Phosphate removal from synthetic and real wastewater using thermally treated seagrass residues of Posidonia oceanica

Photiou, Panagiota; Κουτσοκέρας, Λουκάς; Constantinides, Georgios; Koutinas, Michalis; Vyrides, Ioannis

doi:10.1016/j.jclepro.2020.123294

Cited by 28 publications

(14 citation statements)

References 32 publications

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“…The kinetic equations below show the linear and non-linear form of the pseudo-first-order model [ 21 , 52 , 53 , 54 , 55 , 56 ]:

…”

Section: Resultsmentioning

confidence: 99%

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Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Aziam,

Stefan,

Nouaa

et al. 2024

Nanomaterials

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The aim of this work is to characterize and evaluate the retention of Cu2+ and Ni2+ from single and binary systems by alginate–−Moroccan clay bio−composite with the utilization of calcium chloride as a cross−linking agent, using the ionotropic gelation method. The bio−nanocomposite was characterized by using a variety of techniques (SEM, EDX, XRD, and pHPZC). The efficiency of the adsorbent was investigated under different experimental conditions by varying parameters such as pH, initial concentration, and contact time. To demonstrate the adsorption kinetics, various kinetic models were tried and assessed, including pseudo−first−order, pseudo−second−order, intraparticle diffusion, and Elovich models. The research results show that the adsorption process of Cu2+ and Ni2+ metal ions follows a pseudo−second−order kinetic model, and the corresponding rate constants were identified. To evaluate the parameters related to the adsorption process in both single and binary systems, different mathematical models of isotherms, such as Langmuir, Freundlich, Temkin, and Dubinin–−Radushkevich, were investigated. The correlation coefficients obtained showed that the most suitable isotherm for describing this adsorption process is the Langmuir model. The process is considered to be physical and endothermic, as suggested by the positive values of ΔH° and ΔS°, indicating increased randomness at the solid/liquid interface during Cu2+ and Ni2+ adsorption. Furthermore, the spontaneity of the process is confirmed by the negative values of ∆G°. The bio−nanocomposite beads demonstrated a maximum adsorption capacity of 370.37 mg/g for Ni2+ and 454.54 mg/g for Cu2+ in the single system. In the binary system, the maximum adsorption capacities were observed to be 357.14 mg/g for Ni2+ and 370.37 mg/g for Cu2+. There is significant evidence for the use of alginate–−Moroccan clay bio−nanocomposite as a cost−effective alternative adsorbent for the efficient removal of metal ions in single and binary systems.

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“…The kinetic equations below show the linear and non-linear form of the pseudo-first-order model [ 21 , 52 , 53 , 54 , 55 , 56 ]:

…”

Section: Resultsmentioning

confidence: 99%

“…The linear and non-linear forms of the pseudo-second-order kinetic model are illustrated as below [ 21 , 54 , 55 , 56 , 57 , 58 , 59 ]:

where k 2 (g.mg −1 . min −1 ) is the rate constant of the pseudo-second-order kinetic model.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Aziam,

Stefan,

Nouaa

et al. 2024

Nanomaterials

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“…The kinetics equation of the pseudo-first-order model and its linearized form may be represented as follows [ 13 , 50 , 51 , 52 , 53 , 54 ]:

where k 1 (min −1 ) is the rate constant for the pseudo-first-order kinetics model, q e (mg.g −1 ) and q t (mg.g −1 ) are the amounts of H 2 PO 4 − , HPO 4 2− , and NO 3 − ions retained on weight unit of adsorbent at equilibrium, and at any time t (min), respectively.…”

Section: Resultsmentioning

confidence: 99%

Alginate–Moroccan Clay, New Bio-Nanocomposite for Removal of H2PO4−, HPO42−, and NO3− Ions from Aqueous Solutions

