Use of coir fiber and analysis of geotechnical properties of soil

Kaushik, Deepak; Singh, Sitesh Kumar

doi:10.1016/j.matpr.2021.05.255

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Batch experiments to study the adsorption CV and MO dyes on AFs aerogels were performed with various parameters such as contact time (0-90 mins), initial dye concentration (12.5-100 mg/L), pH (3)(4)(5)(6)(7)(8)(9)(10)(11), and temperature (303-333 K). The pH value of the dye solution was adjusted with 0.01 M NaOH or 0.01 M HCl solutions, which were measured using a pH Mettler Toledo SevenDirect SD20 (Switzerland).…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…The pH of the dye solution is considered a secondary but crucial factor in governing the adsorption process. The study covered a pH range from acidic to basic conditions (3)(4)(5)(6)(7)(8)(9)(10)(11), with results illustrated in Figure 5a. For the cationic dyes MB and CV, the adsorption capacity experiences a substantial increase as pH values rise from 3 to 7.…”

Section: Effect Of Phmentioning

confidence: 99%

“…Recently, scientific communities have been increasingly interested in using cellulose which is a potential biopolymer with abundant renewable resources on Earth from various agricultural wastes to prepare aerogel for wastewater-containing dye treatment such as coir [5,6], pineapple leaf [7,8], sugarcane bagasse [9], and rice straw [10]. Coconut fibrils, which are one of the strongest, toughest, and hardest natural fibers with cellulose content (43.44%) [11], are evaluated as agro-waste with significant economic value on a global scale; however, these are commonly burned, which results in a detrimental effect on the environment. Therefore, coconut fibrils are recognized as a potential candidate for developing cellulose-based aerogels for all the above-mentioned engines.…”

Section: Introductionmentioning

confidence: 99%

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Flexible aerogel composites for the elimination of crystal violet and methyl orange

Nguyen,

Pham,

Nguyen

et al. 2024

Preprint

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The application of porous aerogels for dye adsorption has proven to be an effective approach in wastewater treatment. In this study, bio-cellulose aerogels from coconut fibrils were successfully developed via the formation of physically cross-linking cellulose with non-toxic binders (polyvinyl alcohol (PVA) and xanthan gum (XTG)) after a freeze-drying technique. The resulting cellulose aerogel demonstrated remarkably low density (27.59–47.76 g/cm3), high porosity (> 96.0%), a specific surface area of 518.01 m2/g, and a desorption average pore diameter distribution of 3.77 nm. These aerogels were tested for crystal violet (CV) and methyl orange (MO) adsorption to evaluate their effectiveness in treating dye-polluted water via various conditions such as contact time, pH values, initial concentrations, and temperature. The dye adsorption process reached equilibrium after approx. 30 mins and strictly followed pseudo-second-order and the Redlich-Peterson model. FT-IR and SEM-EDX analyses proved that the adsorption mechanism is primarily ascribed to the hydrogen bonding, electrostatic, π-π, and Vander Waals interactions between aerogel and dye molecules. The eco-friendly synthesis of recycled cellulose aerogels from coconut fibrils using green chemicals holds great promise for dye elimination.

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Section: Adsorption Experimentsmentioning

confidence: 99%

Section: Effect Of Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexible aerogel composites for the elimination of crystal violet and methyl orange

Nguyen,

Pham,

Nguyen

et al. 2024

Preprint

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“…Sharma et al (2017) [13] conducted a number of unconfined compression tests on natural fiber-reinforced soil. Kaushik and Singh (2021) [14] demonstrated that the reinforcement of the subgrade soil with coir fiber significantly improves the California Bearing Ratio (CBR). Studies that investigated the effect of fiber reinforcement on clay soils were limited compared to sandy soils.…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of Clay Soil Reinforced with Natural Fibers

Abood¹,

Shakir²

2023

BJES

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The trend of using natural fibers in geotechnical engineering has become of great interest to improve weak soils due to some of its advantages such as local availability, environmental friendliness, and lower cost. In this study, a set of unconfined compression strength and direct shear tests were conducted to evaluate the performance of Al-Nasiriya clayey soil reinforced with natural fibers. Three different types of natural fibers were investigated as sustainable ones, including wheat straw fiber and palm frond fiber, as well as imperata cylindrica fiber. The effects of various fiber contents (0.25 %, 0.5 %, 0.75 %, and 1 %) and lengths (20 mm, 30 mm, and 40 mm) were experimentally evaluated. The results indicated that the compressive strength increased significantly with the increase of fiber content and length up to an optimum value and then decreased. The optimum fiber content and length were 0.5 % and 30 mm, respectively. Compared to the unreinforced soil, the compressive strength values at the optimum content and length increased by 102 %, 126 %, and 66 % for samples reinforced with wheat straw, palm fronds, and imperata cylindrica fibers, respectively. The shear properties improved due to soil reinforcement with natural fibers. Compared to the unreinforced soil, the internal friction angle of the samples reinforced with wheat straw, palm fronds, and imperata cylindrica fibers increased by 17.7 %, 42 %, and 9 %, respectively. Forever, the cohesion and shear strength are also improved due to inclusion of natural fibers.

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