raw and modified diatomite

Khraisheh, Majeda; Al‐Degs, Yahya S.; McMinn, W.A.M.

doi:10.1016/j.cej.2003.11.029

Cited by 346 publications

(147 citation statements)

References 38 publications

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“…La cercanía entre los datos experimentales y los calculados con el modelo se evalúa por los coeficientes de correlación (R 2 valores cercanos o igual a 1, indica que el modelo describe con éxito el proceso) [14]. Los modelos de YoonNelson desarrollado en 1984, Thomas en 1948, y el modelo Bohart-Adams propuesto por Bohart y Adams en 1920, se aplican con frecuencia para modelar las curvas de ruptura para la adsorción de iones metálicos [15]. Los modelos …”

Section: Modelos De Adsorción En Sistemas Continuosunclassified

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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Section: Modelos De Adsorción En Sistemas Continuosunclassified

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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“…As a consequence, this material has high porosity and thus high permeability, high surface area, and low density. These properties make this material particularly interesting as a heavy metal adsorbant for contaminant removal [51] and for catalysis e.g., for the generation of phenol [52], as a catalytic substrate [53]. All these process are dependent on the interconnectivity of the porosity and accessibility of the surface area, thus 3D visualization can provide a wealth of information about how gases and liquids can permeate these materials.…”

Section: Introductionmentioning

confidence: 99%

Nano-Tomography of Porous Geological Materials Using Focused Ion Beam-Scanning Electron Microscopy

Liu

Huis

et al. 2016

Minerals

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Tomographic analysis using focused ion beam-scanning electron microscopy (FIB-SEM) provides three-dimensional information about solid materials with a resolution of a few nanometres and thus bridges the gap between X-ray and transmission electron microscopic tomography techniques. This contribution serves as an introduction and overview of FIB-SEM tomography applied to porous materials. Using two different porous Earth materials, a diatomite specimen, and an experimentally produced amorphous silica layer on olivine, we discuss the experimental setup of FIB-SEM tomography. We then focus on image processing procedures, including image alignment, correction, and segmentation to finally result in a three-dimensional, quantified pore network representation of the two example materials. To each image processing step we consider potential issues, such as imaging the back of pore walls, and the generation of image artefacts through the application of processing algorithms. We conclude that there is no single image processing recipe; processing steps need to be decided on a case-by-case study.

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“…Aluminosilicates like diatomite, kaolinite, bentonite and etc. [13,14,22] can be interesting to study as sorbents for waste water treatment due to their folded structure which is reflected in high dispersity, hydrophilicity and good ion exchange properties. Moreover, they are low cost sorbents with excellent sources of raw materials.…”

Section: Introductionmentioning

confidence: 99%

“…Diatomite (SiO2·nH2O), or diatomaceous earth, is a soft lightweight rock available in large deposits around the world [22]. This pale colored sedimentary rock consists principally of silica microfossils of aquatic, unicellular alga varying in shape and size of diatom [26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Triclosan adsorption from model system by mineral sorbent diatomite

Sharipova

Aidarova

Bekturganova

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Remediation of wastewater containing heavy metals using raw and modified diatomite

Cited by 346 publications

References 38 publications

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

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

Nano-Tomography of Porous Geological Materials Using Focused Ion Beam-Scanning Electron Microscopy

Triclosan adsorption from model system by mineral sorbent diatomite

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