A multiple model approach for evaluating the performance of time-lapse capsules in trapping heavy metals from water bodies

Pan, Shu-Yuan; Syu, Wei-Jhan; Chang, Tay-Rong; Lee, Cheng-Hsun

doi:10.1039/d0ra03017a

Cited by 31 publications

(15 citation statements)

References 31 publications

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“…Although ion-exchange resin can be efficiently studied using a handheld XRF 12 or the cuvettes designed for peat and soil samples 11 , 13 , when sample volumes increase, the need for a streamlined processes becomes apparent. The new sample carrier has several advantages.…”

Section: Discussionmentioning

confidence: 99%

“…For this study, the cation-exchange resin Amberlite TM IR-120 (Rohm and Hass, USA) cf. 14 – 16 was chosen because it has already been deployed in at least two studies using resin sachets and XRF analysis 11 , 12 . About 4 g of the resin was filled into polyethylene (PE) net sachets that were then placed in standardized solutions prepared from Merck Certipur® ICP standards (Product numbers 1.11355.0100 and 1.70363.0100).…”

Section: Methodsmentioning

confidence: 99%

“…The adsorption of ions to the ion-exchange resin from a solution, and the calibration of the XRF counts of the resin relative to the concentrations of elements in the solution has been thoroughly evaluated in earlier studies 11 , 12 . However, these calibrations were developed for solutions containing primarily divalent cations.…”

Section: Methodsmentioning

confidence: 99%

“…This allowed a large area to be assessed, and contamination hotspots related to industries scattered around the farmland could be visualized using geographical information systems. A similar approach was followed by Pan et al 12 , but using a portable XRF.…”

Section: Introductionmentioning

confidence: 99%

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Potential and pitfalls of XRF-CS analysis of ion-exchange resins in environmental studies

Löwemark

Liao

Liou

et al. 2021

Sci Rep

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Detecting clandestine, intermittent release of heavy metal pollution into natural and man-made water ways is challenging. Conventional chemical methods are both labor intensive and expensive. A recent approach combining ion-exchange resins with the capabilities of X-ray fluorescence core scanners (XRF-CS) therefore is of great interest. In short, ion-exchange resin is deployed in the water using small sachets, the resin is then collected, dried, filled into sample holders and scanned using XRF-CS. Ion-exchange resins take up heavy metals in proportion to the concentration in the ambient water, with a correlation coefficient (R2) between concentration and XRF-CS counts better than 0.96 for most elements. However, a number of parameters influence the measurements. Different drying methods introduce differences in the XRF counts because of lattice bound water, resin shrinkage, and disaggregation of the resin particles. Furthermore, the newly developed sample carrier, which was constructed using 3D printed polymers, contains trace amounts of elements that may influence the sample measurements through edge effects and secondary fluorescence. In the tested sample carrier materials, substantial levels of Cr, Fe, Co, and Zn were detected, while Ca, Ti, Ni, Cu, Ga showed variable levels. Ba, Tl and Bi show very low levels, and Pb is only of importance in the PLA carrier. It is therefore necessary to streamline the analysis-process to ensure that the variations in sample treatment and drying and filling methods are minimized. It is also recommended that only spectra from the center of the compartments are used for the evaluation to avoid edge effects caused by secondary fluorescence of metals in the compartment walls. Although the technique of using ion-exchange resin sachets and XRF-CS analysis is only semi-quantitative, it is a cost effective and fast way to monitor large areas for environmental pollution, and the new sample carrier greatly contributes to make the process faster and less error prone.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential and pitfalls of XRF-CS analysis of ion-exchange resins in environmental studies

Löwemark

Liao

Liou

et al. 2021

Sci Rep

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“…Therefore, it reveals a vital significance and urgency to reduce the contents of Cr (VI) in aquatic environment to an approved level for life health and safety. In recent researches, several advances spring up on the treatments to remove Cr (VI), such as physico-chemical adsorption, ion exchange under electric field, sol–gel and membrane separation [12–15]. For large-scale application and production cost reduction, adsorption technique is regarded as the most effective method [16–18].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale zero-valent iron loaded vermiform expanded graphite for the removal of Cr (VI) from aqueous solution

et al. 2021

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Cr (VI) is indispensable in industrial manufacturing, and its extensive use leads to severe heavy-metal pollution in the water environment around people, posing a great danger to physical health and living environment of multitudinous organisms. Expanded graphite (EG) is considered as a typical material for adsorption, while nanoscale zero-valent iron (nZVI) can be applied to degrade and sedimentate various organic or inorganic pollutants. In this study, a simultaneous collaboration of EG and nZVI is carried out, with the investigation on the influence of different test conditions for adsorption performances. These findings demonstrate that nZVI@EG manifests favourable adsorptive performance on the removal of hexavalent chromium efficiently. nZVI, acting as an electron donor, is supposed to reduce Cr (VI) to Cr (III), turning itself into iron oxide or hydroxide. The whole process is an exothermic reaction, accompanying chemical reduction and physical adsorption. And Cr (III) is fastened on the appearance by deposition of chromium hydroxide or ferrochromium complex precipitation, which greatly reduces the total chromium content in the aqueous solution. Herein, as a new composite adsorbent, nZVI@EG shows promising prospects of practical applications in water contamination and environmental remediation.

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Mass Transfer Kinetics and Mechanisms of Phosphate Adsorbed on Waste Mussel Shell

Salim

Fulazzaky

Puteh

et al. 2022

Water Air Soil Pollut

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A multiple model approach for evaluating the performance of time-lapse capsules in trapping heavy metals from water bodies

Abstract: This article applies multiple approaches for evaluating the effect of operating factors on the adsorption of heavy metals from watershed using time-lapse capsules.

Cited by 31 publications

References 31 publications

Potential and pitfalls of XRF-CS analysis of ion-exchange resins in environmental studies

Potential and pitfalls of XRF-CS analysis of ion-exchange resins in environmental studies

Nanoscale zero-valent iron loaded vermiform expanded graphite for the removal of Cr (VI) from aqueous solution

Mass Transfer Kinetics and Mechanisms of Phosphate Adsorbed on Waste Mussel Shell

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