rdeleon_publications_2011-2019.docx

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Publications of Rizalinda L. de Leon, PhD

Bioethanol production from the macroalgae Sargassum spp.

MG Borines, RL de Leon, JL Cuello - Bioresource technology, 2013 - Elsevier

Macroalgae, an abundant and carbon-neutral renewable resource, with several species rich in

carbohydrates are suitable for bioethanol production. This study focused on the pretreatment, enzyme saccharification and fermentation of Sargassum spp., a brown …

Cited by 156Related articlesAll 12 versions

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academia.edu

Ultrafast and stable hydrogen generation from sodium borohydride in methanol and water over Fe–B nanoparticles

JD Ocon, TN Tuan, Y Yi, RL de Leon, JK Lee… - Journal of power …, 2013 - Elsevier

Use of environmentally friendly hydrogen as fuel on a massive scale requires efficient storage and generation systems. Chemical hydrides, such as sodium borohydride (NaBH 4), have the capacity to meet these needs as demonstrated by its high hydrogen storage …

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scielo.br

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Properties of silica from rice husk and rice husk ash and their utilization for zeolite Y synthesis

JJF Saceda, RL Leon, K Rintramee… - Quimica …, 2011 - SciELO Brasil

This study compared properties of silica (SiO2) from rice husk (RH) and rice husk ash (RHA) extracted by acid-and heat-treatment. The SiO2 from RH was in amorphous phase with nearly 100% purity while that from RHA was in crystalline phase with 97.56% purity. Both …

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murdoch.edu.au

Integrated macroalgae production for sustainable bioethanol, aquaculture and agriculture in Pacific island nations

MG Borines, MP McHenry… - Biofuels, Bioproducts and …, 2011 - Wiley Online Library

Abstract The Philippine Biofuels Act of 2006 mandates domestic gasoline blending with bioethanol at a rate of 5% by 2009 and 2010, and 10% by 2011 (by volume). Akin to most biofuel policies, the Act aims to increase fuel supply security, reduce emissions, and …

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academia.edu

Properties of zeolite Y in various forms and utilization as catalysts or supports for cerium oxide in ethanol oxidation

JJF Saceda, K Rintramee, S Khabuanchalad… - Journal of Industrial and …, 2012 - Elsevier Zeolite Y in sodium form (NaY) was synthesized using silica source from rice husk, transformed to ammonium form (NH 4 Y), and calcined to convert to proton form (HY). The direct conversion of NH 4 Y to HY resulted in loss of the zeolite crystallinity and lower …

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Realization of active species in potassium catalysts on zeolite NaY prepared by ultrasound-assisted impregnation with acetate buffer and improved performance in …

S Rakmae, C Keawkumay, N Osakoo, KD Montalbo… - Fuel, 2016 - Elsevier

The goal of this work was to characterize active species in potassium catalysts supported on zeolite NaY prepared by ultrasound-assisted impregnation with acetate buffer (K/NaY-U). A catalyst from conventional impregnation (K/NaY) was also prepared for comparison. The …

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sciencedirect.com

Carotid artery modeling using the navier-stokes equations for an incompressible, newtonian and axisymmetric flow

JJR Fojas, RL De Leon - APCBEE procedia, 2013 - Elsevier

This paper describes two-dimensional (2D) structural and hemodynamics model of the carotid artery and its bifurcation using computational software (CS). The Arbitrary Lagrangian Eulerian (ALE), which was introduced in a finite element system, was utilized as …

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ijcea.org

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Intrinsic kinetic modeling of hydrogen production by

photocatalytic water splitting using cadmium zinc sulfide catalyst

HMG Tambago, RL de Leon - Int. J. Chem. Eng. Appl, 2015 - ijcea.org

Photocatalytic water splitting is an alternative method for hydrogen production. Cadmium zinc sulfide is a photocatalyst active under visible light that is effective for hydrogen generation in the presence of sulfide and sulfite as sacrificial reagents. Design of …

