Study of quench effect on heavy metal uptake efficiency by an aluminosilicate-based material

Ning, Chao; Meng, Xu; Hui, David Chi-Wai; Lin, Carol Sze Ki; McKay, Gordon

doi:10.1016/j.cej.2016.11.078

Cited by 20 publications

(3 citation statements)

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“…A few studies [ 10 , 28 , 29 , 30 ] reported that heavy metal cations with low electronegativity can be easily replaced in aluminosilicate-based materials by others with higher electronegativity. For example, Xu et al [ 29 ] found that Pb 2+ was adsorbed on synthetic cancrinite by replacing Cd 2+ , due to its high electronegativity, as compared to Cd 2+ .…”

Section: Introductionmentioning

confidence: 99%

Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

et al. 2021

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The adsorption capacity of synthetic NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ in single and multi-component systems were investigated. The effects of electronegativity and hydration energy on the selective adsorption, as well as potential selective adsorption mechanism of the NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ were also discussed. The maximum adsorption capacity order of the heavy metals in the single system was Pb2+ > Cd2+ > Cu2+ > Zn2+, and this could be related to their hydration energy and electronegativity. The values of the separation factors (α) and affinity constant (KEL) in different binary systems indicated that Pb2+ was preferentially adsorbed, and Zn2+ presented the lowest affinity for NaX zeolite. The selective adsorption capacities of the metals were in the order, Pb2+ > Cd2+ ≈ Cu2+ > Zn2+. The trend for the selective adsorption of NaX zeolite in ternary and quaternary systems was consistent with that in the binary systems. Pb2+ and Cu2+ reduced the stability of the Si-O-Al bonds and the double six-membered rings in the NaX framework, due to the high electronegativity of Pb2+ and Cu2+ than that of Al3+. The selective adsorption mechanism of NaX zeolite for the high electronegative metal ions could mainly result from the negatively charged O in the Si-O-Al structure of the NaX zeolite, hence heavy metal ions with high electronegativity display a strong affinity for the electron cloud of the oxygen atoms in the Si-O-Al. This study could evaluate the application and efficiency of zeolite in separating and recovering certain metal ions from industrial wastewater.

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Section: Introductionmentioning

confidence: 99%

Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

et al. 2021

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“…We speculate that it is the result of the mass effect, which originates from the binding of heavier Sn and O atoms with the EDTA molecule. 42,43 It is worth noting that the asymmetrical stretching and stretching vibration of −NH 2 appear at 3395 and 3203 cm −1 , 44 and the amide III bonds (1256 cm −1 ), which is the C−N bond in the OC−N structure, emerges from the SEAC powder, indicating the formation of primary amide groups in the SEAC powder. 45 Based on the above FTIR results, we consider the EDTA molecule to combine with SnO 2 nanoparticles, 30 and then the terminal −COOH groups are transformed into primary amide groups after introducing the ammonia aqueous solution.…”

Section: Resultsmentioning

confidence: 99%

Tailoring the Energy Band Structure and Interfacial Morphology of the ETL via Controllable Nanocluster Size Achieves High-Performance Planar Perovskite Solar Cells

Wang

Sang

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Planar-type perovskite solar cells (p-PSCs) based on SnO 2 have garnered further attention due to their simple and lowtemperature fabrication. Improving the critical properties of the electron transport layer (ETL) is an effective way to enhance the performance of p-PSC devices. Here, a brand-new method is developed to relieve the contact recombination caused by the rough fluorine-doped tin oxide (FTO) surface and further boosts the electrical concentration of the ETL. A SnO 2 −ethylene diamine tetraacetic acid (EDTA) acylamide compound (SEAC) with hydrogen bond-induced adjustable cluster size is reported for the first time. The rational choice of the SEAC cluster size is the key for obtaining the smooth interfacial morphology of the ETL on the rugged FTO substrate. In addition, the energy band gap decreases with the increasing cluster size, and consequently, results in improved electrical conductivity of the SEAC. The upshifted Fermi energy level leads to higher electron concentration, which is an important physical quantity of the ETL. The PSC devices based on the optimized SEAC achieve an improved power conversion efficiency of 21.29% with negligible J−V hysteresis due to significantly enhanced electron transport and reduced contact charge recombination at the ETL/perovskite interface. In general, this paper comes up with a unique strategy to improve the quality of the SnO 2 -based ETL.

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“…The mixture was heated to 300 °C (5 °C min -1 ) and maintained at 300 °C for 1 h under a flow of nitrogen (50 mL min -1 ). The mixture was then naturally cooled to 130 °C before quenching the system by adding deionized water to the mixture to facilitate the preservation of the Nafunctionalized surface [26]. All the sorbents were washed several times with deionized water to remove unreacted NaOH and impurities.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of functionalized porous montmorillonite via solid-state NaOH treatment for efficient removal of cesium and strontium ions

Kim

et al. 2018

Applied Surface Science

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractSolid-state NaOH treatment of montmorillonite clay was used to enhance the removal of Cs + and Sr 2+ . Through this facile and low-cost modification, montmorillonite with a large BET surface area (117.1 m 2 g -1 ) and many surface functional groups (Si-O-Na), demonstrated enhanced sorption kinetics (89% removal for 40 mg L -1 Cs + and 23 mg L -1 Sr 2+ in 1 h) with a sorption capacity of 290.7 mg g -1 for Cs + and 184.8 mg g -1 for Sr 2+ , greatly exceeding the low sorption capacity (137.0 mg g -1 for Cs + and 15.6 mg g -1 for Sr 2+ ) of pristine montmorillonite.SEM-EDS and XPS analyses revealed that Cs + and Sr 2+ were ion-exchanged with Na + on the surface functional groups formed following NaOH treatment. The performance of NaOHtreated montmorillonite was stable following gamma-ray irradiation (at 6 Gy h -1 for 30 min) and across a broad range of pHs (3 to 11), exhibiting a high distribution coefficient (K d ) of 1.5 × 10 3 mL g -1 for Cs + (1.58 mg L -1 ) and 3.7 × 10 3 mL g -1 for Sr 2+ (1.64 mg L -1 ) under groundwater conditions where various cations including Na + , K + , and Ca 2+ (V/m = 1 L/g) were present. The proposed method demonstrated great improvement of the sorption capacity of an abundant and inexpensive montmorillonite.

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Study of quench effect on heavy metal uptake efficiency by an aluminosilicate-based material

Cited by 20 publications

References 61 publications

Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

Tailoring the Energy Band Structure and Interfacial Morphology of the ETL via Controllable Nanocluster Size Achieves High-Performance Planar Perovskite Solar Cells

Synthesis of functionalized porous montmorillonite via solid-state NaOH treatment for efficient removal of cesium and strontium ions

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