Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Li, Yang; Shahrivari, Zoya; Liu, Paul K. T.; Sahimi, Muhammad; Tsotsis, Theodore T.

doi:10.1021/ie049060u

Cited by 267 publications

(233 citation statements)

References 34 publications

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“…Uncalcined carbonate-LDHs adsorbs more than 85% of As(III) and Cr(VI) [88,89]. The desorption of As(V) and Se(IV) was dependent on the anion species and their concentrations in the desorbing solutions [90].…”

Section: Heave Metal Capture In Liquid Wastementioning

confidence: 99%

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Richetta¹

2017

J Material Sci Eng

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The peculiar properties of layered Double Hydroxides (LDH) have progressively drawn the attention of the scientific community. The main characteristic of LDH is the ability to capture anionic species (organic and inorganic) to build different composites. This is made possible by the sandwich structure of the LDH, similar to the brucite architecture, made up of positive charged lamellas interspersed by anions. Several distant fields, ranging from medicine to physics and engineering, exhibit interest in LDH applications. To satisfy all those requirements, energy was spent to sculpt LDHs physical and chemical properties and for designing layered double hydroxides "ad hoc" for different needs and employments. Notably, among the many applications, those related to metallurgical processes and products are of particular interest. This paper presents the characteristics, the main preparation routes and reviews the applications of LDH to metallurgy with some examples taken from the experimental research of the author.

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Section: Heave Metal Capture In Liquid Wastementioning

confidence: 99%

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Richetta¹

2017

J Material Sci Eng

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“…Among the possible materials, transition metal oxides were studied extensively, such as MnO 2 , Co 3 O 4 , ZnO, and so on [9][10][11][12][13][14][15][16][17][18]. Layered double hydroxide (LDH) as a kind of heterostructure nanomaterials have shown superior properties in applications such as catalysis, sorption, medicine, and so on [19][20][21]. However, layered double hydroxide (LDH), as potential electrochemical active materials, its electrochemical properties is less studied.…”

Section: Introductionmentioning

confidence: 99%

Preparation and capacitance properties of graphene/NiAl layered double-hydroxide nanocomposite

Wang

Zhang

Wang

et al. 2013

Journal of Colloid and Interface Science

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a b s t r a c tGraphene/NiAl layered double-hydroxide (LDH) composite with high capacitive properties has been prepared in a friendly one-step process. It is found that NiAl-LDH is formed in the addition of precipitator agent (NaOH and NaNO 3 ) by hydrothermal method, at the same time graphene oxide (GO) is reduced to graphene. The morphology and structure of the obtained material are examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), and scanning electron microscope (SEM) techniques. It is revealed that the NiAl-LDH disperses well on the surface of graphene and the formation of NiAl-LDH nanoparticles is beneficial to the peeling of graphene (RGO). More importantly, the addition of NiAl-LDH to graphene endows the materials with desirable specific surface areas and higher porosity. These structural advantages result in higher specific capacitance compared with pristine graphene. Electrochemical property investigations show that the graphene/NiAl-LDH had a higher specific capacitance than graphene.Crown

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“…Previous studies reported similar trends whereby the adsorption of As(III) on hydrotalcite was found to be consistent with the Langmuir model. 11,37) Moreover, the value of W s increased with increasing temperature. These results are in agreement with the present experimental data.…”

Section: )mentioning

confidence: 93%

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

Ogata

Kawasaki

2015

CHEMICAL & PHARMACEUTICAL BULLETIN

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Morphological and chemical evaluation of Fe-Mg hydrotalcite (Fe-HT) was performed using scanning electron microscopy, X-ray diffraction analysis, and electron microanalysis for application as an adsorbent for water treatment. The adsorption of arsenic III (As(III)) on Fe-HT was evaluated via examination of the effect of the contact time and analysis of the adsorption isotherm. The amount of As(III) adsorbed increased slightly with increasing temperature. The results of the adsorption isotherm studies suggested that As(III) adsorption can be well described by both the Freundlich and Langmuir equations. The adsorption of As(III) on Fe-HT reached equilibrium within 24 h, and the adsorption kinetic data fit the pseudo-second-order kinetic model better than the pseudo-first-order model. The amount of As(III) present on the surface of Fe-HT increased after As(III) adsorption, and the crystalline structure of Fe-HT was maintained after adsorption of As(III). The (003) and (006) peaks in the X-ray diffraction patterns were attributed to basal reflections, and these peaks shifted from respective 2θ values of 10.86 and 21.94° to 11.12 and 22.52°, indicating exchange of As(III) with chloride ions in Fe-HT with consequent narrowing of the inter-layer spacing. Collectively, these results suggest that Fe-HT is prospectively useful for the adsorption of As(III) from aqueous solutions. Key words Fe-Mg hydrotalcite; arsenic(III); adsorptionHeavy metals are potentially hazardous to human health and aquatic flora and fauna at concentrations exceeding the allowable limits. At concentrations below these limits, long-term heavy metal contamination is still possible because heavy metals are known to accumulate within biological systems. 1)Arsenic (As) is one of the most toxic metal ions and poses a serious health risk in many countries of the world, being associated with increased risk of skin, lung, and kidney cancer.2,3) The presence of As in groundwater in different parts of the world has recently been extensively reported, including countries in North America and Latin America, Australia, and South Asia. [4][5][6][7][8][9][10] Therefore, the Environmental Protection Agency (EPA) lowered the maximum concentration level of arsenic in water systems from 50 to 10 µg/L. In addition, As(III) is more toxic and difficult to treat than As(V) species. As(III) and As(V) are highly toxic agents that exert mutagenic effects on living organisms.11-13) Compliance with this strict As standard in drinking water requires the development of inexpensive and effective technologies for better removal of As.Among these methods, the adsorption technique is gaining popularity due to its simplicity, potential for regeneration, and sludge-free operation.14) Furthermore, the potential of adsorption as an attractive technology can be further enhanced if the adsorbent can be made cheaply and ready for use. Many kinds of adsorbents such as modified red mud, aluminum compounds, and synthetic goethite have been developed for the removal arsenic. [15][16][17][18] ...

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Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Cited by 267 publications

References 34 publications

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Characteristics, Preparation Routes and Metallurgical Applications of LDHs: An Overview

Preparation and capacitance properties of graphene/NiAl layered double-hydroxide nanocomposite

Adsorption of As(III) from Aqueous Solutions by Novel Fe–Mg Type Hydrotalcite

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