Adsorption of anionic dye on eco-friendly synthesised reduced graphene oxide anchored with lanthanum aluminate: Isotherms, kinetics and statistical error analysis

Alrobei, Hussein; Prashanth, M.K.; Manjunatha, C; Kumar, C.B. Pradeep; Chitrabanu, C.P.; Shivaramu, Prasanna D.; Kumar, K. Yogesh; Raghu, M.S.

doi:10.1016/j.ceramint.2020.07.251

Cited by 96 publications

(49 citation statements)

References 34 publications

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“…The preliminary data analysis established that the PSO kinetic model is suitable for modeling the adsorption of BF onto MgO nanorods. This includes the entire adsorption process involving liquid film diffusion (LFDM), adsorption on the adsorbent surface, and intraparticle diffusion (IPDM) [ 49 , 50 ]. Due to the accelerated rate, the general adsorption response cannot be regarded as a controlling step in the adsorption process.…”

Section: Resultsmentioning

confidence: 99%

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Highly Selective Removal of Cationic Dyes from Wastewater by MgO Nanorods

et al. 2022

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The organic synthetic dyes employed in industries are carcinogenic and harmful. Dyes must be removed from wastewater to limit or eliminate their presence before dumping into the natural environment. The current study aims to investigate the use of MgO nanoparticles to eliminate basic fuchsine (BF), as a model cationic dye pollutant, from wastewater. The MgO nanorods were synthesized through a coprecipitation method. The obtained nanocomposite was characterized using various techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET), and FTIR spectroscopy. It was found that the variation of dye concentration and pH influenced the removal of BF by MgO. The adsorption capacity of 493.90 mg/g is achieved under optimum operating conditions (pH = 11, contact time = 236 min, and initial BF concentration = 200 ppm). Pseudo-second-order adsorption kinetics and Freundlich isotherm models best fitted BF sorption onto MgO nanorods. The BF sorption mechanism is associated with the electrostatic attractions and hydrogen bond between the O–H group of MgO and the NH2 groups of BF, as indicated by the pH, isotherms, and FTIR studies. The reusability study indicates that MgO was effectively used to eliminate BF in at least four continuous cycles. The investigation of MgO with different dyes suggests the high adsorption selectivity of BF, crystal violet (CV), and malachite green (MG) dyes compared with methyl orange (MO) dye. Overall, MgO nanorods can act as a potential and promising adsorbent for the efficient and rapid removal of cationic dyes (CV, MG, and BF) from wastewater.

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Section: Resultsmentioning

confidence: 99%

“…The BF sorption on MgO appeared to be controlled by the IPDM, as determined by the R 2 values, and three linear segments can be seen when piecewise linear regression is used. In addition, the IPDM fitting curve did not pass through the origin point, implying that the primary rate-controlling mechanism is intraparticle diffusion [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Removal of Cationic Dyes from Wastewater by MgO Nanorods

et al. 2022

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“…The possibility of a monolayer sorption for CFXN and MLG using the CNPs was inspected with the Langmuir isotherm (LI) model (Equation (10)). Additionally, the multilayer adsorption of CFXN and MLG using CNPs was examined via the Freundlich isotherm (FI) model (Equation (11)) [ 55 , 56 , 57 ].

where K L (L mg −1 ) and K F (L mg −1 ) are the LI and FI constants; q m (mg g −1 ) is the possibly maximum q t ; C e (mg L −1 ) is the equilibrium pollutant’s concentration; n is the Freundlich heterogeneity factor.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption of CFXN on the CNPs showed a better fitting to the LI model, while the MLG adsorption followed the FI model. Although the 1/n values indicated favorable adsorption for both pollutants, the 1/n value for CFXN was double that of the MLG, indicating that CFXN sorption had less preference for the FI model [ 57 ]. Additionally, the 1/n values for CFXN and MLG on CNPs indicated reversible adsorption, which may imply a physisorption nature.…”

Section: Resultsmentioning

confidence: 99%

Optimization, Nature, and Mechanism Investigations for the Adsorption of Ciprofloxacin and Malachite Green onto Carbon Nanoparticles Derived from Low-Cost Precursor via a Green Route

et al. 2022

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The spread of organic pollutants in water spoils the environment, and among the best-known sorbents for removing organic compounds are carbonaceous materials. Sunflower seed waste (SFSW) was employed as a green and low-cost precursor to prepare carbon nanoparticles (CNPs) via pyrolysis, followed by a ball-milling process. The CNPs were treated with a nitric–sulfuric acid mixture (1:1) at 100 °C. The scanning electron microscopy (SEM) showed a particle size range of 38 to 45 nm, and the Brunauer–Emmett–Teller (BET) surface area was 162.9 m2 g−1. The elemental analysis was performed using energy-dispersive X-ray spectroscopy, and the functional groups on the CNPs were examined with Fourier transform infrared spectroscopy. Additionally, an X-ray diffractometer was employed to test the phase crystallinity of the prepared CNPs. The fabricated CNPs were used to adsorb ciprofloxacin (CFXN) and malachite green (MLG) from water. The experimentally obtained adsorption capacities for CFXN and MLG were 103.6 and 182.4 mg g−1, respectively. The kinetic investigation implied that the adsorption of both pollutants fitted the pseudo-first-order model, and the intraparticle diffusion step controlled the process. The equilibrium findings for CFXN and MLG sorption on the CNPs followed the Langmuir and the Fredulich isotherm models, respectively. It was concluded that both pollutants spontaneously adsorbed on the CNPs, with physisorption being the likely mechanism. Additionally, the FTIR analysis of the adsorbed CFXN showed the disappearance of some functional groups, suggesting a chemisorption contribution. The CNPs showed an excellent performance in removing CFXN and MLG from groundwater and seawater samples and possessed consistent efficiency during the recycle–reuse study. The application of CNPs to treat synthetically contaminated natural water samples indicated the complete remediation of polluted water using the ball-mill-fabricated CNPs.

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“… 70 In addition, 1/ n describes the adsorption intensity under the Freundlich model, and specifies the type of adsorption as favorable (0 < 1/ n < 1), unfavorable (1/ n > 1) and irreversible (1/ n = 1). 71 For the current context, 1/ n is between 0 and 1, which is favorable. This is a way of estimating the adsorption intensity or surface heterogeneity, which increases as the value moves towards zero.…”

Section: Resultsmentioning

confidence: 94%