Sequential Oxidation on Wood and Its Application in Pb2+ Removal from Contaminated Water

Sharma, Priyanka R.; Sharma, Sunil K.; Nolan, Marc; Li, Wenqi; Kundal, Lakshta; Hsiao, Benjamin S.

doi:10.3390/polysaccharides2020017

Cited by 6 publications

(3 citation statements)

References 45 publications

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“…Morphology studies (performed by various methods: optical microscopy, SEM, TEM, AFM) have all confirmed the defibrillation of the substrate associated with the oxidation, and the subsequent improved dispersity of cellulose fibrils bearing single or multiple functionality (aldehyde and/or carboxylic groups) [ 137 , 146 , 163 , 164 , 165 ]. For example, TEMPO-oxidized cellulose exhibited a web-like structure made of well-separated and randomly entangled fibers, evidenced by TEM [ 166 , 167 ]. The higher was the content in carboxylic groups, the smaller were the fibrils dimensions (nanometric scale).…”

Section: Environmental Applications Of Materials Based On Selectively...mentioning

confidence: 99%

“…One particular experimental approach has been studied in order to be applied for Pb(II) removal. Sequential oxidation of raw wood cellulose by a complex three-stage procedure (TEMPO-periodate-chlorite) has yielded in a cellulose derivative bearing three carboxylate groups (TCC) [ 167 ]. The sorbent material was able to retain high amounts of Pb(II) onto its surface (1569 mg/g), second only to nitro-oxidized cellulose nanofibers (their adsorption capacity of lead was 2270 mg/g), which is much less common for lead than for other heavy metals.…”

Section: Environmental Applications Of Materials Based On Selectively...mentioning

confidence: 99%

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Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

Duceac¹,

Tanasă²,

Coseri³

2022

Materials

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Raw cellulose, or even agro-industrial waste, have been extensively used for environmental applications, namely industrial water decontamination, due to their effectiveness, availability, and low production cost. This was a response to the increasing societal demand for fresh water, which made the purification of wastewater one of the major research issue for both academic and industrial R&D communities. Cellulose has undergone various derivatization reactions in order to change the cellulose surface charge density, a prerequisite condition to delaminate fibers down to nanometric fibrils through a low-energy process, and to obtain products with various structures and properties able to undergo further processing. Selective oxidation of cellulose, one of the most important methods of chemical modification, turned out to be a multitask platform to obtain new high-performance, versatile, cellulose-based materials, with many other applications aside from the environmental ones: in biomedical engineering and healthcare, energy storage, barrier and sensing applications, food packaging, etc. Various methods of selective oxidation have been studied, but among these, (2,2,6,6-tetramethylpiperidin-1-yl)oxyl) (TEMPO)-mediated and periodate oxidation reactions have attracted more interest due to their enhanced regioselectivity, high yield and degree of substitution, mild conditions, and the possibility to further process the selectively oxidized cellulose into new materials with more complex formulations. This study systematically presents the main methods commonly used for the selective oxidation of cellulose and provides a survey of the most recent reports on the environmental applications of oxidized cellulose, such as the removal of heavy metals, dyes, and other organic pollutants from the wastewater.

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Section: Environmental Applications Of Materials Based On Selectively...mentioning

confidence: 99%

Section: Environmental Applications Of Materials Based On Selectively...mentioning

confidence: 99%

Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

Duceac¹,

Tanasă²,

Coseri³

2022

Materials

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“…Many novel alumina, rare earth elements, and silica-gel based adsorbents have been determined to have high adsorption capacities for fluoride, but most of these are too expensive to be widely used [3]. Nanocellulose prepared from cost-effective method such as the nitro-oxidation method, is also known as an excellent adsorbent for water purification [4][5][6][7][8][9][10][11][12][13][14][15][16]. The World Health Organization (WHO) also claims excess fluoride removal is expensive and that the best method is to just find safe water, but that is often not possible.…”

Section: Introductionmentioning

confidence: 99%

Study the Use of Activated Carbon and Bone Char on the Performance of Gravity Sand-Bag Water Filter

