Characteristics of the Properties of Absodan Plus Sorbent and Its Ability to Remove Phosphates and Chromates from Aqueous Solutions

Sočo, Eleonora; Domoń, Andżelika; Papciak, Dorota; Michel, Magdalena M.; Cieniek, Bogumił; Pająk, Dariusz

doi:10.3390/ma15103540

Cited by 5 publications

(6 citation statements)

References 66 publications

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“…The final phase is the establishment of an equilibrium. The unusual nature of the binding process may be caused by limiting factors, such as the specific structure of the adsorbent, the solution, and its ions [ 97 ].…”

Section: Resultsmentioning

confidence: 99%

“…In the studies conducted so far on the kinetics of reactive materials, the most frequently fitted kinetic model was the pseudo-second-order model proposed by Ho, which assumes that the rate-limiting step of the process most likely involves chemical interactions leading to the binding of metal ions or organic compounds on the adsorbent surface via the mechanism (among others) of ion exchange or complexation [ 25 ]. The tested sorbents showed the best fit in terms of phosphorus binding to this model via the value of the determination coefficient (R 2 ): diatomite (0.99), zeolite (0.97), hydrotalcite (0.98), activated alumina (0.99) [ 78 ], hydroxy-aluminum pillared bentonite (1.00), hydroxy-iron pillared bentonite (0.99), mixed hydroxy-iron–aluminum pillared bentonite (1.00) [ 98 ], akadama clay (0.99), acid-activated akadama clay (0.99) [ 47 ], thermally modified zeolite (0.99) [ 99 ], Absodan Plus ® (0.99) [ 97 ], and Tunisian activated clays (0.99) [ 31 ]. A special case was calcium-rich sepiolite, which was characterized by fitting both to the pseudo-first and pseudo-second order kinetics models, which may indicate chemical sorption with valence forces via sharing, i.e., electron exchange between the adsorbent and the adsorbate [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

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Removal of Phosphorus with the Use of Marl and Travertine and Their Thermally Modified Forms—Factors Affecting the Sorption Capacity of Materials and the Kinetics of the Sorption Process

et al. 2023

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The paper presents new reactive materials, namely marl and travertine, and their thermal modifications and the Polonite® material, analyzing their phosphorus removal from water and wastewater by sorption. Based on the experimental data, an analysis of the factors influencing the sorption capacity of the materials, such as the material dose, pH of the initial solution, process temperature, surface structure, and morphology, was performed. Adsorption isotherms and maximum sorption capacities were determined with the use of the Langmuir, Freundlich, Langmuir–Freundlich, Tóth, Radke–Praunitz, and Marczewski–Jaroniec models. The kinetics of the phosphorus sorption process of the tested materials were described using reversible and irreversible pseudo-first order, pseudo-second order, and mixed models. The natural materials were the most sensitive to changes in the process conditions, such as temperature and pH. The thermal treatment process stabilizes the marl and travertine towards materials with a more homogeneous surface in terms of energy and structure. The fitted models of the adsorption isotherms and kinetic models allowed for an indication of a possible phosphorus-binding mechanism, as well as the maximum amount of this element that can be retained on the materials’ surface under given conditions—raw marl (43.89 mg P/g), raw travertine (140.48 mg P/g), heated marl (80.44 mg P/g), heated travertine (282.34 mg P/g), and Polonite® (54.33 mg P/g).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Removal of Phosphorus with the Use of Marl and Travertine and Their Thermally Modified Forms—Factors Affecting the Sorption Capacity of Materials and the Kinetics of the Sorption Process

et al. 2023

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“…Freundlich: q e = K F C e 1/n (6) where q e (mg/g) is the equilibrium adsorption amount, K L (L/mg) is the Langmuir adsorption equilibrium constant, q max (mg/g) represents the maximum adsorption capacity, C e (mg/L) represents the P equilibrium concentration, K F (mg (1−1/n) L 1/n /g) represents the Freundlich adsorption constant representing the adsorption capacity of the adsorbent materials, and n represents an indication of linearity. The fitted adsorption isotherms of P onto the E-C adsorbent materials are shown in Figure 2.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Different biological, chemical, and physical techniques have been created and widely applied in previous studies to manage and treat the phosphorus (P) present in wastewater [5,6]. Among these methods, the adsorption method is the most attractive since it is economically feasible and simple in real application.…”

Section: Introductionmentioning

confidence: 99%

Efficient Adsorption Removal of Phosphate from Rural Domestic Sewage by Waste Eggshell-Modified Peanut Shell Biochar Adsorbent Materials

