Efficient adsorption toward precious metal from aqueous solution by zeolitic imidazolate framework-8

Hu, Chenghong; Xu, Weifeng; Mo, Xiaohui; Li, Hua; Zhou, Siman; Zhang, Panliang

doi:10.1007/s10450-018-9981-y

Cited by 33 publications

(10 citation statements)

References 45 publications

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“…Besides, the Weber‐Morris intraparticle diffusion model is not suitable for describing the adsorption process of NH 2 ‐ZIF‐8 towards Au (III)/Ag(I), which is consistent with the result of Pore diameter distribution. Compared with the pure ZIF‐8, The equilibrium time for Au (III) reduces from 42 hr to 1.5 hr, and from 4 hr to 2 hr for Ag(I) . This reduction can be explained by the increase in the number of active sites upon the introduction of amine groups, which improves the adsorption kinetics for the Au (III) and Ag(I) ions.…”

Section: Resultsmentioning

confidence: 99%

“…As listed in Table , the BET specific surface area and micropore volume are 1254 m 2 ·g −1 and 0.53 cm 3 ·g −1 , respectively. The grafted amino group makes the surface area slightly decreased compared with the ZIF‐8, while not change the pore size distribution ranging from 10 to 70 nm (Figure d) . The FT‐IR spectra of ZIF‐8 and NH 2 ‐ZIF‐8 before and after adsorption in the range of 3900 to 400 cm −1 were investigated for further study of the adsorption mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous work, ZIF‐8 was explored to recover Au (III) and Ag(I) from water. It exhibits good adsorption capacity and great reutilization, while showing slow adsorption rate . The adsorption mechanism of ZIF‐8 towards Au (III) and Ag(I) includes electrostatic attraction and redox.…”

Section: Introductionmentioning

confidence: 99%

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Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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In this paper, zeolitic imidazolate framework‐8 modified by the ethanediamine (NH2‐ZIF‐8) was employed for adsorbing Au (III) and Ag(I) from aqueous solutions. The adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) were found to be significantly affected by the pH values of the solution. The adsorption kinetics studies show that NH2‐ZIF‐8 presents a fast adsorption property towards metals, attaining 93% of adsorption equilibrium uptake for Au (III) within the first 30 min. This phenomenon can be ascribed to the coordination interaction between the amino group and Au (III). The thermodynamic data suggest that the adsorption of NH2‐ZIF‐8 towards Au (III) is endothermic process, while that for Ag(I) is exothermic. The maximum adsorption capacities of NH2‐ZIF‐8 toward Au (III) and Ag(I) can be achieved to 357 mg·g−1 and 222.25 mg·g−1, respectively. The metal ions interference results show that Cu (II) and Ni (II) hardly have no interference on Au (III) adsorption in e‐waste containing 1500 mg·l−1 Cu (II),100 mg·l−1 Ni (II) and 10 mg·l−1 Au (III); while for Ag(I), Cd (II) and Zn (II) have little interference on Ag(I) adsorption in the hybrid solutions containing Ag(I), Ni (II), Cd (II) and Zn (II) with equal concentration (50 mg·l−1), but Ni (II) interference most. The XPS study shows that partial Au (III) was reduced to Au(I), and that Ag(I) was completely reduced to Ag(0) during the adsorption process. The abundant of active sites of NH2‐ZIF‐8 containing C=N, N‐H, and Zn‐OH groups play a key role in the adsorption of Au (III) and Ag(I). In addition, electrostatic interaction can be responsible for the adsorption of Au (III) by NH2‐ZIF‐8. The regeneration experiments results show that the adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) can maintain after three cycles. This work provides a reliable method to improve the adsorption kinetics for metal ions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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“…In recent years, methods such as co-precipitation [ 11 ], adsorption [ 12 , 13 , 14 , 15 , 16 ], electrochemical [ 17 ], bioleaching and solvent extraction [ 18 , 19 ], etc., have been used to extract precious metals from solutions. Among these methods, adsorption is considered to be a hopeful method, given the advantages of high efficiency, simple operation, and lower wastes discharge [ 12 , 13 , 14 , 15 , 16 ]. Much research has been conducted on the recovery of gold in precious metal solutions.…”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption, Reduction, and Separation of Au(III) from Aqueous Solution with Amine-Type Non-Woven Fabric Adsorbents

