Metal–organic frameworks (MOFs) as highly efficient agents for boron removal and boron isotope separation

Lyu, Jiafei; Liu, Hongxu; Zhang, Jingshuang; Zeng, Zhouliangzi; Bai, Peng; Guo, Xianghai

doi:10.1039/c6ra26588j

Cited by 16 publications

(4 citation statements)

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“…in which α 0 refers to initial abundance of 10 B/ 11 B in boron solution, α 1 refers to 10 B/ 11 B abundance of the solution after adsorption, c 0 refers to initial concentration of boron solution, c 1 refers to the boron concentration of the solution after adsorption. 40 As is shown in Figure 7b, for CL-MCM-41, the separation performance of 10 B and 11 B at low pH was better than that at high pH, with the maximun separation factor 1.148 at pH 2. At higher pH from 7 to 12, the separation factor was lower but still remained around 1.10.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 76%

“…On the basis of the boron concentration and isotopic abundance ( 10 B/ 11 B), the separation factor of 10 B and 11 B can be calculated with the following formula: in which α 0 refers to initial abundance of 10 B/ 11 B in boron solution, α 1 refers to 10 B/ 11 B abundance of the solution after adsorption, c 0 refers to initial concentration of boron solution, c 1 refers to the boron concentration of the solution after adsorption …”

Section: Resultsmentioning

confidence: 99%

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Synthesis, Characterization, Adsorption, and Isotopic Separation Studies of Pyrocatechol-Modified MCM-41 for Efficient Boron Removal

Chen

Lyu

Wang

et al. 2019

Ind. Eng. Chem. Res.

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Selected by the conductive value change (Δ) caused by generated proton in the boric acid-polyol solutions, pyrocatechol (CL) and nitropyrocatechol (NCL) were grafted into the mesoporous MCM-41 material for boron removal and isotopic separation. The adsorption kinetics, isotherms and thermodynamics, effect of pH, adsorption mechanism, regeneration, and isotopic separation performance on the new materials were explored in this study. The adsorption equilibrium was reached within 10 h, with the maximum boron adsorption capacity reaching up to 1.799 mmol g −1 for CL-MCM-41 at pH 9 and 1.548 mmol g −1 for NCL-MCM-41 at pH 12, respectively. In addition, the boron isotopic separation factor was measured to be 1.158, which was significantly higher than that of commercial IRA 743. After four cycles of elution with acetic acid of low concentration, approximately 80% of the original adsorption capacity could be maintained, which also outperformed the commercial resins.

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Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, Adsorption, and Isotopic Separation Studies of Pyrocatechol-Modified MCM-41 for Efficient Boron Removal

Chen

Lyu

Wang

et al. 2019

Ind. Eng. Chem. Res.

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“…As shown in Figure 5b,c, the binding energy changes at the Cl 2p peaks and Cr 2p peaks after H 2 O adsorption, indicating the interactions between Cl of [Zn 2 Cl 5 ] – , Cr of MIL‐101(Cr) and H 2 O molecules. [ 53 ] In addition, the alkyl chain of [BOHmim] + cation can also provide a certain space for water adsorption. To verify the influence of free space on the adsorption capacity, another kind of ILs ([POHmim][Zn 2 Cl 5 ]) with a shorter alkyl chain (chloropropanol (3‐chloro‐1‐propanol)) was used as a control experiment to form [POHmim][Zn 2 Cl 5 ]@MIL‐101(Cr)‐60%.…”

Section: Resultsmentioning

confidence: 99%

Confinement–Unconfinement Transformation of ILs in IL@MOF Composite with Multiple Adsorption Sites for Efficient Water Capture and Release

