Modification of Langmuir model for simulating initial pH and temperature effects on sorption process

Naji, Laith A.; Jassam, Salim H.; Yaseen, Mohammed Jawad; Faisal, Ayad A.H.; Al‐Ansari, Nadhir

doi:10.1080/01496395.2019.1655055

Cited by 38 publications

(22 citation statements)

References 28 publications

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“…. Batch experiments were conducted using a solution with initial pH ranging between 3 and 7.5, because higher pH values can result in precipitation of cadmium [35]. The initial pH of the prepared samples was controlled using the required volumes of 0.1 M HNO3 or NaOH.…”

Section: Characterization Of the Coated Chicken Bone Particles Using mentioning

confidence: 99%

Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Alquzweeni

Alkizwini

2020

Water

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Occurrence of heavy metals in freshwater sources is a grave concern due to their severe impacts on public health and aquatic life. Cadmium (Cd2+) is one of the most dangerous heavy metals, and can cause serious diseases even at low concentrations. Hence, a wide range of treatment technologies exist, such as nanofiltration and biological reactors. In this context, the present investigation aims at the development of a new adsorption medium, made from chicken bones coated with iron (Fe) and magnesium (Mg) hydroxides, to remove cadmium from water. This novel chicken bone functional substance was manufactured by applying layered double hydroxides (LDH) into the chicken bones. Initially, the new adsorption medium was characterized using Fourier-transform infrared spectroscopy (FTIR technology), then it was applied to remove cadmium from water under different conditions, including pH of water (3–7.5), agitation speed (50–200 rpm), adsorbent dose (1–20 g per 100 mL), and contact time (30–120 min). Additionally, the reaction kinetics were studied using a pseudo-first order kinetic model. The results obtained from the present study proved that the new adsorption medium removed 97% of cadmium after 120 min at an agitation speed of 150 rpm, pH of 5, and adsorption dose of 10 g per 100 mL. The results also showed that the new adsorption medium contains a significant number of functional groups, including hydroxyl groups. According to the outcomes of the kinetic study, the mechanism of removing metal is attributed to surface precipitation, ion exchange, complexation, hydrogen binding between pollutants, and the LDH-chicken bone substance.

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Section: Characterization Of the Coated Chicken Bone Particles Using mentioning

confidence: 99%

Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Alquzweeni

Alkizwini

2020

Water

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“…The batch experiments were conducted with different operational conditions; specifically, initial pH of (3, 4, 5, 6 and 7), initial concentration of (300, 400, 500, 600 and 700 mg/L), sorbent dosage of (0.1, 0.3, 0.5, 0.7, 1.0 g/100 mL) and agitation speed of (0, 50, 100, 150, 200 and 250 rpm). Also, the effects of temperature variation on the sorption performance were investigated at 20, 30 and 40 • C. The quantity of benzaldehyde sorbed onto the sorbent (q e ) was calculated by the following Equation [22]:…”

Section: Batch Experimentsmentioning

confidence: 99%

“…where 1/n (<1) is the sorption intensity, and K F is reflected the maximum adsorption capacity of the sorbent [22,28].…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

“…Langmuir model (1918): this is valid for adsorption of single-layer; however, this model was derived based on the number of assumptions; specifically, the saturation state of all binding sites with molecules of contaminant is equivalent to the maximum adsorption capacity (q max ), the energy of adsorption must be constant, and no transmigration of contaminant within the plane of the solid surface. Langmuir suggested the formula [22,29] below: q e = q max bC e 1 + bC e (7) where b is the slope of Langmuir relationship and; physically, it means the affinity between the contaminant and the sorbent.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

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Predominant Mechanisms in the Treatment of Wastewater Due to Interaction of Benzaldehyde and Iron Slag Byproduct

Faisal

Alquzweeni

Naji

et al. 2019

IJERPH

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Iron slag is a byproduct generated in huge quantities from recycled remnants of iron and steel factories; therefore, the possibility of using this waste in the removal of benzaldehyde from contaminated water offers an excellent topic in sustainability field. Results reveal that the removal efficiency was equal to 85% for the interaction of slag and water contaminated with benzaldehyde at the best operational conditions of 0.3 g/100 mL, 6, 180 min, and 250 rpm for the sorbent dosage, initial pH, agitation time, and speed, respectively with 300 mg/L initial concentration. The maximum uptake capacity of iron slag was 118.25 mg/g which was calculated by the Langmuir model. Physical sorption may be the major mechanism for the removal of benzaldehyde onto iron slag based on the analysis of isotherm and kinetic sorption data and thermodynamically, the process was spontaneous and endothermic. Finally, the X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM) and energy-dispersive spectroscope (EDS) tests for reactive material certified that the dissolution of calcium oxide can enhance the removal of benzaldehyde by the formation of bridge cations.

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“…from anthropogenic industries, such as Petrochemicals, mining activities, batteries, pulp, paper, alloys, steel, pigment paint and fertilizer [4] [5]. Most techniques can be employed to remove toxic contaminates from synthetic wastewater such as solvent extraction, bio sorption, chemical precipitation, coagulation [5], ion-exchange, adsorption [6], Electrolysis [7], membrane filtration [8], adsorption [9,10] etc.…”

Section: -Introductionmentioning

confidence: 99%

Process Optimization Study of Pb(II) Removal by Bulk Liquid Membrane (BLM)

Yousif¹,

Flayeh²

2020

IJCPE

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Box-Wilson experimental design method was employed to optimized lead ions removal efficiency by bulk liquid membrane (BLM) method. The optimization procedure was primarily based on four impartial relevant parameters: pH of feed phase (4-6), pH of stripping phase (9-11), carrier concentration TBP (5-10) %, and initial metal concentration (60-120 ppm). maximum recovery efficiency of lead ions is 83.852% was virtually done following thirty one-of-a-kind experimental runs, as exact through 24-Central Composite Design (CCD). The best values for the aforementioned four parameters, corresponding to the most restoration efficiency were: 5, 10, 7.5% (v/v), and 90 mg/l, respectively. The obtained experimental data had been utilized to strengthen a semi-empirical model, based on a second-degree polynomial, to predict recovery efficiency. The model was tested using ANOVA software (Design expert®) and found acceptable R-Squared were (0.9673). Yield responseurface and contour plots have been created using the developed model, which revealed the presence of high-recovery plateaus whose specs will be useful in controlling pilot or industrial scale future devices to ensure economic feasibility.

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Modification of Langmuir model for simulating initial pH and temperature effects on sorption process

Cited by 38 publications

References 28 publications

Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Predominant Mechanisms in the Treatment of Wastewater Due to Interaction of Benzaldehyde and Iron Slag Byproduct

Process Optimization Study of Pb(II) Removal by Bulk Liquid Membrane (BLM)

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