Cellulose-based special wetting materials for oil/water separation: A review

Zhao, Xueqing; Wahid, Fazli; Cui, Ji-Xiao; Wang, Yun-Ya; Zhong, Cheng

doi:10.1016/j.ijbiomac.2021.06.167

Cited by 69 publications

(17 citation statements)

References 224 publications

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“…In this case, the agglomeration could be related to the solvent promoting the adhesion of wax particles that are subsequently drawn to large agglomerates and removed from some sections of fibers. In addition, it is known that surface roughness can significantly impact wettability [ 33 , 34 ]. Thus, initial layers promote a smooth coating of surface fibers, and a higher number of layers, i.e., above three for the spray method and above five for the dip method, results in much larger wax agglomerates on the surface of NP.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Wax Coatings Made from Pine Needle Extraction Waste for Nanopaper Hydrophobization

et al. 2022

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We combine renewable and waste materials to produce hydrophobic membranes in the present work. Cellulose nanopaper prepared from paper waste was used as a structural component for the membrane. The pine wax was reclaimed from pine needle extraction waste and can be regarded as a byproduct. The dip-coating and spray-coating methods were comprehensively compared. In addition, the solubility of wax in different solvents is reported, and the concentration impact on coating quality is presented as the change in the contact angle value. The sensile drop method was used for wetting measurements. Spray-coating yielded the highest contact angle with an average of 114°, while dip-coating reached an average value of 107°. Scanning electron microscopy (SEM) was used for an in-depth comparison of surface morphology. It was observed that coating methods yield significantly different microstructures on the surface of cellulose fibers. The wax is characterized by nuclear magnetic resonance (NMR) spectroscopy and differential scanning calorimetry (DSC). Pine wax has a melting temperature of around 80 °C and excellent thermal stability in oxygen, with a degradation peak above 290 °C. Fourier transform infrared spectroscopy (FTIR) was used to identify characteristic groups of components and show the changes on coated nanopaper. Overall, the results of this work yield important insight into wax-coated cellulose nanopapers and a comparison of spray- and dip-coating methods. The prepared materials have a potential application as membranes and packaging materials.

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Section: Resultsmentioning

confidence: 99%

Sustainable Wax Coatings Made from Pine Needle Extraction Waste for Nanopaper Hydrophobization

et al. 2022

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“…The wastewater might be hypersaline and also include metals, organic wastes, emulsions, organic and inorganic dyes, and even harmful microorganisms. In recent years, nanotechnology has introduced a number of innovative nanocellulose-based materials that have potential to resonate with the findings in the field of waste water treatment [ 54 , 55 , 56 ]. The increase in the research interest for nanocellulose can be seen in the number of associated studies, as shown in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

2022

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Membrane-based desalination has proved to be the best solution for solving the water shortage issues globally. Membranes are extremely beneficial in the effective recovery of clean water from contaminated water sources, however, the durability as well as the separation efficiency of the membranes are restricted by the type of membrane materials/additives used in the preparation processes. Nanocellulose is one of the most promising green materials for nanocomposite preparation due to its biodegradability, renewability, abundance, easy modification, and exceptional mechanical properties. This nanocellulose has been used in membrane development for desalination application in the recent past. The study discusses the application of membranes based on different nanocellulose forms such as cellulose nanocrystals, cellulose nanofibrils, and bacterial nanocellulose for water desalination applications such as nanofiltration, reverse osmosis, pervaporation, forward osmosis, and membrane distillation. From the analysis of studies, it was confirmed that the nanocellulose-based membranes are effective in the desalination application. The chemical modification of nanocellulose can definitely improve the surface affinity as well as the reactivity of membranes for the efficient separation of specific contaminants/ions.

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“…Aerogels are highly porous functional materials that have been prepared from organic and inorganic materials and applied for numerous applications, including water treatment. Nanocellulose-based aerogel is known for its high porosity, ultralow density and excellent absorption capacity [ 11 ]. As a biopolymer, cellulose is a biodegradable, cost-effective and ecofriendly substance, and developing nanocellulose aerogel only consumes a tiny amount of cellulose due to the high porosity of aerogels [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

et al. 2022

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Oil spills and oily wastewater have become a major environmental problem in recent years, directly impacting the environment and biodiversity. Several techniques have been developed to solve this problem, including biological degradation, chemicals, controlled burning, physical absorption and membrane separation. Recently, biopolymeric aerogels have been proposed as a green solution for this problem, and they possess superior selective oil absorption capacity compared with other approaches. Several modification strategies have been applied to nanocellulose-based aerogel to enhance its poor hydrophobicity, increase its oil absorption capacity, improve its selectivity of oils and make it a compressible and elastic magnetically responsive aerogel, which will ease its recovery after use. This review presents an introduction to nanocellulose-based aerogel and its fabrication approaches. Different applications of nanocellulose aerogel in environmental, medical and industrial fields are presented. Different strategies for the modification of nanocellulose-based aerogel are critically discussed in this review, presenting the most recent works in terms of enhancing the aerogel performance in oil absorption in addition to the potential of these materials in near future.

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Cellulose-based special wetting materials for oil/water separation: A review

Cited by 69 publications

References 224 publications

Sustainable Wax Coatings Made from Pine Needle Extraction Waste for Nanopaper Hydrophobization

Sustainable Wax Coatings Made from Pine Needle Extraction Waste for Nanopaper Hydrophobization

Progress and Prospects of Nanocellulose-Based Membranes for Desalination and Water Treatment

Recent Progress in Modification Strategies of Nanocellulose-Based Aerogels for Oil Absorption Application

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