Chromate separation by selective crystallization

Chen, Xijian; Dai, Xing; Xie, Rongzhen; Li, Jie; Khayambashi, Afshin; Xu, Lei; Yang, Chuang; Shen, Nannan; Wang, Yaxing; He, Lihua; Zhang, Yugang; Xiao, Chengliang; Chai, Zhifang; Wang, Shuao

doi:10.1016/j.cclet.2019.11.034

Cited by 12 publications

(9 citation statements)

References 35 publications

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“…Currently, global environmental pollution is becoming a significantly serious problem as a result of continuous activity of humans. Numerous heavy metal ions such as Fe 3+ , Cd 2+ , Pb 2+ , and Hg 2+ together with toxic organic molecules like dye pollutants have been discharged to the water and soil, which directly or indirectly influences the health of human beings and other animals. − Among these harmful species, Fe 3+ is a ubiquitous and important metal ion that has been widely employed and studied. However, though it plays a vital role in many biological processes, including DNA/RNA synthesis, oxygen metabolism, hemoglobin formation, muscle and brain function, etc., excessive or deficient iron in living cells could affect the immune system, resulting in serious physiological damages and pathological disorders.…”

Section: Introductionmentioning

confidence: 99%

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

Xue

Guan

et al. 2020

Crystal Growth & Design

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In virtue of the dual-ligand strategy, a novel Zn(II)organic coordination polymer [Zn(tipb)(bpda) 0.5 •(OH)] n (1) (tipb = 1,3,5-tris(p-imidazolylphenyl)benzene, H 2 bpda = 4,4′biphenyldicarboxylic acid) has been successfully constructed with a N-donor tridentate ligand and an O-containing linear linker. In compound 1, a double-layer network is fabricated wherein adjacent Zn-tipb layers are pillared by bpda 2− . Mutual interpenetration of the parallel layers further generates a 3D cationic supramolecular architecture. Interestingly, compound 1 displays a high sensitivity for the recognition of iron(III) ion with the calculated K sv value being 1.06 × 10 4 M −1 . In addition, the competitive detection experiment shows that the detection of Fe 3+ could not be affected by any other interfering cations, suggesting the high selectivity of 1 toward the sensing of targeted species. Moreover, compound 1 can effectively capture anionic dye pollutants such as methyl orange and Congo red through the process of ion exchange, indicating the great possibility of 1 as a promising absorbent for the treatment of dye-wastewater.

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Section: Introductionmentioning

confidence: 99%

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

Xue

Guan

et al. 2020

Crystal Growth & Design

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“…53 Instead, the high binding affinity of chromate with iCONs is likely a result of the strong ion−ion interaction between chromate and guanidinium units. 60,61 In contrast, the structural variations in iCONs had pronounced impacts on the arsenate uptake (Q e As , Figure 4a, blue bars). First, the conformation of the guanidinium hydrogen bond donors appeared to play a decisive role in the adsorption of arsenate.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

“…Interestingly, the Q e Cr /(IEC/2) values were comparable between iCONs with syn- ( III ) and anti- hydrogen bonding conformations ( II ) at the guanidinium sites, suggesting that the parallel bidentate hydrogen bonding interactions with tetrahedral oxoanion are not essential to chromate adsorption . Instead, the high binding affinity of chromate with iCONs is likely a result of the strong ion–ion interaction between chromate and guanidinium units. , …”

Section: Resultsmentioning

confidence: 94%

Guanidinium-Based Ionic Covalent-Organic Nanosheets for Sequestration of Cr(VI) and As(V) Oxoanions in Water

Damron

Bryantsev

et al. 2021

ACS Appl. Nano Mater.

