Adsorption of Cd ions from aqueous solutions by iron modified pomegranate peel carbons: kinetic and thermodynamic studies

Abedi, Mohammad Reza; Salmani, Mohammad Hossein; Mozaffari, M.

doi:10.1007/s13762-016-1002-7

Cited by 26 publications

(18 citation statements)

References 36 publications

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“…Regards to the above, it is concluded that the pH for adsorbents must be selected higher than the pHzpc of adsorbate that it was obtained for Fe 2+ -PPC (4.3) and Fe 3+ -PPC (6.0) in our previous work (Abedi et al 2016 ). In this state, most of the sorption sites on the two composites are negatively charged in the solution.…”

Section: Discussionmentioning

confidence: 73%

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Modification of pomegranate waste with iron ions a green composite for removal of Pb from aqueous solution: equilibrium, thermodynamic and kinetic studies

et al. 2017

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Pomegranate waste modified with Fe2+ and Fe3+ ions followed with carbonization were used as an adsorbent to remove the Pb2+ ions from aqueous solution. To optimum the highest adsorption efficiency, adsorption experiments were conducted on iron modified carbons by batch technique. The characteristic of composite was studied by scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FT-IR). The best pH for control of chemical adsorption was selected within pH of 6.0–6.5. It was observed that the contact time of 90 min, initial concentration 50.0 ppm, and adsorbent dose, 1.0 g/100 ml solution was found to be optimum conditions. On this condition, the maximum adsorption capacity was obtained 27.5 and 22.5 mg/g for Fe2+ and Fe3+ impregnated pomegranate peel carbons (PPC), respectively. The value of Cid, 1.584 for Fe2+-PPC and 0.552 for Fe3+-PPC, indicates that the effect of the boundary layer is more important in adsorption of Pb2+ by Fe2+-PPC and the pore diffusion is the rate limiting mechanism after 30 min. Thermodynamic parameters of Gibbs free energy, enthalpy, and entropy of Pb2+ adsorption on iron-modified carbons suggest that the adsorption process is favorable and spontaneous under the optimum condition.

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Section: Discussionmentioning

confidence: 73%

“…Hence, the idea to change the by-product of pomegranate fruit to iron impregnation carbon for cleaning the environment and removing of heavy metal is valuable. Abedi et al impregnated of Fe 2+ and Fe 3+ ions to the PPC were studied to remove Cd(II) ions (Abedi et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Modification of pomegranate waste with iron ions a green composite for removal of Pb from aqueous solution: equilibrium, thermodynamic and kinetic studies

et al. 2017

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“…Second, 10 g of PP impregnated with iron introduced to the crucible, and placed in the programmable furnace at atmosphere of nitrogen. The mixture was heated in the 400 °C and 3 h to be carbonized in the absence of air that this procedure was optimized in our previous work (Abedi, Salmani et al 2016).…”

Section: Impregnation Of Pomegranate Peel By Fe(iii) Ionsmentioning

confidence: 99%

“…In previous work, we found that pomegranate peel (PP) was an ideal support for iron loading because of the high content of polyphenols and the formation of stable complexes with the iron ions and after carbonization used for removal of Cd ions. The results showed 1.5 fold increases in removal e ciency of cadmium (Abedi, Salmani et al 2016). Hence, the aim of this study is the investigation of iron impregnated to pomegranate peel carbon to adsorb arsenite and arsenate anions from aqueous solution for reducing the toxicity of arsenic oxoanions.…”

Section: Introductionmentioning

confidence: 99%

Reduction of arsenic oxoanion toxicity from contaminated water by adsorption onto iron impregnated biochar

Salmani

Abedi

Mozaffari

et al. 2020

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Several ways have systematically been employed to modify carbons for removing heavy metal from contaminated solution. In the present study, Fe impregnated pomegranate peel carbon (Fe-PPC) as a green adsorbent was prepared by addition of Fe3+ions into the pomegranate peel followed carbonization. Stability of iron on PPC was examined by releasing of Fe ions in aqueous solution at the pH range of 2–10. The effect of contact time, variable pH, and initial concentration were studied in the adsorption of arsenite and arsenate anions by Fe-PPC. Maximum removal of arsenite and arsenate anions were observed in the pH range of 5–6 and 9–11 respectively which were 76.3% and 100%. The elemental analysis and characterization of As -FePPC were performed by energy dispersive X-ray analysis (EDX) and BET. The adsorption rate (ν0) value indicated that the initial rates are suitable for arsenic anions adsorption on Fe-PPC in aqueous solution. The more than one mechanism was governed by the adsorption arsenate and was chemisorption, while the physical adsorption had the more contribution to the arsenite adsorption.

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“…However, the adsorption performance of raw peels was not satisfactory, and thus many chemical treatments were implemented to increase the adsorption capacity, such as acrylonitrile grafted cellulose, carbonization, alkalization and esterification (Zhou et al 2017). The maximum adsorption capacity of Cd(II) and Ni(II) was only 35.52 and 27.40 mg/g for banana peel (BP) (Memon et al 2008, Van Thuan et al 2017, while 22.72 and 10.82 mg/g for pomegranate peel (PP) (Abedi et al 2016, Khawaja et al 2015. To further enhance the adsorption performance of agricultural waste peel on HMIs, a low-cost and efficient modification approach needs to be developed.…”

Section: Introductionmentioning

confidence: 99%

Isotherm, Kinetics, and Adsorption Mechanism Studies of DTPA-Modified Banana/Pomegranate Peels as Efficient Adsorbents for Removing Cd(II) and Ni(II) from Aqueous Solution

Wang

Lin

et al. 2021

Preprint

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Two novel absorbents were synthesized for the first time by banana and pomegranate peels using diethylenetriaminepentaacetic acid (DTPA) modification to eliminate Cd(II) and Ni(II) of sewage. The DTPA-modified peels performed significantly higher adsorption capacity than unmodified materials. Adsorption isotherm and kinetics models were simulated to determine their removal efficiency and potential for recovery of these two heavy metals. As the results, the adsorption reached equilibrium within 5 minutes and was well described by the pseudo-second order model and Langmuir isotherm. The surface morphology analysis of the synthetic materials by Scanning Electron Microscopy-Energy Dispersive X-ray spectroscopy, Fourier Transform Infrared spectroscopy and X-ray Photoelectron Spectroscopy, implied that ion exchange, complexation and physical adsorption may together contribute to Cd(II) and Ni(II) loading on DTPA-modified peels. This study demonstrates the feasibility of waste peels as cost-efficient bio-absorbents to remove Cd(II) and Ni(II) in sewage systems, and discovers potential adsorption mechanism of efficiency improvements after DTPA modification.

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Adsorption of Cd ions from aqueous solutions by iron modified pomegranate peel carbons: kinetic and thermodynamic studies

Cited by 26 publications

References 36 publications

Modification of pomegranate waste with iron ions a green composite for removal of Pb from aqueous solution: equilibrium, thermodynamic and kinetic studies

Modification of pomegranate waste with iron ions a green composite for removal of Pb from aqueous solution: equilibrium, thermodynamic and kinetic studies

Reduction of arsenic oxoanion toxicity from contaminated water by adsorption onto iron impregnated biochar

Isotherm, Kinetics, and Adsorption Mechanism Studies of DTPA-Modified Banana/Pomegranate Peels as Efficient Adsorbents for Removing Cd(II) and Ni(II) from Aqueous Solution

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