Application of polyethylenimine multi-coated adsorbent for Pd(II) recovery from acidic aqueous solution: batch and fixed-bed column studies

Kang, Su Bin; Wang, Zhuo; Won, Sangchul

doi:10.1007/s11814-020-0716-x

Cited by 4 publications

(6 citation statements)

References 26 publications

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“…Nowadays, water contamination problems resulting from the indiscriminate discharge of antibiotic, dye, and heavy metal pollutants have become a leading environmental issue. − As a result of the highly toxic or non-biodegradable components discharged in the water, such an environmental issue not only jeopardizes human health but also can pose a significant threat to the entire ecosystem. , Because dyes are highly toxic and difficult to be degraded even at low concentrations, the dye-containing wastewater has garnered significant concerns . In the past few decades, various methods such as physical, chemical, and biological decolorization have been used to detoxify dye wastewater and have achieved great results in the academic and industrial fields.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Attapulgite for the Adsorption of Methylene Blue: Synthesis, Characterization, and Adsorption Mechanism

et al. 2021

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Attapulgite (denoted as APT, also called palygorskite) has been regarded as the green material in the "21st century world" and has attracted widespread attention due to its advantages of low cost, natural abundance, nontoxic nature, and environmental friendliness. However, the limited adsorption sites and surface charges of natural APT greatly hinder its application as an adsorbent in industrial fields. In this work, natural APT was modified with sodium humate (SA) via a facile one-step hydrothermal process to improve its adsorption capacity and systematically studied its ability to remove methylene blue (MB) from aqueous solutions. The effect of hydrothermal modification in the presence of SA on the microscopic structure, morphology, and physicochemical properties of APT was studied by field-emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction, and Brunauer−Emmett−Teller analyses. The adsorption properties of the modified APT toward MB were evaluated systematically. The results demonstrated that the modified APT has a high adsorption capacity of 227.27 mg/g and also shows a high removal rate up to 99.7% toward MB in a dye solution with an initial concentration of 150 mg/L, which was a 64.7% increase as compared to that of raw APT. The adsorption kinetics could be fitted to the pseudo-second-order model, while the adsorption isotherm could be welldescribed with the Langmuir model. It was concluded that electrostatic attraction, hydrogen-bonding interaction, and chemical association are the main driving force during the adsorption process.

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Section: Introductionmentioning

confidence: 99%

Functionalized Attapulgite for the Adsorption of Methylene Blue: Synthesis, Characterization, and Adsorption Mechanism

et al. 2021

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“…Table 5 summarizes the maximum adsorption capacity of different materials on palladium that have been reported in recent studies. 2,15,17,19,29,30,38,41,44,46,48,53 The adsorption capacity of the adsorbent in this study is relatively superior to other similar mesoporous materials, indicating its promising sorption potential for palladium recovery.…”

Section: ■ Results and Discussionmentioning

confidence: 78%

“…However, their development remains in its infancy and is often accompanied by a long recovery period and difficulty in selecting excellent strains. The wet process has become the most promising to complete enrichment and recovery of precious metals. − In the wet process, according to different mechanisms, it can be divided into adsorption, − ion exchange, complexation–extraction, and precipitation, ,− all of which are effective recovery methods. , Among them, the application of the adsorption method is gradually increasing with the advantages of fast kinetics, high enrichment coefficient, and reduced waste accumulation. In addition, the adsorption method has the advantages of simple operation, wide functionalization, and easy material availability, making it more practical and effective than other methods.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Adsorption and Recovery of Palladium from Spent Catalyst Wastewater by 1,4,7,10-Tetraazacyclododecane-Modified Mesoporous Silica

Zeng

Liu

Xiao

et al. 2022

ACS Sustainable Chem. Eng.

