Multiple response optimization of alkaline pretreatment of sisal fiber (<scp><i>Agave sisalana</i></scp>) assisted by ultrasound

Brito, Jeane Quelle Alves; Dias, Fábio de S.; Cunha, Sílvio; Ramos, Luiz Pereira; Teixeira, Leonardo Sena Gomes

doi:10.1002/btpr.2802

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…This makes it a popular choice for applications in marine environments or areas prone to extreme weather conditions. The alkaline treatment involves soaking the fibers in an alkaline solution, typically sodium hydroxide (NaOH) or potassium hydroxide (KOH) [17]. Here is a general guideline for the chemical treatment: Materials needed for the alkaline treatment of sisal fibers include sisal fibers, 10% NaOH solution for 24 hours -an alkaline solution (sodium hydroxide or potassium hydroxide), and protective equipment (gloves, goggles, etc.).…”

Section: Materials Collection Optimum MIX Design Preparationmentioning

confidence: 99%

A Sustainable Revolution in Sisal Fiber with Enhanced Mechanical Properties of Concrete

Selvam,

Muniyandi,

Jaya

2024

TOCIEJ

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Introduction This study provides a comprehensive comparative analysis of conventional concrete (CC) and Sisal Fiber Concrete (SFC) and incorporates sisal fiber into a concrete blend for the M25 grade concrete mix. Methods In order to evaluate the efficacy of both variations of concrete, mechanical and durability parameters were examined. As compared to CC, the results indicated that SFC had a substantially greater compressive strength. The average compressive strength of SFC at the 28-day was 29.47 N/mm2, which signified a significant incremental percentage growth of 9.58% in comparison to CC. In the same way, SFC exhibited an exceptional flexural strength, as evidenced by its mean value of 7.81 N/mm2, which represented a significant 34.42% improvement in comparison to CC. The Bayesian factor independent sample test yielded a t-test value of 12.495 for compressive strength, accompanied by a p-value below 0.001. These results suggest that the observed difference was statistically significant. Conversely, a t-test value of 19.380 and a p-value below 0.001 were produced by the Bayesian factor independent sample test for flexural strength, both of which further supported the existence of a significant difference. The mean disparity in compressive strength between CC and SFC was 5.1522 N/mm2, with a 95% confidence interval encompassing values between 4.2856 and 6.0188 N/mm2. In a similar manner, the mean discrepancy in flexural strength was 2.0000 N/mm2, accompanied by a 95% confidence interval that varied between 1.7831 and 2.2169 N/mm2. Results The obtained results provide further evidence that SFC is stronger than CC in both compressive and flexural strength, which is consistent with the results obtained from the frequentist statistical analysis. Conclusion With its eco-friendly properties, sisal fiber concrete could indeed play a significant role in the future of sustainable construction.

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Section: Materials Collection Optimum MIX Design Preparationmentioning

confidence: 99%

A Sustainable Revolution in Sisal Fiber with Enhanced Mechanical Properties of Concrete

Selvam,

Muniyandi,

Jaya

2024

TOCIEJ

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“…Interestingly, certain phenolics, such as quercetin glucuronide, rutin, and procyanidin B2 increased in the US-treated samples. In another study, pectin was recovered from sisal (Agave sisalana) waste and the yield values ranged from 14% to 30% depending on the ultrasonic power applied [97]. The best conditions were set at 61 W, 50 • C, and 26 min, and allowed the maximum recovery of pectin; beyond 65 W, the yield dropped off due to an excessive bubble formation in the solvent during cavitation, which diminished the efficiency of the US.…”

