TEMPO-oxidized pulp as an efficient and recyclable sorbent to remove paraquat from water

Lin, Kun‐Yi Andrew; Heish, Yu-Tsung; Tsai, Tzung-Yung; Huang, Chih‐Feng

doi:10.1007/s10570-015-0703-2

Cited by 12 publications

(5 citation statements)

References 41 publications

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“…Several techniques have been employed for the extraction of CNFs from the biomass including high-pressure homogenization [7], grinding [8], cryocrushing [9], high-intensity ultrasonication [10], steam explosion process [11], electrospinning [10], high speed blending [12], 2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidation [13,14,15], and extrusion process [16]. Recently the steam explosion technique has proved as an efficient technique to extract CNFs from the biomasses.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

et al. 2019

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The conventional isolation of cellulose nanofibers (CNFs) process involves high energy input which leads to compromising the pulp fiber’s physical and chemical properties, in addition to the issue of elemental chlorine-based bleaching, which is associated with serious environmental issues. This study investigates the characteristic functional properties of CNFs extracted via total chlorine-free (TCF) bleached kenaf fiber followed by an eco-friendly supercritical carbon dioxide (SC-CO2) treatment process. The Fourier transmission infra-red FTIR spectra result gave remarkable effective delignification of the kenaf fiber as the treatment progressed. TEM images showed that the extracted CNFs have a diameter in the range of 10–15 nm and length of up to several micrometers, and thereby proved that the supercritical carbon dioxide pretreatment followed by mild acid hydrolysis is an efficient technique to extract CNFs from the plant biomass. XRD analysis revealed that crystallinity of the fiber was enhanced after each treatment and the obtained crystallinity index of the raw fiber, alkali treated fiber, bleached fiber, and cellulose nanofiber were 33.2%, 54.6%, 88.4%, and 92.8% respectively. SEM images showed that amorphous portions like hemicellulose and lignin were removed completely after the alkali and bleaching treatment, respectively. Moreover, we fabricated a series of cellulose nanopapers using the extracted CNFs suspension via a simple vacuum filtration technique. The fabricated cellulose nanopaper exhibited a good tensile strength of 75.7 MPa at 2.45% strain.

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Section: Introductionmentioning

confidence: 99%

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

et al. 2019

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“…The polysaccharide chains aggregate in the presence of strong intermolecular hydrogen bonding to form large bundles with tens of micrometers in width. The fibril bundles concurrently form well-packing chains and hierarchical structures, resulting in high crystallinity [4,5,6]. Thus, great attention has been paid to cellulose as an excellent candidate for making an alternative type of sustainable, renewable, and biodegradable filler within polymeric composites.…”

Section: Introductionmentioning

confidence: 99%

“…The modified products (TOCN–Br) were subsequently grafted with polystyrene (PSt) by the surface-initiated (SI) normal ATRP method. We not only controlled PSt chains length grafted from TOCN surface with low PDI, but also demonstrated the resulting TOCN– g –PSt nanomaterials as an efficient adsorbent for the persistent organic pollutant (i.e., 1,2,4–trichlorobenzene), heavy metal ions (i.e., Cu 2+ and Cr 3+ ), and paraquat [4,5] in aqueous solution. However, a relatively high amount of copper catalyst was typically used to conduct normal ATRP (>2000 ppm), requiring repeated purification steps of dispersion-and-precipitation to remove the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Tsai

Chang

et al. 2019

Polymers

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An effective method of oxidation from paper pulps via 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) compound to obtain TEMPO-oxidized cellulose nanofibers (TOCNs) was demonstrated. Following by acylation, TOCN having an atom transfer radical polymerization (ATRP) initiating site of bromoisobutyryl moiety (i.e., TOCN–Br) was successfully obtained. Through a facile and practical technique of surface-initiated initiators for continuous activator regeneration atom transfer radical polymerization (SI ICAR ATRP) of methyl methacrylate (MMA) from TOCN–Br, controllable grafting polymer chain lengths (Mn = ca. 10k–30k g/mol) with low polydispersity (PDI < 1.2) can be achieved to afford TOCN–g–Poly(methyl methacrylate) (PMMA) nanomaterials. These modifications were monitored by Fourier-transform infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), electron spectroscopy for chemical analysis (ESCA), and water contact angle analysis. Eventually, TOCN–g–PMMA/PMMA composites were prepared using the solvent blending method. Compared to the pristine PMMA (Tg = 100 °C; tensile strength (σT) = 17.1 MPa), the composites possessed high transparency with enhanced thermal properties and high tensile strength (Tg = 110 °C and σT = 37.2 MPa in 1 wt% TOCN containing case) that were investigated by ultraviolet-visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and tensile tests. We demonstrated that minor amounts of TOCN–g–PMMA nanofillers can provide high efficacy in improving the mechanical and thermal properties of PMMA matrix.

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“…Therefore, it is necessary to design feasible processes to minimize the pollution caused by paraquat discharges and to reduce the risks associated with its presence in the environment. Several methods used for the treatment of polluted water in various organic compounds such as photocatalysis using compounds sensitive to UV radiation, the Fenton process which is part of advanced oxidation processes, phytoremediation, reverse osmosis and adsorption which uses various porous matrices to fix and concentrate within them the polluting molecules in solution have been used to decontaminate the water resources of the various pesticides (Lin et al 2015). Of all these methods, adsorption probably presents the best compromise in terms of processing performance and simple implementation.…”

Section: Introductionmentioning

confidence: 99%

Modeling adsorption mechanism of paraquat onto Ayous (Triplochiton scleroxylon) wood sawdust

Kamga

2018

Appl Water Sci

179

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The equilibrium sorption of a local Ayous (Triplochiton scleroxylon) wood sawdust was examined as substitute adsorbent for removal of paraquat from water. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (DRK) isotherms were used to compare the equilibrium sorption data obtained. The separation factor revealed a constructive sorption experiment since the maximum monolayer coverage (Q 0 ) from Langmuir isotherm model was found out to be 41.66 µmol/g. In addition, the correlation value of Langmuir isotherm model was the maximum among the four adsorption isotherms. From Freundlich isotherm model, the sorption intensity (n) that denotes favorable sorption and the correlation value are 2.402 and 0.929, respectively. Temkin isotherm model was used to calculate the heat of sorption process which corresponds to 18.39 J/mol, and the mean free energy was estimated from DRK isotherm model to be 0.091 kJ/mol which vividly proved that the adsorption experiment was obeyed to a physical process. The results indicate that this local wood sawdust could be employed as an economical material for reducing paraquat from industrial wastewater.

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TEMPO-oxidized pulp as an efficient and recyclable sorbent to remove paraquat from water

Cited by 12 publications

References 41 publications

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

Extraction of Cellulose Nanofibers via Eco-friendly Supercritical Carbon Dioxide Treatment Followed by Mild Acid Hydrolysis and the Fabrication of Cellulose Nanopapers

Surface-Initiated Initiators for Continuous Activator Regeneration (SI ICAR) ATRP of MMA from 2,2,6,6–tetramethylpiperidine–1–oxy (TEMPO) Oxidized Cellulose Nanofibers for the Preparations of PMMA Nanocomposites

Modeling adsorption mechanism of paraquat onto Ayous (Triplochiton scleroxylon) wood sawdust

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