Highly-efficient separation and recovery of ruthenium from electroplating wastewater by a mesoporous silica-polymer based adsorbent

Zhang, Shichang; Ning, Shunyan; Liu, Hefang; Zhou, Jie; Wang, Siyi; Zhang, Wei; Wang, Xinpeng; Wei, Yuezhou

doi:10.1016/j.micromeso.2020.110293

Cited by 44 publications

(16 citation statements)

References 51 publications

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“…The adsorption rate is correlated with the slope of each linear segment presented in Figure 15 c, a higher slope being correlated with a fasted adsorption of As(III) onto the studied adsorbent material [ 53 , 56 ]. From this figure, it can be observed that the slope of the first linear dependence is higher than the slope of the second linear dependence, meaning that stage 1 of the adsorption represents the velocity determinant stage, and the intraparticulate diffusion represents the limiting speed rate in stage two due to the low availability of the As(III) ions into the solution [ 54 , 57 ]. From the data presented in Table 4 , it can be observed that with increasing temperature, the k diff value also increases.…”

Section: Resultsmentioning

confidence: 99%

Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal

et al. 2022

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This study aims to remove arsenic from an aqueous medium by adsorption on a nanocomposite material obtained by the sol–gel method starting from matrices of silica, iron oxide and NaF (SiO2/Fe(acac)3/NaF). Initially, the study focused on the synthesis and characterization of the material by physico–chemical methods such as: X-ray diffraction, FT-IR spectroscopy, Raman spectroscopy, atomic force microscopy, and magnetization. Textural properties were obtained using nitrogen adsorption/desorption measurements. The zero load point, pHpZc, was also determined by the method of bringing the studied system into equilibrium. In addition, this study also provides a comprehensive discussion of the mechanism of arsenic adsorption by conducting kinetic, thermodynamic and equilibrium studies. Studies have been performed to determine the effects of adsorbent dose, pH and initial concentration of arsenic solution, material/arsenic contact time and temperature on adsorption capacity and material efficiency. Three theoretical adsorption isotherms were used, namely Langmuir, Freundlich and Sips, to describe the experimental results. The Sips isotherm was found to best describe the experimental data obtained, the maximum adsorption capacity being ~575 µg As(III)/g. The adsorption process was best described by pseudo-second order kinetics. Studies have been performed at different pH values to establish not only the optimal pH at which the adsorption capacity is maximum, but also which is the predominantly adsorbed species. The effect of pH and desorption studies have shown that ion exchange and the physiosorption mechanism are implicated in the adsorption process. From a thermodynamic point of view, parameters such as ΔG°, ΔH° and ΔS° were evaluated to establish the mechanism of the adsorption process. Desorption studies have been performed to determine the efficiency of the material and it has been shown that the material can be used successfully to treat a real-world example of deep water with a high arsenic content.

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Section: Resultsmentioning

confidence: 99%

Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal

et al. 2022

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“…From the data presented in Table 4 it is observed that with increasing temperature the K diff value also increases. It is also observed that, specific to stage 1, the diffusion constants are higher than the diffusion constants specific to stage 2, which allows us to state that the determinant of velocity is stage 1 and that in stage 2 the process is slower [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Indium Recovery by Adsorption on MgFe2O4 Adsorbents

et al. 2022

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Indium and its compounds have many industrial applications and are widely used in the manufacture of liquid crystal displays, semiconductors, low temperature soldering, and infrared photodetectors. Indium does not have its own minerals in the Earth’s crust, and most commonly, indium is associated with the ores of zinc, lead, copper and tin. Therefore, it must be recovered as a by-product from other metallurgical processes or from secondary raw materials. The aim of this study is to investigate the adsorption properties for recovering indium from aqueous solutions using iron–magnesium composite (MgFe2O4). In addition, the results show that the material offers very efficient desorption in 15% HCl solution, being used for 10 adsorption–desorption cycle test. These results provide a simple and effective process for recovering indium. Present study was focuses on the synthesis and characterization of the material by physico-chemical methods such as: X-ray diffraction, FT-IR spectroscopy, followed by the adsorption tests. The XRD indicates that the MgFe2O4 phase was obtained, and the crystallite size was about 8 nm. New prepared adsorbent materials have a point of zero charge of 9.2. Studies have been performed to determine the influence of pH, initial indium solution concentration, material/solution contact time and temperature on the adsorption capacity of the material. Adsorption mechanism was established by kinetic, thermodynamic and equilibrium studies. At equilibrium a maximum adsorption capacity of 46.4 mg/g has been obtained. From kinetic and thermodynamic studies was proved that the studied adsorption process is homogeneous, spontaneous, endothermic and temperature dependent. Based on Weber and Morris model, we can conclude that the In (III) ions takes place at the MgFe2O4/In (III) solution–material interface.

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“…Additionally, it can be observed that the diffusion constant specific for first stage of adsorption is higher than the one specific for the second stage of adsorption. Based on that was concluded that the speed determining stage is the second one [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Molybdate Recovery by Adsorption onto Silica Matrix and Iron Oxide Based Composites

Matusoiu

Negrea

Ciopec

et al. 2022

Gels

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Aggressive industrial development over the last century involved different heavy metals being used, including high quantities of molybdenum, which need to be treated before discharge in industrial waters. Molybdenum’s market price and industrial applicability make its recovery a big challenge. In the present study the possibility to recover molybdenum ions from aqueous solutions by adsorption on a composite material based on silica matrix and iron oxides—SiO2FexOy—was evaluated. Tests were performed in order to determine the influence of adsorbent material dose, initial solution pH, contact time and temperature over adsorption capacity of synthesized adsorbent material. For better understanding of the adsorption process, the obtained experimental data were modelled using Langmuir, Freundlich and Sips adsorption isotherms. Based on the obtained data, it can proved that the Sips isotherm was describing with better orderliness the studied process, obtaining a maximum adsorption capacity of 10.95 mg MoO42− for each gram of material. By modelling the studied adsorption process, it was proven that the pseudo-second order model is accurately describing the adsorption process. By fitting experimental data with Weber-Morris model, it was proven that MoO42− adsorption is a complex process, occurring in two different steps, one controlled by diffusion and the second one controlled by mass transfer. Further, studies were performed in order to determine the optimum pH value needed to obtain maximum adsorption capacity, but also to determine which are the adsorbed species. From pH and desorption studies, it was proven that molybdate adsorption is a physical process. In order to establish the adsorption mechanism, the thermodynamic parameters (ΔG0, ΔH0 and ΔS0) were determined.

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Highly-efficient separation and recovery of ruthenium from electroplating wastewater by a mesoporous silica-polymer based adsorbent

Cited by 44 publications

References 51 publications

Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal

Silica- Iron Oxide Nanocomposite Enhanced with Porogen Agent Used for Arsenic Removal

Indium Recovery by Adsorption on MgFe2O4 Adsorbents

Molybdate Recovery by Adsorption onto Silica Matrix and Iron Oxide Based Composites

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