Layer double hydroxides (LDHs)- based electrochemical and optical sensing assessments for quantification and identification of heavy metals in water and environment samples: A review of status and prospects

Sohrabi, Hessamaddin; Khataee, Alireza; Ghasemzadeh, Shahin; Majidi, Mir Reza; Orooji, Yasin

doi:10.1016/j.teac.2021.e00139

Cited by 59 publications

(24 citation statements)

References 51 publications

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“…It can be used directly without the need for binding or conductive materials. The electrode fabrication is simple and requires no tedious efforts [55]. In addition, the presence of cellulose functional groups (-OH and -COOH) in CelloZIFPaper enhances the metal adsorption making it a good candidate for the electrochemical sensing of, for instance, Pb 2+ (Table 3).…”

Section: Electrochemical-based Sensing Of Heavy Metal Ionsmentioning

confidence: 99%

“…In this context, methodologies to remove as well as sense/detect these ions are highly required to advance the water treatment. To that end, MOFs, among several other materials, offer the possibility for heavy metal removal via adsorption [26] as well as the detection of such contaminants using imaging-assisted sensing [54] and electrochemical and optical sensing [55].…”

Section: Introductionmentioning

confidence: 99%

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CelloZIFPaper: Cellulose-ZIF Hybrid Paper for Heavy Metal Removal and Electrochemical Sensing

Abdelhamid

Georgouvelas

Edlund

et al. 2022

Preprint

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The processing of hierarchical porous zeolitic imidazolate frameworks (ZIF-8) into a cellulose paper using sheet former Rapid-Köthen (R.K.) is reported. The procedure is a promising route to overcome a significant bottleneck towards applying metal-organic frameworks (MOFs) in commercial products. ZIF-8 crystals were integrated into cellulose pulp (CP) or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-oxidized cellulose nanofibrils (TOCNF) following an in-situ or ex-situ process; the materials were denoted as CelloZIFPaper_In Situ and CelloZIFPaper_Ex Situ. The materials were applied as adsorbents to remove heavy metals from water, with adsorption capacities of 66.2 - 354.0 mg/g. CelloZIFPaper can also be used as a stand-alone working electrode for the selective sensing of toxic heavy metals, for instance, lead ions (Pb2+), using electrochemical-based methods with a detection limit of 8 µM. The electrochemical measurements may advance 'Lab-on-CelloZIFPaper' technologies for label-free detection of Pb2+ ions.

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Section: Electrochemical-based Sensing Of Heavy Metal Ionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CelloZIFPaper: Cellulose-ZIF Hybrid Paper for Heavy Metal Removal and Electrochemical Sensing

Abdelhamid

Georgouvelas

Edlund

et al. 2022

Preprint

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“…bromide, chloride, uoride, and iodide), organic dyes, pharmaceuticals and personal care products (or their metabolites), among others. [10][11][12][13][14][15][16][17][18] Signicant features such as resistance to thermal changes and pH variations, high surface area, and great anion-exchange treatments, 14 along with versatility, inertness, biocompatibility, low cost, and nontoxic properties make these nanomaterials an eco-friendly option with the potential capacity to adsorb/ remove/trap a wide variety of compounds.…”

Section: Introductionmentioning

confidence: 99%

“…bromide, chloride, fluoride, and iodide), organic dyes, pharmaceuticals and personal care products (or their metabolites), among others. 10–18…”

Section: Introductionmentioning

confidence: 99%

Synthesis and evaluation of a Zn–Al layered double hydroxide for the removal of ochratoxin A. Greenness assessment

et al. 2022

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“…Moreover, there is currently an increasing interest in LDHs due to their properties as heterogeneous catalysts and supports for molecular catalysts [29][30][31] or photocatalysis [32], for fabrication of superhydrophobic surfaces [33,34], water treatment and remediation [35][36][37] and ion-exchanger membranes [38,39]. Interestingly, anion conductivity in LDHs can be modulated by incorporating different anions in the interlayer space, allowing for their use as sensors [40][41][42][43][44] or as fillers in different electrochemical applications, such as fuel cells, supercapacitors and water splitting [45][46][47]. Different types of LDH compounds and LDH-based nanocomposites and hybrids have been made available by several synthesis methods, including exfoliation or topdown methods, as well as several chemical or mechanical methods (see, for instance, [48,49]).…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides as a Drug Delivery Vehicle for S-Allyl-Mercapto-Cysteine (SAMC)

et al. 2021

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The intercalations of anionic molecules and drugs in layered double hydroxides (LDHs) have been intensively investigated in recent years. Due to their properties, such as versatility in chemical composition, good biocompatibility, high density and protection of loaded drugs, LDHs seem very promising nanosized systems for drug delivery. In this work, we report the intercalation of S-allyl-mercapto-cysteine (SAMC), which is a component of garlic that is well-known for its anti-tumor properties, inside ZnAl-LDH (hereafter LDH) nanostructured crystals. In order to investigate the efficacy of the intercalation and drug delivery of SAMC, the intercalated compounds were characterized using X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The increase in the interlayer distance of LDH from 8.9 Å, typical of the nitrate phase, to 13.9 Å indicated the intercalation of SAMC, which was also confirmed using FT-IR spectra. Indeed, compared to that of the pristine LDH precursor, the spectrum of LDH-SAMC was richly structured in the fingerprint region below 1300 cm−1, whose peaks corresponded to those of the functional groups in the SAMC molecular anion. The LDH-SAMC empirical formula, obtained from UV-Vis spectrophotometry and thermogravimetric analysis, was [Zn0.67Al0.33(OH)2]SAMC0.15(NO3)0.18·0.6H2O. The morphology of the sample was investigated using SEM: LDH-SAMC exhibited a more irregular size and shape of the flake-like crystals in comparison with the pristine LDH, with a reduction in the average crystallite size from 3 µm to about 2 µm. In vitro drug release studies were performed in a phosphate buffer solution at pH 7.2 and 37 °C and were analyzed using UV-Vis spectrophotometry. The SAMC release from LDH-SAMC was initially characterized by a burst effect in the first four hours, during which, 32% of the SAMC is released. Subsequently, the release percentage increased at a slower rate until 42% after 48 h; then it stabilized at 43% and remained constant for the remaining period of the investigation. The LDH-SAMC complex that was developed in this study showed the improved efficacy of the action of SAMC in reducing the invasive capacity of a human hepatoma cell line.

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Layer double hydroxides (LDHs)- based electrochemical and optical sensing assessments for quantification and identification of heavy metals in water and environment samples: A review of status and prospects

Cited by 59 publications

References 51 publications

CelloZIFPaper: Cellulose-ZIF Hybrid Paper for Heavy Metal Removal and Electrochemical Sensing

CelloZIFPaper: Cellulose-ZIF Hybrid Paper for Heavy Metal Removal and Electrochemical Sensing

Synthesis and evaluation of a Zn–Al layered double hydroxide for the removal of ochratoxin A. Greenness assessment

Layered Double Hydroxides as a Drug Delivery Vehicle for S-Allyl-Mercapto-Cysteine (SAMC)

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