Adsorption of Ba2+ by Ca-exchange clinoptilolite tuff and montmorillonite clay

Chávez, M. Lourdes; Pablo, Liberto de; García, Tonatiuh

doi:10.1016/j.jhazmat.2009.09.151

Cited by 56 publications

(35 citation statements)

References 53 publications

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“…SynAllo-1 revealed a better adsorption for Ba , Zn and Sr than HCoO ions, while SynAllo-2 showed a preferable uptake of Zn over Ba , HCoO and Sr ions and NatAllo displayed a better adsorption for Zn relative to HCoO , Ba and Sr ions. The obtained results likely depend on the individual surface charge properties of the adsorbents (although not confirmed by our data) and in particular on the aqueous speciation of the adsorbate [16,33,35,37]. A similar selectivity of metal ion uptake from solution by allophanes grafted with phosphate was observed by Okada et al [35], which increased in the order Ni ≤ Mg < Co < Ca < Zn < Cu at pH 5.1-6.2.…”

Section: Effect Of Metal Ion Concentration On the Adsorption Efficiencysupporting

confidence: 74%

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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Abstract:The capacity and the mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr) and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium between aqueous metal ions and allophane was reached within < 10 min. The metal ion removal efficiencies varied from 0.7 to 99.7 % at pH 4.0 to 8.5. At equilibrium, the adsorption behavior is better described by the Langmuir model than by the Dubinin-Radushkevich model, yielding sorption capacities of 10.6, 17.2 and 38.6 mg/g for Ba , 12.4, 19.3 and 29.0 mg/g for HCoO , 7.2, 15.9 and 34.4 mg/g for Sr and 20.9, 26.9 and 36.9 mg/g for Zn , respectively, by NatAllo, SynAllo-2 and SynAllo-1. The uptake mechanism is based on a physical adsorption process. Allophane holds great potential to remove aqueous metal ions and could be used instead of zeolites, montmorillonite, carbonates and phosphates for wastewater treatment.

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Section: Effect Of Metal Ion Concentration On the Adsorption Efficiencysupporting

confidence: 74%

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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“…Barium is among the heavy metals widely present in many industrial effluents, and also has many radioactive isotopes, 133 Ba being the most important one [15]. A number of authors [16][17][18] studied the adsorption and immobilization of Ba cations by smectites (mainly by montmorillonite). The pioneering studies [19][20][21][22][23][24][25] of the smectite hydration properties as a function of the relative humidity, based on X-ray diffraction (XRD) patterns, focused essentially on the fluctuations of a 00l basal reflections position.…”

Section: Introductionmentioning

confidence: 99%

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

2015

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The structural changes along the c axis, of the Ba-exchanged montmorillonite (Swy-2-Ba), under variable relative humidity (% RH), is investigated. In this regard, the arrangement, amount and position of both exchangeable cation and the water molecules in the interlamellar space (IS), are evaluated. This aim is achieved using the X-ray diffraction (XRD) profile modeling approach that consists of comparing experimental and theoretical patterns calculated from structural models. The contributions of the hydration states and the interlayer water amounts, as a function of the % RH, are registered by quantitative XRD investigation. The validated structural models are heterogeneous, suggesting various proportions of layer types at different RH ranges, which means the coexistence of different mixed layer structure MLS packages, exhibiting different proportions of layers with contrasting hydration states. This result is attributed to the orientation of the applied hydration sequence. Indeed, the interlayer water molecule amounts, which led to the appearance of a logic hydration hysteresis, are strongly affected by hydrous perturbation.

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“…Therefore, in order to reach high efficiency of the recovery of water, the barium must be removed. The experimental data was obtained from two papers: Chavez et al (2010) and Arafa et al (1974). In the first paper, the adsorption isotherms were determined by contacting 0.2 g of two adsorbents: clinoptilolite tuff and montmorillonite clay with 10 ml of a solution that contained barium chloride (BaCl 2 ) and calcium chloride (CaCl 2 ).…”

Section: Problem Description For Barium Removalmentioning

confidence: 99%

“…1. The constant values of b and K can be found in Chavez et al (2010). On the other hand, the adsorption equilibrium of barium by β-Mn 2 O is taken from the adsorption isotherm presented in the paper by Arafa et al (1974).…”

Section: Problem Description For Barium Removalmentioning

confidence: 99%

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Optimal design of adsorbents for NORM removal from produced water in natural gas fracking. Part 1: Group contribution method for adsorption

Benavides

Diwekar

2015

Chemical Engineering Science

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We applied group contribution methods (GCM) to predict specific properties of adsorbent required. We estimated the thermodynamic properties such as the activity coefficients of adsorbents based on the proposed GCM. We compare the experimental adsorption capacity and the estimated adsorption capacities from the GCM. a b s t r a c t Natural gas has become an essential energy resource in the U.S. due to the increasing demand of energy, the high oil prices, and the need of foreign oil independency. The improvement in the drilling technology has allowed the rapid expansion in gas production, especially for unconventional gas such as shale gas. Shale gas is natural gas trapped within fine-grained sedimentary rocks called shale formations. Hydraulic fracturing is used to extract natural gas from these formations. Although natural gas is cleaner-energy source than coal or oil, there is a lot of controversy due to the environmental impact related to the water consumption and treatment. Hydraulic fracturing generates significant volumes of wastewater that contain dissolved chemicals, high content of salts, and significant levels of natural occurring radioactive material (NORM). Hence, one of the biggest challenges of this industry is to develop techniques for the prevention, remediation, and appropriate disposal of NORM. The overall objective of this work is to develop and implement a novel computational tool for high-throughput screening and selection of new adsorbents for NORM removal. In the first part of this paper series, we study the adsorption theory for NORM removal and applied group contribution methods (GCMs) to predict specific properties of adsorbents based on their thermodynamics. Then, in the second part of this paper we develop a computer-aided molecular design (CAMD) framework that generates potential adsorbent candidates according to the properties developed by the GCMs.

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Adsorption of Ba2+ by Ca-exchange clinoptilolite tuff and montmorillonite clay

Cited by 56 publications

References 53 publications

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Quantitative XRD Analysis of the Structural Changes of Ba-Exchanged Montmorillonite: Effect of an in Situ Hydrous Perturbation

Optimal design of adsorbents for NORM removal from produced water in natural gas fracking. Part 1: Group contribution method for adsorption

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