Porous material from cellulose nanofibrils coated with aluminum hydroxyde as an effective adsorbent for fluoride

Mahfoudhi, Norhene; Boufi, Sami

doi:10.1016/j.jece.2020.103779

Cited by 26 publications

(7 citation statements)

References 31 publications

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“…The mixture was neutralized to pH 7 by the addition of a 10 M NaOH (Samchun, Korea) solution with stirring at 150 rpm. Under these conditions, the kenaf surface in the mixture is modified by a strong chelation reaction with Al, and the adsorbed Al 3+ is present mainly in the form of Al(OH) 3 at pH 7 (Mahfoudhi and Boufi 2020). The mixture was stirred for 4 h to prepare a homogeneous slurry.…”

Section: Production Of Al-impregnated Kenaf Biocharmentioning

confidence: 99%

Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Choi

Lee

Park

2022

Water Air Soil Pollut

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The fast-growing plant kenaf was pyrolyzed to biochar, and the biochar was impregnated with aluminum to improve its fluoride adsorption capacity. The Al-impregnated kenaf biochar (Al-KNF-BC) was pyrolyzed at different temperatures (300-700 °C). The specimen treated at 300 °C (Al-KNF-300) showed the highest fluoride adsorption capacity. The kinetics and equilibrium adsorption of fluoride by Al-KNF-300 followed the pseudo-second-order and Langmuir models, respectively. According to the Langmuir model, the maximum fluoride adsorption capacity of Al-KNF-300 is 13.93 mg/g. The enthalpy and entropy of fluoride adsorption by Al-KNF-300 were 37.80 kJ/mol and 124.1 J/mol‧K, respectively. Fluoride adsorption by Al-KNF-300 was favorable at pH values as low as pH 3, and the effect of anion competition followed the order HCO 3 − > SO 4 2− > NO 3 − > Cl − . In experiments with different adsorbent dose, the maximum adsorption efficiency of 99.

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Section: Production Of Al-impregnated Kenaf Biocharmentioning

confidence: 99%

Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Choi

Lee

Park

2022

Water Air Soil Pollut

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“…Higher adsorption rates of fluoride ion at the beginning of the experiment can be attributed due to the existence of a greater number of vacant active adsorption sites. As the contact time increased, most of the vacant sites in Zr(IV)-SBP were occupied by fluoride ion leads to a decrease in the fluoride adsorption rate (Mahfoudhi & Boufi, 2020). To identify the most reliable adsorption model and the adsorption mechanism, the experimental data were fitted to pseudo-first order and pseudo-second order kinetic models as given in equations ( 6) and ( 7), and the graphs are displayed in Figs.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Effectiveness of Zr(IV)-Loaded Banana Peels Biomass for the Uptake of Fluoride Anion from Water

Aryal

Poudel

Pokhrel

et al. 2021

J. Inst. Sci. Tech.

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The present study reports the fluoride uptake potential of Zr(IV)-loaded saponified banana peels (Zr(IV)-SBP) from water. Zr(IV)-SBP was synthesized by loading Zr(IV) onto banana peel biomass after saponification and sorbent characterization was performed by using different techniques including FE-SEM (Field Emission Scanning Electron Microscopy), FTIR (Fourier Transform Infra-Red) spectroscopy and zeta potential analysis. Batch experiments were carried out to examine the monitoring factors for the uptake of fluoride onto the investigated adsorbent. The optimal pH and contact time were found to be 2.94 and 300 minutes, respectively. The results from characterization techniques concurred that Zr(IV)-SBP have prominent adsorption sites favorable for the sorption of fluoride ions. The sorption behavior of fluoride onto Zr(IV)-SBP was best fitted with the Langmuir adsorption isotherm and pseudo-second-order kinetics model. The maximum adsorption capacity of Zr(IV)-SBP was 36.02 mg/g using the Langmuir isotherm model. The coexisting ions like chloride and nitrate caused very small interference, elevated concentration of sulphate notably lowers the fluoride adsorption percentage in the binary system, and the sorption using multiple systems was lowered significantly which is due to the synergistic effect of co-existing interfering ion. The adsorbed fluoride was completely desorbed using 2M NaOH solution. Fluoride sorption performance of Zr(IV)-SBP demonstrated that it can be a low cost, environmentally benign and one of the highly potent alternatives for the remediation of fluoride ions to avoid ablation on the water.

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“…The charge carried by CNFs enable them to be combined with better adsorption properties. Mahfoudhi et al [ 150 ] immersed CNFs aerosols in AlCl 3 and used NaOH to replace AlCl 3 with Al(OH) 3 to prepare a reusable, porous material for fluoride absorption. The report indicated that metal ions were adsorbed on the surface of CNFs, significantly improving the adsorption capacity of fluoride.…”

Section: Surface Modification Of Nanofibrilsmentioning

confidence: 99%

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

Zhao

et al. 2020

Materials

146

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This review summarizes the preparation methods of cellulose nanofibrils (CNFs) and the progress in the research pertaining to their surface modification. Moreover, the preparation and surface modification of nanocellulose were comprehensively introduced based on the existing literature. The review focuses on the mechanical treatment of cellulose, the surface modification of fibrillated fibers during pretreatment, the surface modification of nanocellulose and the modification of CNFs and their functional application. In the past five years, research on cellulose nanofibrils has progressed with developments in nanomaterials research technology. The number of papers on nanocellulose alone has increased by six times. However, owing to its high energy consumption, high cost and challenging industrial production, the applications of nanocellulose remain limited. In addition, although nanofibrils exhibit strong biocompatibility and barrier and mechanical properties, their high hydrophilicity limits their practical application. Current research on cellulose nanofibrils has mainly focused on the industrial production of CNFs, their pretreatment and functional modification and their compatibility with other biomass materials. In the future, with the rapid development of modern science and technology, the demand for biodegradable biomass materials will continue to increase. Furthermore, research on bio-based nanomaterials is expected to advance in the direction of functionalization and popularization.

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Porous material from cellulose nanofibrils coated with aluminum hydroxyde as an effective adsorbent for fluoride

Cited by 26 publications

References 31 publications

Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Effectiveness of Zr(IV)-Loaded Banana Peels Biomass for the Uptake of Fluoride Anion from Water

From Cellulose to Cellulose Nanofibrils—A Comprehensive Review of the Preparation and Modification of Cellulose Nanofibrils

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