Xu,

Liu,

Chen

et al. 2023

Materials

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In order to promote the improvement of the rural living environment, the treatment of rural domestic sewage has attracted much attention in China. Meanwhile, the rural regions’ sewage discharge standards are becoming increasingly stringent. However, the standard compliance rate of total phosphorus (TP) is very low, and TP has become the main limiting pollutant for the water pollutants discharge standards of rural domestic sewage treatment facilities. In this study, waste eggshell (E) was employed as a calcium source, and waste peanut shell (C) was employed as a carbon source to prepare calcium-modified biochar adsorbent materials (E-C). The resulting E-C adsorbent materials demonstrated efficient phosphate (P) adsorption from aqueous solutions over the initial pH range of 6–9 and had adsorption selectivity. At an eggshell and peanut shell mass ratio of 1:1 and a pyrolysis temperature of 800 °C, the experimental maximum adsorption capacity was 191.1 mg/g. The pseudo second-order model and Langmuir model were best at describing the adsorption process. The dominant sorption mechanism for P is that Ca(OH)2 is loaded on biochar with P to form Ca5(PO4)3OH precipitate. E-C was found to be very effective for the treatment of rural domestic sewage. The removal rate of TP in rural domestic sewage was 91–95.9%. After adsorption treatment, the discharge of TP in rural sewage met the second-grade (TP < 3 mg/L) and even first-grade (TP < 2 mg/L). This study provides an experimental basis for efficient P removal by E-C adsorbent materials and suggests possible applications in rural domestic sewage.

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“…The maximum permissible concentration of chromium in drinking water recommended by the World Health Organization (WHO) is 0.05 ppm. Chromium-containing wastewater is treated using chemical precipitation and coagulation [ 2 , 3 ], electrocoagulation [ 4 , 5 ], electroreduction and membrane separation [ 6 ], ion exchange [ 7 ], and sorption methods [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Chromium-Modified Heterogeneous Bipolar Membrane: Structure, Characteristics, and Practical Application in Electrodialysis

Козадерова

2023

Membranes

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The modification of an MB-2 bipolar ion exchange membrane with chromium (III) hydroxide was carried out by a chemical method, namely, by the sequential treatment of the membrane with a solution of chromium (III) salt and alkali. Data on the morphology, phase, and chemical composition of the modified membrane were obtained using scanning electron microscopy and energy-dispersive analysis. In particular, it was shown that the modifier was distributed in a layer 30–50 microns thick at the boundary of the cation- and anion-exchange layers of the bipolar membrane. The electrochemical behavior of the modified membrane in the process of sodium sulfate conversion was studied by measurements of the following characteristics: the current efficiency of the acid and base, the energy consumption of the process, and the degree of contamination of the target products with salt ions. It was shown that the resulting membrane has an alkali and acid yield of 61% and 57%, respectively. This is higher than the same yields for the industrial unmodified MB-2 membrane (38% and 30%). The results of this study demonstrated that the modified samples allowed obtaining a higher yield of acid and base, reducing the content of salt ions in the target products and also reducing the electricity consumption for obtaining a unit of the target product. The concentration dependences of the electrical conductivity of the MK-40 heterogeneous ion-exchange membrane, which is a cation-exchange layer of MB-2, in sodium sulfate solutions before and after its modification with chromium (III) oxide were obtained. A decrease in the specific electrical conductivity of the membrane with the introduction of a modifier was established. A quantitative assessment of the influence of the modifier on the current flow, volume fraction, and spatial orientation of the conductive phases of MK-40 was carried out using an extended three-wire model for the description of the model parameters of ion-exchange materials. When a modifying additive was introduced into MK-40, the fraction of the current passing through the inner solution and the intergel phase decreased. This was due to the substitution of part of the free solution in the pore volume by the modifier. A variant of the practical application of electrodialysis with the chromium-modified bipolar ion-exchange membranes is recommended.

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Characteristics of the Properties of Absodan Plus Sorbent and Its Ability to Remove Phosphates and Chromates from Aqueous Solutions

Cited by 5 publications

References 66 publications

Removal of Phosphorus with the Use of Marl and Travertine and Their Thermally Modified Forms—Factors Affecting the Sorption Capacity of Materials and the Kinetics of the Sorption Process

Removal of Phosphorus with the Use of Marl and Travertine and Their Thermally Modified Forms—Factors Affecting the Sorption Capacity of Materials and the Kinetics of the Sorption Process

Efficient Adsorption Removal of Phosphate from Rural Domestic Sewage by Waste Eggshell-Modified Peanut Shell Biochar Adsorbent Materials

Chromium-Modified Heterogeneous Bipolar Membrane: Structure, Characteristics, and Practical Application in Electrodialysis

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