Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand

Khamis, Mustafa; Jumean, F.H.; Abdo, Naser

doi:10.1016/j.jhazmat.2009.04.053

Cited by 41 publications

(22 citation statements)

References 22 publications

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“…High removal efficiencies with zeolites was observed even for 1000 ppm Pb(II) solutions. At this concentration, 100% removal was attained with zeolite dosages above 2.5 g/0.100 dm 3 . Maximum adsorbent capacities for Table 3, correspond to optimal efficiency for this class of adsorbers.…”

Section: Removal Efficienciesmentioning

confidence: 90%

“…For kaolinite, silica and alumina, 100% removal efficiencies could only be attained with low (30 ppm) Pb(II) concentrations and at adsorbent dosages higher than 3.0 g/0.100 dm 3 . High removal efficiencies with zeolites was observed even for 1000 ppm Pb(II) solutions.…”

Section: Removal Efficienciesmentioning

confidence: 97%

“…Zeolite efficiencies follow the order Hannon > Mikawer > Aritain and that for porcelanite is second to Hannon. The three zeolites, porcelanite and yellow sand are capable of completely removing lead from solutions containing 300 ppm Pb(II) at adsorbent dosages in the range 0.6 -1.0 g/0.100 dm 3 . Other adsorbents are less efficient and follow the order white sand > red sand > kaolinite > silica > alumina.…”

Section: Removal Efficienciesmentioning

confidence: 99%

“…Column filtration and batch equilibrium by low cost adsorbents are the most common methods used in removing Pb(II) and other toxic heavy metals from wastewaters. UAE sands were shown to be efficient adsorbents for the removal and recovery of Pb(II) and other heavy metals from aqueous solutions [1] [2], and for the removal and speciation of Cr(III) and Cr(VI) [3] [4]. Reports on heavy metal removal from solutions by sawdust [5], eggshell [6], bentonite, molasses and fly ash [7] have also included X-ray fluorescence (XRF) data on these adsorbents.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Pb(II) from Aqueous Solutions by Zeolites, Porcelanite and Sands: Correlation of Morphology and Chemical Composition to Batch Removal Efficiency

Jumean¹,

Pappalardo²,

Khoury³

2015

AJAC

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Chemical compositions of natural zeolites, porcelanite (opal-CT) and local sands were determined by X-ray fluorescence (XRF) and correlated with their Pb(II) removal efficiencies. Zeolites and porcelanite were from the Mikawer, Aritain and Hannon areas in Jordan. Sands (white, red and yellow) were from the United Arab Emirates (UAE). The effect of Pb(II) concentration and zeolite dosage on removal efficiency was investigated at 25.0˚C using the batch equilibrium method. Commercial kaolinite, silica and alumina were also studied for comparison. Removal efficiencies, in mg Pb(II)/g adsorbent, were: 76.9, 52.7 and 42.1 for Hannon, Mikawer and Aritain zeolites, respectively; 58.2 for porcelanite; 29.7, 11.0 and 8.5 for yellow, red and white sand, respectively; 7.2, 3.3 and 1.3 for kaolinite, silica and alumina, respectively. XRF data indicate that adsorbents with intermediate molar ratios of Si/Al, in the range 2.70 -2.93, are most efficient in Pb(II) removal. Scanning electron microscope (SEM) images of adsorbents suggest that morphology, in addition to chemical composition, plays a key role. In particular, a combination of factors, including shapes and sizes of crystals, channels in zeolites and pores in porcelanite, appear to favor removal of Pb(II).

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Section: Removal Efficienciesmentioning

confidence: 90%

Section: Removal Efficienciesmentioning

confidence: 97%

Section: Removal Efficienciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Pb(II) from Aqueous Solutions by Zeolites, Porcelanite and Sands: Correlation of Morphology and Chemical Composition to Batch Removal Efficiency

Jumean¹,

Pappalardo²,

Khoury³

2015

AJAC

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“…The removal efficiency of several heavy metals from aqueous mixtures by sands from the United Arab Emirates (UAE) has been investigated and reported by researchers from this laboratory (Pappalardo et al, 2010;Khamis et al, 2009). A recent issue of interest is the possibility of recovery of heavy metals from substrates.…”

Section: Introductionmentioning

confidence: 99%

Removal and Recovery of Lead from Aqueous Solution by Low Cost Media

Pappalardo¹

2011

American Journal of Environmental Sciences

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Problem statement: To remove Pb(II) from wastewater using local UAE sand and then to recover the removed Pb(II). Approach: Removal efficiency of Pb(II) from wastewater was investigated using white, yellow and red United Arab Emirates sand with pore sizes < 300 μm. Two methods were employed: batch equilibrium and column filtration. In the batch equilibrium study, the effect of sand type and dosage on Pb(II) removal efficiency was investigated. In the column filtration study, removal efficiencies were measured using yellow sand at 0.100 dm 3 intervals while continuously injecting 300 ppm Pb(II) solution into the column. Pb(II) concentrations were determined using inductively coupled plasma-atomic emission spectrometer (ICP-AES). Measurements were carried out until saturation of the column by Pb(II) was attained. Recovery efficiency of Pb(II) was initially investigated using distilled water, 0.100 mol dm −3 HNO 3 and pH 8.0 aqueous solutions.Recovery via chelation with Ethylenediaminetetraacetic Acid (EDTA) was then attempted. Results: Batch experiments showed that yellow sand was more efficient than either white or red sand in removing Pb(II), with a maximum removal capacity of 0.030 kg Pb(II) per kg yellow sand. Accordingly, yellow sand was selected for column filtration experiments. In column filtration, the removal capacity rose to a maximum of 0.086 kg Pb(II) per kg sand. When sand containing removed Pb(II) in batch experiments was equilibrated overnight with EDTA solutions in stoichiometric excess, 86.6% recovery was observed. By comparison, recovery using EDTA in column filtration was 94.7%. Recovery by injection of either water or 0.100 mol dm −3 HNO 3 solution was either negligible or much lower than that obtained with EDTA. Conclusion: Column filtration using UAE yellow sand is an efficient and inexpensive method to remove Pb(II) from wastewaters. Pb(II) can be efficiently recovered from yellow sand columns by chelation with EDTA.

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Conclusions

2011

A Guide to the Economic Removal of Metals From Aqueous Solutions

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Speciation and removal of chromium from aqueous solution by white, yellow and red UAE sand

Cited by 41 publications

References 22 publications

Removal of Pb(II) from Aqueous Solutions by Zeolites, Porcelanite and Sands: Correlation of Morphology and Chemical Composition to Batch Removal Efficiency

Removal of Pb(II) from Aqueous Solutions by Zeolites, Porcelanite and Sands: Correlation of Morphology and Chemical Composition to Batch Removal Efficiency

Removal and Recovery of Lead from Aqueous Solution by Low Cost Media

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