Valorization of rice husk silica waste: Organo-amine functionalized castor oil templated mesoporous silicas for biofuels synthesis

Elimbinzi, Elianaso; Nyandoro, Stephen S.; Mubofu, Egid B.; Manayil, Jinesh C.; Lee, Adam F.; Wilson, Karen

doi:10.1016/j.micromeso.2019.109868

Cited by 20 publications

(12 citation statements)

References 51 publications

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“…However, these values are high in silica from RH (37.5 m 2 /g and 0.08 cc/g). The specific surface area values obtained by the BET method were relatively smaller in this study than the reported method from agricultural biomass. − However, the obtained pore radius and pore volume were in a similar range to that reported in the literature. The observed smaller surface area could be ash impurity in the silica because the samples were directly analyzed without purification.…”

Section: Results and Discussionsupporting

confidence: 80%

“…The diameter of the SNPs was also evaluated, and grain sizes were different among the samples, in which the SNPs sizes ranged from 100 to 350 nm, 40 to 130 nm, and 10 to 70 nm in PS, RH, and SB, respectively (Figure S6d–f). The shape of the SNPs was different among the studied samples in which RH-derived SNPs exhibited a coral sponge-like appearance comprised of fused agglomerates of spherical structure . It could be seen that particles are spherical, and some of the particles were agglomerated in PS-derived SNPs (see Figure f).…”

Section: Results and Discussionsupporting

confidence: 67%

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Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts

Shahi

Wang

Adhikari

et al. 2021

ACS Sustainable Chem. Eng.

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Agricultural byproducts rich in lignocellulose are considered one of the most promising feedstocks to produce sustainable value-added materials with different industrial applications. However, fractionation into carbohydrates, lignin, and silica is a key challenge in the conversion of plant biomass into value-added products due to its complex structure. This study is designed to develop a novel method for sequential separation and collection of cellulose, hemicellulose, lignin, and silica from agricultural byproducts, peanut shell (PS), rice husk (RH), and sugar cane bagasse (SB), using an integrated approach under mild hydrolysis conditions. Silica and cellulose nanofibers (CNFs) were synthesized using an ultrasonic-assisted chemical method. Pure silica was obtained by further pyrolysis. The yield percent of cellulose was 35%, 39%, and 41% and hemicellulose and lignin combined was 30%, 18%, and 29% from PS, RH, and SB, respectively. The X-ray diffraction results demonstrated that CNFs were semicrystalline from all samples, and CNFs from SB had the highest crystallinity. Similarly, silica nanoparticles (SNPs) were amorphous in RH, while it was crystalline in both PS and SB. The surface morphologies of the CNFs and nanosized fibers were observed by field emission-scanning electron microscopy. It revealed that there were different morphological characteristics such as web-like, parallel, and tangled in PS, RH, and SB, respectively. The surface morphology of SNPs was also varied among the samples. In BET analysis, SNPs from RH had a larger specific surface area of 37.5 m 2 /g and total pore volume of 0.08 cc/g compared to SNPs from both PS and SB. The ascribed method could be a potential approach for comprehensive utilization of agricultural biomass through a relatively simple process, which can then be used for the biorefinery process or as a feedstock for the biomaterials industry. It is also suggested that the structural variations of CNFs/SNPs might be a vital factor to be considered for selecting optimal biomaterials.

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Section: Results and Discussionsupporting

confidence: 80%

Section: Results and Discussionsupporting

confidence: 67%

Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts

Shahi

Wang

Adhikari

et al. 2021

ACS Sustainable Chem. Eng.

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“…Nanoengineered Silica particles are widely used for biomedical purposes, in cosmetic products, food industry, automobiles, paints etc. Even rice husk silica waste is also used for the preparation of porous materials [35]. Waste material is a potential alternative source of silica.…”

Section: Silica Based Alginate Bio-nanocompositementioning

confidence: 99%

Heavy Metal Removal by Alginate Based Agriculture and Industrial Waste Nanocomposites

Omer¹

2022

Properties and Applications of Alginates

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The use of biopolymers and nonliving organisms as sorbents is one of the most promising techniques because they contain several functional groups which show different affinities towards various metal ions. Alginate is naturally occurring anionic biopolymer extracted from brown algae. It also contains numerous applications in biomedical science and engineering due to its favorable properties and ease of gelatin. This chapter represents a overview based on alginate based agriculture and industrial waste nanocomposites and found that limited studies are reported for combination of alginate with industrial/agriculture waste in nanoscalic material so far, but this review study enlightening the several studies based on nanocomposite combinations of alginates and biopolymers and these biopolymers can also be derived from various agro/industrial waste by simple chemical and mechanical methods. So, we should work on the formulation of alginates agro/industrial waste nanocomposites. Preparation of alginate nanomaterials with agriculture/industrial waste constituents confirms its effectiveness in water purification. In the environment, we can control its reutilization by desorption studies. Another advantage is that it can be transform from nanoparticles to nano polymeric films and support to batch adsorption process to fixed bed column in form of large-scale application.

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“…In general, rice husks generated from the milling process are considered as a waste and low-value agricultural byproduct [ 6 ]. They are mainly composed of materials such as cellulose, lignin, and silica.…”

Section: Introductionmentioning

confidence: 99%

Rice Husk-Derived Cellulose Nanofibers: A Potential Sensor for Water-Soluble Gases

Shahi

Lee

Min

et al. 2021

Sensors

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Cellulose and its derivatives have evoked much attention in sensor technology as host-matrices for conducting materials because of their versatility, renewability, and biocompatibility. However, only a few studies have dealt with the potential utilization of cellulose as a sensing material without a composite structure. In this study, cellulose nanofibers (CNF) and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNF) extracted from rice husks by using ultrasonic-assisted methods are introduced as a potential gas sensing material with highly sensitive performance. To fabricate nanocellulose-based films, CNF, TOCNF, and TOCNF with glycerol (TOCNF/G) were dispersed in water and applied on polyimide substrate with digital electrodes to form self-standing thin films by a drop-casting method. A transparent coating layer on the surface of the plate after drying is used for the detection of water-soluble gases such as acetone, ammonia, methane, and hydrogen sulfide gases at room temperature at 52% relative humidity. The sensor prototypes exhibited high sensitivity, and the detection limit was between 1 ppm and 5 ppm, with less than 10 min response and recovery time. The results indicate that both the CNF- and the TOCNF-coated sensors show good sensitivity toward ammonia and acetone, compared to other gases. A TOCNF/G-coated sensor exhibited minimum time in regard to response/recovery time, compared to a CNF-coated sensor. In this study, nanocellulose-based sensors were successfully fabricated using a low-cost process and a bio-based platform. They showed good sensitivity for the detection of various gases under ambient conditions. Therefore, our study results should further propel in-depth research regarding various applications of cellulose-based sensors in the future.

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Valorization of rice husk silica waste: Organo-amine functionalized castor oil templated mesoporous silicas for biofuels synthesis

Cited by 20 publications

References 51 publications

Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts

Biopolymers Fractionation and Synthesis of Nanocellulose/Silica Nanoparticles from Agricultural Byproducts

Heavy Metal Removal by Alginate Based Agriculture and Industrial Waste Nanocomposites

Rice Husk-Derived Cellulose Nanofibers: A Potential Sensor for Water-Soluble Gases

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