Studies on castor seed shell as a sorbent in basic dye contaminated wastewater remediation

Oladoja, N.A.; Aboluwoye, Christopher Olumuyiwa; Oladimeji, Y. B.; Ashogbon, Adeleke Omodunbi; Otemuyiwa, I.O.

doi:10.1016/j.desal.2007.06.025

Cited by 123 publications

(75 citation statements)

References 16 publications

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“…The exhaustion time at both flow rates did not significantly change; it dropped from 26 to 25 h. The adsorption capacity increased significantly when increasing the flow rate, so 80 mL/min was considered the best flow rate tested in this study. Neto et al (2011) and Oladoja et al (2008) made similar observations in their respective studies.…”

Section: Effect Of Flow Rate and Adsorption Capacity Of Adsorbent On supporting

confidence: 72%

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Man¹,

Akinbile²,

Jun³

2015

BioResources

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A study to assess the efficiency of coconut husks (CHs) in removing methylene blue (MB) dye from wastewaters in Malaysia was carried out. A fixed bed column adsorber was set up using flow rates of 40 and 80 mL/min, and the adsorbent (CH) was prepared using the base treatment method with NaOH as activating agent. Three different column bed depths (10, 20, and 25 cm) and unit weights of adsorbent (103, 213, and 260 g) were used. Two models, the bed depth service time (BDST) and Thomas models, were used to validate the adsorption capacity results and breakthrough curve. Changing the bed depth from 20 to 25 cm did not result in a significant change in adsorption capacity, therefore a 20-cm bed depth is recommended as the most efficient. Similarly, adsorption capacity increased as flow rates increased from 40 to 80 mL/min, indicating that a flow rate of 80 mL/min yielded optimum efficiency. The two models also provided predictions with good fits of the bed depth effect, the adsorption capacity, and the breakthrough curve of CH for MB removal.

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Section: Effect Of Flow Rate and Adsorption Capacity Of Adsorbent On supporting

confidence: 72%

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Man¹,

Akinbile²,

Jun³

2015

BioResources

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“…Natural clay minerals are low-cost materials due to their abundance in most continents of the world and possess a layered structure which can act as host materials with high sorption properties. Although clays themselves possess the high adsorption capabilities, the modification of their structure can successfully improve their capabilities [13].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Adsorption Capacity of Clay and Application in Dye Removal from Waste Water

Ogunmodede

Adebayo²,

Ojo

2014

ILCPA

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Natural clay has been considered as a potential absorbent for removing pollutants from water and waste water. Nonetheless, the effective application of clay for water treatment is limited due to small surface area and presence of net negative surface charge, leading to it low adsorption capacity. The absorption capacity was boosted via intercalation of CaO derived from snail shell (SS). The methylene blue sorption potential, PZC, and the surface area of unmodified clay sample were substantially enhanced by the intercalation process. The process of sorption of MB from solution was analyzed using five different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The value of the Langmuir monolayer sorption capacity qm (mg/g) increased from 50.12 to 88.71, PZC values increased from 4.50 to 7.40, and the surface area (m 2 /g) value increased from 27 m 2 /g to 123 m 2 /g after the intercalation process. The experimental data were fitted into two kinetic models: Lagergren pseudo-first order and the chemisorptions pseudo-second order. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (r2) better than pseudo first other kinetic models. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework.

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“…As mentioned above, this would affect the photocatalysis. 39 Because of the small dimensions of reaction chamber, it is difficult to measure the inner temperature directly. As an approximation, the temperature of the upper surface of reaction chamber is always monitored by a thermocouple during the experiment.…”

Section: Effects Of Light Source Intensity and Temperaturementioning

confidence: 99%

“…38 As reported in most work, due to the adsorption process of organic dye molecules onto the photocatalyst is endothermic, higher reaction temperature can improve the surface absorbability of photocatalyst and the oxidation activity of OH radicals, resulting in more effective decomposition of the water contaminants. 39 What is more, the photocatalytic degradation is always accompanied by self-thermolysis when the reaction temperature rises up. Therefore, it is more energy efficient if we can utilize the light and the heat from the light source at the same time.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

Wang¹,

Tan²,

Wan³

et al. 2014

Biomicrofluidics

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Photocatalytic water purification using visible light is under intense research in the hope to use sunlight efficiently, but the conventional bulk reactors are slow and complicated. This paper presents an integrated microfluidic planar reactor for visible-light photocatalysis with the merits of fine flow control, short reaction time, small sample volume, and long photocatalyst durability. One additional feature is that it enables one to use both the light and the heat energy of the light source simultaneously. The reactor consists of a BiVO 4 -coated glass as the substrate, a blank glass slide as the cover, and a UV-curable adhesive layer as the spacer and sealant. A blue light emitting diode panel (footprint 10 mm Â 10 mm) is mounted on the microreactor to provide uniform irradiation over the whole reactor chamber, ensuring optimal utilization of the photons and easy adjustments of the light intensity and the reaction temperature. This microreactor may provide a versatile platform for studying the photocatalysis under combined conditions such as different temperatures, different light intensities, and different flow rates. Moreover, the microreactor demonstrates significant photodegradation with a reaction time of about 10 s, much shorter than typically a few hours using the bulk reactors, showing its potential as a rapid kit for characterization of photocatalyst performance.

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Studies on castor seed shell as a sorbent in basic dye contaminated wastewater remediation

Cited by 123 publications

References 16 publications

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

Enhancing Adsorption Capacity of Clay and Application in Dye Removal from Waste Water

Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

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