A novel statistical approach for the synthesis of Chalcones viaClaisen-Schmidt condensation catalyzed by Pd nanoparticles modified mesoporous TiO2 as an efficient heterogeneous catalyst

“…The samples were outgassed overnight at 373 K prior to adsorption analysis. Specific surface areas, SSA, were calculated according to the Brunauer-Emmett-Teller (BET) method [56,57] to much slower degradation rates, resulting from the poor accessibility of dye of dye molecules to the catalyst. Moreover, the MCC will increase the dispersibility of Pani particles in aqueous solution, which will result in better catalytic activity comparing to neat Pani [47].…”

Section: Characterization Methodsmentioning

confidence: 99%

Heterogeneous photocatalytic degradation of anionic dye on polyaniline/microcrystalline cellulose composite

et al. 2022

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The development of novel polymeric composites, especially those based on conductive polymers has attracted a consider-able attention due to their applications in a wide range of fields. This study focuses on one of these biocomposites based on polyaniline Pani and a biopolymer (microcrystalline cellulose MCC), synthesized by in-situ polymerization of aniline using ammonium persulfate (APS) as oxidant at room temperature. Firstly, different amounts of MCC were dispersed in HCl solu-tion with aniline monomer under stirring. Then a mixture of APS/HCl solution was introduced into the first aniline-MCC-HCl mixture. The obtained materials as well as Pani and MCC were characterized using powder X-ray diffraction (XRD), Argon adsorption-desorption (BET/DFT), thermal analysis, fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thus, a correlation between interesting structural/textural/morphological data of these materials will be established. The results confirm the formation of Polyaniline-MCC composite under well determined conditions which has a more compact homogeneous morphology and a higher thermal stability than those of Pani and MCC. Furthermore, these materials are used for the catalytic degradation of toxic anionic dye namely Methyl Orange (MO) from aqueous media under UV light irradiation. The optimum values were 0.1 g L − 1 of photocatalyst, 30 ppm of MO solution, and pH solution of 5.6, which allowed reaching 97% within 70 min with high stability after four continuous runs. The photodegradation kinetics of MO onto composite followed the pseudo-first order model.

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“…For these Equations, it is worth recalling that a positive sign in the regression equation represents the synergistic effect between parameters, whereas a negative sign indicates an antagonistic effect [41].…”

Section: Model Fitting For Tensile Strengthmentioning

confidence: 99%

Optimization of tensile strength of PLA/clay/rice husk composites using Box-Behnken design

Yiga

Lubwama

Pagel

et al. 2021

Biomass Conv. Bioref.

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It is extremely important to save costs and time while enhancing accuracy in experimentation. However, no study has utilized response surface methodology (RSM) to obtain the effects of independent parameters on properties of PLA/clay/rice husk composites. This study focused on optimization of tensile strength of fiber-reinforced polylactic acid (PLA) composites. RSM using Box-Behnken design (BBD) was used to determine optimum blending parameters of the developed composites. Fiber-reinforced PLA composites were prepared using compression molding. Rice husk fiber and clay filler were used to enhance tensile properties of PLA. Five factors, namely, clay filler loading (1 − 5 wt.%), rice husk fiber loading (10 − 30 wt.%), alkali concentration (0 − 4 wt.%), rice husk variety (K85, K98), and alkali type (NaOH, Mg(OH)2) were varied with 68 individual experiments. Tensile tests were carried out according to ASTM D638 standards. ANOVA results revealed that the quadratic models best fit the tensile strength response, with filler loading and fiber loading factors as the most significant model terms. Interaction effects were more predominant than linear and quadratic effects. The developed models used to determine maximum tensile strengths of PLA/clay/rice husk composites were in close agreement with experimental findings (R2 values of 0.9635, 0.9624, 0.9789, and 0.9731 for NaOH-modified K85 rice husks, Mg(OH)2-modified K85 rice husks, NaOH-modified K98 rice husks, and Mg(OH)2-modified K98 rice husks respectively). Individual optimal conditions were used to predict maximum tensile strengths in each set of developed composites. The predicted tensile strengths were 32.09 MPa, 33.69 MPa, 32.47 MPa, and 32.75 MPa for PLA/clay composites loaded with NaOH-modified K85 rice husks, Mg(OH)2-modified K85 rice husks, NaOH-modified K98 rice husks, and Mg(OH)2-modified K98 rice husks, respectively, which were very close to the obtained experimental values of 31.73 MPa, 33.06 MPa, 32.02 MPa, and 31.86 MPa respectively.

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A novel statistical approach for the synthesis of Chalcones viaClaisen-Schmidt condensation catalyzed by Pd nanoparticles modified mesoporous TiO2 as an efficient heterogeneous catalyst

Cited by 27 publications

References 52 publications

A mechanistic study of the photocatalytic activity of AgI–WO₃ in an experimentally designed approach toward methylene blue photodegradation

A mechanistic study of the photocatalytic activity of AgI–WO₃ in an experimentally designed approach toward methylene blue photodegradation

Heterogeneous photocatalytic degradation of anionic dye on polyaniline/microcrystalline cellulose composite

Optimization of tensile strength of PLA/clay/rice husk composites using Box-Behnken design

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A novel statistical approach for the synthesis of Chalcones viaClaisen-Schmidt condensation catalyzed by Pd nanoparticles modified mesoporous TiO2 as an efficient heterogeneous catalyst

Cited by 27 publications

References 52 publications

A mechanistic study of the photocatalytic activity of AgI–WO3 in an experimentally designed approach toward methylene blue photodegradation

A mechanistic study of the photocatalytic activity of AgI–WO3 in an experimentally designed approach toward methylene blue photodegradation

Heterogeneous photocatalytic degradation of anionic dye on polyaniline/microcrystalline cellulose composite

Optimization of tensile strength of PLA/clay/rice husk composites using Box-Behnken design

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Product

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A mechanistic study of the photocatalytic activity of AgI–WO₃ in an experimentally designed approach toward methylene blue photodegradation

A mechanistic study of the photocatalytic activity of AgI–WO₃ in an experimentally designed approach toward methylene blue photodegradation