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Chromium- and arsenic-based oxoanions are among the major highly toxic and carcinogenic inorganic pollutants present in groundwater, demanding fast and selective sequestration. Efficient capturing and removal of these highly mobile oxometallates at neutral pH presents a great challenge in groundwater cleanup. Herein, a series of guanidinium-based ionic organic covalent nanosheets (iCONs) with varying hydrogen bonding, steric, and electronic properties was studied to examine the structure–activity relationship in the adsorption and removal of chromium- and arsenic-based oxoanions in water. Structural modulations in iCONs were found to alter the guanidinium acidity, thus regulating the oxoanion uptake limits via ion exchange. The hydrogen bonding, steric, and electrostatic interactions at/near the guanidinium-based anion binding site in iCONs exerted heavy influences on the uptake efficiency and selectivity of arsenate but not on those of chromate. Further analyses revealed that the parallel bidentate hydrogen bonding interactions play a key role in the weak binding of arsenate to the protonated/positively charged guanidine motifs, whereas the strong ion–ion interactions between chromate and guanidinium appear to be more tolerant to the geometric and structural perturbation.

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“…37,38 Therefore, balancing the nature of the hydrophilicity and hydrophobicity is the key to obtaining the proper precipitants for isolating TcO 4 − . Inspired by works of Custelcean et al 39 and Wang et al, 40 we reported a series of polydentate benzene-aminoguanidinium (PBGs) ligands that can be easily prepared using an aldimine condensation reaction within a couple of hours. PBGs can form extremely insoluble crystalline compounds with aqueous ReO 4 − /TcO 4 − instantaneously that is beneficial for the separation of ReO 4 − /TcO 4 − from an aqueous solution even at a relatively low pH.…”

Section: ■ Introductionmentioning

confidence: 99%

⁹⁹TcO₄^– Separation through Selective Crystallization Assisted by Polydentate Benzene-Aminoguanidinium Ligands

et al. 2021

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99 Tc is one of the most abundant radiotoxic isotopes in used nuclear fuel with a high fission yield and a long half-life. Effective removal of pertechnetate (TcO 4 − ) from an aqueous solution is important for nuclear waste separation and remediation. Herein, we report a series of facilely obtained benzene-linked guanidiniums that could precipitate TcO 4 − and its nonradioactive surrogate ReO 4 − from a high-concentration acidic solution through self-assembly crystallization. The resulting perrhenate and pertechnetate solids exhibit exceptionally low aqueous solubility. The benzene-linked guanidiniums hold one of the highest TcO 4 − removal capacities (1279 mg g −1 ) among previously reported materials and possess a removal percentage of 59% for ReO 4 − in the presence of Cl − over 50 times. The crystallization mechanism was clearly illustrated by the single-crystal structures and density functional theory calculations, indicating that TcO 4− is captured through a charge-assisted hydrogen bonding interaction and stabilized by π−π stacking layers. In addition, the removal process is easily recycled and no toxic organic reagents are introduced. This work provides a green approach to preliminarily separate TcO 4− from high-level nuclear wastes.

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Chromate separation by selective crystallization

Cited by 12 publications

References 35 publications

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

Guanidinium-Based Ionic Covalent-Organic Nanosheets for Sequestration of Cr(VI) and As(V) Oxoanions in Water

⁹⁹TcO₄^– Separation through Selective Crystallization Assisted by Polydentate Benzene-Aminoguanidinium Ligands

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Chromate separation by selective crystallization

Cited by 12 publications

References 35 publications

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe3+ and Efficient Capture of Anionic Dyes

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe3+ and Efficient Capture of Anionic Dyes

Guanidinium-Based Ionic Covalent-Organic Nanosheets for Sequestration of Cr(VI) and As(V) Oxoanions in Water

99TcO4– Separation through Selective Crystallization Assisted by Polydentate Benzene-Aminoguanidinium Ligands

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A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

A Zn(II)-Based Coordination Polymer Featuring Selective Detection of Fe³⁺ and Efficient Capture of Anionic Dyes

⁹⁹TcO₄^– Separation through Selective Crystallization Assisted by Polydentate Benzene-Aminoguanidinium Ligands