Circular economy approach for rice husk modification: equilibrium, kinetic, thermodynamic aspects and mechanism of Congo red adsorption

Mladenovic, Nina; Petkovska, Jovana; Dimova, Vesna; Dimitrovski, Dejan; Jordanov, Igor

doi:10.1007/s10570-021-04312-9

Cited by 14 publications

(12 citation statements)

References 73 publications

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“…From the Dubinin–Radushkevich model, the magnitude of E is used for evaluating the type of adsorption mechanism. If the value of E is between 8 and 16 kJ/mol, it indicates chemisorption, while for values of E < 8 kJ/mol, the sorption process is of a physical nature [ 62 , 63 ]. Our results showed that the adsorption of CR on heterostructure adsorbent is physical adsorption, owing to the values of E being between 0.2672 and 1.118 kJ/mol (25 °C < T < 45 °C).…”

Section: Resultsmentioning

confidence: 99%

Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent

et al. 2022

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The current research intended to employ a facile and economical process, which is also ecofriendly to transform camel waste bones into novel heterostructure for cleansing of diverse waste waters. The bones of camel were utilized for preparation of hydroxyapatite by hydrothermal method. The prepared hydroxyapatite was applied to the synthesis of cerium oxide-hydroxyapatite coated with natural polymer chitosan (CS-HAP-CeO2) heterostructure. Being abundant natural polymer polysaccharide, chitosan possesses exceptional assets such as accessibility, economic price, hydrophilicity, biocompatibility as well as biodegradability, therefore style it as an outstanding adsorbent for removing colorant and other waste molecules form water. This heterostructure was characterized by various physicochemical processes such as XRD, SEM-EDX, TEM, and FT-IR. The CS-HAP-CeO2 was screened for adsorption of various industrially important dyes, viz., Brilliant blue (BB), Congo red (CR), Crystal violet (CV), Methylene blue (MB), Methyl orange (MO), and Rhodamine B (RB) which are collective pollutants of industrial waste waters. The CS-HAP-CeO2 demonstrated exceptional adsorption against CR dye. The adsorption/or removal efficiency ranges are BB (11.22%), CR (96%), CV (28.22%), MB (47.74%), MO (2.43%), and RB (58.89%) dyes. Moreover, this heterostructure showed excellent bacteriostatic potential for E. coli, that is liable for serious waterborne diseases. Interestingly, this work revealed that the incorporation of cerium oxide and chitosan into hydroxyapatite substantially strengthened antimicrobial and adsorption capabilities than those observed in virgin hydroxyapatite. Herein, we recycled the unwanted camel bones into a novel heterostructure, which assists to reduce water pollution, mainly caused by the dye industries.

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Section: Resultsmentioning

confidence: 99%

Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent

et al. 2022

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“…Its chemical composition contains around 32% cellulose, 21% hemicellulose, 21% lignin, 20% SiO2, and 3% crude proteins (Mladenovic et al 2022). The high amount of cellulose in the husk enables the usage of this biomass as an adsorbent for purifying effluents from dyeing cellulosic fibers, with the removal of the lignin as the only prerequisite.…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned before, the low cost of the adsorption and modification process is detrimental. In a previous study, rice husk was modified with effluent from the alkaline scouring of cotton fabric in an inexpensive closed-loop process using the circular economy approach (Mladenovic et al 2022). In that study, rice husk modified without additional energy and chemicals used showed an excellent ability to remove Congo red from the colored effluent (Mladenovic et al 2020;Mladenovic et al 2022).…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study, rice husk was modified with effluent from the alkaline scouring of cotton fabric in an inexpensive closed-loop process using the circular economy approach (Mladenovic et al 2022). In that study, rice husk modified without additional energy and chemicals used showed an excellent ability to remove Congo red from the colored effluent (Mladenovic et al 2020;Mladenovic et al 2022). In this study, the equilibrium and kinetics of two reactive dyes, cold brand BEZAKTIV BLAU V3-R (BBV3-R) and medium brand BEZAKTIV BLAU S-2R (BBS2-R), onto rice husk modified with cotton scouring effluent (ERH), by the concept of the circular economy, is explored.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of BEZAKTIV BLAU V3-R and BEZAKTIV BLAU S-2R reactive dyes onto rice husk modified by the circular economy concept

Mladenovic

Petkovska

Dimova

et al. 2022

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Rice husk, modified with effluent from the alkaline scouring of cotton, employing an inexpensive treatment based on the circular economy concept, is used as a bio-sorbent to study the equilibrium and kinetic on cold brand BEZAKTIV BLAU V3-R (BBV3-R) and medium brand BEZAKTIV BLAU S-2R (BBS2-R) reactive dyes. 10, 20, and 40 g L-1 rice husk is used to follow adsorption of 0.1, 0.2, 0.3, 0.4, and 0.5 g L-1 BBV3-R and BBS2-R in a presence of 60 g L-1 NaCl at pH 10, at the temperature of 25oC and 40oC, respectively. Langmuir, Freundlich, and Dubinin-Radushkevic's adsorption models were employed, with the Freundlich model proving the best fit for our data. Activation energy calculated with the Dubinin-Radushkevic model (lower than 8 KJ mol-1) confirms the physical sorption of these reactive dyes onto the husk. The obtained maximum experimental absorption capacities of 122.2 mg g-1 for BBV3-R and 171.7 mg g-1 for BBS2-R using 10 g L-1 ERH are the best found in the literature. Pseudo-second-order model determines the adsorption kinetics, while the liquid film diffusion model is rate-determining. This paper demonstrates the applicability of the circular economy concept to obtain an efficient adsorbent for purifying colored effluent enriched with reactive dyes, which are one of the most challenging dyes in the textile industry from the aspect of their effluent purifying.

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“…The biochar derived from the lime fiber waste was employed for the adsorption of a mixture with sulfamethoxazole (SMX) and methyl paraben (MP). Mladenovic and co-workers studied a CE approach for rice husk modification, with accent on equilibrium, kinetic, thermodynamic studies, and mechanism of Congo red dye removal [ 37 ]. Their findings demonstrated the CE concept’s applicability in the development of an effective adsorbent without wasting more chemicals or energy.…”

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confidence: 99%

Special Issue “Advanced Materials for Water Remediation”

et al. 2022

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Circular economy approach for rice husk modification: equilibrium, kinetic, thermodynamic aspects and mechanism of Congo red adsorption

Cited by 14 publications

References 73 publications

Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent

Chitosan-Functionalized Hydroxyapatite-Cerium Oxide Heterostructure: An Efficient Adsorbent for Dyes Removal and Antimicrobial Agent

Adsorption of BEZAKTIV BLAU V3-R and BEZAKTIV BLAU S-2R reactive dyes onto rice husk modified by the circular economy concept

Special Issue “Advanced Materials for Water Remediation”

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