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A new silicon-based adsorbent with good adsorption performance on Pd(II) was synthesized from mesoporous silica as a carrier and 1,4,7,10-tetraazacyclododecane as a functional ligand. The batch method was used to investigate and evaluate the adsorption performance of the adsorbent on Pd(II) in HCl-HNO 3 solution. Influencing factors such as the contact time, pH, temperature, initial Pd(II) concentration, and elution conditions on adsorption and elution were systematically investigated and optimized. Simultaneously, adsorption kinetics, thermodynamics, and adsorption isotherms were investigated. The results revealed that under optimal adsorption conditions, the recovery rate of the adsorbent to Pd(II) could reach 98.30−99.75% in a mixed solution, which was mostly unaffected by other impurity ions. After five adsorption−desorption cycles, the recovery rate of the adsorbent to Pd(II) remained more than 93%. Pd(II) adsorption by the adsorbent was rapid within 30 min, and the recovery rate could reach 85%. In combination with density functional theory calculations, an adequate recovery mechanism was proposed to describe the selective adsorption and desorption process of Pd(II), in which the chemical adsorption dominated. As a result, this material can adsorb and recover Pd(II) with high selectivity, a rapid adsorption rate, good stability, and reusability, making it ideal for recovering waste palladium resources under acidic conditions.

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“…The adsorption and desorption efficiencies were nearly constant at 100% across the five cycles, as illustrated in Figure 8. Desorption by thiourea is pH-dependent [52], and thiourea forms a coordination bond with metal ions at neutral pH but induces desorption by an anion-exchange mechanism with PdCl 4 2- at acidic pH [32]. Since an acidified thiourea solution was used in this study, the desorption is considered to be due to anion exchange.…”

Section: Resultsmentioning

confidence: 99%

“…PEI-CSH was prepared based on previously reported methods with slight modification [32,33]. Briefly, CSH (3 g) and APTES (3 mL) were added to 300 mL of 30% ethanol 300 mL and stirred at 25 °C for 24 h. Then, the APTES-treated CSH was collected by filtration, washed with ethanol several times, and dried overnight at 100 °C.…”

Section: Preparation Of Pei-cshmentioning

confidence: 99%

Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

Kang

Wang

Won

2023

Adsorption Science & Technology

Self Cite

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In this work, a new adsorbent with effective Pd(II) adsorption ability was synthesized using an oyster shell and fumed silica as the matrix materials and polyethyleneimine as the functional ligand. The adsorption performance of the developed adsorbent was evaluated for the recovery of palladium chloride ions (Pd(II)) from strong acid solutions. To understand the characteristics of the materials used in the study, samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and zeta potential analysis. Zeta potential analysis revealed that the isoelectric point of polyethylenimine-crosslinked calcium silicate hydrate (PEI-CSH) was 9.85. Isotherm experiments revealed that the maximum Pd(II) uptake estimated by the Langmuir model was 156.03 mg/g, which was 22.4 and 35.6 times higher than that of the oyster shell powder (OSP) and calcium silicate hydrate (CSH), respectively. The Pd(II) adsorption equilibrium was established in 180 minutes, according to kinetic experiments. These results suggested the possibility of Pd(II) recovery from oyster shell-based adsorbent. Through five adsorption and desorption cycles, the reusability of PEI-CSH was confirmed. PEI-CSH can therefore be considered a potential adsorbent for Pd(II) recovery.

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Application of polyethylenimine multi-coated adsorbent for Pd(II) recovery from acidic aqueous solution: batch and fixed-bed column studies

Cited by 4 publications

References 26 publications

Functionalized Attapulgite for the Adsorption of Methylene Blue: Synthesis, Characterization, and Adsorption Mechanism

Functionalized Attapulgite for the Adsorption of Methylene Blue: Synthesis, Characterization, and Adsorption Mechanism

Highly Selective Adsorption and Recovery of Palladium from Spent Catalyst Wastewater by 1,4,7,10-Tetraazacyclododecane-Modified Mesoporous Silica

Recovery of Palladium from Acidic Solution Using Polyethylenimine-Crosslinked Calcium Silicate Hydrate Derived from Oyster Shell Waste: Adsorption and Mechanisms

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