Hydroxypropyl methylcellulose based aerogels: Synthesis, characterization and application as adsorbents for wastewater pollutants

Martins, Bianca F.; Toledo, Paulo V. O.; Petri, Denise Freitas Siqueira

doi:10.1016/j.carbpol.2016.08.082

Cited by 68 publications

(18 citation statements)

References 35 publications

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“…Due to the uneven distribution of the substituent groups, the effect of different degrees of substitution of cellulose derivatives on the performance of cellulose aerogels remains unclear. With respect to published research results, the degree of substitution has shown no significant effect on the density or compressive modulus of cellulose aerogels [150,151], but a high degree of substitution can reduce the hygroscopicity [151].…”

Section: Preparation Of Cellulose Aerogelmentioning

confidence: 99%

“…The adsorption capacity of cellulose aerogels is one order of magnitude higher than that of natural adsorbents and several times that of commercial PP adsorbents. In addition, cellulose aerogels can adsorb dyes such as Congo red and methylene blue from water [151,153,164,181,182], and are biodegradable. Therefore, cellulose aerogels have received increasing attention in recent years.…”

Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

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Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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Due to its excellent performance, aerogel is considered to be an especially promising new material. Cellulose is a renewable and biodegradable natural polymer. Aerogel prepared using cellulose has the renewability, biocompatibility, and biodegradability of cellulose, while also having other advantages, such as low density, high porosity, and a large specific surface area. Thus, it can be applied for many purposes in the areas of adsorption and oil/water separation, thermal insulation, and biomedical applications, as well as many other fields. There are three types of cellulose aerogels: natural cellulose aerogels (nanocellulose aerogels and bacterial cellulose aerogels), regenerated cellulose aerogels, and aerogels made from cellulose derivatives. In this paper, more than 200 articles were reviewed to summarize the properties of these three types of cellulose aerogels, as well as the technologies used in their preparation, such as the sol-gel process and gel drying. In addition, the applications of different types of cellulose aerogels were also introduced.

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Section: Preparation Of Cellulose Aerogelmentioning

confidence: 99%

Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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“…The reduction of Cr(VI) to Cr(III) was monitored using as reference the absorbance of the initial 4 × 10 −4 mol L −1 K 2 Cr 2 O 7 solution, which was not irradiated and was kept in the absence of UV irradiation. Discs of cryogels (2 mm high, 35 mm diameter,~0.050 g) were inserted in Petri dishes (55 mm diameter) containing 5 mL of 5.0 mg L -1 (15.6 μmol L -1 ) MB solution prepared in 50 mM Tris-HCl, pH 7.0 [30]. At this, pH MB molecules are positively charged [31].…”

Section: Photoreduction Of Cr(vi) and Methylene Blue (Mb)mentioning

confidence: 99%

Recyclable Xanthan/TiO₂ Composite Cryogels towards the Photodegradation of Cr(VI) Ions and Methylene Blue Dye

Toledo

Marques

Petri

2019

International Journal of Polymer Science

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Composite cryogels were prepared from xanthan gum (XG) precursor gels at 20 g L-1 containing TiO2 load at 5, 10, and 20 wt% and citric acid, as crosslinker. The effect of the pH over precursor gel on the properties of the resulting cryogels was evaluated. The characterization of the XG/TiO2 cryogels comprised compression tests, swelling degree (SD) determination, Fourier transform infrared vibrational spectroscopy in the attenuated total reflectance mode (FTIR-ATR), scanning electron microscopy (SEM), and X-ray microtomography (CT) analyses. The largest compressive modulus (E) was observed for XG/TiO2 10% cryogels prepared at pH 4.0, which amounted to 100±7 kPa, whereas the E value determined for bare XG cryogels was 29±3 kPa. XG/TiO2 10% cryogels presented larger pores and thicker walls than bare XG cryogels, as evidenced by SEM and CT analyses. FTIR-ATR spectra evidenced the ester bonds stemming from the esterification among carboxylic acid groups and/or XG hydroxyl groups. XG/TiO2 10% cryogels presented SD of (61±2) gwater/gcryogel, long-term stability in water, and outstanding photocatalytic properties in the presence of Cr(VI) ions and methylene blue (MB). The photocatalytic processes for the reduction of Cr(VI) to Cr(III) and for the photobleaching of MB fitted the first-order kinetic model, yielding rate constants of 0.019 varying min-1 and 0.0096 min-1, respectively. For both processes, the XG/TiO2 10% cryogels could be recycled five times without losing shape or efficiency.

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“…These functionalization steps usually add to the complexity and cost of the final product. Martins et al 20 reported a maximal removal capacity of up to 86% for their hydroxypropyl methylcellulose (0.12 ± 0.001 g aerogel). Surface-functionalization of TEMPO aerogels achieved by coating with eumelanin thin films has resulted in a methylene blue adsorption of up to 50% (58 mg average and adsorbent in a 2 mg/L methylene blue) 21 .…”

Section: Introductionmentioning

confidence: 99%

Characterization and properties of hybrid foams from nanocellulose and kaolin-microfibrillated cellulose composite

González-Ugarte

Hafez

Tajvidi

2020

Sci Rep

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Hybrid nanocellulose-based foams are a desirable class of low-density and porous materials for their potential in many applications. This study aims at characterizing and understanding the structure-properties relationship of four foam formulations prepared from combinations of cellulose nanofibrils (CNF), cellulose nanocrystals (CNC), and kaolin-microfibrillated cellulose composite. All the foams were crosslinked with a polyamide-epichlorohydrin crosslinker (Polycup) to impart stability under wet conditions without additional functionalization. Foams containing 25 wt% kaolin exhibited excellent shape recovery promoted by a higher load of crosslinker (5 wt%), and superior compressive properties. The addition of CNC at 33.3 wt% and 50 wt% did not seem to enhance the properties of the foam and also reduced the specific surface area. A preliminary comparative study between the four tested formulations was conducted to assess the feasibility of the foam as an adsorbent of methylene blue dye.

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Hydroxypropyl methylcellulose based aerogels: Synthesis, characterization and application as adsorbents for wastewater pollutants

Cited by 68 publications

References 35 publications

Cellulose Aerogels: Synthesis, Applications, and Prospects

Cellulose Aerogels: Synthesis, Applications, and Prospects

Recyclable Xanthan/TiO₂ Composite Cryogels towards the Photodegradation of Cr(VI) Ions and Methylene Blue Dye

Characterization and properties of hybrid foams from nanocellulose and kaolin-microfibrillated cellulose composite

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Hydroxypropyl methylcellulose based aerogels: Synthesis, characterization and application as adsorbents for wastewater pollutants

Cited by 68 publications

References 35 publications

Cellulose Aerogels: Synthesis, Applications, and Prospects

Cellulose Aerogels: Synthesis, Applications, and Prospects

Recyclable Xanthan/TiO2 Composite Cryogels towards the Photodegradation of Cr(VI) Ions and Methylene Blue Dye

Characterization and properties of hybrid foams from nanocellulose and kaolin-microfibrillated cellulose composite

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Product

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Recyclable Xanthan/TiO₂ Composite Cryogels towards the Photodegradation of Cr(VI) Ions and Methylene Blue Dye