Adsorption of silica nanoparticles onto calcite: Equilibrium, kinetic, thermodynamic and DLVO analysis

Monfared, Abolfazl Dehghan; Ghazanfari, Mohammad Hossein; Jamialahmadi, M.; Helalizadeh, Abbas

doi:10.1016/j.cej.2015.06.104

Cited by 119 publications

(69 citation statements)

References 63 publications

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“…However, some of the NPs may have been agglomerated during handling. In general, NPs are shown to be spread on the chalk surface in a similar way to the observations made by Monafred, et al [34]. No pore throat blockage was observed from SEM imaging.…”

Section: Isothermal Static Adsorptionsupporting

confidence: 70%

“…At higher NP concentrations, however, adsorption in SSW and DIW was almost the same. Monafred, et al [34] have reported an increase in adsorption of unmodified silica NPs on a calcite surface with increasing salinity (0-0.2 M) of single salt (NaCl) brine at low NP concentrations (0.4 and 0.6 g/L).…”

Section: Isothermal Static Adsorptionmentioning

confidence: 99%

“…Apart from wettability change, silica NPs have also been shown to reduce oil-water interfacial tension thereby improving the mobility of oil phase [27][28][29] and stabilize oil in water emulsions [30][31][32][33] for EOR application. Monfared, et al [34] studied the adsorption of silica NPs on calcite surfaces. They reported that salinity has a positive effect on the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Silica Nanoparticles on Fluid/Rock Interactions during Low Salinity Water Flooding of Chalk Reservoirs

2018

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Abstract:The main objective of this work is to address the adsorption of Silica nanoparticles (NPs) dispersed in different brines on chalk surfaces and their effect on fluid/rock interaction. Isothermal static and dynamic adsorption on chalk are addressed here. Isothermal static adsorption showed increased adsorption of NPs at higher salinity. The tests were performed to cover wide range of injection scenarios with synthetic seawater (SSW) and low salinity water (LSW). The selected LSW composition here is based on 1:10 diluted SSW, which has shown to have superior performance compared to other ion compositions. The dynamic adsorption tests of NPs showed reduction of calcite dissolution of about 30% compared to LSW alone. That is, silica nanofluid hinders calcite dissolution i.e., has less effect on chalk matrix integrity which is a major concern in chalk reservoir, if low salinity is employed for enhanced oil recovery. Both scanning electron microscope images and pressure drop across the core during nanofluid injection indicated no throat blockage. Based on ion tracking and the monitored pH, the mechanism(s) for NP adsorption/desorption are suggested. The results from this study suggests a synergy wherein adding relatively small amount of silica NPs can improve the performance of low salinity floods.

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Section: Isothermal Static Adsorptionsupporting

confidence: 70%

Section: Isothermal Static Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Silica Nanoparticles on Fluid/Rock Interactions during Low Salinity Water Flooding of Chalk Reservoirs

2018

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“…The mechanisms of the adsorption process can be described as follows 12,15 : (1) solute diffuses through the liquid film surrounding the particle (film diffusion control), (2) solute diffuses through the polymeric matrix of the resin (particle diffusion control); (3) chemical reaction. The step offering greater resistance than the others is considered the rate-controlling step.…”

Section: Kineticsmentioning

confidence: 99%

“…Specifically, 0.5 g of dry resin was mixed with aqueous solutions of D-GA with different initial concentrations and at varying pH values (8)(9)(10)(11)(12). The D-GA content in each aqueous solution was then quantified by HPLC.…”

Section: Equilibrium Experimentsmentioning

confidence: 99%

Combined Adsorption and Ion Exchange of D-Glyceric Acid Using a Strong Basic Resin: Equilibrium, Kinetics, and Thermodynamics

Wang

Xie

et al. 2018

Chem.Biochem.Eng.Q.

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D-Glyceric acid (D-GA) is a glycerol derivative with various promising biological functions. This paper reports the adsorption of D-GA from aqueous solution using a strong basic resin. The effect of pH on the uptake of D-GA was studied, and several models were used to investigate the interactions of D-GA and the resin. A theoretical model based on ion exchange and adsorption was developed to fit the isotherms under various pH or temperatures. Kinetic experiments under different initial D-GA concentrations were also performed to define the controlling mechanism of the overall adsorption process. The results showed that the uptake process of D-GA was controlled by the rate of D-GA diffusion through the polymeric matrix of the resin. This study provides valuable information and theoretical support for the scale-up and optimization of operating conditions for the recovery of D-GA.

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A new empirical scaling equation for accurate prediction of gaseous species equilibrium adsorption on activated carbon

Erfani

Joonaki

2018

Asia-Pacific J Chem Eng

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Adsorption models have many applications in industry such as in gas separation and/purification, natural gas storage, and CO 2 capture. In this work, a simple and robust method is introduced for calculation of natural gas and biogas adsorption on activated carbon, which is not only less complex than existing models but also not limited to isothermal condition. The proposed equation collapses the experimental data at different temperatures into a single linear curve, from which the adsorbed amounts at equilibrium can be calculated for any desired pressure and temperature in the range of experimental data. Model parameters are also calculated and presented for different gas components on activated carbon, and the accuracy of the proposed model is compared with that of three most common adsorption isotherms. As a result, the proposed scaling equation approach is shown to be more accurate and robust than the Langmuir and Sips models. Also, although application of these models is limited to isothermal condition, the proposed model is temperature dependent. It is shown that the proposed model predicts the experimental data with less than 4% error in term of sum of squared errors, and with correlation factors (R 2 ) higher than 0.95, which demonstrate the applicability of the developed approach. Proposed scaling equation scheme could help adsorption-based process design and separation or purification of mainly CH 4 from natural gas and/or biogas streams with distinct CO 2 -based contents along with a decrease in necessity of experimental data to address these purposes. KEYWORDS activated carbon, adsorption, adsorption isotherm, biogasNomenclature: A 1 , proposed model constants (g/g adsorbent/bar); A 2 , proposed model constants (g/g adsorbent); ANG, adsorbed natural gas; b, b 0 , Sips/Toth models constants (1/bar); CNG, compressed natural gas; CSS, CO 2 capture and sequestration; K L , Langmuir model constant (1/bar); LNG, liquefied natural gas; N, number of data; n, n 0 , Sips model constants; NG, natural gas; n P , proposed model constant, pressure exponent; n T , proposed model constant, pseudoreduced temperature exponent; P, pressure (bar); q eq , equilibrium adsorption per unit mass of adsorbent (g/g adsorbent); q m , Langmuir model constant, maximum uptake capacity of gas at the adsorbent surface (g/g); q s , Sips/Toth models constant (g/g); Q RT 0 , heat coefficient;R 2 , correlation factor; RMSE, root mean square error; SSE, sum of squared error of prediction; t, Toth model constant; T, temperature (K); T c , critical temperature (K); y i , original data value; b y i , modeled data value; y i , original data mean value; Y, X, proposed model variables Greek Letters: α, Sips/Toth model constant

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Adsorption of silica nanoparticles onto calcite: Equilibrium, kinetic, thermodynamic and DLVO analysis

Cited by 119 publications

References 63 publications

Effect of Silica Nanoparticles on Fluid/Rock Interactions during Low Salinity Water Flooding of Chalk Reservoirs

Effect of Silica Nanoparticles on Fluid/Rock Interactions during Low Salinity Water Flooding of Chalk Reservoirs

Combined Adsorption and Ion Exchange of D-Glyceric Acid Using a Strong Basic Resin: Equilibrium, Kinetics, and Thermodynamics

A new empirical scaling equation for accurate prediction of gaseous species equilibrium adsorption on activated carbon

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