Nanostructured modified layered double hydroxides (LDHs)-based catalysts: A review on synthesis, characterization, and applications in water remediation by advanced oxidation processes

Karim, Ansaf V.; Hassani, Aydin; Eghbali, Paria; Nidheesh, P.V.

doi:10.1016/j.cossms.2021.100965

Cited by 212 publications

(55 citation statements)

References 316 publications

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“…LDHs are well-known for their anionic exchange capacity (AEC) in interlamellar space [13][14][15], which varies between 2 and 5 meq•g −1 [16,17]. For these reasons, LDHs have attracted significant interest for industrial and environmental applications [7,[18][19][20][21][22][23]. Moreover, LDHs were recently demonstrated as being among the most promising materials for the photoelectrochemical reduction of CO 2 , due to their capacity to facilitate the elaboration of sophisticated catalysts, among other things [24].…”

Section: Introductionmentioning

confidence: 99%

Comprehension of the Route for the Synthesis of Co/Fe LDHs via the Method of Coprecipitation with Varying pH

et al. 2022

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Co/Fe-based layered double hydroxides (LDHs) are among the most promising materials for electrochemical applications, particularly in the development of energy storage devices, such as electrochemical capacitors. They have also been demonstrated to function as energy conversion catalysts in photoelectrochemical applications for CO2 conversion into valuable chemicals. Understanding the formation mechanisms of such compounds is therefore of prime interest for further controlling the chemical composition, structure, morphology, and/or reactivity of synthesized materials. In this study, a combination of X-ray diffraction, vibrational and absorption spectroscopies, as well as physical and chemical analyses were used to provide deep insight into the coprecipitation formation mechanisms of Co/Fe-based LDHs under high supersaturation conditions. This procedure consists of adding an alkaline aqueous solution (2.80 M NaOH and 0.78 M Na2CO3) into a cationic solution (0.15 M CoII and 0.05 M FeIII) and varying the pH until the desired pH value is reached. Beginning at pH 2, pH increases induce precipitation of FeIII as ferrihydrite, which is the pristine reactional intermediate. From pH > 2, CoII sorption on ferrihydrite promotes a redox reaction between FeIII of ferrihydrite and the sorbed CoII. The crystallinity of the poorly crystalized ferrihydrite progressively decreases with increasing pH. The combination of such a phenomenon with the hydrolysis of both the sorbed CoIII and free CoII generates pristine hydroxylated FeII/CoIII LDHs at pH 7. Above pH 7, free CoII hydrolysis proceeds, which is responsible for the local dissolution of pristine LDHs and their reprecipitation and then 3D organization into CoII4FeII2CoIII2 LDHs. The progressive incorporation of CoII into the LDH structure is accountable for two phenomena: decreased coulombic attraction between the positive surface-charge sites and the interlayer anions and, concomitantly, the relative redox potential evolution of the redox species, such as when FeII is re-oxidized to FeIII, while CoIII is re-reduced to CoII, returning to a CoII6FeIII2 LDH. The nature of the interlamellar species (OH−, HCO3−, CO32− and NO3−) depends on their mobility and the speciation of anions in response to changing pH.

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Section: Introductionmentioning

confidence: 99%

Comprehension of the Route for the Synthesis of Co/Fe LDHs via the Method of Coprecipitation with Varying pH

et al. 2022

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“…Their layered structure, high adsorption capacity, comprehensive chemical composition, variable layer charge density, ion-exchange properties, reactive interlayer space, tunable acidity-basicity surface, and environment-friendly property make it a promising material for various applications (Forano et al 2013). Besides, LDHs are prospective candidate catalysts for water treatment owing to their excellent structural and physicochemical properties interacting with pollutants in aqueous solutions (Karim et al 2022). The catalytic activity and further application of LDHs are limited owing to the lack of functional groups and structural components in pure LDHs.…”

Section: Introductionmentioning

confidence: 99%

Highly effectual photocatalytic degradation of tartrazine by using Ag nanoparticles decorated on Zn-Cu-Cr layered double hydroxide@ 2D graphitic carbon nitride (C3N5)

