Development of an adsorbent for the remediation of crude oil polluted water using stearic acid grafted coconut husk (Cocos nucifera) composite

Asadu, Christian O.; Ezema, Chuka; Elijah, Onu Chijioke; Ike, Innocent S.; Onoghwarite, Ohimor Evuensiri; Okwudili, Umeagukwu Emmanuel

doi:10.1016/j.apsadv.2021.100179

Cited by 30 publications

(34 citation statements)

References 48 publications

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“…The FTIR analysis of the clay sample used for bleaching crude palm oil helps to identify the minerals present in the clay and also the characteristic functional groups present during the adsorption of aromatic compounds [5]. The FTIR results of the raw and alkaline-activated Amansea clay samples were assigned according to the functional groups reported by [22][23][24][25][26]. The infrared spectra were obtained for the samples before and after the activation process with 5 M and 0.5 M of potassium hydroxide (KOH) and sodium hydroxide (NaOH) respectively at 100 oC for 2 hours in a wavenumber range of 4000 -650 cm −1 .…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 99%

Kinetic and Thermodynamic Studies of Crude Palm Oil Bleaching Using Amansea Clay

Nkeiruka

Elijah

Ositadimma

2023

AJACR

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The effectiveness of the bleaching of crude palm oil was carried out using alkaline-activated Amansea clay. The clay sample was sun-dried, ground, sieved and activated with sodium hydroxide (NaOH) and Potassium hydroxide (KOH). The raw and alkaline-activated clay (AAMC) samples were characterized using Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and X-ray fluorescence (XRF) analyses. The dosage, temperature and contact time of the process were varied to observe the efficiency of the bleaching process. The results of the characterization indicated that the raw and activated clays were kaolinite and the clay changed significantly after activation. The bleaching efficiency improved with an increase in temperature and an increase in the mass of the adsorbent. The highest bleaching efficiency of 83.2% was obtained. The pseudo-second-order model best described the adsorption process at 100 oC. The Temkin isotherm model best fitted the experimental data when compared to the other isotherm models because it gave the highest R2 values of >0.9 at all temperatures. The thermodynamics studies carried out from the experimental data indicated that the process was endothermic with an increase in randomness at the solid/liquid interface. The values of the enthalpy and entropy were evaluated as 6.193 KJ/mol and 173.50 J/mol respectively. The adsorption of crude palm oil became spontaneous at 363 and 373 K due to the negative values of Gibb’s free energy obtained at those temperatures. The experimental result indicates that 83.2% bleaching efficiency can be from bleaching crude palm oil with alkaline-activated Amansea clay.

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Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 99%

Kinetic and Thermodynamic Studies of Crude Palm Oil Bleaching Using Amansea Clay

Nkeiruka

Elijah

Ositadimma

2023

AJACR

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“…The FTIR spectra were obtained for NC and ANC was carried out at the wavenumber range of 650 -4000 cm −1 . The interpretation of the FTIR results of NC and ANC were carried out according to the reports by [18][19][20][21]. The FTIR results for NC and ANC are shown in Figs.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…Some of the functional groups that disappeared from the raw clay after activation were Alkenyl C=C stretch (1625.1), N-H bend (1569.2), methyl C-H bend (1453.7 and 1375.4) and O-H in-plane bend (1334.4) [18,19,21]. The dominant presence of kaolinite mineral was detected by the relative intensity of O-H stretching bands in the FTIR spectrum [22].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…The study of equilibrium adsorption isotherm is very important in the design of adsorption systems [18]. The fitness of the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models at varying temperatures were investigated and the evaluated constants and coefficient of correlation (R 2 ) were listed in Table 6.…”

Section: Equilibrium Isotherm Modelling Of Anc On Crude Palm Oil Blea...mentioning

confidence: 99%

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Clay Characterization and Bleaching of Crude Palm Oil Using Acid-Activated Nibo Clay

Nweke

Ajemba

2022

Bioremed Sci Technol Res

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Acid-activated Nibo clay was applied as an adsorbent in the bleaching of crude palm oil. The collected clay sample was activated with hydrochloric acid solution after it was sun-dried and ground. The raw (NC) and activated clay (ANC) samples were characterized using XRF, SEM, and FTIR analyses. The efficiency of the bleaching process was examined by varying the adsorbent dosage, temperature and the contact time. The results of XRF, SEM, and FTIR analyses on NC and ANC showed that the clays were kaolinites with significant changes after activation. The bleaching experiment showed that increase in temperature improved the efficiency of the process. The highest bleaching efficiency of 86% was observed. The pseudo-second-order model best described the adsorption process at 100 °C when compared to correlation coefficient values of the pseudo-first-order, Intra-particle diffusion and Elovich kinetic models. The Temkin isotherm model best fitted the experimental data than the Langmuir, Freundlich and Dubinin-Radushkevich models with R2 values of >0.9 at all temperatures. The enthalpy and entropy values were evaluated as 54,943.90 J/mol and 154.6321 J/mol respectively. The enthalpy and entropy values indicated that the adsorption process was endothermic and showed an increase in randomness at the solid/liquid interface. The negative values of the Gibb’s free energy at 363 and 373 K implied that beta carotene adsorption of crude palm oil at these temperatures was spontaneous and feasible. This experimental study showed that acid activated Nibo clay can be applied as an adsorbent for the bleaching of crude palm oil at higher temperatures.

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“…47 If the mean free energy of adsorption, E (kJ mol À1 ), is o8 kJ mol À1 , the adsorption is physisorption and if it is greater than 8 kJ mol À1 , the adsorption will be chemisorption in nature. 48,49 Therefore, the resulting E values revealed that the adsorption course was more chemical in nature.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

A silanized magnetic amino-functionalized carbon nanotube-based multi-ion imprinted polymer for the selective aqueous decontamination of heavy metal ions

et al. 2022

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Development of an adsorbent for the remediation of crude oil polluted water using stearic acid grafted coconut husk (Cocos nucifera) composite

Cited by 30 publications

References 48 publications

Kinetic and Thermodynamic Studies of Crude Palm Oil Bleaching Using Amansea Clay

Kinetic and Thermodynamic Studies of Crude Palm Oil Bleaching Using Amansea Clay

Clay Characterization and Bleaching of Crude Palm Oil Using Acid-Activated Nibo Clay

A silanized magnetic amino-functionalized carbon nanotube-based multi-ion imprinted polymer for the selective aqueous decontamination of heavy metal ions

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