Adsorption of Copper (II) From Aqueous Medium In Fixed-Bed Column By Kenaf Fibres

Man, Hasfalina Che; Maryam, Romsyah; Luqman, C. A.; Rashid, M.

doi:10.1016/j.apcbee.2012.06.079

Cited by 69 publications

(25 citation statements)

References 30 publications

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“…Figure 3 shows that the breakthrough time decreased with the increased flow rate. The breakthrough curve became steeper and achieved saturation faster as the flow rate was increased due to the lower contact time between the adsorbate and adsorbent [7,8]. According to Sotelo et al [7], there was not enough time for the adsorption equilibrium to be achieved at higher flow rates.…”

Section: Effect Of Flow Ratementioning

confidence: 99%

“…The performance of the column was remarkably influenced by the flow rate as it affected the contact time between the adsorbate and adsorbent. The Cd (II) ions had longer time to diffuse through the pores and achieved a higher adsorption capacity when the flow rate was decreased [7,8]. At higher flow rates, the decrease in liquid film surrounding the adsorbent particles led to the reduction of the boundary layer and the mass transfer resistance in adsorption process [7].…”

Section: Effect Of Flow Ratementioning

confidence: 99%

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2016

JASPE

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The spread of heavy metal pollution in the environment can lead to the contamination of crops and water for consumption. An approach to control the spread of groundwater pollution is by using a permeable reactive barrier with granular activated carbon. In this study, the adsorption of Cd(II) ions was conducted in a continuous flow fixed-bed column by using oil palm shell-derived activated carbon. The activated carbon column performance was evaluated by manipulating the activated carbon bed height, cadmium solution flow rate and influent concentration. The increase in bed height increased the amount of adsorbent used, thus increasing the total removal of Cd(II) and prolonged the lifespan of the activated carbon column. However, the increase in flow rate and influent concentration resulted in the shortened lifespan of the column. The column system with a bed height of 5.5 cm, flow rate of 2.0 mL/min and 200 mg/L influent concentration showed the best Cd(II) uptake performance in this study. The column performance were best fitted to the Thomas model and Yoon-Nelson model for the longest bed depth of 5.5 cm, all flow rates studied and highest influent concentration of 200 mg/L, with correlation coefficient greater than 0.95.

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Section: Effect Of Flow Ratementioning

confidence: 99%

Section: Effect Of Flow Ratementioning

confidence: 99%

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2016

JASPE

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“…As the flow rate increased, the breakthrough curve became steeper. In addition, the high flow rate reduced the volume of the treated solution, and the breakthrough point was reached before the resin had been saturated, as the results show in Figure .…”

Section: Resultsmentioning

confidence: 89%

“…This occurred due to the fact that the kinetics of the copper adsorption by the resin was favoured and these ions are more diffused in the resin . The increase in the flow rate decreases the copper adsorption, due to the fact that the contact time between the resin and the solution was insufficient for the diffusion of copper; consequently, the bed saturation was not reached and the bed service time was reduced . It should also be noted that flow rates lower than 1.5 BV/h have not been studied since this value is already lower, as proposed in the literature…”

Section: Resultsmentioning

confidence: 99%

Copper recovery from nickel laterite with high‐iron content: A continuous process from mining waste

et al. 2019

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The waste product from the hydrometallurgical processing of nickel laterite ores can contain valuable metals, making their recovery economically viable. However, the high‐impurities content, mainly iron, makes the process technically unfeasible. As a result, the separation of metals from the leach solution must be selective. Among the techniques available, the use of chelating resin is advantageous due to its selectivity and low energy consumption. Among the commercial chelating resins available, Dowex XUS 43605 has been shown to be highly selective for copper and can be used with a high impurities content. Although there are studies on the use of Dowex XUS 43605, none have evaluated a high impurities content and modelled a continuous process. For this reason, the aim of this work was to investigate copper recovery by a continuous process. The Dowex XUS 43605 chelating resin with HPPA functional group was used in ion‐exchange experiments. Column experiments were performed in two steps: loading (to recover copper) and elution (to obtain a copper‐rich solution). The removal of iron and the subsequent collection of copper were possible in a precipitation step using CaCO3. The results showed that the solution obtained from elution had a copper concentration that was 10 times higher than in the loading. All of the iron was removed from the elution solution at pH 3.5 with 5% of copper losses. Copper precipitation was possible at pH 5.5. From the results obtained, a proposed flowsheet for recovering copper was suggested.

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“…In the case of Cu(II)-retained PU/CaO-25, the pore volume increased over a range of pore sizes because of inter-particle spaces of metal precipitates. Table 3 shows the reported sorption capacities of Cu(II), Zn(II), Pb(II), and Ni(II) by various adsorbents in columns [12][13][14][16][17][18]37].…”

Section: Bet Surface Areamentioning

confidence: 99%

Facile and economic one-pot synthesis of rigid functional-polyurethane for the effective treatment of heavy metal-contaminated urban storm water run-off

Vafaeifard

Lee

Akib

et al. 2016

Desalination and Water Treatment

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A B S T R A C TIn this study, highly permeable rigid polyurethanes (PU) incorporating calcium oxide (CaO) (PU/CaO) composite materials were prepared via a facile and economic one-pot synthesis method and characterized for remediation of heavy metal-contaminated urban storm water run-off (USR) in a fixed-bed column. Column tests were conducted to investigate various parameters, and data were interpreted using the Bed Depth Service Time model to predict service time. Among the media tested, 25% CaO-incorporated PU (PU/CaO-25) had the highest adsorption capacity of Cu(II). PU/CaO-25 had about 2.5-fold higher rigidity (0.38 MPa) than a "typical" rigid polymer (0.15 MPa). Hydraulic conductivity tests showed PU/CaO-25 (avg. 0.4 mm) had a permeability (0.108 cm s −1 ) equivalent or higher than reference sands. Specific structural features of PU/CaO-25 and the remediation mechanism were also determined using FESEM/EDS, XRD, N 2 gas isotherm and chemical equilibrium modeling. Moreover, column tests using simulated USR showed that all heavy metals were removed by PU/CaO-25 to below their regulation levels at~1,100 bed volumes. Based on the physicochemical properties and functionality, PU/CaO-25 may be useful as an effective filter material in USR treatment and reuse applications.

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Adsorption of Copper (II) From Aqueous Medium In Fixed-Bed Column By Kenaf Fibres

Cited by 69 publications

References 30 publications

Untitled

Untitled

Copper recovery from nickel laterite with high‐iron content: A continuous process from mining waste

Facile and economic one-pot synthesis of rigid functional-polyurethane for the effective treatment of heavy metal-contaminated urban storm water run-off

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