Han

Yang

et al. 2022

Adv Materials Inter

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However, these adsorbents have obvious drawbacks in balancing the adsorption capacity and desorption conditions because of too weak or too strong hydrophilicity. [21] Therefore, it is necessary to develop novel porous functional materials with efficient water capture and release performance from atmosphere.Metal-organic frameworks (MOFs) have emerged as a class of porous materials by self-assembly of inorganic metal clusters and organic linkers. They have high porosities and internal surface areas, as well as diversity in chemistry and structure. [24] As a result of these attractive features, MOFs are promising candidates to capture water. Recently, there is a growing interest to search novel MOFs to achieve high water uptakes. [22,25] For example, at the low relative humidity relating to water harvesting in the desert, Yaghi et al. demonstrated that substantial progress has been made in some materials, such as MOF-801, [26] and MOF-303. [27,28] At the high relative humidity, Zhao et al. utilized PNIPAM@MIL-101(Cr) to obtain high water adsorption (RH = 96%, 440 wt%). [16] In the range of test pressure, the high water adsorption capacity is mainly attributed to the specific surface area and pore volume of MOF. For instance, the water adsorption capacity of Cr-soc-MOF-1 is almost 200 wt% due to the specific surface area of 4590 m 2 g −1 and pore volume of 2.1 cm 3 g −1 , while further improvement of uptake is hindered by the limitation of pore volume. [29] Meanwhile, the release of adsorbed water is important from the practical point of view. [15] Considering the preferred low-grade waste heat sources or even low-cost solar resources, the ideal condition is that the desorption temperature should be lower than 323 K. [30][31][32] Unfortunately, the reported regeneration temperatures of most MOF materials are higher than expected. To address these challenges, developing solid-liquid hostguest composites (SLHGCs) may be a possible solution. It uses solid as the main material and functional liquid as the guest one. Porous solid material can provide limited space and strong capillary force for carrying functional liquid. [33] As a kind of functional liquid, ionic liquids (ILs) are rich in polar groups and adsorption sites, [34,35] and nano-confined ILs by loading ILs into porous materials can be a versatile strategy to prepare composites with a combination of their favorable characteristics. The impregnation of ILs inside the Water adsorption based on porous materials is of fundamental importance in atmospheric water harvesting and dehumidification. Herein, a [BOHmim] [Zn 2 Cl 5 ]@MIL-101(Cr) composite with multiple adsorption sites is designed to enhance the water adsorption capacity. It is interesting to observe that there is a water-responsive confinement-unconfinement transformation of ionic liquids (ILs) during the water adsorption and release process. Thus, it can simultaneously overcome the limitation of pore volume in traditional porous materials, and the problem of mass transfer in pure ILs. As a result, the ob...

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“…Therefore, it is vital to enrich and reuse boron resources . At present, boron separation processes have mainly focused on acidification crystallization, extraction, flotation, membrane technology, and electrocoagulation (EC). , Among these, adsorption is considered to be the most promising method due to its simple operation and high selectivity. ,− Activated carbon, − ion-exchange resins, − metal–organic framework (MOF) materials, − layered double hydroxides (LDHs), and nanomaterials have been used to adsorb and separate boron; however, these adsorbents have limitations in terms of their adsorption capacity, rate and separation, and recovery. ,− Therefore, it is necessary to develop excellent adsorbents for the effective removal of B from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Selective Removal of Boron from Aqueous Solutions Using ECH@NGM Aerogels with Excellent Hydrophilic and Mechanical Properties: Performance and Response Surface Methodology Analysis

Pan

Gan

et al. 2022

Langmuir

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The remediation of environmental boron contamination has received extensive research attention. The adsorbent ECH@NGM aerogel with high hydrophilic and mechanical properties was synthesized to remove boron. The ECH@NGM aerogel had a high adsorption capacity of 81.11 mg/g, which was 14.50% higher than that of commercial boron-selective resin Amberlite IRA743. The Freundlich model and pseudo-second-order model described the adsorption behavior well. In addition, the response surface methodology (RSM) could predict the experimental outcomes and optimize the reaction conditions, and X-ray photoelectron spectroscopy (XPS) and control tests were utilized to investigate probable adsorption mechanisms. These data showed that the B ← N coordination bond was the primary adsorption force. The adsorbent had good resistance to interference from coexisting salts, high reusability, good adsorption performance even after five reuse cycles, and a high desorption rate in a relatively short time. The adsorption performance in real brines could be maintained at 80%. Therefore, this work not only provided ECH@NGM aerogels for the removal of boron from brine but also elucidated the main adsorption processes between N-containing adsorbents and boron, facilitating the design of future adsorbents for boron removal.

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Metal–organic frameworks (MOFs) as highly efficient agents for boron removal and boron isotope separation

Abstract: A variety of MOFs were observed with ZIF-8, to our knowledge, showing the highest boron uptake and MIL-101(Cr) with an unprecedentedly high boron isotope separation factor.

Cited by 16 publications

References 50 publications

Synthesis, Characterization, Adsorption, and Isotopic Separation Studies of Pyrocatechol-Modified MCM-41 for Efficient Boron Removal

Synthesis, Characterization, Adsorption, and Isotopic Separation Studies of Pyrocatechol-Modified MCM-41 for Efficient Boron Removal

Confinement–Unconfinement Transformation of ILs in IL@MOF Composite with Multiple Adsorption Sites for Efficient Water Capture and Release

Selective Removal of Boron from Aqueous Solutions Using ECH@NGM Aerogels with Excellent Hydrophilic and Mechanical Properties: Performance and Response Surface Methodology Analysis

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