Uptake of arsenite and arsenate by clinoptilolite-rich tuffs

Elizalde-González, Marı́a P.; Mattusch, Jürgen; Wennrich, Rainer; Morgenstern, Peter

doi:10.1016/s1387-1811(01)00308-0

Cited by 94 publications

(42 citation statements)

References 22 publications

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“…Coagulation and softening with metal ions such as aluminum and ferric salts require use of large-scale facilities for implementing water treatment. Adsorbent materials studied for arsenic removal include activated alumina, fly ash, pyrite fines, manganese greensand [3], amino-functionalized meso porous silicas [4], aluminum loaded Shirasu-zeolite [5], clinoptilolite, and other zeolites [6][7][8]. However, there is still a strong challenge in developing economical and commonly available biosorbents for As removal.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Studies for Arsenic Removal Using ActivatedMoringa oleifera

Sumathi¹,

Alagumuthu²

2014

International Journal of Chemical Engineering

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A new low cost adsorbent, activated Moringa oleifera has been developed for aqueous arsenic removal. Batch experiments were revealed that As removal was up to 71.3% using activated Moringa oleifera. Kinetics studies revealed that Langmuir isotherm was followed with a better correlation than the Freundlich isotherm. The thermodynamic parameters such as ΔH, ΔS, and ΔG were computed from the experimental data. These values show that the adsorption is endothermic and spontaneous in nature. Thus, this recently developed cost-effective novel biosorbent, activated Moringa oleifera can be used as household level to mitigate the arsenic problem.

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Section: Introductionmentioning

confidence: 99%

Adsorption Studies for Arsenic Removal Using ActivatedMoringa oleifera

Sumathi¹,

Alagumuthu²

2014

International Journal of Chemical Engineering

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“…In the region 600-800 cm -1 (590 and 720 cm -1 ), bands attributed to exchangeable cations may occur, but bands due to pseudocrystallic vibrations may be confusing [32,33] These bands are clearly lower intensity in the FTIR spectra of 360 and 480 min samples -as compared to feed sample -as these samples could suffer crystallinity loss. These vibrations are insensitive to the nature of the channel cations, as well as to the Si/Al ratio.…”

Section: Ftirmentioning

confidence: 99%

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Bohács¹,

Faitli²,

Bokányi³

et al. 2017

Archives of Metallurgy and Materials

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Due to the special characteristics of zeolites, they can be applied in a very wide range of industries, i.e. agricultural, environmental or water treatment purposes. Generally, high added value zeolite products are manufactured by micro-or nanogrinding. However, these processes require high energy input and cause significant wearing of the mill parts. Therefore, the optimization of zeolite grinding, as well as the control of its properties are of a great importance. In the present paper a Hungarian natural zeolite was mechanically activated in stirred media mill for various residence times in distilled water, meanwhile the particle size distribution and the grinding energy were measured. Additionally, on-line tube rheometer was used to study the rheology of the suspension during the grinding process. The particle interaction and the suspension aggregation stability were detected by zeta-potential measurements. Structural changes due to the mechanical activation process were monitored by FTIR. It was found that the material structure of the zeolite, as well as the rheological behaviour of the zeolite suspension and its aggregation stability had been altered due to the mechanical activation in the stirred media mill. It can be concluded that the zeolite product properties can be modified by mechanical activation in order to produce a high added value tailored material.

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“…Being different from Fe-Mn binary oxide [12], the adsorption behavior of FMBO-diatomite was described well by the Langmuir isotherm model, which assumes monolayer adsorption onto a homogeneous surface with a finite number of identical sites [21]. It is suggested that Fe-Mn binary oxide dispersed well on the diatomite as a layer of adsorption sites.…”

Section: Effect Of the Temperature On As(iii) Adsorption Isothermsmentioning

confidence: 99%

Fe–Mn binary oxide incorporated into diatomite as an adsorbent for arsenite removal: Preparation and evaluation

Chang

Liu

et al. 2009

Journal of Colloid and Interface Science

103

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a b s t r a c tFe-Mn binary oxide incorporated into diatomite (FMBO-diatomite) was prepared by a simple coating method, and exhibited high oxidation and adsorption ability for arsenite [As(III)]. After being incorporated by Fe-Mn binary oxide, the surface area of diatomite increased 36%, and the pore volume increased five times. The pH zpc of FMBO-diatomite was determined to be 8.1. These characteristics are responsible for the increased As(III) adsorption efficiency. The adsorption equilibria of As(III) on FMBO-diatomite were described well by a Langmuir isotherm model due to the homogeneous distribution of Fe-Mn binary oxide on a diatomite surface. As(III) was oxidized into As(V), and then adsorbed by FMBO-diatomite. The oxidation and adsorption efficiencies for As(III) depended deeply on the pH of solution. When the pH was raised to 8.1, the As(III) adsorption efficiency of FMBO-diatomite was almost equal to the As(III) oxidation efficiency. Silicate and phosphate had negative effects on As(III) adsorption. Also the influence of silicate and phosphate with the pH variation was different.

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Uptake of arsenite and arsenate by clinoptilolite-rich tuffs

Cited by 94 publications

References 22 publications

Adsorption Studies for Arsenic Removal Using ActivatedMoringa oleifera

Adsorption Studies for Arsenic Removal Using ActivatedMoringa oleifera

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Fe–Mn binary oxide incorporated into diatomite as an adsorbent for arsenite removal: Preparation and evaluation

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