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Christian Cruzat

Bio: Christian Cruzat is an academic researcher from University of Cuenca. The author has contributed to research in topics: Adsorption & Colloidal gold. The author has an hindex of 3, co-authored 8 publications receiving 23 citations.

Papers
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TL;DR: In this paper, the mathematical modeling of acetaminophen removal in a fixed-bed adsorption column using sugarcane bagasse (SB) as adsorbent was studied, and experimental data were fitted to six analytical models: Thomas, modified dose-response, Yoon-Nelson, Bohart-Adams, Wang, and Wolborska.
Abstract: In this work, the mathematical modeling of acetaminophen (ACT) removal in a fixed-bed adsorption column using sugarcane bagasse (SB) as adsorbent was studied. Experimental data were fitted to six analytical models: Thomas, modified dose-response, Yoon-Nelson, Bohart-Adams, Wang, and Wolborska. Three experimental tests were carried out at 2.5 mL/min of flow rate, 57 mg/L of ACT concentration, and bed heights of 23, 33, and 43 cm. The predicted breakthrough curve by modified dose-response model agreed acceptably (R2 > 0.91) with experimental curves. Besides, a computational fluid dynamic (CFD) model was developed to simulate and analyze the ACT concentration inside of the adsorption column and the wall channeling effect. The simulated breakthrough curve had a good reproducibility with experimental data, the maximum error between experimental and predicted points was 7.03%. In addition, the CFD model shows a high mass transfer zone and a slow adsorption rate in all three tests of ACT adsorption; the mass transfer zone grew as the bed height increased, whereas the wall channeling effects disappeared with increasing bed height. Also, the diffusion resistances and axial dispersion phenomenon were relevant. The results of this research work demonstrate the usefulness of computational fluid dynamics analysis to understand better the adsorption process.

20 citations

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TL;DR: The purpose of the use of chitosan was acting as a carrier for some magnetic NPs, which toxicity would allow to obtain new polymeric materials with potential applications as magnet future drugs carrier.

20 citations

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TL;DR: In this paper, the authors compared analytical models and a theoretical mechanistic model for the dynamic behavior of the sulfamethoxazole adsorption on sugarcane bagasse.

16 citations

Journal ArticleDOI
30 Oct 2021-Polymers
TL;DR: In this article, polymeric fibers made of recycled polyethylene terephthalate (r-PET) from post-consumer water bottles, functionalized with 0, 1.5, 3% and 6% zinc oxide nanoparticles (ZnO-NPs) in function of r-PET weight, were elaborated to evaluate their antibacterial and antifungal characteristics.
Abstract: Currently, to reduce the environmental problems associated with plastic waste, methods are being sought to use this waste as raw materials in different applications, such as fibers. In addition, to improve these materials and provide different properties, nanoparticles (NPs) are incorporated. In the present work, polymeric fibers made of recycled polyethylene terephthalate (r-PET) from post-consumer water bottles, functionalized with 0%, 1.5%, 3% and 6% zinc oxide nanoparticles (ZnO-NPs) in function of r-PET weight, were elaborated to evaluate their antibacterial and antifungal characteristics. The ZnO-NPs were synthesized by the solvothermal method, obtaining particles with a mean diameter of 38.15 nm, while the fibers were obtained by electrospinning with a diameter range between 200–5000 nm. The functionalized fibers were carried out against Escherichia coli and Bacillus subtilis through the agar diffusion method, obtaining the highest inhibition halo at 6% w/w ZnO-NPs, being 26.5 mm and 34.25 mm, respectively. In addition, the same method was used to evaluate the antifungal activity of Penicillium s.p. and Fusarium graminearum, observing antifungal properties due to the presence of nanoparticles in the fibers.

10 citations

Journal ArticleDOI
TL;DR: In this article , a fixed-bed column to remove sulfamethoxazole packed with sugarcane bagasse was scaled up from laboratory (DL = 2.2 cm) to pilot unit (DP = 4.4 cm).
Abstract: The scaling up of adsorption columns is a crucial step toward the removal of emerging pollutants from domestic and industrial wastewaters. In this study, a fixed-bed column to remove sulfamethoxazole packed with sugarcane bagasse was scaled up from laboratory (DL = 2.2 cm) to pilot unit (DP = 4.4 cm) using a scaling factor (K = 2). In addition to the basic similarity rules for scaling, three new criteria were proposed for the mass adsorbent, flow rate, and bed volume. Then, three lab-scale tests at flow rate of 5 mL/min and bed heights of 15, 25, and 35 cm were transferred to the pilot-scale column at flow rate of 20 mL/min and bed heights of 30, 50, and 70 cm, respectively. The breakthrough curves and the fixed-bed parameters (residence time tR, saturation time ts, adsorption capacity qe, volume of solution treated Vef, and removal percentage %R) obtained in both scales were compared to define their effect with the increase of scale. Finally, a mechanistic model was proposed to predict the breakthrough curves in both columns. The results exhibited that the breakthrough curves in the pilot-scale prolonged in time with higher breakthrough and saturation times than the laboratory breakthrough data. Additionally, tR, ts, and Vef changed in function of the K value used: ts and tR doubled their value in the pilot column or tRP=KtRL; Vef was eight times higher in the pilot column than the lab-column or VefP=K3VefL; qe and %R remained constant in both scales; these results were corroborated with the predicted breakthrough curves. Besides, the mechanistic model predicted with great precision the breakthrough data in both scales (R2>0.9), which means that the model can be used confidently for scaling up purposes. This study demonstrated new criteria which can be easily applied to scale up adsorption columns whit results that showed a correlation between both scales.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a review of ACT adsorption from water is presented, where the authors elaborate on the recent progress on ACT adsors from water, present the findings in a structured written report and identify interesting new foundations for further work.

34 citations

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TL;DR: In this paper, the extraction of Fe(III), Ni(II), and Co(II) was analyzed in a chloride medium using a mixed extractant consisting of 50% tributyl phosphate (TBP), 20% 2-octanol and 30% kerosene.

27 citations

Journal ArticleDOI
TL;DR: In this article, the preparation and antibacterial evaluation of chitosan (CHT), carboxymethyl chitosaan (CMC), and their respective metal composites were performed using Fourier Transform Infrared (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and XRD.

21 citations

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TL;DR: In this paper, the first time successful synthesis of AuNPs using a new precursor salt of Au(III) acetate through USP was reported, where NaOH and Na2CO3 were added into the precursor to increase its pH.
Abstract: The present investigation reports the first-time successful synthesis of AuNPs using a new precursor salt of Au(III) acetate through USP. An aqueous solution of this salt was prepared with very limited solubility with H2O. HCl and HNO3 were then added separately to increase the solubility, resulting in a clear, yellowish solution. This enabled the successful formation of AuNPs with USP. In order to improve AuNPs synthesis, NaOH and Na2CO3 were added into the precursor to increase its pH (6–7). With such approach, it was possible to perform USP synthesis using varying concentrations of [Au] in the precursor. Evaporation and reaction temperatures (100 and 300 °C) of USP were chosen based on detected decomposition temperatures of Au(III) acetate with TGA-DT. TEM confirmed the presence of circular shaped, unagglomerated AuNPs having an Fm-3m space group with diameter range of 15–30 and circularity value range of 0.89–0.92. The UV–Vis spectroscopy showed absorbance peaks at 528 and 532 nm. ICP-MS indicated the highest concentration of AuNPs, 79 ppm, by the precursor with the lower initial concentration of [Au]. This could be due to the smallest sedimentation and turbulent losses of larger AuNPs in transport tubes and reaction USP zones.

20 citations