Fung

Johnson

et al. 2021

Membranes

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In this study, granulated activated charcoal (GAC) and bio charcoal (BC) is used as a filler in P3 biosand bag filter to study their filtration performance against a range of fluoride impurities from 1–1400 mg/L. A set of experiments are done to analyze the filtration efficiency of the sandbag filter against fluoride impurities after incorporating different amounts (e.g., 0.2, 2 kg) and a combination of GAC and BC. A combination of filler GAC and BC (1 kg each) have exhibited excellent results with 100% fluoride removal efficiency against 5 mg/L fluoride impurities for an entire experimental time of 165 min. It is because of the synergetic effect of adsorption caused by the high surface area (739 m2/g) of GAC and hydroxyapatite groups in BC. The data from remediation experiments using individual GAC and BC are fitted into the Langmuir and Freundlich Isotherm Models to check their adsorption mechanism and determine GAC and BC’s maximum adsorption capacity (Qm). The remediation data for both GAC and BC have shown the better fitting to the Langmuir Isotherm Model with a high R2 value of 0.994 and 0.970, respectively, showing the excellent conformity with monolayer adsorption. While the GAC and BC have presented negative Kf values of −1.08 and −0.72, respectively, for Freundlich Model, showing the non-conformity to multilayer adsorption. The Qm values obtained from Langmuir Model for GAC is 6.23 mg/g, and for BC, it is 9.13 mg/g. The pH study on adsorption efficiency of individual GAC and BC against 5 mg/L of fluoride impurities indicates the decrease in removal efficiency with an increase in pH from 3 to 9. For example, BC has shown removal efficiency of 99.8% at pH 3 and 99.5% at pH 9, while GAC has exhibited removal efficiency of 96.1% at pH 3 and 95.9% at pH 9. Importantly, this study presents the significance of the synergetic application of GAC and BC in the filters, where GAC and BC are different in their origin, functionalities, and surface characteristics.

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Strong nanostructured film and effective lead (II) removal by nitro-oxidized cellulose nanofibrils from banana rachis

Rwegasila,

Li,

Berglund

et al. 2024

Cellulose

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Banana rachis is an abundant and renewable source of cellulose from agricultural wastes. The main focus of the current work is the nanostructured aspects and the potential for removing heavy metals from wastewater using banana rachis cellulose. Highly individualized cellulose nano brils, CNF (length = 1231 nm, diameter = 5.26 nm) with negatively charged carboxylic groups at the C6 position of different degrees of oxidations (DO) were developed through nitro oxidation (NO) followed by simple mechanical treatment. The possibility of understanding the nanostructured aspects and tailoring high puri cation e ciency is discussed. A lm prepared through vacuum ltration of the hydrocolloid suspension was strong (tensile strength = 254 MPa, Young modulus = 10.7 GPa, tensile strain = 5.7%), with the highest strength reaching 334 MPa. The highest puri cation e ciency (compared to other adsorbents in the literature data) was reached at DO = 1.466 mmol/g using an initial Pb (II) concentration of 1000 ppm and followed pseudo-secondorder kinetics. A good relationship between an increased Pb (II) removal to the DO (0.455-1.466 mmol/g) and the NOCNF concentration was observed whereby chemisorption is the primary adsorption mechanism. The NOCNF shows a maximum adsorption capacity of 1667 mg/g at the DO = 0.455 mmol/g based on the Langmuir equilibrium adsorption isotherm. The lm formation property and high Pb (II) removal behavior were attributed to a wellindividualized NOCNF, good dispersion, and high nano bril interaction. The stiff cellulose crystal was successfully preserved even at a high DO with the crystallinity index = 72%.

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Sequential Oxidation on Wood and Its Application in Pb2+ Removal from Contaminated Water

Cited by 6 publications

References 45 publications

Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

Selective Oxidation of Cellulose—A Multitask Platform with Significant Environmental Impact

Study the Use of Activated Carbon and Bone Char on the Performance of Gravity Sand-Bag Water Filter

Strong nanostructured film and effective lead (II) removal by nitro-oxidized cellulose nanofibrils from banana rachis

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