Methylene blue-clay nano-pigment as a new photosensitizer for preparing three-component photoinitiating systems with high thermal stability

Nejadebrahim, A.; Ebrahimi, Mojtaba; Allonas, Xavier; Croutxé‐Barghorn, Céline

doi:10.1016/j.dyepig.2020.108475

Cited by 14 publications

(10 citation statements)

References 33 publications

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“…It is thus difficult assigning the effective amount of MB bound to the sorbent based on TGA spectrum and relevant weight loss. It is noteworthy that consistently with the conclusions raised by Nejadebrahim et al [39], the immobilization of MB allows increasing its stability as shown by the increased values of maximum degradation temperatures (compared with pure MB). The presence of MB also allows increasing the residual mass at 800 • C (from 11.3% to 17.6%).…”

Section: Textural Analysis -Bet Surface Areasupporting

confidence: 83%

“…Nejadebrahim et al [39] investigated the synthesis of photosensitizers based on the formation of MB-clay nanoparticles. They observed that the TGA (and DrTGA) profiles for MB correspond to maximum degradations at 72 • C, 183 • C, 290 • C and 458 • C (which completely disappears after immobilization on clay); the immobilization of the dye on clay allows increasing the stability of the dye with maximum weight losses at 265 • C and 327 • C. For the sorbent, the identification of the degradation steps is made complex by the coexistence of different patterns of degradation associated with alginate, urea and methylene blue compounds.…”

Section: Textural Analysis -Bet Surface Areamentioning

confidence: 99%

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A biogenic tunable sorbent produced from upcycling of aquatic biota-based materials functionalized with methylene blue dye for the removal of chromium(VI) ions

Elwakeel

Elgarahy

Guibal³

2021

Journal of Environmental Chemical Engineering

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The valorization of algal biomass and bi-valve shells allows synthesizing, in the presence of urea, a sorbent highly efficient for methylene blue (MB) sorption (sorption capacity: 1.5 mmol MB g − 1 at pH 5.8). The dye-functionalized sorbent shows enhanced sorption properties for Cr(VI) recovery at pH 3. The sorption isotherm is fitted by the Langmuir equation: maximum sorption capacity reaches 8.53 mmol Cr g − 1 (for MB-loading: 1.5 mmol g − 1 ). Different mechanisms may be involved such as the electrostatic attraction of anionic species, che-lation on reactive groups, reduction of Cr(VI) into Cr(III). Under selected experimental conditions, the sorption is achieved within less than 60 m. The kinetic profiles are controlled by the pseudo-second order rate equation. Alkaline NaCl solutions effciently desorb chromate while maintaining a good stability of the dye (negligible release). Therefore, the sorption and desorption performances are maintained remarkably stable for at least 5 sorption/desorption cycles. The sorbent is successfully applied for chromate recovery from Cr(VI)-spiked solu-tions (tap water and wastewater from petrochemical unit) with limited loss in sorption performances. The sor-bent is characterized by BET, TGA, FTIR, SEM, EDX and zetametry to help in the understanding of binding mechanisms and sorption performances.

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Section: Textural Analysis -Bet Surface Areasupporting

confidence: 83%

Section: Textural Analysis -Bet Surface Areamentioning

confidence: 99%

A biogenic tunable sorbent produced from upcycling of aquatic biota-based materials functionalized with methylene blue dye for the removal of chromium(VI) ions

Elwakeel

Elgarahy

Guibal³

2021

Journal of Environmental Chemical Engineering

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“…Hybrid systems showed a different thermal behavior according to the chemical nature of the nanoclay used [ 55 , 56 ]. In the case of MMT_LEM, the hybrid compound exhibited a thermal behavior consisting of the dehydration of the compound (loss of water adsorbed and intercalated into the MMT), followed by a weak shoulder event centered at 122 °C).…”

Section: Resultsmentioning

confidence: 99%

“…In accordance with the literature, this degradation path, differing from that of the neat matrix, can be rationalized by considering the organic nature of the nanopigments, that were indeed responsible of the decrease in thermal stability of the polyester matrix [36]. The reduction in the thermal stability in the first step of the decomposition process of INZEA can be justified by the fact that unmodified nanoclay could catalyze the hydrolysis reaction, MMT platelets having -OH Hybrid systems showed a different thermal behavior according to the chemical nature of the nanoclay used [55,56]. In the case of MMT_LEM, the hybrid compound exhibited a thermal behavior consisting of the dehydration of the compound (loss of water adsorbed and intercalated into the MMT), followed by a weak shoulder event centered at 122 • C).…”

