Removal Characteristics of Cd(II), Cu(II), Pb(II), and Zn(II) by Natural Mongolian Zeolite through Batch and Column Experiments

Batjargal, Tserennyam; Yang, Jung‐Seok; Kim, Do-Hyung; Baek, Kitae

doi:10.1080/01496395.2010.551394

Cited by 21 publications

(7 citation statements)

References 28 publications

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“…These results indicated that the ZIF‐67 integrated composite membrane had a good adsorption capacity, making it suitable for removing heavy metal ions. The performance of this composite membrane was compared with other adsorbents reported in other literatures, as shown in Table 2 , the as‐prepared pearl‐necklace‐like composite membranes showed a competitive adsorption capacity with respect to other adsorbents. Furthermore, the adsorption of other heavy metal ions by sample ZIF/CA‐24 was explored (Figure S4, Supporting Information), and it was noted that the composite membrane also effectively removed other heavy metal ions other than Cu(II) and Cr(VI).…”

Section: Resultsmentioning

confidence: 91%

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

Hou

Zhou

Jin

et al. 2018

Part & Part Syst Charact

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The zeolitic imidazolate framework‐67 (ZIF‐67)‐based “pearl‐necklace‐like” composite membranes are prepared by in situ intergrown on the surface of 2‐methylimidazole/cellulose acetate (MIM/CA) electrospun nanofibers for the first time. With the aid of MIM, the ZIF‐67 nanocrystals successfully grow throughout the composites and attach to the fibers just like the pearls in necklace. The incubation time of ZIF‐67 has a significant influence on the structures and properties of the composites. And with an approximate saturation of ZIF‐67 nanocrystals, the integrated composites achieve a much higher surface area of 463.1 m2 g−1, which is as dozens of times as that of pure MIM/CA electrospun nanofibers (6.9 m2 g−1). In addition, the composites performed a high Cu(II) and Cr(VI) adsorption of 18.9 mg g−1 and 14.5 mg g−1, respectively. The adsorption data are well fitted with the pseudo‐second‐order kinetics. Moreover, adsorption mechanism is also discussed, and the electrostatic adsorption and ions exchange contribute to the high adsorption of Cu(II) and Cr(VI), and the existence of Cr(III) indicates that the Cr(VI) ions are partially reduced to Cr(III) during the adsorption. Therefore, the fabricated metal organic framework‐composite membrane with special “pearl‐necklace‐like” is a promising environmental material for removing heavy metal ions from water.

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Section: Resultsmentioning

confidence: 91%

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

Hou

Zhou

Jin

et al. 2018

Part & Part Syst Charact

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“…transform infrared (FTIR) results revealed that the Ca 2+ ions in this Ca-MOF are capable of being exchanged by Cu 2+ almost quantitatively in seconds in aqueous solution. This MOF showed a maximum Cu 2+ sorption capacity of ≈68 mg g −1 at pH = 7, which is higher than those of activated carbons, [60] natural zeolite, [61] and several organic resins [62] (13-60 mg g −1 ). The second-order rate constant k 2 of Ca-MOF is as high as 0.032 g mg −1 min −1 , obtained by exchange kinetics experiment.…”

