Nanocellulose as a sustainable material for water purification

Ahankari, Sandeep S.; George, T.; Subhedar, Aditya; Kar, Kamal K.

doi:10.1002/pls2.10019

Cited by 42 publications

(28 citation statements)

References 154 publications

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“…In the later stage of cement hydration, the fiber moisture gradually loses, the fiber shrinks and collapses in the matrix interface, and some voids are left at the fiber and cement matrix interface, which affects the performance of the composite, as shown in Figure 4(b). In order to improve this situation, the acid hydrolysis method can be used to prepare micron-sized microcrystalline CFs and nanosized nanocrystalline CFs [105,106].…”

Section: Multitype Cfsmentioning

confidence: 99%

Research Progress on Durability of Cellulose Fiber-Reinforced Cement-Based Composites

Liu

2021

International Journal of Polymer Science

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The performance of cellulose fiber-reinforced cement-based composites (CFCCs) depends not only on the characteristics of the cement matrix and fibers but also on the bonding property of the matrix and fibers. The durability of cement-based composites including various properties such as impermeability, frost resistance, and carbonization resistance has an important impact on the long-term service life of the matrix structure. The presence of a large number of hydroxyl groups on the molecular chain of cellulose can promote the formation of intra- and intermolecular hydrogen bonds of cellulose. This special structure imparts the cellulose high hydrophilicity, which leads the cement hydration C-S-H gel to adhere to the surface of cellulosic fibers (CFs) and induce its growth. The cavity of CFs has good water absorption and can be used as an internal curing fiber for the continuous hydration of cement-based composites. But CFs in the Portland cement matrix tend to deteriorate under strong alkali conditions. This paper presents a review of the research on the durability of CFCCs. The methods and paths to improve the durability of CFCCs are summarized and analyzed from the perspectives of the internal curing of CFs, the deterioration of the performance of CFs in the matrix, and the use of many types of supplementary cementitious materials. Finally, the development and engineering application of CFCCs have been prospected.

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Section: Multitype Cfsmentioning

confidence: 99%

Research Progress on Durability of Cellulose Fiber-Reinforced Cement-Based Composites

Liu

2021

International Journal of Polymer Science

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“…However, the floccules formed in the coagulation of Cu were well distributed across the surface of the MCNC (insert Figure 3d). The patchy and poorly distributed flocs observed in the Fe coagulation suggests dual mechanisms in the process (insert Figure 3e) [27]. The elemental composition of the MCNC, Cu-flocs, Fe-flocs and Pb-flocs is summarized in Table 1.…”

Section: Scanning Electron Microscopy Analysismentioning

confidence: 97%

Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals

Oyewo

Ramaila

Mavuru

et al. 2021

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The presence of toxic metals in surface and natural waters, even at trace levels, poses a great danger to humans and the ecosystem. Although the combination of adsorption and coagulation techniques has the potential to eradicate this problem, the use of inappropriate media remains a major drawback. This study reports on the application of NaNO2/NaHCO3 modified sawdust-based cellulose nanocrystals (MCNC) as both coagulant and adsorbent for the removal of Cu, Fe and Pb from aqueous solution. The surface modified coagulants, prepared by electrostatic interactions, were characterized using Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS). The amount of coagulated/adsorbed trace metals was then analysed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). SEM analysis revealed the patchy and distributed floccules on Fe-flocs, which was an indication of multiple mechanisms responsible for Fe removal onto MCNC. A shift in the peak position attributed to C2H192N64O16 from 2θ = 30 to 24.5° occurred in the XRD pattern of both Pb- and Cu-flocs. Different process variables, including initial metal ions concentration (10–200 mg/L), solution pH (2–10), and temperature (25–45 °C) were studied in order to investigate how they affect the reaction process. Both Cu and Pb adsorption followed the Langmuir isotherm with a maximum adsorption capacity of 111.1 and 2.82 mg/g, respectively, whereas the adsorption of Fe was suggestive of a multilayer adsorption process; however, Fe Langmuir maximum adsorption capacity was found to be 81.96 mg/g. The sequence of trace metals removal followed the order: Cu > Fe > Pb. The utilization of this product in different water matrices is an effective way to establish their robustness.

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“…Amusa et al [ 27 ] also appraised the separation of CO 2 using polymeric mixed matric membranes (MMMs) containing pretreated lignocellulosic biomasses. However, only a few comprehensive reviews in the field of nanocellulose-based membrane technology for the treatment of water and wastewater are presented in the literature [ 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Lignocellulosic Biomass-Derived Nanocellulose Crystals as Fillers in Membranes for Water and Wastewater Treatment: A Review

et al. 2022

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The improvement of membrane applications for wastewater treatment has been a focal point of research in recent times, with a wide variety of efforts being made to enhance the performance, integrity and environmental friendliness of the existing membrane materials. Cellulose nanocrystals (CNCs) are sustainable nanomaterials derived from microorganisms and plants with promising potential in wastewater treatment. Cellulose nanomaterials offer a satisfactory alternative to other environmentally harmful nanomaterials. However, only a few review articles on this important field are available in the open literature, especially in membrane applications for wastewater treatment. This review briefly highlights the circular economy of waste lignocellulosic biomass and the isolation of CNCs from waste lignocellulosic biomass for membrane applications. The surface chemical functionalization technique for the preparation of CNC-based materials with the desired functional groups and properties is outlined. Recent uses of CNC-based materials in membrane applications for wastewater treatment are presented. In addition, the assessment of the environmental impacts of CNCs, cellulose extraction, the production techniques of cellulose products, cellulose product utilization, and their end-of-life disposal are briefly discussed. Furthermore, the challenges and prospects for the development of CNC from waste biomass for application in wastewater treatment are discussed extensively. Finally, this review unraveled some important perceptions on the prospects of CNC-based materials, especially in membrane applications for the treatment of wastewater.

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Nanocellulose as a sustainable material for water purification

Cited by 42 publications

References 154 publications

Research Progress on Durability of Cellulose Fiber-Reinforced Cement-Based Composites

Research Progress on Durability of Cellulose Fiber-Reinforced Cement-Based Composites

Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals

Lignocellulosic Biomass-Derived Nanocellulose Crystals as Fillers in Membranes for Water and Wastewater Treatment: A Review

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