Adsorption behavior of cadmium ions onto phosphoric acid-impregnated microwave-induced mesoporous activated carbon

Tan, I.A.W.; Chan, Jou Chin; Hameed, B.H.; Lim, Leonard Lik Pueh

doi:10.1016/j.jwpe.2016.10.007

Cited by 63 publications

(18 citation statements)

References 65 publications

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“…To put it other words, higher concentration implies more metal ions fixed on the surface of the adsorbent (Akpomie et al 2018). A possible explanation may be that increasing the concentration of metal ions in solution causes an increase in mass transfer due to the increment of driving force for the transportation of ions from solution to the carbon surface (Tan et al 2016). Figure 9 is used for explaining the contact time and temperature dependency of uptake amounts in the case of 400 mg/L initial metal ion concentration.…”

Section: Effect Of Concentration Temperature and Contact Time For Pmentioning

confidence: 99%

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

et al. 2019

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The purpose of this study was to produce activated carbons (ACs) from chickpea (Cicer arietinum) husks by chemical activation (KOH and K 2 CO 3) and to examine their feasibility in removing heavy metals from aqueous solutions. In the case of KOH impregnation with a ratio of 50 wt%, the most developed porosity was achieved, with a BET surface area of 2082 m 2 /g and a total pore volume of 1.07 cm 3 /g. By using the product, the maximum adsorption capacities were found to be 135.8, 59.6, and 56.2 mg/g for Pb(II), Cr(VI), and Cu(II), respectively. The experimental data were analyzed by various adsorption isotherm and kinetic models. Thermodynamic parameters such as ΔG°, ΔH°, and ΔS° were also calculated. The results obtained in this study shows that adsorption onto chickpea-husk-derived activated carbon was endothermic and spontaneous for the removal of heavy metals from aqueous solutions.

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Section: Effect Of Concentration Temperature and Contact Time For Pmentioning

confidence: 99%

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

et al. 2019

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“…The adsorption isotherm indicates how the adsorption molecules distribute between the liquid phase and the solid phase when the adsorption process reaches an equilibrium state. The analysis of the isotherm data by fitting them to different isotherm models is an important step to find the suitable model that can be used for design purposes . Adsorption isotherm is basically important to describe how solutes interact with adsorbents, and is critical in optimizing the use of adsorbents .…”

Section: Resultsmentioning

confidence: 99%

“…The analysis of the isotherm data by fitting them to different isotherm models is an important step to find the suitable model that can be used for design purposes . Adsorption isotherm is basically important to describe how solutes interact with adsorbents, and is critical in optimizing the use of adsorbents . In this study, the adsorption isotherm experiments of H 2 S and CH 3 COOH on NaOH/AC filter were carried out by varying the initial concentrations (400, 800, 1600, 2400, and 3200 ppm for H 2 S; 400, 800, 1200, 1600, and 2000 ppm for CH 3 COOH) under the optimized conditions (humidity 60.00%, temperature 20°C).…”

Section: Resultsmentioning

confidence: 99%

Adsorption of acetic acid and hydrogen sulfide using NaOH impregnated activated carbon for indoor air purification

Wang

Nam

Gebreegziabher

et al. 2020

Engineering Reports

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Excessive exposure to hydrogen sulfide (H 2 S) and acetic acid (CH 3 COOH) gases is extremely dangerous in a confined space. An effective indoor air pollutant removal porous carbon filter was developed using NaOH impregnated on activated carbon (NaOH/AC) for the adsorption of H 2 S and CH 3 COOH. Activated carbon (NaOH/AC) filter was characterized using various methods, indicating good physical and chemical properties (especially -OH functional groups) for the adsorption of air pollutants. The prepared NaOH/AC filter was cured at different curing temperatures and residence times to understand the effect of the curing conditions on the adsorption performance. The best results were obtained with NaOH/AC filter cured at 100 • C for 20 minutes as it eliminated the initial concentration of 400 ppm of CH 3 COOH in 15 minutes and H 2 S in 30 minutes at 20 • C and 60% relative humidity. Isotherm and kinetic models were used to analyze the adsorption process. Langmuir isotherm and pseudo-second order kinetic models provided the best fit to the adsorption of CH 3 COOH and H 2 S on NaOH/AC filter. The adsorption mechanism was controlled by the intraparticle diffusion combined with film diffusion. The maximum adsorption capacity of NaOH/AC filter was 473 mg/g for H 2 S adsorption, and 550 mg/g for CH 3 COOH adsorption. In addition, the spent NaOH/AC filter was regenerated for reuse.This study is expected to develop low-cost and effective porous carbon filter using NaOH-modified activated carbon for indoor air purification.

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“…The conventional processes for removing cadmium from aqueous solution include chemical precipitation, ion exchange, membranes and adsorption technologies [2]. Among these different physicochemical processes, adsorption has shown to be the best prospects owing to its economic feasibility [3]. Today the oil shale has received increasing interest in the removal of heavy metals.…”

Section: Methodsmentioning

confidence: 99%

Modeling Using the Response Surface Methodology the Activation Process of Moroccan Oil Shale for Removal of Cd (II)

Elhammoudi¹,

Oumam²,

Abourriche³

et al. 2018

Int. J. Chem. Sci

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Adsorption behavior of cadmium ions onto phosphoric acid-impregnated microwave-induced mesoporous activated carbon

Cited by 63 publications

References 65 publications

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Chemically activated carbon production from agricultural waste of chickpea and its application for heavy metal adsorption: equilibrium, kinetic, and thermodynamic studies

Adsorption of acetic acid and hydrogen sulfide using NaOH impregnated activated carbon for indoor air purification

Modeling Using the Response Surface Methodology the Activation Process of Moroccan Oil Shale for Removal of Cd (II)

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