Akbarzadeh¹,

Khazani

Khaloo

et al. 2022

Environ Sci Pollut Res

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Pollution of water resources is one of the main concerns of many countries. This issue originates from the entry of diverse pollutants, including dye compounds, into water sources. In this work, ternary Zn-Cu-Cr layered double hydroxides (LDH) supported on graphitic carbon nitride (g-C 3 N 5 ) decorated by silver nanoparticles (C 3 N 5 -LDH-Ag) was rst prepared. Application of various characterization techniques such as SEM, XRD, and FT-IR revealed that the synthesized nanocomposite was composed of Zn-Cu-Cr LDH nanoparticles, g-C 3 N 4 nanosheets, and Ag nanoparticles. The prepared nanomaterials were employed for the photodegradation of tartrazine in aqueous solutions. It was found that the C 3 N 5 -LDH-Ag catalyst outperformed their pure g-C 3 N 5 , Zn-Cu-Cr LDH, and C 3 N 5 -LDH composite in photocatalytic degradation of tartrazine under visible light irradiation. Tartrazine (20 mg/L) can be entirely removed by 0.25 g/L C 3 N 5 -LDH-Ag photocatalyst under one h visible light irradiation (200W) at pH 6 with a rapid degradation rate constant (k) that is 4.4, 3.9, and 2.6 times higher than that of pure C 3 N 5 , Zn-Cu-Cr LDH, and C 3 N 5 -LDH component, respectively. The formation of hydroxyl radicals on the surface of C 3 N 5 -LDH-Ag as the main active species was approved by the capturing experiment. The nding results approved the stability and reusability of C 3 N 5 -LDH-Ag in four photocatalytic degradation cycles. In general, our ndings revealed that the synthesized nanocomposite could be employed as an e cient photocatalyst in environmental remediation.

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“…LDH is derived from the mineral clay brucite, whose general formula is Mg(OH) 2 . In the catalytic process, LDH has been used for water remediation (Karim et al, 2022) , n-heptane hydroconversion (Zhu et al, 2019) , and biodiesel production (Gabriel et al, 2021) . LDH is interested in catalysis due to its large surface area and homogeneous distribution of various essential components (Zhu et al, 2019) .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidative Desulfurization of Dibenzothiophene by Composites Based Ni/Al-Oxide

Ahmad

Wijaya

Amri

et al. 2022

Sci. Technol. Indones

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In the present study, composite layer double hydroxide-metal oxide (Ni/Al-TiO2 and Ni/Al-ZnO) was successfully prepared and used as catalyst of oxidative desulfurization of dibenzothiophene. Characterization of catalyst was used XRD, FTIR, and SEM-EDS. The structure of Ni/Al-LDH, TiO2, and ZnO in composite Ni/Al-TiO2 and Ni/Al-ZnO was consistent, which also indicated that the preparation of composite did not change the form of precursors. FTIR spectra of Ni/Al-TiO2 and Ni/Al-ZnO absorption band at 3398, 1639, 1339, 832, 731, and 682 cm−1. The catalysts have an irregular structure, TiO2 and ZnO adhere to the surface of Ni/Al LDH. The percent mass of Ti and Zn on the composite at 29.3% and 18.2%, respectively. The acidity of Ni/Al LDH increased after being composited with TiO2 and ZnO. The optimum reaction time, dosage catalyst, and temperature were 30 min, 0.25 g, and 50°C, respectively, and n-hexane as a solvent. The percentage conversion of dibenzothiophene on Ni/Al-LDH, TiO2, ZnO, Ni/Al-TiO2, and Ni/Al-ZnO were 99.44%, 91.92%, 95.36%, 99.88%, and 99.90%, respectively. The catalysts are heterogeneous system and the advantage is that can be used for reusability. After 3 times catalytic reactions, the conversion of dibenzothiophene still retains more than 80%, even Ni/Al-TiO2 and Ni/Al-ZnO composites still 97.79% and 98.99%, respectively.

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Nanostructured modified layered double hydroxides (LDHs)-based catalysts: A review on synthesis, characterization, and applications in water remediation by advanced oxidation processes

Cited by 212 publications

References 316 publications

Comprehension of the Route for the Synthesis of Co/Fe LDHs via the Method of Coprecipitation with Varying pH

Comprehension of the Route for the Synthesis of Co/Fe LDHs via the Method of Coprecipitation with Varying pH

Highly effectual photocatalytic degradation of tartrazine by using Ag nanoparticles decorated on Zn-Cu-Cr layered double hydroxide@ 2D graphitic carbon nitride (C3N5)

Catalytic Oxidative Desulfurization of Dibenzothiophene by Composites Based Ni/Al-Oxide

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