2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

Elwakeel, Khalid Z.; Al‐Bogami, Abdullah S.; Guibal, Eric

doi:10.1016/j.cej.2020.126265

Cited by 74 publications

(26 citation statements)

References 102 publications

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“…Figure 9 plots present the calculated TBARS values of chicken breast fillets which were packaged with the most active film, i.e., the LDPE/CS_BO10 film, as well as with the "blank" LDPE film. The storage period was seven (7) and fourteen (14) days and the storage temperature was 4 • C. The initial TBARS values of chicken breast fillets were estimated at around 0.14 mg MDA/kg. Such values are consistent with others reported previously [31,32].…”

Section: Lipid Oxidationmentioning

confidence: 99%

“…Although CS cannot be used directly in industrial extrusion molding processes, CS based materials have been recently reported as versatile and cost-competitive materials for various industrial applications [ 4 , 5 , 6 , 7 ]. To overcome the obstacles of this raw material use for such applications, the co-extrusion of the CS with synthetic polymers such as LDPE is proposed by researchers [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of a Novel Chitosan/Basil Oil Blend and Development of Novel Low Density Poly Ethylene/Chitosan/Basil Oil Active Packaging Films Following a Melt-Extrusion Process for Enhancing Chicken Breast Fillets Shelf-Life

et al. 2021

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An innovative process for the adsorption of the hydrophobic Basil-Oil (BO) into the hydrophilic food byproduct chitosan (CS) and the development of an advanced low-density polyethylene/chitosan/basil-oil (LDPE/CS_BO) active packaging film was investigated in this work. The idea of this study was the use of the BO as both a bioactive agent and a compatibilizer. The CS was modified to a CS_BO hydrophobic blend via a green evaporation/adsorption process. This blend was incorporated directly in the LDPE to produce films with advanced properties. All the obtained composite films exhibited improved packaging properties. The film with 10% CS_BO content exhibited the best packaging properties, i.e., 33.0% higher tensile stress, 31.0% higher water barrier, 54.3% higher oxygen barrier, and 12.3% higher antioxidant activity values compared to the corresponding values of the LDPE films. The lipid oxidation values of chicken breast fillets which were packaged under vacuum using this film were measured after seven and after fourteen days of storage. These values were found to be lower by around 41% and 45%, respectively, compared with the corresponding lipid oxidation values of pure LDPE film.

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Section: Lipid Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of a Novel Chitosan/Basil Oil Blend and Development of Novel Low Density Poly Ethylene/Chitosan/Basil Oil Active Packaging Films Following a Melt-Extrusion Process for Enhancing Chicken Breast Fillets Shelf-Life

et al. 2021

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“…a source of pressure, of power E T ). Then, it is possible to calculate the parameter W S as: (5) US could be used only when Q T = 0 (Figure 3) from t 1 to t 2 . Alogenation of aromatic hydrocarbon 20 6.31 [10] Glucose oligomerization 20 6.67 [11] Furoin alkylation 25 22.7 [12] Condensation between nitrobenzaldehyde and acetone 59 483.9 […”

Section: Discussion and Resultsmentioning

confidence: 99%

“…The preparation of innovative heterogeneous catalysts using US in their synthesis procedure have been proposed, for example, for iron based catalysts for Fischer-Tropsch process [4]. US have been also applied to increase the performance of sorptiondesorption processes [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Basic Economic Analysis for Sonochemical Processes

Pirola

2020

J. Chem. Eng. Res. Updates.

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Ultrasound (US) and other non-traditional energy sources (for instance microwave (MW)) are widely used to increase the rate of chemical reactions, to prepare nanoparticles, to extract natural products etc. In all such cases, the scaling-up of the process must have a defined economic constraint, which generally can be reduced to the evaluation of the parameter RC, which is the ratio between the raw energy cost to produce US (or MW) and the total production cost for unit mass of product. The paper gives a basic correlation among the different parameters to evaluate RC both for processes using only US (or MW and other not traditional sources) and those with mixed energy sources.

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“…Fe 3 O 4 nanoparticles were synthesized by the hydrothermal coprecipitation of ferric and ferrous salts according to the method previously reported by Elwakeel et al [68], derived from Massart [69]. The two precursors (i.e., FeSO 4 ⋅7H 2 O, 5.0 g, and (NH 4 )Fe(SO 4 ) 2 ⋅12H 2 O, 17.35 g) were dissolved in demineralized water (250 mL).…”

Section: Synthesis Of Sorbents 221 Synthesis Of Fe 3 O 4 Nanoparticlesmentioning

confidence: 99%

Effect of agitation mode (mechanical, ultrasound and microwave) on uranium sorption using amine- and dithizone-functionalized magnetic chitosan hybrid materials

Elwakeel

Hamza

Guibal

2021

Chemical Engineering Journal

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Magnetic chitosan nanoparticles, activated by glycidyl methacrylate, can be functionalized by grafting dieth-ylenetriamine (DETA) and dithizone for improving U(VI) sorption at pH around 5. The physicochemical prop-erties of the materials have been characterized by a wide variety of analytical techniques. Uranyl sorption increases with the pH (progressive deprotonation of amine and sulfur groups). Uptake kinetics are controlled by the agitation mode: the equilibrium time is reduced while using ultrasonic treatment (especially at highest frequency: 80 kHz): the cavitation effect improves the accessibility to internal reactive groups (sorption capacity is increased). The diffusivity coefficient is increased by 4-5 times. In the case of microwave, the sorption capacity is significantly reduced (especially for R-Dithizone, down to 0.8 mmol U g − 1 ) because of temperature increase, which limits the sorption (exothermic mechanism). Mass transfer is tremendously enhanced: equilibrium time is less than 60 s (30 min for ultrasonic treatment and 120 min with mechanical agitation). Sorption capacity at monolayer saturation (Langmuir) decreases with increasing the temperature from 2.20 to 1.74 mmol U g − 1 for R-Amine (from 1.77 to 1.22 mmol U g − 1 for R-Dithizone). The sorption enthalpy is close to − 19.7 kJ mol − 1 for R-Amine (with positive entropy change, ΔS • ) and − 34.2 kJ mol − 1 for R-Dithizone (negative ΔS • ). Metal desorption is highly efficient using 0.3 M Na 2 CO 3 /0.1 M H 2 O 2 solution. Metal desorption is instantaneous (less than 1 min) and complete when using microwave treatment. The ultrasonic treatment allows improving desorption efficiency and decreasing the concentration of the eluent compared with mechanical agitation. The process is successfully applied for uranyl separation from the leachates of marine sediments, especially in the presence of Complexon III (masking agent).

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2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

Cited by 74 publications

References 102 publications

Synthesis of a Novel Chitosan/Basil Oil Blend and Development of Novel Low Density Poly Ethylene/Chitosan/Basil Oil Active Packaging Films Following a Melt-Extrusion Process for Enhancing Chicken Breast Fillets Shelf-Life

Synthesis of a Novel Chitosan/Basil Oil Blend and Development of Novel Low Density Poly Ethylene/Chitosan/Basil Oil Active Packaging Films Following a Melt-Extrusion Process for Enhancing Chicken Breast Fillets Shelf-Life

Basic Economic Analysis for Sonochemical Processes

Effect of agitation mode (mechanical, ultrasound and microwave) on uranium sorption using amine- and dithizone-functionalized magnetic chitosan hybrid materials

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