Fast and effective recovery of Au(III) from aqueous solution by a N-containing polymer

Zhou, Shuxian; Xu, Weifeng; Hu, Chenghong; Zhang, Panliang

doi:10.1016/j.chemosphere.2020.127615

Cited by 46 publications

(9 citation statements)

References 39 publications

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“…These findings suggest that the second-order kinetic model is more accurate in describing the adsorption process with a better correlation. The second-order kinetics assumes that the adsorption process is chemisorption, so it can be concluded that chemisorption may play a role in the adsorption of S-PPor-1 to Au(III) …”

Section: Resultsmentioning

confidence: 99%

“…The second-order kinetics assumes that the adsorption process is chemisorption, so it can be concluded that chemisorption may play a role in the adsorption of S-PPor-1 to Au(III). 54 The intraparticle diffusion model is also used to study the adsorption process. Figure 3f reveals three phases of the adsorption process, indicative of distinct stages.…”

Section: Table 1 Isotherm Parameters For Adsorption Of Au(iii) By S-p...mentioning

confidence: 99%

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Enhanced Recovery of Au(III) under Neutral pH Conditions Using Polysulfide-Porphyrin Polymers

Wang,

Lu,

Cui

et al. 2024

ACS Appl. Polym. Mater.

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Adsorbents capable of high extraction of gold from complex sources, especially electronic waste (EW) and seawater, are needed for gold resource sustainability and effective recycling. Herein, polysulfide-porphyrin polymers (S-PPors) that can effectively extract gold from complex matrices have been successfully developed. Among them, S-PPor-1 exhibited an adsorption rate of 97.59% at pH = 6.0. The adsorption capacity of S-PPor-1 for Au(III) reached 833.33 and 2000.00 mg/g, respectively, at 25 and 55 °C under the environment of pH = 6, which was more suitable for the adsorption of Au(III) under neutral conditions. The optimum adsorption effect occurs at 55 °C and pH 6. The high adsorption rate mainly depends on the complexation and oxidation–reduction. When 10 mL of eluent was selected, the adsorption rate of S-PPor-1 remained above 85% after seven cycles. Finally, S-PPor-1 selectively and efficiently extracted Au(III) from high-salt solutions as well as EW leaching solutions, showing great potential for the recovery of gold from these substrates.

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Section: Resultsmentioning

confidence: 99%

Section: Table 1 Isotherm Parameters For Adsorption Of Au(iii) By S-p...mentioning

confidence: 99%

Enhanced Recovery of Au(III) under Neutral pH Conditions Using Polysulfide-Porphyrin Polymers

Wang,

Lu,

Cui

et al. 2024

ACS Appl. Polym. Mater.

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“…eV), C-H (287.9 eV) [29,30] ; the N 1s spectrum (Fig. 2f) was divided into a doublet, namely C-N (399.53 eV) and C=N (400.1 eV) [29,30]; the S 2p spectrum (Fig. 2g) was divided into C-S ( 164.39 eV) and S-S (168.74 eV) [31,32].…”

Section: Characterization and Analysis Of Ctopmentioning

confidence: 99%

“…2d) which was to be 74.98 m 2 /g, indicated that CTOP is a microporous polymer. eV), C-H (287.9 eV) [29,30] ; the N 1s spectrum (Fig. 2f) was divided into a doublet, namely C-N (399.53 eV) and C=N (400.1 eV) [29,30]; the S 2p spectrum (Fig.…”

Section: Characterization and Analysis Of Ctopmentioning

confidence: 99%

Synthesis of Covalent Thiourea Organic Polymer (CTOP) and Adsorption of Au (Ⅲ)

Wang

Zheng

Liu

et al. 2023

Preprint

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In this paper, the covalent organic polymer of enaminone was modified by thiourea, and the covalent organic polymer of thiourea (CTOP) was synthesized by simple solvothermal method. At 25 ℃, the adsorption capacity of the polymer for trivalent gold ion is 2372.7 mg/g. In the mixed aqueous solution of divalent cadmium ion, trivalent gold ion, divalent copper ion, divalent cobalt ion and divalent nickel ion, CTOP can only adsorb trivalent gold ion, which indicates that CTOP has high selective adsorption performance for trivalent gold ion. In addition, CTOP material still maintains high adsorption performance after five adsorption cycles, which proves that the adsorption material has good reusability. According to the experimental results of adsorption kinetics and thermodynamics, the adsorption process of CTOP for trivalent gold ions conforms to the quasi second order adsorption model and Langmuir adsorption model, that is, the adsorption process of CTOP for trivalent gold ions is single-layer chemical adsorption. CTOP not only has strong adsorption and selectivity to Au (Ⅲ), but also has good reusability. Therefore, it is an ideal environmental functional material, which can be used to separate and enrich trivalent gold ions in wastewater.

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“…In recent years, molecular recognition technology (MRT) that uses specially designed ligands with metalpreferred binding sites has been successfully employed for solvent extraction of alkali metal cations and Au III from leaching solutions. [4,14] Such an idea in ligand design is also used to prepare new and efficient porous adsorbents such as metal-organic frameworks (MOFs), [1,5,[15][16][17][18] porous organic polymers (POPs), [19][20][21] and biomass materials, [11,22] to achieve high uptake capacity and high selectivity (Figure 1). However, as a consequence of the strong binding affinity between the captured guest [AuCl 4 ] À /AuCl and the porous host framework, most of these systems often involve low desorption efficiency and poor reusability under actual extraction conditions, thus restricting their potential applications in practical industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Porous Covalent Organic Framework Based Hydrogen‐Bond Nanotrap for the Precise Recognition and Separation of Gold

Qiu

et al. 2023

Angew Chem Int Ed

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Utilizing weak interactions to effectively recover and separate precious metals in solution is of great importance but the practice remains a challenge. Herein, we report a novel strategy to achieve precise recognition and separation of gold by regulating the hydrogen-bond (H-bond) nanotrap within the pore of covalent organic frameworks (COFs). It is found that both COF-HNU25 and COF-HNU26 can efficiently capture Au III with fast kinetics, high selectivity, and uptake capacity. In particular, the COF-HNU25 with the high density of H-bond nanotraps exhibits an excellent gold uptake capacity of 1725 mg g À 1 , which is significantly higher than that (219 mg g À 1 ) of its isostructural COF (COF-42) without H-bond nanostrap in the pores. Importantly, the uptake capacity is strongly correlated to the number of H-bonds between phenolic OH in the COF and [AuCl 4 ] À in water, and multiple H-bond interactions are the key driving force for the excellent gold recovery and reusability of the adsorbent.

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Fast and effective recovery of Au(III) from aqueous solution by a N-containing polymer

Cited by 46 publications

References 39 publications

Enhanced Recovery of Au(III) under Neutral pH Conditions Using Polysulfide-Porphyrin Polymers

Enhanced Recovery of Au(III) under Neutral pH Conditions Using Polysulfide-Porphyrin Polymers

Synthesis of Covalent Thiourea Organic Polymer (CTOP) and Adsorption of Au (Ⅲ)

Porous Covalent Organic Framework Based Hydrogen‐Bond Nanotrap for the Precise Recognition and Separation of Gold

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