Native and Magnetic Oxide Nanoparticles (Fe3O4) Impregnated Bentonite Clays as Economic Adsorbents for Cr(III) Removal

Shah, Khizar Hussain; Ali, Shahid; Waseem, Muhammad; Shah, Faheem; Fahad, Muhammad; Shahida, Shabnam; Khan, Asad Muhammad; Khan, Abdur Rahman

doi:10.1007/s10953-019-00912-z

Cited by 14 publications

(6 citation statements)

References 42 publications

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“…e dwarf peak for BMNC at 2361 cm −1 was attributed to the C-O-H bond. is may be due to the catalytic absorption of CO 2 during the coprecipitation synthesis of the BMNC [45]. Another peak that occurred at 655 cm −1 is assigned to Fe-O stretching and is proof of magnetite nanoparticles in BMNC [46].…”

Section: Ftir Analysismentioning

confidence: 84%

“…As shown in Figure 8, the adsorbent dose is increased from 0.5 to 1.5 g/L, and the removal efficiency was increased rapidly from 70 to 81% for the BNa and from 84 to 98% for the BMNC. ese results are because under constant metal ion concentrations, increasing the adsorbent dose increases the adsorption rate due to the increased available number of active sites in the adsorbent [3,45]. e Cr(VI) removal efficiency levels off beyond the 1.5 g/L dose for both adsorbents.…”

Section: Individual Parameter Effects On Adsorption Processmentioning

confidence: 99%

“…Presence of strong oxidants or in alkaline conditions, the Cr(III) gets easily oxidized into harmful Cr(VI) in soil or water. Cr(VI) ion can cause critical problems like inhibition of plant growth, genetic mutation, diarrhoea, nose ulcers, running nose, cough, breathing difficulty, asthma, kidney and liver failure, and cancer [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…e challenges to natural and modified bentonite are the difficulty in separation of the adsorbent from the solution after the adsorption process. It involves very special techniques to separate the adsorbent from the solution due to the clay's low mechanical stability and high dispersion [13]. So, modification of the bentonite clay that enhances its absorptivity and filterability is the focus of this research.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Fe3O4-Bentonite Nanocomposite Adsorbent for Cr(VI) Removal from Water Solution

Adisu

Balakrishnan

Tibebe

2022

International Journal of Chemical Engineering

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Bentonite-magnetite nanocomposite adsorbent (BMNC) was made and investigated for its adsorption removal of Cr(VI) from an aqueous solution. This adsorbent was prepared by the coprecipitation method from sodium bentonite (BNa) with iron chloride solution at controlled pH and under an inert atmosphere. These adsorbents were characterized by atomic absorption spectrophotometer (AAS), Brunauer–Emmett–Teller (BET), dynamic light scattering (DLS), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) analyses. Particle size of BMNC was in the range of 15 to 95 nm as per DLS. The intercalation of magnetite nanoparticles onto the bentonite clay increased its specific surface area from 142 to 177 m2/g as per BET analysis. Experimental design optimization results in 96.5% of Cr(VI) removal from the water solution at optimized adsorption parameters viz., adsorption time of 101 min, pH of 1.95, adsorbent dose of 1.12 g/L, and initial Cr(VI) concentration of 36.2 mg/L. The results of these studies demonstrate that the BMNC performs well. Moreover, the adsorption of Cr(VI) onto the BMNC was found to be the best fit with Langmuir isotherm (R2 = 0.9984) and a maximum adsorption capacity of 98 mg/g. The kinetics of the adsorption process was found to be a pseudo-second-order model (R2 = 0.9912). The BMNC also showed favourable reusability for adsorbate Cr(VI) ions removal from the water solution.

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Section: Ftir Analysismentioning

confidence: 84%

Section: Individual Parameter Effects On Adsorption Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Fe3O4-Bentonite Nanocomposite Adsorbent for Cr(VI) Removal from Water Solution

Adisu

Balakrishnan

Tibebe

2022

International Journal of Chemical Engineering

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“…The percentage adsorption was calculated by using initial and the equilibrium concentrations. [ 42 ] The results are shown in figure 25. It is apparent that the maximum adsorption of dye occurred at pH of 2.5 for PW and at 1.0 for PC.…”

Section: Resultsmentioning

confidence: 99%

Equilibrium, kinetic and thermodynamic studies for the purification of wastewater from Congo red using simple and low cost adsorbents

Shakeel,

Khizar,

Atiq

et al. 2023

Vietnam Journal of Chemistry

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This manuscript reports the purification of wastewater from Congo red (CR) by adsorbing it on sawdust of Pinus walichiana (PW) and Populus ciliata (PC) used as adsorbents. The adsorbents were characterized by Field emission scanning electron microscopy (FESEM), Energy dispersive X‐rays (EDX) spectroscopy, X‐rays diffraction (XRD) and BET surface area and pore size analysis. Different adsorption models like Langmuir, Temkin, Freundlich and Dubinin‐Radushkevich (R‐D) were applied to the system. The adsorption of CR on sawdust of both plants followed Freundlich adsorption isotherm to greater extent than Langmuir and Temkin isotherms which means that the surface of adsorbents was mostly heterogeneous and there occurred adsorbate‐adsorbate interaction which influenced the adsorption process. The process also obeyed D‐R model and mean free energy of adsorption was calculated to be 7.11 kJ.mol‐1 showing that the process of adsorption was physical. Adsorption of CR on both adsorbents followed film diffusion, particle diffusion, pseudo first order and Elovich models. It means that the process of adsorption was mixed diffusional in nature, occurred through physical process, the sites for adsorption increased exponentially with adsorption and multimolecular layer was formed on the surface of adsorbents. ∆H was 3.77 kJ.mol‐1 and 15.92 kJ.mol‐1, ∆S was 19.49 kJ.mol‐1 and 85.91 kJ.mol‐1 while ∆G was (‐1.75 to ‐2.33) kJ.mol‐1 and (‐8.39 to 10.97) kJ.mol‐1 for PW and PC, respectively. It means that the adsorption process was endodermic, resulted in increase in entropy and spontaneous for both the adsorbents. Isoelectric point (IEP) was determined by salt addition method, and it was found to be 6.9 for sawdust of PW and 5.1 for PC. The process of adsorption was found to be higher in the low pH range for both the adsorbents.

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Adsorptive Mechanism of Chromium Adsorption on Siltstone–Nanomagnetite–Biochar Composite

Din

Khan

Hussain

et al. 2021

J Inorg Organomet Polym

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Native and Magnetic Oxide Nanoparticles (Fe3O4) Impregnated Bentonite Clays as Economic Adsorbents for Cr(III) Removal

Cited by 14 publications

References 42 publications

Synthesis and Characterization of Fe3O4-Bentonite Nanocomposite Adsorbent for Cr(VI) Removal from Water Solution

Synthesis and Characterization of Fe3O4-Bentonite Nanocomposite Adsorbent for Cr(VI) Removal from Water Solution

Equilibrium, kinetic and thermodynamic studies for the purification of wastewater from Congo red using simple and low cost adsorbents

Adsorptive Mechanism of Chromium Adsorption on Siltstone–Nanomagnetite–Biochar Composite

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