Section: Capture Of Metal Ions and Other Moleculesmentioning

confidence: 97%

Calcium‐Based Metal–Organic Frameworks and Their Potential Applications

Xian

Lin

Wang

et al. 2020

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Metal-organic frameworks (MOFs) built on calcium metal (Ca-MOFs) represent a unique subclass of MOFs featuring high stability, low toxicity, and relatively low density. Ca-MOFs show considerable potential for molecular separations, electronic, magnetic, and biomedical applications, although they are not investigated as extensively as transition metal-based MOFs. Compared to MOFs made of other groups of metals, Ca-MOFs may be particularly advantageous for certain applications such as adsorption and storage of light molecules because of their gravimetric benefit, and drug delivery due to their high biocompatibility. This review intends to provide an overview on the recent development of Ca-MOFs, including their synthesis, crystal structures, important properties, and related applications. Various synthetic methods and techniques, types of building blocks, structure and porosity features, selected physical properties, and potential uses will be discussed and summarized. Representative examples will be illustrated for each type of important applications with a focus on their structure-property relations.ethylene/acetylene, propane/propylene) through highly selective size exclusion mechanism, [6,11,24] which has not been achieved by conventional adsorbent materials. The potential uses of MOFs depend on their pore structure (pore size/pore shape), surface functionality, as well as the type of metal centers and ligands.Calcium-based metal-organic frameworks (Ca-MOFs) represent a subgroup of MOFs with calcium as metal centers. Unlike MOFs built on transition and post-transition metals (Zr, Fe, Co, Ni, Cu, Zn, etc.) which tend to form commonly observed SBUs and topology and, therefore allow for successful design and implementation of targeted structure and functionality, the prediction of coordination geometry and structural topology of Ca-MOFs are much more challenging. This could be attributed to the fact that the bonding interactions between calcium and organic ligands (commonly carboxylates or phosphates) are more ionic, and thus the coordination mode of calcium and the topology of Ca-MOFs largely rely on the nature of the organic ligands as well as the synthetic conditions. However, Ca-MOFs possess several advantages compared to those built on transition metals: 1) Ca-MOFs generally feature high thermal stability because of its high electropositivity which leads to strong, ioniclike bonds with organic ligands (e.g., carboxylates). 2) Calcium is earth-abundant (3.4% of Earth's crust) and nontoxic, making Ca-MOFs relatively inexpensive and environmentally safe, thus especially promising for biological related applications. 3) The lightweight of calcium metal offers gravimetric benefit for gas adsorption/storage related applications.To date, more than 150 Ca-MOFs have been reported (Table 1). These MOFs bear different structural features and have been evaluated for various applications, including molecular separation, drug delivery and controlled release, chemical sensing, and proton conductivity, to name a few. In this...

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“…There are some studies about removal of zinc and cadmium in a multiple ionic system from wastewaters and solutions by using natural zeolite [16,[21][22][23][24][25][26]. For example, Wingenfelder et al [21] investigated the removal of Fe, Pb, Cd, and Zn from synthetic mine waters by a natural zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…However, they did not also investigate the kinetic model for this sorption. Furthermore, Batjargal et al [23] investigated the natural zeolite adsorption capacity of Cd(II), Cu(II), Pb(II), and Zn(II) from aqueous solutions that was measured and fitted using Langmuir and Freundlich isotherm models.…”

Section: Introductionmentioning

confidence: 99%

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Development of kinetic and equilibrium models for removal of Cd²⁺ and Zn²⁺ ions from aqueous solutions by clinoptilolite

Irannajad

Haghighi

Safarzadeh

2015

Env Prog and Sustain Energy

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Removal Characteristics of Cd(II), Cu(II), Pb(II), and Zn(II) by Natural Mongolian Zeolite through Batch and Column Experiments

Cited by 21 publications

References 28 publications

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

Calcium‐Based Metal–Organic Frameworks and Their Potential Applications

Development of kinetic and equilibrium models for removal of Cd²⁺ and Zn²⁺ ions from aqueous solutions by clinoptilolite

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Removal Characteristics of Cd(II), Cu(II), Pb(II), and Zn(II) by Natural Mongolian Zeolite through Batch and Column Experiments

Cited by 21 publications

References 28 publications

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

High Adsorption Pearl‐Necklace‐Like Composite Membrane Based on Metal–Organic Framework for Heavy Metal Ion Removal

Calcium‐Based Metal–Organic Frameworks and Their Potential Applications

Development of kinetic and equilibrium models for removal of Cd2+ and Zn2+ ions from aqueous solutions by clinoptilolite

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Development of kinetic and equilibrium models for removal of Cd²⁺ and Zn²⁺ ions from aqueous solutions by clinoptilolite