Section: Bionanocomposites With Lemon Hybrid Pigmentsmentioning

confidence: 99%

Effect of Lemon Waste Natural Dye and Essential Oil Loaded into Laminar Nanoclays on Thermomechanical and Color Properties of Polyester Based Bionanocomposites

et al. 2020

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In this work, polyester-based nanocomposites added with laminar nanoclays (calcined hydrotalcite, HT, and montmorillonite, MMT) loaded with lemon waste natural dye (LD) and essential oil (LEO) were prepared and characterized. The optimal conditions to synthetize the hybrid materials were obtained by using statistically designed experiments. The maximum LD adsorption with HT was found using 5 wt% of surfactant (sodium dodecyl sulfate), 5 wt% of mordant (aluminum potassium sulfate dodecahydrate) and 50% (v/v) ethanol. For MMT, 10 wt% of surfactant (cetylpyridinium bromide), 5 wt% of mordant, 1 wt% of (3-aminopropyl) triethoxysilane and 100% distilled water were used. LEO adsorption at 300 wt% was maximized with MMT, 10 wt% of surfactant and 50 °C following an evaporation/adsorption process. The obtained hybrid nanofillers were incorporated in a polyester-based matrix (INZEA) at different loadings (3, 5, and 7 wt%) and the obtained samples were characterized in terms of thermal stability, tensile behavior, and color properties. HT_LEM-based samples showed a bright yellow color compared to MMT_LEM ones. The presence of lemon hybrid pigments in INZEA-based systems produced a remarkable variation in CIELAB color space values, which was more visible with increasing the nanofillers ratio. A limited mechanical enhancement and reduced thermal stability was observed with the nanopigments addition, suggesting a limited extent of intercalation/exfoliation of MMT and HT in the polymer matrix. MMT_LEM pigments showed higher thermal stability than HT_LEM ones. A significant increase in Young’s modulus of nanocomposites loaded with hybrid LEO was observed compared to the biopolymer matrix. The LEO inclusion into the nanoclays efficiently improved its thermal stability, especially for MMT.

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“…Photopolymerization is one of the most promising methods for synthesizing polymer materials because of its low energy consumption, nonsolvent compositions, and high efficiency. [1][2][3][4][5] Photopolymerization is widely applied in various fields, such as microelectronics, 6 UV-cured coatings, 7 3D microfabrication, [8][9][10] nanotechnology, 11,12 and biomedical applications. 13 Efficient photoinitiators (PIs) or photoinitiation systems (PISs) play an essential role in photopolymerization as they induce the rapid conversion of monomers into polymers by absorbing the appropriate wavelengths of light and generating reactive species, such as free radicals, 14 cations, 15,16 or anions.…”

Section: Introductionmentioning

confidence: 99%

Novel chalcone derivatives with large conjugation structures as photosensitizers for versatile photopolymerization

Chen

Qin

Jin

et al. 2021

Journal of Polymer Science

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Four chalcones with large conjugation structures were designed and synthesized. Strong light absorption within the UV-vis range (λ max = 380-410 nm, ε max = 10,200-33,600 M −1 cm −1) matched the emission of light-emitting diodes within 385-450 nm. Compared with that of phenyl ring-containing chalcone, the bathochromic shift of the four chalcones was due to the enlarged conjugation structure and the intramolecular charge transfer effect. The reactive species produced from two-or three-component photoinitiating systems (PISs) based on chalcone-containing triphenyl amine and N-ethyl carbazole combined with an iodonium salt or/and an amine were highly efficient for versatile photopolymerizations (i.e., radical, cationic, blending, and thiol-ene polymerizations) upon soft exposure conditions (385-425 nm LEDs). UV-vis spectra, theoretical calculation, electrochemistry, real-time nuclear magnetic resonance spectra, and fluorescence quenching were investigated to determine the photochemical mechanism. Chalcone photoisomerization, which mainly occurred in anthracene-containing chalcone, weakened the initiation ability of the PISs. These chalcones have promising applications in photopolymerization.

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Methylene blue-clay nano-pigment as a new photosensitizer for preparing three-component photoinitiating systems with high thermal stability

Cited by 14 publications

References 33 publications

A biogenic tunable sorbent produced from upcycling of aquatic biota-based materials functionalized with methylene blue dye for the removal of chromium(VI) ions

A biogenic tunable sorbent produced from upcycling of aquatic biota-based materials functionalized with methylene blue dye for the removal of chromium(VI) ions

Effect of Lemon Waste Natural Dye and Essential Oil Loaded into Laminar Nanoclays on Thermomechanical and Color Properties of Polyester Based Bionanocomposites

Novel chalcone derivatives with large conjugation structures as photosensitizers for versatile photopolymerization

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