Huang

et al. 2020

Materials

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Herein, adsorption, separation, and reduction of Au(III) from its aqueous solution were studied with different amine-type, non-woven fabric (NF) adsorbents fabricated with radiation-induced graft polymerization. The adsorbents exhibited different adsorption capacities of Au(III) over a concentration range of hydrochloric acid (HCl) from 5 mM to 5 M, and the diethylamine (DEA)-type adsorbent performed best under all test conditions. The DEA-type adsorbent was inert toward other metal ions, including Cu(II), Pb(II), Ni(II), Zn(II) and Li(I), within the fixed concentration range of HCl. Flow-through adsorption tests indicated DEA-type adsorbent exhibited a rapid recovery and high adsorption capacity of 3.23 mmol/g. Meanwhile, DEA-type adsorbent also exhibited high selectivity and rapid extraction for Au(III) from its mixed solution with Pt(IV) and Pd(II). After adsorption, the reduction of Au(III) was confirmed by XRD spectra, TEM, and digital micrograph images. The results indicated that nano-sized Au particles were mainly concentrated on the adsorbent in 5 mM HCl solution. In 1 M HCl solution, not only nano-sized Au particles were found, but also micro-size Au plates precipitation occurred. This study provides a novel material for selective and efficient gold uptake from aqueous solution.

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“…Zeolitic imidazolate frameworks (ZIFs) are important branches of MOFs, which is a new type of nanoporous material with zeolite topology formed by linking transition metal atoms (Zn) with imidazole or imidazole derivatives. − Compared with zeolite, transition metal ions replace silicon and aluminum in traditional zeolites, and imidazole esters replace oxygen bridges in traditional zeolites . Meanwhile, ZIFs possess zeolite topology in which divalent metal cations are linked to a tetrahedral framework by imidazole acid anions, resulting in a large surface area and pore volume and unique inherent biodegradability. − So far, ZIF-8 has been widely used in catalytic magnetic separation, magnetic resonance, drug delivery, − imaging, and other areas, but there are few reports on the adsorption of fluorescent probes.…”

Section: Introductionmentioning

confidence: 99%

Investigating Adsorption/Desorption of DNA on ZIF-8 Surface by Fluorescently Labeled Oligonucleotides

et al. 2019

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As an important subclass of MOFs, ZIF-8, built from 2-methylimidazole and Zn(NO3)2·6H2O, possesses excellent biocompatibility and high stability in aqueous solution. Recently, it has been found that ZIF-8 can efficiently adsorb DNA and quench the adsorbed fluorophores to a large extent. These properties make it possible to prepare DNA-based optical sensors using ZIF-8. Although practical analytical applications are being demonstrated, the basic understanding of the binding between ZIF-8 and DNA in solution has received relatively little attention. In this work, we report that the adsorption of 12-, 18-, 24-, and 36-mer single-stranded DNAs on ZIF-8 are affected by several factors. It is found from the outcomes that shorter DNAs are adsorbed more rapidly to the surface of ZIF-8. On the other hand, desorption of the probe DNA can be achieved using complementary strand DNA to restore the fluorescence value. Furthermore, the salt contributes to adsorption to some extent. These findings are important for further understanding of the interactions between DNA and ZIF-8 and for the optimization of DNA and MOF-based devices and sensors.

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Efficient adsorption toward precious metal from aqueous solution by zeolitic imidazolate framework-8

Cited by 33 publications

References 45 publications

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Selective Adsorption, Reduction, and Separation of Au(III) from Aqueous Solution with Amine-Type Non-Woven Fabric Adsorbents

Investigating Adsorption/Desorption of DNA on ZIF-8 Surface by Fluorescently Labeled Oligonucleotides

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