Modified dry bean pod waste (Phaseolus vulgaris) as a biosorbent for fluorescein removal from aqueous media: Batch and fixed bed studies

Sá, Igor Coreixas de; Oliveira, Paulo Murilo Castro de; Nossol, Edson; Borges, Pedro H.S.; Lepri, Fábio G.; Semaan, Felipe S.; Dornellas, Rafael M.; Pacheco, Wagner F.

doi:10.1016/j.jhazmat.2021.127723

Cited by 18 publications

(4 citation statements)

References 102 publications

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“…Once the equilibrium state is attained, there will not be any adsorption that will take place, because the active sites and the pores are already saturated by the dye molecules. After this period, the remaining active sites will be saturated by three diffusion mechanisms, namely, film, pore, and reactions, that will take place on its surface [36]. Using chemically altered Volvariella volvacea , the same general trend of outcome was obtained for the removal of RhB dye [37].…”

Section: Resultsmentioning

confidence: 99%

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Balji,

Kumar

2023

Adsorption Science & Technology

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Among the wide variety of dyes present in the environment, cationic dyes are more toxic and have complex structure. The adsorption process of rhodamine B dye was successfully carried out by sulphuric acid-treated inexpensive modified fly ash (MFA) adsorbent via batch experiments. The nature of the adsorbent was characterized by techniques, namely, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The maximum removal efficiency of RhB dye was found to be 99.78% by using 0.5 g of adsorbent dosage in 50 mg/L of dye concentration. The SEM images displayed the porous nature of the adsorbent where the EDS analysis displays the elemental compositions present in the adsorbent. XRD pattern shows the crystallinity nature of the adsorbent. Among the batch study parameters, effect of pH plays an important role in the adsorption process. The pH of 4 was found to be an ideal setting for the efficient removal of the dye RhB. The preferable elimination ability was found by keeping the dosage at 5 g/L, contact time 120 min, and dye concentration at 50 mg/L. Adsorption capacity was found to be 36.36 mg/g. This shows the ability of the MFA for the removal of wastewater contaminants. This adsorption process is well suited for the Freundlich isotherm, which displaces the process as a multilayer adsorption. Studies in kinetics and thermodynamics demonstrate that the process was well suited for its exothermic nature and pseudo-second-order. Thermal regeneration studies were carried out, and the adsorbent was effectively recycled and utilized up to four more times with minimal loses in its effectiveness. Therefore, from these obtained results, it is clear that the MFA is an effective adsorbent for the effective removal of dyes from wastewater.

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Section: Resultsmentioning

confidence: 99%

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Balji,

Kumar

2023

Adsorption Science & Technology

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“…3). The Langmuir and Freundlich models were employed to fit the adsorption isotherm, 37–40 and the fitting results were graphed in Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

Efficient and selective removal of Pb²⁺ from aqueous solution by using an O⁻ functionalized metal–organic framework

Jiang

Ding

et al. 2022

Dalton Trans.

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“…Organic fluorophores such as xanthene dyes have been widely used as fluorescent probes, laser dyes, nonlinear optics, biological probes, etc . Among the various xanthene dyes, water-soluble fluorescein (abbreviated as FL) is a very essential nontoxic dye that shows high sensitivity to the micro milieu, good solubility in water, and distinct spectral properties. − Depending on the pH of the solution, FL may exist in different tautomeric forms, which make it a model molecule for different adsorption experiments . Because of the high sensitivity toward biopolymers, FL dye is vastly used as a fluorescent agent in the field of disease diagnosis, staining of biological specimens, cell screening in bioimaging, and specific drug delivery. , Although FL is a well-studied organic fluorophore, the information regarding the SEF of this dye due to Ag NPs in aqueous media for possible applications in human cell imaging is limited.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Fluorescence Mediated by Silver Nanoparticles: Implications for Cell Imaging

et al. 2023

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In this study, we report the surface enhanced fluorescence (SEF) of a biologically important organic dye, fluorescein (FL), by silver nanoparticles (Ag NPs) in an aqueous medium and its implications for human cell imaging. The as-synthesized Ag NPs were characterized by dynamic light scattering (DLS), zeta potential, transmission electron microscopy (TEM), and UV–vis absorption spectroscopic studies. The interaction and aggregation of FL dye with Ag NPs and a cationic surfactant, namely, cetyltrimethylammonium bromide (CTAB), were explored by UV–vis absorption and steady-state and time-resolved fluorescence spectroscopic methods. The distance-dependent fluorescence enhancement of FL due to Ag NPs in the solution was also theoretically correlated by three-dimensional finite-difference time-domain (3D-FDTD) simulation. The plasmonic coupling between neighboring NPs facilitated the augmentation of the local electric field, thereby producing various “hotspots” that influence the overall fluorescence of the emitter. J-type aggregates of FL in the presence of the CTAB micelles and Ag NP mixed solution were confirmed by electronic spectroscopy. The density functional theoretical (DFT) study revealed the electronic energy levels associated with different forms of FL dye in the aqueous solution. Most interestingly, the Ag NP/FL mixed system used in fluorescence imaging of human lung fibroblast cells (WI 38 cell line) showed a significantly stronger green fluorescence signal compared to that of FL after an incubation period of only 3 h. This study confirms that the Ag NP mediated SEF phenomenon of the FL dye is also manifested in the intracellular medium of human cells giving a brighter and more intense fluorescence image. The cell viability test after exposure to the Ag NP/FL mixed system was confirmed by the MTT assay method. The proposed study may have an implication as an alternate approach for human cell imaging with higher resolution and more contrast.

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Modified dry bean pod waste (Phaseolus vulgaris) as a biosorbent for fluorescein removal from aqueous media: Batch and fixed bed studies

Cited by 18 publications

References 102 publications

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Efficient and selective removal of Pb²⁺ from aqueous solution by using an O⁻ functionalized metal–organic framework

Enhancement of Fluorescence Mediated by Silver Nanoparticles: Implications for Cell Imaging

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Modified dry bean pod waste (Phaseolus vulgaris) as a biosorbent for fluorescein removal from aqueous media: Batch and fixed bed studies

Cited by 18 publications

References 102 publications

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Sulphuric Acid-Modified Coal Fly Ash for the Removal of Rhodamine B Dye from Water Environment: Isotherm, Kinetics, and Thermodynamic Studies

Efficient and selective removal of Pb2+ from aqueous solution by using an O− functionalized metal–organic framework

Enhancement of Fluorescence Mediated by Silver Nanoparticles: Implications for Cell Imaging

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Efficient and selective removal of Pb²⁺ from aqueous solution by using an O⁻ functionalized metal–organic framework