Development of novel alginate–silica hybrid membranes for pervaporation dehydration of isopropanol

Choudhari, Santosh K.; Premakshi, H. G.

doi:10.1007/s00289-015-1515-0

Cited by 20 publications

(4 citation statements)

References 54 publications

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“…Combining alginate with inorganic silica matrices offers several advantages in terms of chemical and mechanical stability (Pannier et al, 2014 ). Indeed, in recent literature (Choudhari et al, 2016 ), alginate–silica composites were proposed as a new class of materials with promising applications in several fields, such as biomedicine, biocatalysis, bioseparation, and biosensing.…”

Section: Introductionmentioning

confidence: 99%

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

et al. 2018

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In this work a new mesoporous adsorbent material obtained from a natural, high abundant raw material and a high volume industrial by-product is presented. The material is consolidated by the gelling properties of alginate and by decomposition of sodium-bicarbonate controlled porosity at low temperatures (70–80°C) at different scale lengths. The structural, thermal, and morphological characterization shows that the material is a mesoporous organic-inorganic hybrid. The material is tested as adsorbent, showing high performances. Methylene blue, used as model pollutant, can be adsorbed and removed from aqueous solutions even at a high concentration with efficiency up to 94%. By coating the material with a 100 nm thin film of titania, good photodegradation performance (more than 20%) can be imparted. Based on embodied energy and carbon footprint of its primary production, the sustainability of the new obtained material is evaluated and quantified in respect to activated carbon as well. It is shown that the new proposed material has an embodied energy lower than one order of magnitude in respect to the one of activated carbon, which represents the gold standards. The versatility of the new material is also demonstrated in terms of its design and manufacturing possibilities In addition, this material can be printed in 3D. Finally, preliminary results about its ability to capture diesel exhaust particulate matter are reported. The sample exposed to diesel contains a large amount of carbon in its surface. At the best of our knowledge, this is the first time that hybrid porous materials are proposed as a new class of sustainable materials, produced to reduce pollutants in the wastewaters and in the atmosphere.

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Section: Introductionmentioning

confidence: 99%

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

et al. 2018

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“…Secondly, an increase of thermal energy intensifies the motion of polymer chain segments, possibly creating a higher level of free-volume in the polymer matrix. However, in the present study, the latter reason is ruled out since the experiments were performed well below the glass transition temperature of the crosslinked sodium alginate [51]. Therefore, the viscosity of permeating molecules played a major role in allowing the associated molecules along with the selective permeants.…”

Section: Effect Of Temperature On the Pervaporation Performancementioning

confidence: 81%

Crosslinked Nanocomposite Sodium Alginate-Based Membranes with Titanium Dioxide for the Dehydration of Isopropanol by Pervaporation

Mitchell

2020

Molecules

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Sodium alginate (NaAlg) based membranes were prepared using a solution technique, crosslinked with poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-MA). Subsequently, the membranes were modified by the incorporation of 0, 10, 20, 30 and 40% w/w of titanium dioxide with respect to sodium alginate. The membranes thus obtained were designated as M, M-1, M-2, M-3 and M-4, respectively. An equilibrium swelling experiment was performed using different compositions of the water and isopropanol mixtures. Subsequently, we used a pervaporation cell fitted with each membrane in order to evaluate the extent of the pervaporation dehydration of isopropanol. Among the membranes studied, the membranes containing 40 mass% of titanium dioxide exhibited the highest separation factor(α) of 24,092, with a flux(J) of 18.61 × 10 −2 kg/m 2 ·h at 30 • C for 10 mass% w/w of water in the feed. The total flux and the flux of water were found to overlap with each other, indicating that these membranes can be effectively used to break the azeotropic point of water-isopropanol mixtures. The results clearly indicate that these nanocomposite membranes exhibit an excellent performance in the dehydration of isopropanol. The activation energy values obtained for the water permeation were significantly lower than those of the isopropanol permeation, underlining that these membranes have a high separation ability for the water-isopropanol system. The estimated activation energies for total permeation (E P ) and total diffusion (E D ) values ranged between 10.60 kJ·mol −1 and 3.96 kJ·mol −1 , and 10.76 kJ·mol −1 and 4.29 kJ·mol −1 , respectively. The negative change in the enthalpy values for all the membranes indicates that sorption was mainly dominated by Langmuir's mode of sorption.These are high when there are strong interactions between the feed mixture and the polymer matrix, since the transport of the permeant is not only dependent on its own driving force but also on the friction of this permeant with other components in the feed and polymer matrix [7].The separation of mixtures of alcohols has received much attention due to the potential applications in industry. Generally, low-molecular-weight alcohols are miscible with water and form azeotropic mixtures, which cannot be separated easily by traditional distillation [8]. Amongst the numerous alcohols, isopropanol is an industrially important liquid, and forms an azeotrope with water at a composition of isopropanol 87.7 wt% [9]. The pervaporation process can effectively separate azeotropic mixtures while reducing the cost and energy consumption. The technical feasibility of this process largely depends on the membrane and its properties. Most of the studies reported in the scientific literature on pervaporation separation are focused on the use of hydrophilic materials which preferentially absorb the water molecules, leading to high selectivity and permeation flux [10][11][12][13][14][15]. Sodium alginate as a hydrophilic polymer is widely explored in pervaporation as a membrane material fo...

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“…When the concentration of the feed mixture decreases, the membranes absorb water molecules resulting in higher swelling. This causes membranes to become more flexible [22][23] but mechanically stable. Hence, the energy required for diffusive transport through the membranes decreases and thereby more amount of permeate is being absorbed.…”

Section: Effect Of Feed Composition and Nano Zno Loading On Membrane mentioning

confidence: 99%

Polymeric Nanocomposites for Dehydration of Isopropyl Alcohol–Water Mixtures by Pervaporation

Kittur¹,

Madhu²,

Rashmi³

et al. 2018

ChChT

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Development of novel alginate–silica hybrid membranes for pervaporation dehydration of isopropanol

Cited by 20 publications

References 54 publications

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

A New Porous Hybrid Material Derived From Silica Fume and Alginate for Sustainable Pollutants Reduction

Crosslinked Nanocomposite Sodium Alginate-Based Membranes with Titanium Dioxide for the Dehydration of Isopropanol by Pervaporation

Polymeric Nanocomposites for Dehydration of Isopropyl Alcohol–Water Mixtures by Pervaporation

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