Adsorption Behaviour of EDTA Modified Magnetic Fe3O4 Coated Brewed Tea Waste on Cr(VI) Removal

Camoglu, Aslihan Yilmaz; Özdeş, Duygu; Duran, Celal

doi:10.1007/s42250-022-00545-8

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…As compared to other models, the Freundlich model showed the best degree of fit, as indicated by values of R 2 of 0.9903, 0.9830, and 0.9872 for green tea, pu-erh, and tieguanyin, respectively. Similar conclusions have been recorded previously [48–51]. The distribution of pore sizes and the presence of functional groups on the surfaces of the tea residues contributed significantly to their high degree of heterogeneity.…”

Section: Resultssupporting

confidence: 89%

Removal of Hexavalent Chromium by Using Sustainable Green Materials as Low-Cost Adsorbents

Li,

Huang,

Weng

et al. 2023

Adsorption Science & Technology

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The possibility of using three types of NaOH-treated tea residues (green tea, pu-erh, and tieguanyin) as low-cost adsorbents for Cr(VI) treatment was investigated. The surface charge, composition, morphology, structure, and functional groups in the obtained biosorbents were characterized by pHzpc, cellulose content, SEM, BET, XRD, and FTIR spectroscopy. The nonlinear pseudo-first-order, pseudo-second-order, and Elovich models were used to investigate adsorption kinetics at various initial concentrations. The adsorption processes were more consistent with the pseudo-second-order kinetic model in the range of 5-50 mg L-1. The adsorption isotherm at 298 K was described using the nonlinear Langmuir, Freundlich, Temkin-Pyzhev, and Dubinin-Radushkevich models, indicating that the process was favorable and complex with maximum adsorption amounts of 6.15, 19.50, and 12.31 mg g-1 for green tea, pu-erh, and tieguanyin residues, respectively. Thermodynamic analysis revealed that the adsorption was a spontaneous, endothermic process. The results demonstrated that all materials had the potential to successfully remove Cr(VI) from the aqueous solution.

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Section: Resultssupporting

confidence: 89%

Removal of Hexavalent Chromium by Using Sustainable Green Materials as Low-Cost Adsorbents

Li,

Huang,

Weng

et al. 2023

Adsorption Science & Technology

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“…3− ) and Fluoride (F − ) anion adsorption by magnetically modified tea waste adsorbent [16,22,[42][43][44][45]. As far as the removal of phosphate anions is concerned, no reasonable data are available from using Fe 3 O 4 -nanoparticle-impregnated tea waste.…”

Section: Introductionmentioning

confidence: 99%

Tea-Waste-Mediated Magnetic Oxide Nanoparticles as a Potential Low-Cost Adsorbent for Phosphate (PO43−) Anion Remediation

Shah,

Fareed,

Waseem

et al. 2023

Water

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In the current study, magnetic oxide nanoparticle-impregnated tea waste (TW-Fe3O4) is employed as an adsorbent to remove phosphate ions (PO43−) from an aqueous solution. By utilizing a variety of analytical methods, the TW-Fe3O4 nano-adsorbent was characterized by FE-SEM, TEM, EDX, BET, FTIR and XRD. The FE-SEM of TW-Fe3O4 demonstrated the adsorbent’s granular morphology with a variety of magnetic nanoparticle sizes and shapes. The XRD of TW-Fe3O4 showed two diffraction peaks at 2θ values 30.9° and 35.4°, which are in correspondence with the diffraction pattern of magnetite. The synthesis of a TW-Fe3O4 adsorbent with a greater surface area and porosity was demonstrated by BET analysis. Numerous adsorption factors like initial concentration of PO43− ion, pH of the medium, contact time, temperature and adsorbent dose were optimized for phosphate removal. The maximum removal of 92% was achieved by using the adsorbent dose of 1.2 g at 323 K (pH 5). Pseudo-second-order and intra-particle diffusion models were fitted to the sorption kinetic, whereas adsorption isotherm data were found well fitted to Freundlich and Dubinin–Radushkevich (D-R) models. The highest adsorption capacity of TW-Fe3O4 towards phosphate ions was 226.8 mg/g, which is significantly higher than other reported bio-adsorbents. According to thermodynamic data, phosphate adsorption at the solid–liquid interface was of an endothermic and spontaneous nature and characterized by enhanced inevitability.

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The potential of duck egg white as a modifier for activated rice straw to enhance Cr(VI) ions adsorption in an aqueous solution

Putra,

Fauzia,

Deswati

et al. 2024

South African Journal of Chemical Engineering

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Adsorption Behaviour of EDTA Modified Magnetic Fe3O4 Coated Brewed Tea Waste on Cr(VI) Removal

Cited by 3 publications

References 45 publications

Removal of Hexavalent Chromium by Using Sustainable Green Materials as Low-Cost Adsorbents

Removal of Hexavalent Chromium by Using Sustainable Green Materials as Low-Cost Adsorbents

Tea-Waste-Mediated Magnetic Oxide Nanoparticles as a Potential Low-Cost Adsorbent for Phosphate (PO43−) Anion Remediation

The potential of duck egg white as a modifier for activated rice straw to enhance Cr(VI) ions adsorption in an aqueous solution

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