Arsenic (V) removal from water using hydrotalcites as adsorbents: A critical review

Dias, Adriana Cristina; Fontes, Maurício Paulo Ferreira

doi:10.1016/j.clay.2020.105615

Cited by 52 publications

(24 citation statements)

References 157 publications

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“…Moreover, the need for decontamination of rivers and fountains is increasing, due to pollution caused by industrial and human waste. In this sense, LDHs have been extensively researched for use in water purification [28][29][30]. Its anion exchange property associated with high surface area, compositional versatility, and higher adsorption capacity are characteristics that differentiate them from other mineral adsorbents such as aluminum or iron oxy-hydroxides [28].…”

Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

“…In this sense, LDHs have been extensively researched for use in water purification [28][29][30]. Its anion exchange property associated with high surface area, compositional versatility, and higher adsorption capacity are characteristics that differentiate them from other mineral adsorbents such as aluminum or iron oxy-hydroxides [28]. Nevertheless, scientists in this field agree that more knowledge is needed to be able to apply these materials on a large scale [28][29][30][31].…”

Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

“…Its anion exchange property associated with high surface area, compositional versatility, and higher adsorption capacity are characteristics that differentiate them from other mineral adsorbents such as aluminum or iron oxy-hydroxides [28]. Nevertheless, scientists in this field agree that more knowledge is needed to be able to apply these materials on a large scale [28][29][30][31]. Techniques of preparation, functionalization and thermal activation must Raman Spectroscopy for Characterization of Hydrotalcite-like Materials Used in Catalytic… DOI: http://dx.doi.org/10.5772/intechopen.99539 be improved aiming to increase the understanding of their behavior on an atomic scale.…”

Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

Section: Applications Of Hydrotalcite-like Materialsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Figure 1 shows the laminar structure of a hydrotalcite Mg/Al with carbonate ions and water molecules in the interlaminar space. Due to its anion exchange capacity in the interlaminar space, hydrotalcites have been used to remove from water mono-, di-, and polyvalent anions, organochlorine compounds [30,31], heavy metals [32,33], and synthetic dyes [5,[34][35][36]. In addition, the chemical composition of hydrotalcites, as well as their physicochemical properties, have allowed their application in various areas such as catalysis [37], electrocatalysis [38,39], energy storage [40,41], and photocatalysis [5,29,31].…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic Degradation of Congo Red Dye with Activated Hydrotalcites and Copper Anode

et al. 2021

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Photoelectrocatalysis is a novel technique that combines heterogeneous photocatalysis with the application of an electric field to the system through electrodes for the degradation of organic contaminants in aqueous systems, mainly of toxic dyes. The efficiency of these combined processes depends on the semiconductor properties of the catalysts, as well as on the anodic capacity of the electrode. In this study, we propose the use of active hydrotalcites in the degradation of Congo red dye through processes assisted by ultraviolet (UV) irradiation and electric current. Our research focused on evaluating the degradation capacity of Congo red by means of photolysis, catalysis, photocatalysis, electrocatalysis, and photoelectrocatalysis, as well as identifying the effect of the properties of the active hydrotalcites in these processes. The results show that a maximum degradation was reached with the photoelectrocatalysis process with active hydrotalcites and a copper anode at 6 h with 95% in a half-life of 0.36 h. The degradation is favored by the attack of the OH• radicals under double bonds in the diazo groups where the electrode produces Cu2+ ions, and with the photogenerated electrons, the recombination speed of the electron–hole in the hydrotalcite catalyst is reduced until the complete degradation.

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“…Recently, various methods to remove Arsenic out of wastewater have been studied, such as coagulationprecipitation, physical separation, filtration, reverse osmosis , adsorption, ion exchange, and other techniques [7]. Surface adsorption and anion exchange predominate as effective physicochemical processes for harmful oxyanions removal, such as Arsenic, from wastewater even low concentrations [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Palm Oil Fuel Ash (POFA) as an Innovative Material for Arsenic Removal from Mining Effluent

Rainiyati¹,

Riduan²,

Heraningsih³

2021

Proceedings of the 3rd Green Development International Conference (GDIC 2020)

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Arsenic is toxic element, accumulate in the environment as main contaminant in aqueous waste stream. This study aimed to analyze the capability of raw palm oil fuel ash (pofa) as a potential adsorbent to remove arsenic contamination in the wastewater of mining effluent. Technology applied in this study was adsorption followed by precipitation. The maximum arsenic removal percentage of 100 % and a maximum adsorption capacity up to 0.224 mg/g was discovered.The results indicate that the method for arsenic removal from wastewater using raw pofa was effective, simple and lowcost to apply.

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Arsenic (V) removal from water using hydrotalcites as adsorbents: A critical review

Cited by 52 publications

References 157 publications

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

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

Photoelectrocatalytic Degradation of Congo Red Dye with Activated Hydrotalcites and Copper Anode

Palm Oil Fuel Ash (POFA) as an Innovative Material for Arsenic Removal from Mining Effluent

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