Adsorption behavior of inorganic- and organic-modified kaolinite for Congo red dye from water, kinetic modeling, and equilibrium studies

Abukhadra, Mostafa R.; Sayed, Mohamed; Shahien, Mohamed G.; Ahmed, Zeinab

doi:10.1007/s10971-018-4719-6

Cited by 87 publications

(52 citation statements)

References 51 publications

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“…The correlation coefficient R 2 of Langmuir was 0.99, much higher than that of Freundlich isotherm, indicating better fit of experimental data with the Langmuir model. The preparation conditions and CR adsorption performance of various adsorbents were compared with the present work in Table 2 (Zhang et al, 2013;Srivastava and Sillanpää, 2016;Huang et al, 2017;Said et al, 2017;Shaba et al, 2017;Shaban et al, 2018). Compared with the traditional methods of clay adsorbents synthesis, present work can considerably shorten the reaction time.…”

Section: Adsorption Isothermsmentioning

confidence: 98%

Citric Acid Modified Bentonite for Congo Red Adsorption

et al. 2019

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Raw bentonite (RB) was chemically modified by citric acid (CA) to obtain a low-cost and environment-friendly citric acid incorporated bentonite (CAB) adsorbent, which was applied for the adsorptive removal of Congo Red (CR). The effect of adsorbent dosage, contact time, ionic strength, surfactant, and pH on adsorption was investigated. Adsorption equilibrium data fitted well with Langmuir model while the Langmuir adsorption capacity of CR on CAB reached up to 384 mg•g −1. Furthermore, CR adsorption on CAB followed pseudo-second kinetic model while intra-particle diffusion was not the only rate-limiting step as determined from intra-particle diffusion model investigation. RB and CAB were characterized by XRD, FT-IR, and BET techniques. A proposed mechanism for the adsorption of CR over CAB suggested the chemical adsorption phenomenon is mainly controlled by chelation, hydrogen bonding, and fixing.

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Section: Adsorption Isothermsmentioning

confidence: 98%

Citric Acid Modified Bentonite for Congo Red Adsorption

et al. 2019

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“…However, the adsorption capacity of raw kaolin is still insufficient for the removal of water pollutants below the recommended level. Hence, modification of kaolinite through intercalation of inorganic and organic compounds has brought additional adsorption efficiency (Duarte-Silva et al 2014;Zenasni et al 2014;Diab et al 2015;Shaban et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Preparation of cationic surfactant-modified kaolin for enhanced adsorption of hexavalent chromium from aqueous solution

Belachew

Hinsene

2019

Appl Water Sci

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In the current work, we have reported a cationic surfactant-modified Ethiopian kaolin for improved adsorption of Cr(VI) from aqueous solution. The raw kaolin was modified by treating with CTAB to enhance the adsorption properties. The crystal structure and vibrational analysis of CTAB-kaolin were investigated by Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (p-XRD) techniques. The successful modification of kaolin by CTAB through intercalation and coating was investigated by XRD and FTIR. p-XRD confirms the raw kaolin obtained from Belesa, Tigo kebele is kaolinite mineral. The study has also focused on the application of kaolin-CTAB for adsorption of hexavalent chromium. The percent removal of Cr(VI) was investigated at different parameters such as pH, contact time, concentration of Cr(VI) and adsorbent dosage. CTAB-kaolin shows 99% removal of Cr(VI) at the adsorption equilibrium (time = 180 min, 100 mg CTAB-kaolin, 10 ppm/100 ml). The Langmuir and Freundlich isotherm models were used to investigate the adsorption process of chromium onto kaolin-CTAB composites. The equilibrium data obeyed Langmuir model than Freundlich, which shows that the adsorption process proceeds through monolayer adsorption and maximum adsorption capacity was found to be Q o = 22.72 mg/g. The pseudo-second-order kinetics model is found to be well fitted than Pseudo-first-order kinetics, which implies that the adsorption mechanism more favors electrostatic interaction between chromium and kaolin-CTAB composites. In conclusion, CTAB-kaolin was found to be a promising adsorbent for the efficient removal of Cr(VI) from the aqueous solution.

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“…The Langmuir assumption suggested the adsorption of LVX as dissolved molecules on the surface of MgO/CaO NRs in a monolayer form by receptor sites distributed homogeneously on the surface of the synthetic nanorods 36 . The Freundlich assumption related to heterogeneous uptake of the LVX molecules in multilayer form 37 . The fitting results showed excellent correlation coefficient value with the Langmuir model as compared to the obtained value for the Freundlich model which was supported by the Chi-squared (χ 2 ) values (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Enhanced decontamination of levofloxacin as toxic pharmaceutical residuals from water using CaO/MgO nanorods as a promising adsorbent

Abukhadra

Basyouny

AlHammadi

et al. 2020

Sci Rep

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Novel MgO/CaO nanocomposite (MgO/CaO NRs) was synthesized by the hydrothermal method using diatomite porous frustules as a substrate under the microwave irradiation. The composite appeared as well crystalline rod-like nanoparticles with 52.3 nm as average particle size and 112.8 m2/g as BET surface area. The synthetic MgO/CaO NRs were addressed as a novel adsorbent for promising removal of levofloxacin (LVX) as pharmaceutical residuals. The adsorption studies revealed effective uptake of levofloxacin by MgO/CaO NRs with theoretical qmax of 106.7 mg/g and the equilibrium time of 720 min considering the best pH value (pH 7). The equilibrium studies highly fitted with the Langmuir model of monolayer adsorption considering the values of Chi-squared (χ2) and determination coefficient. The estimated adsorption energy from Dubinin–Radushkevich (0.2 kJ/mol) signifies physisorption mechanisms that might be coulombic attractive forces considering the kinetic studies. The thermodynamic addressing for the reactions verified their spontaneous and exothermic nature within a temperature range from 303 to 333 K. Additionally, the prepared MgO/CaO NRs show significant recyclability properties to be used in realistic remediation process and its uptake capacity is higher than several studied adsorbents in literature.

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Adsorption behavior of inorganic- and organic-modified kaolinite for Congo red dye from water, kinetic modeling, and equilibrium studies

Cited by 87 publications

References 51 publications

Citric Acid Modified Bentonite for Congo Red Adsorption

Citric Acid Modified Bentonite for Congo Red Adsorption

Preparation of cationic surfactant-modified kaolin for enhanced adsorption of hexavalent chromium from aqueous solution

Enhanced decontamination of levofloxacin as toxic pharmaceutical residuals from water using CaO/MgO nanorods as a promising adsorbent

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