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Anne Beatriz Figueira Câmara,Rafael Viana Sales,Carlos Vital dos Santos Júnior,Miguel Angelo Fonseca de Souza,Clenildo de Longe,Thiago Medeiros Chianca,Rosangela Dala Possa,Luiz Carlos Bertolino,Lucie 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Palygorskite clay mineral (Pal) was employed in the removal of Congo red (CR) and methylene blue (MB)dyes pollutants in aqueous effluents by the adsorption process. The materials, Pal raw and acid Pal (Apal), were characterizedby SEM, EDX, XRD, XFR, FTIR, XPS and Raman spectroscopy techniques that evidenced the main active sitesof clay mineral. Characterization data indicated that acid treatment caused a leaching process of metallic cations on thePal surface. As result, the maximum adsorption capacity was increased from 11.3 to 120.5mg·g1 and from 2.7 to238.1mg·g1 for MB and CR dyes, respectively. The regeneration result after five cycles was of 75% recovered to MBadsorption into Apal. Semi-empirical quantum mechanical (SQM) calculations were performed to identify the mechanismof interaction between the Pal surface and dyes. High correlation (R2>0.99) was observed for the experimentaldata using the pseudo-second-order kinetic model, that were confirmed by computed enthalpy values (298.7 to 84.5 kJ·mol1), suggesting a chemisorption process as the determining step. Furthermore, the experimental and computationalresults indicated that the Pal also could work removing efficiently two dyes simultaneously with an adsorptioncapacity of 37.2 and 40.4mg·g1 for MB and CR, respectively.
Larissa Costa Zorzanelli,Elaine Cristina L. Pereira,Layz Mata Salimena,Elen B. A. Vasques Pacheco,Antonio Henrique Monteiro F. T. Silva,Luiz Carlos Bertolino,Milton B. Bastos,Ana Maria F. de Sousa,Ana 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In the present research, high-density polyethylene (HDPE) and polyester, poly(ethylene terephthalate) (PET), residue fromplatforms offshore, were blended in the presence of a coupling agent, a polyethylene-grafted maleic anhydride (HDPE-g-MA). The HDPE/HDPE-g-MA/PET blends were processed by melt mixing in a twin-screw extruder, using a factorial design. Theprocessing conditions were set so that the PET remained in the fiber shape in the melt. The effect of a nanoclay, montmorilloniteclay (MMT), in the blends as co-compatibilizer was evaluated by mechanical, rheological, thermal and morphologicalanalyses. The results showed that there is an interaction between PET fibers and MMT nanoclay. The yield properties(stress and strain) decreased with the addition of PET fibers. Young’s modulus and stress at break property increased withhigh PET fibers and MMT contents. An interaction between PET and MMT contents was also observed on the maximumdegradation temperature (TMÁX): the compositions with higher PET and MMT contents showed a higher thermal stability. The rheological results showed that a more pronounce solid-like behavior was achieved when MMT was added in the HDPE/HDPE-g-MA/PET blend. These results indicate that MMT nanoclay has potential as co-compatibilizer in HDPE/HDPE-g-MA/PET blends. This was due to its preferential localization in the PET fiber domains and interphase between HDPE andPET, as showed in SEM analysis.