Aziam,

Stefan,

Aboussabek

et al. 2023

Polymers

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The aim of this work is to synthesize and characterize alginate–Moroccan clay bio-composite in order to improve our understanding of the adsorption of inorganic pollutants found in textile effluents. Characterization of the bio-composite used was carried out using a variety of techniques (IR-TF, SEM, DRX, and pHZPC). The influence of the medium’s physico-chemical parameters (temperature, pH, initial concentration, etc.) on the retention of inorganic pollutants was also studied. Studies of adsorption and inorganic pollutants such as orthophosphate (H2PO4− and HPO42−) and nitrate (NO3−) ions were carried out, using simple solutions from the laboratory, in a batch system. This study explored the impact of adsorbent dose, contact time, solution pH, and temperature on the adsorption process. Various kinetic models, including pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich models, were tested and evaluated, to illustrate the adsorption kinetics. This study’s findings demonstrated that the adsorption process follows second-order kinetics, with associated rate constants successfully determined. The correlation coefficient for the pseudo-second-order kinetic model is nearly equal to 1 (>0.98), and the value of theoretical adsorption capacity (qe,the) is comparable to the experimental one (qe,the = 58.14 mg/g for H2PO4−, qe,the = 54.64 mg/g for HPO42−, and qe,the = 52.63 mg/g for NO3−). Additionally, the adsorption equilibrium was investigated through the application of various mathematical models, including the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models, to assess the mechanistic parameters associated with the adsorption process. Among these models, the Langmuir isotherm emerged as the most suitable one for characterizing the adsorption of H2PO4−, HPO42−, and NO3− ions using bio-nanocomposite beads. The maximum adsorbed amounts of metal ions by the bio-nanocomposite used were 625 mg/g for H2PO4−, 909.09 mg/g for HPO42−, and 588.23 mg/g for NO3− from the batch system. The endothermic and physical nature of the adsorption is suggested by the positive values of ΔH°, which is consistent with experimental findings. The adsorption process is spontaneous, as evidenced by the negative ΔG° values. Positive ΔS° values indicate increased randomness at the solid/liquid interface during adsorption of ion-organic ions onto the engineered bio-nanocomposite. The obtained results demonstrated that, from a scientific perspective, alginate–Moroccan clay bio-nanocomposites exhibit a highly significant adsorption capability for the removal of oxyanions in aqueous environments.

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“…Other possible applications suggested are the utilization of the biochar as adsorbent for removing phosphate from wastewaters [97], or as catalyst for Fenton-like treatment of olive mill wastewater [94].…”

Section: Biochar (Bio-oil Syngas) Production From Olive Mill Waste And/or Pruning Residuesmentioning

confidence: 99%

Available Pathways for Operationalizing Circular Economy into the Olive Oil Supply Chain: Mapping Evidence from a Scoping Literature Review

et al. 2021

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Circular economy (CE) is increasingly seen as a promising paradigm for transitioning agri-food systems towards more sustainable models of production and consumption, enabling virtuous and regenerative biological metabolisms based on strategies of eco-efficiency and eco-effectiveness. This contribution seeks to provide a theoretical and empirical framework for operationalizing the CE principles into the olive oil supply chain, that plays a central role in the agroecological systems of the Mediterranean region. A scoping literature review has been conducted in order to identify the available pathways so far explored by scholars for reshaping the olive oil supply chain from a circular perspective. The analyzed literature has been charted on the base of the circular pathway examined, and according to the supply chain subsystem(s) to which it refers. Results are discussed highlighting the main issues, the technology readiness level of the available pathways, the prevailing approaches and knowledge gaps. A synthetic evidence map is provided, framing visually the scrutinized pathways into the Ellen MacArthur Foundation’s CE ‘butterfly’ graph. The work is intended to be a valuable baseline for inquiring how circularity can be advanced in the specific supply chain of olive oil, and which are the strategic opportunities, as well as the barriers to overcome, in order to foster the transition.

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Phosphate removal from synthetic and real wastewater using thermally treated seagrass residues of Posidonia oceanica

Cited by 28 publications

References 32 publications

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Alginate–Moroccan Clay, New Bio-Nanocomposite for Removal of H2PO4−, HPO42−, and NO3− Ions from Aqueous Solutions

Available Pathways for Operationalizing Circular Economy into the Olive Oil Supply Chain: Mapping Evidence from a Scoping Literature Review

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