Design of a selective solid acid catalyst for the optimization of glucose production from Oryza sativa straw

Victor, Amudhavalli; Pulidindi, Indra Neel; Kim, Tae Hyun; Gedanken, Aharon

doi:10.1039/c5ra20121g

Cited by 14 publications

(5 citation statements)

References 40 publications

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“…(680 W, 24 min, water) [24]; glucose yields of 11.2% (100° C, 5 min, solid acid catalyst) [28]; total sugar yields of 71.41% (230 W, 5 min, acetic acid) and 80.08% (230 W, 5 min, propionic acid) [29]; glucose yields of 65% (700 W, 30 min, 1 % NaOH) [30]; total sugar yields of 10 -19% (160° C, 15 min, 1% H2SO4), 18-40% (160° C, 15 min, 1% NaOH) and 9-14% (160° C, 15 min, water) depending on rice variety [31]. Microwave hydrothermal extraction at low severity (100° C, 5 min, water) has also been used to extract bioactive compounds from black rice Chakhao Poireiton straw [16].…”

Section: Introductionmentioning

confidence: 99%

Microwave subcritical water pre-treatment and enzymatic hydrolysis of geographical identification (GI) tag Indian black rice (Chakhao Poireiton) straw for fermentable sugar production

Moirangthem¹,

Zaky²,

Tucker³

2021

Biofuels

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Rice straw is an important feedstock for second-generation biorefineries, the majority being conventional white rice. This research investigated the potential of the straw of black rice Chakhao Poireiton, a rice variety of increasing importance, for biorefining. Pre-treatment of black rice straw was carried out in a pressurized microwave reactor and free sugar release was measured following digestion with Cellic® CTec3. This was compared to white rice straw. Pre-treatment (100 -200° C for 5 min) did not drastically impact the sugar composition but brought about an enhanced release of glucose after enzymatic hydrolysis from 25 to 50% (black rice) and from 26 to 55% (white rice). For xylose digestibility, the increase was around seven-fold for black rice (8 to 57%) and five-fold for white rice (13 to 64%). This improvement in digestibility of the straw samples could have come from modification in the lignocellulose structural features making the polysaccharides more susceptible to hydrolysis. Black rice could be a suitable feedstock for a combined biorefinery -food and nutraceuticals from grain (much higher than white rice) and the straw for fermentable sugars comparable to white rice straw for biofuels.

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Section: Introductionmentioning

confidence: 99%

Microwave subcritical water pre-treatment and enzymatic hydrolysis of geographical identification (GI) tag Indian black rice (Chakhao Poireiton) straw for fermentable sugar production

Moirangthem¹,

Zaky²,

Tucker³

2021

Biofuels

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“…Glucose, sucrose, starch (from potato), and cellulose (Avicel PH-101, 99.8%) were purchased from Sigma-Aldrich. Pretreated rice straw was provided by Professor T. H. Kim, South Korea . Ethanol and isopropanol (99.7%) were purchased from Daejung Chemicals & Metals Co., South Korea.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The focus of the present work is to design a novel Ga-based heteropoly acid catalyst using the sonochemical method and to exploit the catalyst for the production of LA from biomass (glucose, starch, cellulose, and rice straw). 32 Ethanol and isopropanol (99.7%) were purchased from Daejung Chemicals & Metals Co., South Korea. All reagents were used without further purification.…”

Section: Introductionmentioning

confidence: 99%

Development of Ga Salt of Molybdophosphoric Acid for Biomass Conversion to Levulinic Acid

