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- 저자 : Francisco J. Peñas (검색결과 2 건)
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Kinetic modeling of sorption–desorption cycles for phenol removal with a cyclodextrin polymer
Francisco J. Peñas,Ana Romo,José R. Isasi,María J. San José,Sonia Alvarez 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
This paper examines the long-term application of a cyclodextrin hydrogel sorbent in multiple sorption–desorption cycles. Aqueous phenol was the target pollutant, whilst methanol, ethanol and isopropanolwere chosen as eluents. The experimental results were well described by empirical models: thebreakthrough curves by a two-parameter dose–response equation, and the elution curves by a pulsepeakequation with two independent parameters. The differences in polarity of solvents producedsorbent fragmentation, particularly marked for isopropanol and considerably lower for methanol, andtherefore a progressive increase in mass-transfer coefficients. In addition, a dual approach was developedfrom the proposed breakthrough model to address the mass transport of sorbate within the packed beds. Thefirst one defines an average mass-transfer coefficient as representative for each complete sorptioncycle, whereas a time-profile of this coefficient is deduced in the second method. A sorption capacity of29.6 mg-phenol/g-sorbent was found in the working conditions.
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C?sar Daniel Rivera‑Tello,Francisco Javier Flores‑Ruiz,M. Flores,O. Jimenez,I. Far?as,J. Oseguera‑Pe?a 한국탄소학회 2021 Carbon Letters Vol.31 No.1
This paper presents a Raman spectroscopy study of the influence of methane flow on the micro-tribological behavior of diamond-like carbon coatings deposited with an industrial plasma-enhanced chemical vapor deposition system. Results have shown a direct relationship between the methane flow and thickness of the coatings. The analysis of the Raman spectra and deposition parameters allowed establishing the influence of H content with the methane flow, the disorder level and estimation of the sp3 fraction on the carbon coatings. The micro-tribology tests showed a strong dependence of the wear resistance and hardness with Raman parameters. The coating deposited at 72-sccm methane flow presented a thickness of 1.7 μm and a sp3 fraction of 0.33. This sp3 fraction gave rise to a hardness of 24 GPa and an excellent wear resistance of 3.3 × 10–6 mm3 N?1 mm?1 for this DLC coating. Wear tests showed a swelling in the wear profiles on this coating, which was associated with the occurrence of a re-hybridization process.
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