Adsorption behavior and mechanism of Hg (II) on a porous core-shell copper hydroxy sulfate@MOF composite

Zhang, Ling; Zhang, Jinghua; Li, Xinglin; Wang, Cuijie; Yu, Ajuan; Zhang, Shusheng; Ouyang, Gangfeng; Cui, Yuanyuan

doi:10.1016/j.apsusc.2020.148054

Cited by 50 publications

(9 citation statements)

References 49 publications

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“…Therefore, the adsorption mechanism of CHAP-SH for Hg(II) was mainly chemisorption, including electron exchange and ion exchange between CHAP-SH and Hg(II), and its adsorption rate was limited by chemisorption. 39 , 40 Table 1 shows that the fitting value of the pseudo-second-order model was consistent with the experimental equilibrium adsorption capacity.…”

Section: Results and Discussionsupporting

confidence: 71%

“…Table indicates that the correlation coefficient ( R 2 = 0.9614) of the pseudo-second-order model was closer to 1 than that of the pseudo-first-order model ( R 2 = 0.8888), indicating that the adsorption process of CHAP-SH on Hg(II) could be better described by the pseudo-second-order kinetic model. Therefore, the adsorption mechanism of CHAP-SH for Hg(II) was mainly chemisorption, including electron exchange and ion exchange between CHAP-SH and Hg(II), and its adsorption rate was limited by chemisorption. , Table shows that the fitting value of the pseudo-second-order model was consistent with the experimental equilibrium adsorption capacity.…”

Section: Results and Discussionmentioning

confidence: 99%

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Adsorption and Removal of Mercury(II) by a Crosslinked Hyperbranched Polymer Modified via Sulfhydryl

et al. 2022

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In this study, the highly crosslinked hyperbranched polyamide-amines (H-PAMAMs) were first prepared via one-pot methods and then modified with thiourea to synthesize a novel adsorbent containing sulfhydryl groups (CHAP-SH), which was used to adsorb Hg(II) ions from aqueous solutions. The adsorption characteristics and mechanism of CHAP-SH for Hg(II) ions were systematically studied. As expected, CHAP-SH exhibited a rapid removal performance toward Hg(II), and the maximum adsorption capacity was 282.74 mg/g at 318 K and pH = 4.5. The whole adsorption behavior could be well described by the pseudo-second-order kinetic model and Langmuir and Redlich–Peterson adsorption isotherm models, which reflected that the adsorption process was mainly monolayer chemisorption. Meanwhile, CHAP-SH had strong selectivity for Hg(II) in the presence of multimetal ions, and it had excellent recoverability after five cycles. In order to further elucidate the adsorption mechanism, the adsorbents before and after adsorption were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and energy-dispersive X-ray spectroscopy, and the results showed that the nitrogen-containing, oxygen-containing, and sulfur-containing groups in the adsorbent molecule had synergistic complexation with Hg(II). These results indicated that the adsorbents had great potential in the future treatment of aqueous solutions containing Hg(II).

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Section: Results and Discussionsupporting

confidence: 71%

Section: Results and Discussionmentioning

confidence: 99%

Adsorption and Removal of Mercury(II) by a Crosslinked Hyperbranched Polymer Modified via Sulfhydryl

et al. 2022

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“…Simultaneously, it also can find that adsorption capacity of Hg( ii ) is the lowest at pH = 2 due to the H + competition for adsorption sites. 36,37…”

Section: Resultsmentioning

confidence: 99%

“…Simultaneously, it also can nd that adsorption capacity of Hg(II) is the lowest at pH = 2 due to the H + competition for adsorption sites. 36,37 However, as the solution pH increases continuously, the concentration of H + ions in the solution gradually decreases, and the H + in the -NHgroup in the polymer molecular chain is S1 (in the ESI †).…”

Section: Resultsmentioning

confidence: 99%

Selective adsorption of Hg(ii) with diatomite-based mesoporous materials functionalized by pyrrole–thiophene copolymers: condition optimization, application and mechanism

et al. 2022

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“…At low pH, NH 2 on the surface of adsorbents were positively charged owing to protonation, thus the adsorption was impeded by a large repulsive forces between the protonated amino group Hg(II). Moreover, the existence of a large amount of H + in the solution may compete adsorption with Hg(II) ( Zhang et al, 2021 ). The deprotonation of the NH 2 on adsorbents can effectively coordinate with Hg(II), resulting in increased uptake of Hg(II) as pH increased from 1.0 to 5.0.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Cross-linked Hyperbranched Polyamidoamines Dendrimers for Efficient Hg(Ⅱ) Removal From Water

Geng

Kong

et al. 2021

Front. Chem.

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Dendrimers as commonly used metal ions adsorption materials have the advantages of good adsorption performance and high reuse rate, but the high cost limits its extensive use. Compared with dendrimers, hyperbranched dendrimers have similar physical and chemical properties and are more economical. Therefore, hyperbranched dendrimers are more suitable for industrial large-scale adsorption. The hyperbranched polyamidoamine (HPAMAM) gels were prepared by cross-linking hyperbranched polyamidoamine (HPAMAM-ECH-x and HPAMAM-EGDE-x) with different amounts of epichlorohydrin (ECH) and ethylene glycol diglycidyl ether (EGDE), respectively. The as-synthesized adsorbents were characterized by FT-IR, SEM and XPS. The prepared adsorbents were used to adsorb Hg(Ⅱ) in aqueous solution, and the effects of solution pH, contact time, temperature and initial concentration of metal ion on the adsorption capacity were investigated. The effect of solution pH indicated that the optimum condition to Hg(Ⅱ) removing was at pH 5.0. The adsorption kinetic curves of the two kinds of materials were in accordance with the pseudo-second-order model. For the HPAMAM-ECH samples, the adsorption thermodynamic curves fitted the Langmuir model, while for the HPAMAM-EGDE samples, both Langmuir and Freundlich equations fitted well. The maximum adsorption capacity of HPAMAM-ECH-3 obtained from Langmuir model toward Hg(Ⅱ) was 3.36 mmol/g at pH 5.0 and 35°C.

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Adsorption behavior and mechanism of Hg (II) on a porous core-shell copper hydroxy sulfate@MOF composite

Cited by 50 publications

References 49 publications

Adsorption and Removal of Mercury(II) by a Crosslinked Hyperbranched Polymer Modified via Sulfhydryl

Adsorption and Removal of Mercury(II) by a Crosslinked Hyperbranched Polymer Modified via Sulfhydryl

Selective adsorption of Hg(ii) with diatomite-based mesoporous materials functionalized by pyrrole–thiophene copolymers: condition optimization, application and mechanism

Facile Synthesis of Cross-linked Hyperbranched Polyamidoamines Dendrimers for Efficient Hg(Ⅱ) Removal From Water

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