Photocatalytic degradation of caffeine by ZnO-ZnAl2O4 nanoparticles derived from LDH structure

Elhalil, A.; Elmoubarki, R.; Machrouhi, A.; Sadiq, M.; Abdennouri, Mohamed; Qourzal, Samir; Barka, Noureddine

doi:10.1016/j.jece.2017.07.037

Cited by 60 publications

(22 citation statements)

References 61 publications

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“…The DTG of CS presented two endothermic peaks at 80 °C and 295 °C, while ZnAl also presented these two peaks at 250 °C and 300 °C. The maximum decomposition temperature (DTG max ) of CS and ZnAl were recorded, respectively, as 295 °C and 300 °C, values close to those reported elsewhere for CS [40] and different for ZnAl [41,42]. The DTG curve of ZnAl/CS showed three endotherms peaks at 140 °C, 270 °C, and 550 °C with DTG max at 270 °C, in addition to an edge at 250 °C.…”

Section: Resultssupporting

confidence: 84%

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

Gohi

Zeng

et al. 2019

IJMS

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The menace of antimicrobial resistance continues to increase and hence the need to discover new antibiotics, especially alternative and effective sources such as hybrid organic-inorganic, organic-organic materials, and other combinations. In this study, an antimicrobial hybrid supra-nano material was prepared by the bi-titration synthesis method of chitosan (CS) and ZnAl layered double hydroxide. Fourier-transform infrared spectrometer (FTIR), thermogravimetric and differential thermal gravimetric (TGA/DTG), ultraviolet-visible (UV-Vis), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses indicated that the ZnAl/CS hybrid exhibited low crystallinity with high thermal stability. The results of ZnAl/CS characterization showed the characteristic properties of the individual components ZnAl and CS, indicating a successful preparation of the ZnAl/CS hybrid. The antibacterial tests revealed that the ZnAl/CS hybrid possessed an enhanced antimicrobial effect against both Escherichia coli (E. coli, MTCC 739) and Penicilliumcyclopium (P. cyclopium, AS 3.4513). Under the central composite design (CCD) of the response surface methodology (RSM) tool, the parameters of the hybrid synthesis reaction were optimized and the result obtained was as follows: reaction pH was 11.3, reagent Zn/Al ratio was 3.27, and chitosan concentration was 1.07 g/L. After optimization, it was found that the antibacterial activity of ZnAl/CS was strengthened against E. coli as evidenced by a widening of the inhibition zone of about 41.6%. The antibacterial activity of ZnAl/CS was mainly due to the reactivation of the antibacterial activity of CS associated with the release of Zn2+ and Al3+ metal ions in addition to ZnO, Al2O3, and ZnAl2O4 compounds resulting from the method of preparation.

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Section: Resultssupporting

confidence: 84%

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

Gohi

Zeng

et al. 2019

IJMS

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“…At this step, U-LDH 5 remained a layered structure. The second stage of weight loss, between 300 and 450 °C, was due to the decomposition of the interlayer CO32− and the removal of the hydrotalcite-plate-OH, marking the delamination of the layered structure [49]. The last weight lost, that can be attributed to the decomposition of carbonate ions in the interlayer, started after 700 °C [50].…”

Section: Resultsmentioning

confidence: 99%

Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities

et al. 2019

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Hybrid nano-supra molecular structured materials can boost the functionality of nano- or supra-molecular materials by providing increased reactivity and conductivity, or by simply improving their mechanical stability. Herein, the studies in materials science exploring hybrid systems are investigated from the perspective of two important related applications: healthcare and food safety. Interfacing phase strategy was applied, and ZnAl layered double hydroxide-chitosan hybrids, prepared by the urea method (U-LDH/CS), were successfully synthesized under the conditions of different chitosan(CS) concentrations with a Zn/Al molar ratio of 5.0. The structure and surface properties of the U-LDH/CS hybrids were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectrometer(FTIR), scanning electronmicroscopy (SEM), ultravioletvisible (UV-Vis), and zero point charge (ZPC) techniques, where the effect of CS concentration on the structure and surface properties was investigated. The use of the U-LDH/CS hybrids as antimicrobial agents against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium was investigated in order to clarify the relationship between microstructure and antimicrobial ability. The hybrid prepared in a CS concentration of 1.0 g∙L−1 (U-LDH/CS1) exhibited the best antimicrobial activity and exhibited average inhibition zones of 24.2, 30.4, and 22.3mm against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium, respectively. The results showed that the appropriate addition of CS molecules could increase antimicrobial ability against microorganisms.

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“…Hydrotalcites are materials of the anionic clays type consisting of sheets of mixed metal hydroxides that generate a positive charge in the sheets and that are neutralized by anions that are in the interlaminar spaces. e method of synthesis of hydrotalcites as well as the conditions of thermal treatment of hydrotalcites to thermally evolve them to mixed metal oxides can influence the formation of metal oxide nanoparticles with porous structures, larger and better reactive sites, and superparamagnetic properties [44][45][46]. is article describes the synthesis conditions of hydrotalcites and the effect of the metallic Mg/Al ratio in obtaining activated hydrotalcites to improve the photocatalytic properties of hydrotalcites in the degradation of 2,4,6-trichlorophenol without need to dope with some transition metals.…”

Section: Introductionmentioning

confidence: 99%

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6‐Trichlorophenol

Ramos-Ramírez

Ortega

Tzompantzi

et al. 2018

Advances in Materials Science and Engineering

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A gallery of hydrotalcite-type mesoporous materials with different Mg/Al molar ratios were synthesized by the coprecipitation method. The materials were activated by heat treatment to test their activity in the photodegradation of 2,4,6-trichlorophenol under UV light irradiation. The physicochemical properties of the different synthesized and activated materials were determined using XRD, physical adsorption/desorption of N2, FTIR, SEM, DTA, and TGA. Their banned band energy was determined by UV-Vis to identify their potential to be used as a semiconductor in catalytic photodegradation processes. The results of photodegradation tests of 2,4,6-trichlorophenol showed that hydrotalcites have a high degradation capacity, up to 100% for the catalyst of Mg/Al ratio = 2, with a high mineralization capacity of 80%. The degradation capacity of most of the catalysts tested is mainly due to the presence of holes and the formation of superoxide free radicals, which are the determining species within the degradation mechanism.

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Photocatalytic degradation of caffeine by ZnO-ZnAl2O4 nanoparticles derived from LDH structure

Cited by 60 publications

References 61 publications

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities

Activated Hydrotalcites Obtained by Coprecipitation as Photocatalysts for the Degradation of 2,4,6‐Trichlorophenol

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