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Beltran, Arnel B.,Nisola, Grace M.,Choi, Shin Sik,Kim, Younghee,Chung, Wook‐,Jin John Wiley Sons, Ltd 2013 Journal of chemical technology and biotechnology Vol.88 No.12
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P><B>Hybrid materials are being developed with improved separation properties as pervaporation (PV) membranes. Mixed matrix membranes (MMMs) containing surface‐functionalized fumed silica (SiO<SUB>2</SUB>) nanoparticles in polydimethylsiloxane (PDMS) were investigated for PV recovery of 1‐butanol. The MMMs were characterized through water contact angle, pure 1‐butanol sorption, degree of swelling and 1‐butanol partition coefficients</B>.</P><P><B>Results</B></P><P><B>Most MMMs outperformed pure PDMS for the PV of 1.5% (w/v) 1‐butanol at ≤40°C. Functionalized SiO<SUB>2</SUB> fillers enhanced the affinity of 1‐butanol to the MMMs (K<SUB>BuOH</SUB><SUP>G</SUP>) which consequently improved 1‐butanol permeability more than that of water. Thus the MMMs exhibited better separation efficiencies, but those with octyl‐functionalized (Si‐DMOS) and phenyl‐functionalized SiO<SUB>2</SUB> (Si‐DMPS) exhibited the best PV performance. Filler loading of 10 wt% Si‐DMOS and Si‐DMPS were found optimal for the PV performance of both MMMs. With temperature, component fluxes of both MMMs increased whereas permeability decreased. Based on PV separation index, both MMMs performed better than PDMS at ≤60°C, Si‐DMPS/PDMS MMM outperformed PDMS even at 70 °C</B>.</P><P><B>CONCLUSION</B></P><P><B>Improved performance of PV membranes was achieved when nonporous functionalized SiO<SUB>2</SUB> nanoparticles, especially when Si‐DMPS is used as the filler. The MMMs developed may also be useful for organic compounds recovery from dilute aqueous solutions. © 2013 Society of Chemical Industry</B></P>
Arnel B. Beltran,정욱진,Grace M. Nisola,Eleazer L. Vivas,조원회 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Supported liquid membranes (SLM) composed of oleyl alcohol (OA) and poly(octylmethylsiloxane)(POMS) in microporous flat sheets were investigated for the pervaporation of 1-butanol. Water contact angle and partition coefficients were used to characterize the SLMs. Optimum pervaporation performance was attained at 30 wt% OA SLM wherein high separation factor (a = 279) and total flux (JT = 95.9 g/(m2 h)) were achieved from 2.5% (w/v) 1-butanol/water feed, at 60 8C. In these conditions,27% reduction in JT was observed when fed with model fermentation broths but remained highly selective toward 1-butanol (a = 76.4). SLM stability was demonstrated with <4% LM loss after operation.
Ramon Christian P. Eusebio,Bernard Jomari B. Razote,Hannah Jelsy T. Del Pilar,Richard D. Alorro,Arnel B. Beltran,Aileen H. Orbecido 한국자원공학회 2020 Geosystem engineering Vol.23 No.4
The potential utilization of waste rock obtained from an active nickel mine site in Mindanao, the Philippines for indirect carbon sequestration is explored in this study. X-ray diffraction (XRD), X-ray fluorescence (XRF), and inductively coupled plasma optical emission spectroscopy (ICP-OES) results showed that the sample is rich in iron, existing in three different forms: goethite (α-FeOOH), chromite (FeCr2O4), and magnetite (Fe3O4). Leaching tests performed using hydrochloric acid (HCl) showed high iron extraction rates, with a maximum average extraction efficiency of 95.35% obtained at 100°C, 4 M HCl, and 1.0 h. Morphological and physicochemical analyses conducted through scanning electron microscopy and Brunauer–Emmett–Teller (BET) method supported the high extraction rates obtained for Fe, which is due to the higher reactivity of the sample to the leaching agent as well as the higher availability of accessible sites for reaction on the sample surface as compared to other mine wastes that are previously utilized. The nickel laterite waste rock sample has the potential to be used as a feedstock for iron carbonation in indirect carbon sequestration; however, challenges such as the use of sulfide source and cost requirements must be addressed in order to fully determine its viability for industrial scale application.