Section: Ultrasoundmentioning

confidence: 99%

Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

et al. 2021

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Agave, commonly known as “maguey” is an important part of the Mexican tradition and economy, and is mainly used for the production of alcoholic beverages, such as tequila. Industrial exploitation generates by-products, including leaves, bagasse, and fibers, that can be re-valorized. Agave is composed of cellulose, hemicellulose, lignin, fructans, and pectin, as well as simple carbohydrates. Regarding functional properties, fructans content makes agave a potential source of prebiotics with the capability to lower blood glucose and enhance lipid homeostasis when it is incorporated as a prebiotic ingredient in cookies and granola bars. Agave also has phytochemicals, such as saponins and flavonoids, conferring anti-inflammatory, antioxidant, antimicrobial, and anticancer properties, among other benefits. Agave fibers are used for polymer-based composite reinforcement and elaboration, due to their thermo-mechanical properties. Agave bagasse is considered a promising biofuel feedstock, attributed to its high-water efficiency and biomass productivity, as well as its high carbohydrate content. The optimization of physical and chemical pretreatments, enzymatic saccharification and fermentation are key for biofuel production. Emerging technologies, such as ultrasound, can provide an alternative to current pretreatment processes. In conclusion, agaves are a rich source of by-products with a wide range of potential industrial applications, therefore novel processing methods are being explored for a sustainable re-valorization of these residues.

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“…However, the modeling and simulation processes are useful tools for decision making, since they allow us to study the behavior of the process, as well as to evaluate and compare the impacts of operational conditions [22]. Also, it is essential to multivariate analysis, based on statistics, to determine which independent variables most affect the process, as well as to generate mathematical models to assess operational conditions [23]. In this work, multivariate statistical analysis was used to determine the energy self-sufficiency conditions of the ethanol autothermal reform.…”

Section: Introductionmentioning

confidence: 99%

Energy Self-Sufficiency Conditions of Ethanol Autothermal Reforming: a Simulation Study

Brito

Maraes

Santos

et al. 2021

Braz. arch. biol. technol.

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Natural gas steam reforming is commonly used for hydrogen production. However, research has shown that ethanol autothermal reforming can produce cleaner hydrogen gas efficiently. Despite this, there is a lack of studies on the energy self-sufficiency conditions of the ethanol autothermal reform. In this paper, we use simulations and the Response Surface Methodology (RSM) for the multivariate analysis of the energy self-sufficiency conditions in this process. First, we constructed and validated an industrial flowchart. After that, RSM allowed us to assess the process variables effects. The process variables studied were temperature (0 to 1000 ºC), pressure (20 to 30 bar), steam/ethanol ratio (2 to 5 mol/mol) and O2/ethanol ratio (0 to 1.5 mol/mol). We observe that the temperature and steam/ethanol ratio increase have a positive effect on hydrogen production. On the contrary, the O2/ethanol ratio increase has a negative effect, and the pressure increase is not statistically significant on hydrogen production. Therefore, the pressure was used at its minimum level (20 bar) while the temperature and the steam/ethanol ratio at its maximum levels (1000 ºC and 5 mol/mol). We also evaluated the energy consumption for the Autothermal Reactor (ATR). The reactor consumed 477.92 kJ/mol ethanol to produce 5.12 mol H2/mol ethanol when we use 1000 ºC, 20 bar, steam/ethanol 5 mol/mol, and O2/ethanol 0 mol/mol. ATR's energy self-sufficiency is achieved by using 1000 ºC, 20 bar, steam/ethanol 5 mol/mol, and O2/ethanol 0.86 mol/mol. In these conditions, 3.95 mol H2/mol ethanol is produced with 0 kJ/mol ethanol. HIGHLIGHTS• Pressure is not statistically significant for ethanol autothermal reforming.• Temperature and steam/ethanol ratio have a positive effect on hydrogen production.• Autothermal Reactor can achieve energy self-sufficiency.2 Brito, M.L.; et al.

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Multiple response optimization of alkaline pretreatment of sisal fiber (Agave sisalana) assisted by ultrasound

Cited by 11 publications

References 28 publications

A Sustainable Revolution in Sisal Fiber with Enhanced Mechanical Properties of Concrete

A Sustainable Revolution in Sisal Fiber with Enhanced Mechanical Properties of Concrete

Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

Energy Self-Sufficiency Conditions of Ethanol Autothermal Reforming: a Simulation Study

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