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researchgate.net

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A comparison between the performance of s. cerevisiae cells immobilized in Nata De Coco biocellulose and calcium alginate during continuous bioethanol …

CM Montealegre, ER Dionisio, LV Sumera… - … Journal of Chemical …, 2012 - researchgate.net Saccharomyces cerevisiae cells are compared in terms of production rate and conversion. S. cerevisiae cells are immobilized in NDC and CA beads using a cell suspension with an average approximate live cell density of 232.1±1.5 cells/mL. The biocatalysts NDC and CA …

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researchgate.net

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Continuous bioethanol production using Saccharomyces cerevisiae cells immobilized in nata de coco (biocellulose)

CM Montealegre, ER Dionisio, LV Sumera… - … on Environment and …, 2012 - researchgate.net The performance of Nata de coco (NDC) and Calcium alginate (CA) as an immobilization medium for Saccharomyces cerevisiae cells are compared in terms of production rate and conversion. S. cerevisiae cells are immobilized in NDC and CA beads using a cell …

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Growth, lipid content, and lipid profile of the green alga, Chlorella vulgaris beij., under different concentrations of Fe and CO2

RB Carpio, RL De Leon… - J Eng Sci Technol, 2015 - jestec.taylors.edu.my

Abstract The effects of Fe+ 3 (2.4 E-05 and 4.8 E-05 mol/L) in the growth medium, and CO2 in air (0.036, 1, and 2%) on the growth, total lipid content (TLC), total lipid production (TLP) and fatty acid (FA) profile of the green alga, Chlorella vulgaris Beij., were investigated, in …

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scielo.br

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Characterization and catalytic performance of potassium loaded on rice husk silica and zeolite nay for transesterification of jatropha seed oil

KD Montalbo, RL Leon, O Sophiphun, S Manadee… - Química …, 2013 - SciELO Brasil

Rice husk silica (RHS) and NaY were used as supports for potassium (K) prepared from acetate buffer (B) and acetate (A) solutions. K loading did not destroy the NaY structure, but it caused a decrease in the surface area; the K species resided in micropores and on the …

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sciencedirect.com

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Effect of Blumea balsamifera extract on the phase and morphology of calcium oxalate crystals

CM Montealegre, RL De Leon - Asian journal of urology, 2017 - Elsevier

Objective Calcium oxalate crystals are found in majority of kidney stones with calcium oxalate

monohydrate (COM) as one of the primary types of kidney stones. Various methods of treatment exist, including herbal treatment in the Philippines that uses the medicinal herb …

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matec-conferences.org

Blumea balsamifera (Sambong) tea as a therapeutic drink for calcium oxalate stones

CM Montealegre, RL De Leon - MATEC Web of …, 2016 - matec-conferences.org

Calcium oxalate stones are among the most prevalent type of kidney stones. Methods of treatment range from surgical removal, shockwave lithotripsy, medical and natural treatment. In the Philippines,

consuming tea preparation of Blumea balsamifera is believed to aid in the …

Characterization and thermal decomposition of demineralized wastewater algae biomass

RB Carpio, Y Zhang, CT Kuo, WT Chen, LC Schideman… - Algal research, 2019 - Elsevier

Demineralization pretreatments by leaching using different solvents including deionized water (DI-H 2 O), acetic acid, formic acid, and sulfuric acid were evaluated for their ash removal efficiency and effects on the physical structure, chemical composition and thermal …

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semanticscholar.org

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Effects of irradiation to morphological, physicochemical and biocompatibility properties of carrageenan

JJR Fojas, RL De Leon… - World Acad Sci Eng …, 2013 - pdfs.semanticscholar.org

The characterization of κ-carrageenan could provide a better understanding of its functions in biological, medical and industrial applications. Chemical and physical analyses of carrageenan from seaweeds, Euchema cottonii L., were done to offer information on its …

