Layered double hydroxides/biochar composites as adsorbents for water remediation applications: recent trends and perspectives

Santos, Grazielle Emanuella de Souza dos; Lins, Pollyanna Vanessa dos Santos; Oliveira, L. M. T. M.; Silva, Elenara Oliveira da; Anastopoulos, Ioannis; Erto, Alessandro; Giannakoudakis, Dimitrios A.; Almeida, André Ricardo Felkl de; Duarte, José Leandro da Silva; Meili, Lucas

doi:10.1016/j.jclepro.2020.124755

Cited by 92 publications

(22 citation statements)

References 84 publications

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“…Most of these works highlight the different synthesis methods, the influence of methods, and synthesis parameters in the formation and structure of LDH. The synthesis parameters evaluated in these studies for the coprecipitation method are pH of synthesis, the base solution’s concentration, the nature of the base solution, the aging time and temperature, and the M 2+ /M 3+ molar ratios. − Almost among all reported applications, LDHs and their derivatives are used as a powder. However, the drying parameter has been neglected.…”

Section: Introductionmentioning

confidence: 99%

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

et al. 2021

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This study aimed to evaluate the synthesis of MgAl/LDH from the drying process perspective, evaluating the influence of temperature (75–90 °C) and time (16–20 h) in the drying process. The synthesis was performed, maintaining a ratio of 2:1 of Mg/Al, and the drying was conducted according to a 2 2 experimental design: four axial points and three repetitions at the central point. The surface area and pore diameter ranged from 4.09 to 18.55 m 2 /g and 12.50 to 24.46 nm. Fourier transform infrared (FTIR) analysis indicated the drying-caused variation of the LDH typical bands intensities. Scanning electron microscopy (SEM) images showed the tendency of the increase of agglomeration with the temperature elevation. The drying parameters’ influence was evident for X-ray diffraction (XRD) analysis observing the crystallite size increment, from 13.10 to 38.94 nm, and basal spacing variation, from 7.52 to 7.64 Å. The statistical models for growing crystal and reduction of the basal spacing were physically consistent but with low values of R 2 . The drying time and temperature had a considerable influence on the chemical, physical, structural, and morphological properties of LDH.

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Section: Introductionmentioning

confidence: 99%

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

et al. 2021

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“…Braghiroli et al [67] showed that biochar high aromaticity and porosity are essential for the sorption of organic contaminants, while the presence of oxygencontaining functional groups and optimum pH are crucial for the sorption of inorganic contaminants, especially metals. Thus, biochar can be proficiently adopted for metals adsorption from polluted water [68], showing to be a promising option for the treatment of contaminants in water, but further research is required to evaluate its performance with real effluents containing contaminants of emerging concern [67].…”

Section: Heavy Metalsmentioning

confidence: 99%

Effects of Biochar in Soil and Water Remediation: A Review

Perdigão¹,

Pereira²

2022

Biodegradation Technology of Organic and Inorganic Pollutants

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In the last decades increased global environmental concerns to water and soils pollution. The main concerns are related to the contamination of the ecosystem, food security, and human health since many of the contaminants present in soil and water (residues of pesticides and antibiotics, genes of resistance to antibiotics, and heavy metals) are absorbed by plants and enter the food chain. Remediation of the contaminated water and soil to ensure sustainable water supply and food production is urgently needed. The use of biochar can have a positive effect on this remediation process. There are several studies that demonstrate the biochar’s ability to block/reduce the contaminating effect of pesticides, antibiotic residues, antibiotic resistance genes, and heavy metals. The objective of this chapter is to carry out a comprehensive review of the effect of using biochar on the availability/transmission of these contaminants to the soil and food supply chain.

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“…These materials can be prepared by several methodologies other than coprecipitation. An alternative is the hydrothermal method, which permits obtaining high particle size and high product purity [3,4]. This method is similar to the co-precipitation, meantime, after stirring the suspension is transferred to a Teflon autoclave for hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

“…This method is similar to the co-precipitation, meantime, after stirring the suspension is transferred to a Teflon autoclave for hydrothermal treatment. The temperature and aging time influences directly in the crystallinity and morphology uniformity of the material [3][4][5][6][7][8]. Urea hydrolysis is a satisfactory example of hydrothermal synthesis in which urea is used as a source of carbonates and hydroxyls anions, providing better crystallinity due to very slow precipitation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy for Characterization of Hydrotalcite-like Materials Used in Catalytic Reactions

Chagas¹,

Chiaro²,

Leitão³

et al. 2022

Recent Developments in Atomic Force Microscopy and Raman Spectroscopy for Materials Characterization

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This chapter covers a brief review of the definition, structural characteristics and main applications of hydrotalcite, an interesting multifunctional material which finds applicability in different areas. Particularly, some catalytic reactions using hydrotalcite or mixed oxides derived from these materials are addressed (Ethanol Steam Reforming, Photochemical conversions, Hydrodesulfurization). The use of Raman Spectroscopy associated with other techniques, such as powder X-ray diffraction (XRD), Extended X-ray Absorption Fine-Structure (EXAFS), Temperature Programmed Reduction of hydrogen (H2-TPR), Fourier-Transform Infrared (FTIR) and Density Functional Theory (DFT) simulations, to characterize this type of material is addressed through examples described in the current literature. In this sense, multidisciplinary efforts must be made in order to increase the understanding of the properties of these materials and the catalytic behavior in the most varied reactions.

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Layered double hydroxides/biochar composites as adsorbents for water remediation applications: recent trends and perspectives

Cited by 92 publications

References 84 publications

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Effect of Drying on the Fabrication of MgAl Layered Double Hydroxides

Effects of Biochar in Soil and Water Remediation: A Review

Raman Spectroscopy for Characterization of Hydrotalcite-like Materials Used in Catalytic Reactions

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