Carbon–Silica Composites from Sago Waste for the Removal of Chromium, Lead, and Copper from Aqueous Solution: Kinetic and Equilibrium Isotherm Studies

Ngaini, Zainab; Rajan, Y.; Wahi, Rafeah

doi:10.1007/s11270-021-05393-9

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…The adsorption amount rose again as the surfactant concentration further increased. The models of Langmuir (Equation ()) and Freundlich (Equation ()) in this study fit the adsorption isotherm of surfactants on the sandstone surface (Ngaini et al, 2021).

\frac{C_{e}}{Q_{e}} = \frac{C_{e}}{Q_{m}} + \frac{1}{Q_{m} K_{L}},

\ln Q_{e} = \ln K_{F} + \frac{1}{n} \ln C_{e},

where

Q_{e}

(mg/g) is the equilibrium adsorption amount;

Q_{m}

(mg/g) is the maximum monolayer adsorption amount;

C_{e}

(mg/L) is the equilibrium concentration;

K_{L}

(L/mg) is the Langmuir adsorption constant;

K_{F}

(mg/g) and n are the Freundlich constants.…”

Section: Resultsmentioning

confidence: 91%

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Wettability alteration and reducing water blockage in tight gas sandstone reservoirs using mixed cationic Gemini/nonionic fluorosurfactant mixtures

2022

J Surfact & Detergents

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The unrecovered hydraulic fracturing fluid will invade the matrix and induce water blockage, creating formation damage and hindering the oil or gas production rate. First, the synergistic effect of cationic Gemini surfactant (MQAS) and nonionic fluorosurfactant (N-2821) mixtures on reducing the surface tension and wettability alteration was investigated in this paper. The critical micelle concentration (CMC) of the surfactant mixture is one or two orders of magnitude lower than that of N-2821 and MQAS, indicating that the MQAS/N-2821 mixtures exhibit an apparent synergistic effect in reducing surface tension. Moreover, the maximal contact angle of MQAS/N-2821 mixtures reached 83.55 at α N-2821 = 0.5, and the total surfactant concentration of 1 Â 10 À4 mol/L due to the adsorption of surfactant. The adsorption mechanism of surfactants on the surface of quartz sand was then examined. The adsorption kinetics is consistent with the pseudo-second-order model at different surfactant concentrations, while the Freundlich model is suitable for describing the adsorption behavior of surfactants on the sandstone surface. This finding indicates that surfactant adsorption is multilayered. The MQAS/N-2821 surfactant mixtures have excellent surfactant activity due to the relationship of the capillary pressure to the surface tension, pore radius, and contact angle; thus, the addition of surfactant mixtures can reduce the liquid saturation effectively. Furthermore, the sequential imbibition experiments indicate that MQAS/N-2821 mixtures alter the wettability of the core plug, which results from the adsorption of surfactants. Compared with brine water, the MQAS/N-2821 mixtures decreased the liquid saturation and increased the permeability recovery ratios of the core plug.

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\frac{C_{e}}{Q_{e}} = \frac{C_{e}}{Q_{m}} + \frac{1}{Q_{m} K_{L}},

\ln Q_{e} = \ln K_{F} + \frac{1}{n} \ln C_{e},

where

Q_{e}

(mg/g) is the equilibrium adsorption amount;

Q_{m}

(mg/g) is the maximum monolayer adsorption amount;

C_{e}

(mg/L) is the equilibrium concentration;

K_{L}

(L/mg) is the Langmuir adsorption constant;

K_{F}

(mg/g) and n are the Freundlich constants.…”

Section: Resultsmentioning

confidence: 91%

“…The adsorption amount rose again as the surfactant concentration further increased. The models of Langmuir (Equation ( 4)) and Freundlich (Equation ( 5)) in this study fit the adsorption isotherm of surfactants on the sandstone surface (Ngaini et al, 2021).…”

Section: Adsorption Thermodynamicsmentioning

confidence: 90%

Wettability alteration and reducing water blockage in tight gas sandstone reservoirs using mixed cationic Gemini/nonionic fluorosurfactant mixtures

2022

J Surfact & Detergents

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Bio-based activated carbon for Cu(II), Ni(II), and Pb(II) ions aqueous sequestration: physiochemical characterization, isotherms, and kinetics

Imran-Shaukat,

Wahi,

Ngaini

2024

Int. J. Environ. Sci. Technol.

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Carbon–Silica Composites from Sago Waste for the Removal of Chromium, Lead, and Copper from Aqueous Solution: Kinetic and Equilibrium Isotherm Studies

Abstract: demonstrated the occurrence of chemisorption process between the composite and metal ions. The composite from carbon-silica is one of the cost-effective natural sorbents which demonstrate excellent removal of heavy metal from the aqueous environment.

Cited by 2 publications

References 25 publications

Wettability alteration and reducing water blockage in tight gas sandstone reservoirs using mixed cationic Gemini/nonionic fluorosurfactant mixtures

Wettability alteration and reducing water blockage in tight gas sandstone reservoirs using mixed cationic Gemini/nonionic fluorosurfactant mixtures

Bio-based activated carbon for Cu(II), Ni(II), and Pb(II) ions aqueous sequestration: physiochemical characterization, isotherms, and kinetics

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