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murdoch.edu.au

Emission reduction theory and results in the development of a suitable small-scale, portable, continuous rice husk carboniser for poor rural regions in transitional …

RF Orge, MP McHenry, RL de Leon - 2013 - researchrepository.murdoch.edu.au

This chapter describes the process of developing a new rice husk conversion technology suitable to the local requirements of rice farmer in poor rural areas of the Philippines. The small-scale, portable, continuous carboniser was designed to enable heat extraction …

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semanticscholar.org

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Parametric study of rice husk torrefaction for the development of sustainable solid fuel

MTA Banta, RL De Leon - International Journal of Smart …, 2018 - pdfs.semanticscholar.org

Torrefaction is the thermal treatment of lignocellulosic biomass at temperatures between 200 C to 300 C under inert or low oxygen environment. This process produces a dark brown, brittle substance that is hydrophobic, has high energy density, and less prone to biological …

Investigation on the Capacitive Deionization of functionalized carbon nanotubes (f-CNTs) and silver-decorated f-CNTs

KAL Sablan, JD Ocon, J Lee… - … and Development for …, 2015 - conference.upd.edu.ph

The impending water shortage drives us to find alternative sources of water. One of the possible solutions is desalination of seawater. Capacitive deionization is a relatively new technique for desalination. It utilizes the electric double layer for ion adsorption. Carbon …

Synthesis and Characterization of a Polymer Matrix of

Carrageenan, Chitosan and Hyaluronan on Stainless Steel 316L

JJ Fojas, RL De Leon - Key Engineering Materials, 2019 - Trans Tech Publ

Article Preview Article Preview Article Preview A novel bioactive coating matrix consisting of three biopolymers–carrageenan, chitosan, and hyaluronan, was synthesized via alternate layer-by-layer (LbL) self-assembly of the oppositely-charged polyelectrolytes on a 316 L SS …

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Production of Peptone From Chicken Feathers

BNF Subosa, JS Mirando, APV Velasquez… - Philippine …, 2016 - tmc.upd.edu.ph

Peptones are the product of a protein hydrolysis, which serve as the main nutrient source for bacteria in a culture media. This study aimed to provide a locally feasible process for peptone production. Optimization results for Phase 1 showed that a temperature of 90 C, a …

academia.edu

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Calibration of a Rule-Based Computational Model of Photocatalytic Hydrogen Production using Cadmium Sulfide Catalyst with Sulfide and Sulfite Reagents

RVL Canseco, VP Bongolan, HMG Tambago… - academia.edu

A two dimensional agent-based program was created based on the form of the kinetic equations for the reactions in visible light-driven hydrogen production. Programmed agents represent the chemical species involved allowing visual and animated feedback on the …

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semanticscholar.org

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Theory-derived law of the wall for parallel flat-plates turbulent flow.

JD Ocon, L Jirkovsky, RL de Leon… - CFD Letters, 2012 - pdfs.semanticscholar.org

It is well known that in a turbulent flow between two parallel flat plates, the horizontal mean velocity varies logarithmically with height (the so-called'logarithmic-law-of-thewall'). The law of the wall is a description of the mean velocity profile in wall bounded flows and has been …

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upd.edu.ph

PHOTOCATALYTIC HYDROGEN PRODUCTION USING CLINOPTILOLITE-SUPPORTED, EOSIN Y-SENSITIZED TIO2 FOR WATER SPLITTING

JM Tumamao, JO Novilla, ECJ Azurin… - Philippine Engineering …, 2012 - tmc.upd.edu.ph

This research aims to explore the possibility of producing hydrogen as an alternative fuel source through photocatalytic water splitting. It also seeks to synthesize a clinoptilolite-supported, Eosin Ysensitized photocatalyst and test its activity in producing hydrogen in the …

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Performance Evaluation of Gamma-Ray Radiation and Ultraviolet Light Photocatalytic Pretreatments of Sargassum Algae

