Study on properties and durability of alkali activated rice straw fibers cement composites

Feng, Bowen; Liu, Jie‐Sheng; Lü, Zifeng; Zhang, Man; Tan, Xiaoming

doi:10.1016/j.jobe.2022.105515

Cited by 16 publications

(3 citation statements)

References 33 publications

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“…Thus, it has been proved that alkali reduces the recalcitrant nature of the RS by dissolving the cellulose fibers, thereby enhancing cellulose accessibility to enzymes. Previously, Phitsuwan et al (2017) and Feng et al (2023) also obtained similar morphological results for RS. Phitsuwan treated the RS with an ammonia solution.…”

Section: Surface Morphology Analysis By Semsupporting

confidence: 74%

Bioethanol production from alkali-pretreated rice straw: effects on fermentation yield, structural characterization, and ethanol analysis

Ningthoujam,

Jangid,

Yadav

et al. 2023

Front. Bioeng. Biotechnol.

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Current ethanol production technology has a dire need for efficient conversion of lignocellulosic biomass to fermentable sugars. The conversion requires pretreatment of the biomass, one of the most expensive steps, and thus it is quite necessary to identify the most cost-effective and high-efficiency conversion method. In this study, rice straw (RS) biomass was pretreated using 4% NaOH alkali, soaked for 4 h, and autoclaved for 30 min. The structural and morphological changes were examined using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analysis in both native and alkali-treated RS. The FTIR analysis revealed that native RS contains a considerable amount of lignin that was removed after the pretreatment process. The XRD pattern of the RS revealed an increasing crystallite size of the pretreated lignocellulosic biomass. The study of SEM clearly showed the distorted structure and surface porosity after the pretreatment process. Enzymatic hydrolysis efficiency was checked by comparing the commercial enzymes and microbial hydrolysis extracted from a fungal isolate. The best-reducing sugar yield obtained was 0.62 g/L, achieved at optimized conditions from the commercial enzymes. Fermentation efficiency was checked using the yeast isolate Saccharomyces cerevisiae in both the native and pretreated substrate, and the highest ethanol concentration (21.45%) was achieved using 20% w/v biomass loading, enzyme loading (2:1:1), and fermentation for a week at 30°C and pH 4.5. This concentration was higher than that of the untreated RS (3.67%). The ethanol thus produced was further checked for analysis by the 1H and 13C nuclear magnetic resonance (NMR) methods.

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Section: Surface Morphology Analysis By Semsupporting

confidence: 74%

Bioethanol production from alkali-pretreated rice straw: effects on fermentation yield, structural characterization, and ethanol analysis

Ningthoujam,

Jangid,

Yadav

et al. 2023

Front. Bioeng. Biotechnol.

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“…Micromorphological changes were assessed by SEM. As shown in Figure 3a,a1, the surface of pristine RSPs cloaked in a layer of wax and SiO2 was rough without obvious fiber strips [23]. While the surface of alkali-treated RSPs (ATRSPs) exhibited parallel and neatly arranged fiber bundles (Figure 3b,b1) because alkali opened the obstinate structure of the RSPs by removing most of the lignin, hemicellulose, and wax layer, effectively increasing accessibility of the cellulose [24].…”

Section: Sem Images Of Fibersmentioning

confidence: 99%

Capillary-Assisted Monitoring of Milk Freshness via a Porous Cellulose-Based Label with High pH Sensitivity

Liu

Chi

Zhu

et al. 2023

Foods

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A cellulose-based matrix for monitoring milk freshness (MF) was produced from rice straw particles (RSPs) in a 0.125–0.150 mm that was bis-quaternized to attach bromocresol purple (BP) as a sensor. Under alkali conditions, the obstinate structure of the rice straw had opened, thereby improving the accessibility of the cellulose. Bis-quaternization created more adsorption sites for BP. The maximum adsorption capacity was 97.68 mg/g. The sensors were interwoven with cellulosic fibers to form the cellulose-based label with a relatively loose three-dimensional structure via hydrogen bonds. As the proportion of BP-BCRPs was increased from 10% to 40%, the air permeability of the label increased from 3.76 to 15.01 mm/s, which increased the response to the tested gases (10.12 s for 1 mL of acetic acid). The intelligent label exhibited excellent sensitivity at pH values of 3–9 with highly saturated color changes. During the storage period, the label color shifted from blue-purple to yellow as acidity was increased from 17.24 to 19.8 °T due to capillarity action, providing a timely warning to consumers. The prepared colorimetric porous intelligent cellulose-based label is suitable for monitoring of MF.

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“…While there were instances where the compressive strength increased with certain additions of brous materials, overall, it tended to drop as the amount of brous materials increased. In contrast to the effect on compressive strength, the addition of brous materials have a positive in uence on the exural strength of materials [37,39,40]. Awoyera and Akinrinade [41] who investigated the incorporation of rice straw into cement bounded boards, found that the addition of brous materials led to an increase in exural strength.…”

Section: Introductionmentioning

confidence: 99%

Improvement the brittle Resistance of High-Strength Concrete through Palm Leaf Sheath Fibers and Rice Straw Fibers

defalla,

Osama,

Shubbar

et al. 2024

Preprint

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The use of natural fiber waste presents a potential solution to address both environmental problems associated with agricultural waste and the issue of sudden failure in high-strength concrete (HSC). In this research, the effects of incorporating two fiber waste in HSC was investigated. Seven HSC mixes were prepared, including three with Rice Straw Fibers (RSF), three with palm leaf sheath fiber (PLSF), and one control mix without fibers. The volume fractions of the RSF and PLSF used in this research ranged from 1–3%, with an aspect ratio of 100. Several tests were conducted to evaluate the different properties of the HSC this including slump test, compressive strength, tensile strength, flexural strength, and modulus of elasticity, were evaluated all mixtures. Results indicated that the addition of natural fiber did not significantly enhanced the compressive strength, while, the tensile and flexural strength of HSC increased, particularly when incorporating 1% RSF. RSF exhibited a more significant improvement in the properties of HSC when compared to PLSF. However, both types of fibers were effective in strengthening the HSC's brittleness behaviour.

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Study on properties and durability of alkali activated rice straw fibers cement composites

Cited by 16 publications

References 33 publications

Bioethanol production from alkali-pretreated rice straw: effects on fermentation yield, structural characterization, and ethanol analysis

Bioethanol production from alkali-pretreated rice straw: effects on fermentation yield, structural characterization, and ethanol analysis

Capillary-Assisted Monitoring of Milk Freshness via a Porous Cellulose-Based Label with High pH Sensitivity

Improvement the brittle Resistance of High-Strength Concrete through Palm Leaf Sheath Fibers and Rice Straw Fibers

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