et al. 2016

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Efficient catalytic methods for biomass conversion present a challenge for the sustainable production of fuels and chemicals. Ga salt of molydophosphoric acid (GaHPMo) is prepared using a sonochemical irradiation method. Simultaneous formation of GaHPMo and entrapment of polyoxometallate in gallium micro-/nanoparticles (Ga@HPMo) is achieved. The amount of entrapped hetropoly acid in Ga particles is estimated to be ∼3 wt %, as determined from thermogravimetric analysis (TGA) and ultraviolet−visible (UV−vis) analysis. The preparation of GaHPMo is accomplished by subjecting an ethanolic solution of polyoxometallate [molybdophosphoric acid (HPMo)] and molten Ga metal to sonication at 50 °C for 12 min. Physicochemical properties of GaHPMo are studied using X-ray diffraction, TGA, temperature-programmed desorption, differential scanning calorimetry, Fourier transform infrared spectroscopy, UV−vis spectroscopy, scanning electron microscopy, transmission electron microscopy, dynamic light scattering, and energy-dispersive X-ray spectroscopy analysis. GaHPMo was successfully used as a catalyst for the conversion of various carbohydrates (glucose, starch, and cellulose) and rice straw into levulinic acid via a hydrothermal process. Reaction conditions for obtaining an optimum yield of levulinic acid from glucose are deduced (time, 10 h; temperature, 423 K; and mole ratio of the catalyst/reactant, 1:5). The reaction products are analyzed qualitatively using nuclear magnetic resonance ( 13 C and 1 H) spectroscopy and quantified using high-performance liquid chromatography analysis. The maximum yield of levulinic acid obtained from glucose is 56 wt %. Apart from the major product, levulinic acid, other minor byproducts, such as formic and lactic acids, are also observed.

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“…The molecule's electronic properties greatly influence the factors that govern the efficiency of dye sensitizers, such as charge transport, photo-excitation, and electron injection. Thus, it is necessary to have a fundamental understanding of the electronic structures of the dye molecule to understand the charge separation and electron transfer separation mechanism [48,49].…”

Section: Introductionmentioning

confidence: 99%

Insights from Density Functional Theory on the Feasibility of Modified Reactive Dyes as Dye Sensitizers in Dye-Sensitized Solar Cell Applications

Dindorkar¹,

Yadav

2022

Solar

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Recently, reactive dyes have attracted a lot of attention for dye-sensitized solar cell applications. This study endeavors to design dye sensitizers with enhanced efficiency for photovoltaic cells by modifying the reactive blue 5 (RB 5) and reactive brown 10 (RB 10) dyes. Three different strategies were used to design the sensitizers, and their efficiency was compared using the density functional theory (DFT). The optimized geometry, bang gap values, the density of states, electrostatic potential surface analysis, and theoretical FT-IR absorption spectra of the sensitizers were obtained. In the first strategy, functional groups (electron-donating (C2H5), electron-withdrawing (–NO2) groups) were anchored onto dye molecules, and their effect on the charge transport properties was evaluated using the DFT analysis. The latter two designs were based on a donor-π-acceptor strategy. The second design consisted of intramolecular donor-acceptor regions separated by a benzodithiophene-based π-spacer. In the third strategy, an external acceptor unit was attached to the dye molecules through the benzodithiophene-based π-spacer. The electron-donating strengths of donor moieties in the donor-π-acceptor systems were studied using B3LYP/6-31G level DFT calculations. The quantum chemical analysis of the three designs revealed that the anchoring of functional groups (–NO2 and C2H5) on the dye molecules showed no impact on the charge transport properties. The introduction of a benzodithiophene-based π-spacer improved the conjugation of the dye sensitizers, which enhanced the electron transport properties. The electron transport properties further improved when an external acceptor unit was attached to the dye molecule containing a π-spacer. It was thus concluded that attaching an external acceptor unit to the donor dye molecule containing a π-spacer produced desired results for both of the dyes.

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Design of a selective solid acid catalyst for the optimization of glucose production from Oryza sativa straw

Abstract: A selective, green and fast method for the production of glucose from rice (Oryza sativa) straw is demonstrated.

Cited by 14 publications

References 40 publications

Microwave subcritical water pre-treatment and enzymatic hydrolysis of geographical identification (GI) tag Indian black rice (Chakhao Poireiton) straw for fermentable sugar production

Microwave subcritical water pre-treatment and enzymatic hydrolysis of geographical identification (GI) tag Indian black rice (Chakhao Poireiton) straw for fermentable sugar production

Development of Ga Salt of Molybdophosphoric Acid for Biomass Conversion to Levulinic Acid

Insights from Density Functional Theory on the Feasibility of Modified Reactive Dyes as Dye Sensitizers in Dye-Sensitized Solar Cell Applications

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