PISD Halal, RL de Leon

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Comparison of Layer-Forming and Bromine-Doping Methods of Pentacene Layer in Solid-State Dye-Sensitized Solar Cell

DAC Camacho, RL De Leon - Key Engineering Materials, 2017 - Trans Tech Publ

Article Preview Article Preview Article Preview For organic solar cells (OSC) such as dye-sensitized cell (DSSC) to compete with silicon-based cells in terms of stability, there is a need to further improve components which causes degradation. To answer the stability …

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upd.edu.ph

HEAT AND MASS TRANSFER IN AN ADSORPTION PANEL WITH ROD FINS HEATED BY A RADIANT SOURCE: 3D

MATHEMATICAL MODEL

RL de Leon, AB Cortes, RQ Chu - Philippine Engineering Journal, 2013 - tmc.upd.edu.ph

A 3-D modified equilibrium, static-bed model of adsorption in an adsorption panel with rod fins heated by a radiant heat source is developed and solved using the Method of Lines. The energy equation is transformed to have only one dependent variable hence the …

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ijsgce.com

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Torrefied Cogon grass: Effects of torrefaction on fuel properties of solid and condensate products

AG Palanca, RL De Leon, WI Jose - ijsgce.com

Torrefaction is a thermal pretreatment process used to produce solid fuel by heating biomass below 300 C under anoxic conditions. This pretreatment process improves the fuel characteristics of Cogon grass, and its energy density was comparable to that of sub …

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semanticscholar.org

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Synthesis, Characterization and Liquid-Carrying Capacity of Zeolitic Material from Circulating Fluidized Bed Fly Ash

JV Ranoco, JCJG Quintos… - International Journal of …, 2016 - pdfs.semanticscholar.org

With the growing awareness on the environmental impact of coal-burning, conventional Pulverized Coal- fired (PC) boilers are increasingly being replaced with Circulating Fluidized Bed (CFB) boilers. This shift in technology however, has brought about a new environmental …

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Photocatalytic Hydrogen Production from Seawater Using CdxZn1-xS

EDD Jose, ENL Nogales… - International …, 2017 - pdfs.semanticscholar.org

Hydrogen gas has been shown to photocatalytically generated from pure water. With saltwater comprising 93% of the earth's water reservoir, methods to produce hydrogen from seawater minus the expensive water purification are desired. Cd0. 8Zn0. 2S has been …

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upd.edu.ph

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Effect of Blumea Balsamifera Extract in the Kinetics of Calcium Oxalate Crystallisation

CM Montealegre, AC Ilao, RVT Mendoza… - Chemical …, 2017 - dir.coe.upd.edu.ph

Calcium oxalate stones comprise a large number of kidney stone cases. Kidney stone treatment with medicinal herbs such as Blumea balsamifera (B. balsamifera) had been practiced traditionally. In this study, the effect of B. balsamifera extract on the crystallisation …

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ijsgce.com

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Influence of potassium carbonate (K2CO3) as catalyst on biocrude oil yield and properties via hydrothermal liquefaction of Spirulina platensis

CLV Chao, RB Carpio, KJR Yap - ijsgce.com

Page 1. International Journal of Smart Grid and Clean Energy * Manuscript received November 11, 2017;

revised January 2, 2018. Corresponding author. Tel.: +632-932-558-54-55; E-mail address:

[email protected]. doi: 10.12720/sgce.7.1.42-47 …

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Effects of temperature and reaction time on yield and properties of biocrude oil produced by hydrothermal liquefaction of Spirulina platensis

WS Villaver, RB Carpio, KJ Yap - ijsgce.com

Page 1. International Journal of Smart Grid and Clean Energy * Manuscript received August 15, 2017;

revised December 20, 2017. Corresponding author. E-mail address: [email protected]. doi:

10.12720/sgce.7.1.32-41 …

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