Influence of Alginate Encapsulation on Point of Zero Charge (pHpzc) and Thermodynamic Properties of the Natural and Fe(III) - Modified Zeolite

Kragović, Milan; Stojmenović, Marija; Petrović, Jelena; Loredo, Jorge; Pašalić, Snežana; Nedeljković, Andrijana; Ristović, Ivica

doi:10.1016/j.promfg.2019.02.216

Cited by 76 publications

(30 citation statements)

References 28 publications

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“…As shown in Figure 7, the shape is similar with an increase of pHf with the augmentation of NaCl pHi, with a plateau when the pHi is between 4 and 10 and with a new increase step after pHi 10. The same evolution was mentioned by Kragovic et al [62] who studied among others the influence of alginate encapsulation on the point of zero charge of several zeolites. In our case, the recorded results are 6.9 for SC-A-5%, 6.6 for SP-A-5%, 6.9 for SPRMB-A-5% and 6.8 for SPRBM-A-9%, 8.3 for SC-C-2.5% and 8.8 for SP-C-2.5%.…”

Section: Biosorbents' Phpzcsupporting

confidence: 65%

“…As shown in Figure 7, the shape is similar with an increase of pH f with the augmentation of NaCl pH i , with a plateau when the pH i is between 4 and 10 and with a new increase step after pH i 10. The same evolution was mentioned by Kragovic et al [62] who studied among others the influence of alginate encapsulation on the point of zero charge of several zeolites. charge is null, i.e., the charge of the positive surface sites is the same as that of the negative ones, was determined with the drift method with sodium chloride as electrolyte.…”

Section: Biosorbents' Ph Pzcsupporting

confidence: 65%

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Eco-Friendly Biosorbents Based on Microbial Biomass and Natural Polymers: Synthesis, Characterization and Application for the Removal of Drugs and Dyes from Aqueous Solutions

et al. 2021

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Pharmaceuticals and dyes are a very important part of the nonbiodegradable or hard biodegradable substances present in wastewater. Microorganisms are already known to be effective biosorbents, but the use of free microbial cells involves difficulties in their separation from effluents and limits their application in wastewater treatment. Thus, this study aimed to develop biosorbents by immobilizing Saccharomyces cerevisiae, Saccharomyces pastorianus and Saccharomyces pastorianus residual biomass on natural polymers (alginate and chitosan) and to evaluate the biosorptive potential for removal of pharmaceuticals and dyes from water. Six types of biosorbents were synthesized and characterized by Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy techniques and their biosorptive capacities for three drugs (cephalexin, rifampicin, ethacridine lactate) and two dyes (orange II and indigo carmine) were evaluated. The obtained results show that the removal efficiency depends on the polymer type used for the immobilization. In case of alginate the removal efficiency is between 40.05% and 96.41% for drugs and between 27.83% and 58.29% for dyes, while in the case of chitosan it is between 40.83% and 77.92% for drugs and between 17.17% and 44.77% for dyes. In general, the synthesized biosorbents proved to be promising for the removal of drugs and dyes from aqueous solutions.

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Section: Biosorbents' Phpzcsupporting

confidence: 65%

“…As shown in Figure 7, the shape is similar with an increase of pH f with the augmentation of NaCl pH i , with a plateau when the pH i is between 4 and 10 and with a new increase step after pH i 10. The same evolution was mentioned by Kragovic et al [62] who studied among others the influence of alginate encapsulation on the point of zero charge of several zeolites. charge is null, i.e., the charge of the positive surface sites is the same as that of the negative ones, was determined with the drift method with sodium chloride as electrolyte.…”

Section: Biosorbents' Ph Pzcsupporting

confidence: 65%

Eco-Friendly Biosorbents Based on Microbial Biomass and Natural Polymers: Synthesis, Characterization and Application for the Removal of Drugs and Dyes from Aqueous Solutions

et al. 2021

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“…This may be explained as zeolite samples dominated alkalinity and ion exchange reaction between the Na ions in the zeolite and Ca 2+ ions in the solution, which could increase the pH value readily at acidic pH [60].…”

Section: Effect Of Phmentioning

confidence: 99%

“…The regenerated zeolites after 4 hours, showed an increase in the adsorption efficiency by up to 40 %. This may be due to the magnitude of the ion-exchange ability of sodium ions to replace calcium ions inside the zeolite samples when using the NaCl solution [60]. According to the rules of cation exchange capacity (CEC) on zeolite previously published [13], all aluminous zeolite prefer trading NH4 + and/or Na + ions from solution.…”

Section: Cycles and Regeneration Of Exhausted Zeolitementioning

confidence: 99%

Facile and affordable synthetic route of nano powder zeolite and its application in fast softening of water hardness

El-Nahas

Osman

Arafat³

et al. 2020

Journal of Water Process Engineering

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Herein, we proposed an affordable and facile way of treating the hardening of water from local groundwater and seawater sources. This was facilitated by synthesizing zeolitic materials via an effortless and affordable method from readily available disposed of waste materials. Firstly, by converting waste aluminium (scrap wire cables, takeaway foil, cans, and spray aerosol bottles) along with disposed of silica gel into active zeolitic materials with the aid of a conventional domestic microwave. Small amounts of the produced zeolites (NaX and NaA) were utilized in the removal of the hardness of water (10 g.L-1), showing elimination of Ca 2+ and Mg 2+ ions within 30 minutes, removing 90% of the total hardness (> 1000 ppm). The spent zeolite samples can be further used for more than two consequent cycles, then the regeneration can be promoted by using NaCl solution at ambient conditions. The total price for the synthesis of 1 kg of the zeolite produced herein is 14 $/kg. This is 70% lower than the price of commercial zeolites available in the market. Our proposed facile route in zeolite preparation could potentially change the traditional costly softening treatment techniques. It also minimizes the use of extra chemical materials, templates and multistep procedures. The excellent hardness removal capacity in groundwater and seawater using synthesized zeolite samples could open doors for various applications.

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“…pH pzc refers to the situation at which the protonic charge on the surface of adsorbent equals to anionic charge of aqueous solution, resulting in net zero charge on adsorbent's surface. This surface charge becomes negative and positive under the conditions of pH>pH pzc and pH<pH pzc respectively [31]. Therefore, the solution pH<pH pzc , the adsorbents surface becomes positively charged due to tendency of high H + ions.…”

Section: Ph and Phpzc Determinationmentioning

confidence: 99%

Tobacco Stalk Waste Biomass Holds Multilayer and Spontaneous Adsorption Capabilities for Reactive Black 5 Dye: Equilibrium Modelling and Error Function Analysis

Shah¹,

Mirza²,

Butt³

et al. 2021

Pol. J. Environ. Stud.

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Tobacco stalk biomass (TSB) is explored for reactive black 5 (RB5) dye treatment in batch reactor. TSB displayed RB5 adsorption efficiency of 93.5% at 120 min. The RB5 data were fitted to linear and non-linear isotherms and kinetic models. Error functions were determined to have a holistic view on optimum parameters and to validate prediction of models. Harkin-Jura exhibited better fit than that of Freundlich and Langmuir isotherms suggesting multilayer adsorption of RB5 onto TSB on the basis of R 2 and chi-square (χ 2 ) error values. Adsorption kinetics was best explained by intraparticle diffusion model (IPD) at increasing initial concentration of RB5. Among the error functions evaluated, the χ 2 values for the IPD model were found to be smaller than those for PSO. This suggests that kinetics of RB5 dye is better controlled by IPD phenomenon. Fourier transform infrared spectroscopy confirms the physical adherence of dye to the adsorbent. Values of Gibbs free energy were found to be -19.55 -21.41, -23.40 and -25.33 kJ/mol which shows spontaneous adsorption. Moreover, it is found that TSB adsorbent could be utilized as the effective and economically viable adsorbent for RB5 dye from aqueous solution.

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Influence of Alginate Encapsulation on Point of Zero Charge (pHpzc) and Thermodynamic Properties of the Natural and Fe(III) - Modified Zeolite

Cited by 76 publications

References 28 publications

Eco-Friendly Biosorbents Based on Microbial Biomass and Natural Polymers: Synthesis, Characterization and Application for the Removal of Drugs and Dyes from Aqueous Solutions

Eco-Friendly Biosorbents Based on Microbial Biomass and Natural Polymers: Synthesis, Characterization and Application for the Removal of Drugs and Dyes from Aqueous Solutions

Facile and affordable synthetic route of nano powder zeolite and its application in fast softening of water hardness

Tobacco Stalk Waste Biomass Holds Multilayer and Spontaneous Adsorption Capabilities for Reactive Black 5 Dye: Equilibrium Modelling and Error Function Analysis

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