Polyelectrolyte complex membranes made of chitosan—PSSAMA for pervaporation separation of industrially important azeotropic mixtures

Achari, Divya D.; Rachipudi, P.S.; Naik, Satishkumar R.; Karuppannan, Ramesh

doi:10.1016/j.jiec.2019.05.031

Cited by 37 publications

(18 citation statements)

References 52 publications

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“…Achari et al and Chen et al reported that the PECs that are closer to the stoichiometric ratio have a higher T g due to a lower degree of water plasticization. 26,31 The increasing number of ionic cross-links makes the PE chains less mobile and the PEC less permeable (i.e. denser).…”

Section: Resultsmentioning

confidence: 99%

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

et al. 2021

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“…In Figure 1b, according to the peaks of the DTG curve, it could be seen that PS-MA undergoes thermal decomposition in three stages. The first stage occurred at a temperature below 173 C with a weight decline of 1.86%, which was intently related to the dehydration of the adsorbed water molecules, 23 indicating that the hydrophilicity of PS-MA has improved relative to WPS. The intensive destruction of PS-MA macromolecules takes place in the second stage in the temperature range of 173-652 C, the heat loss of this process was 50.32%, and the maximum value of DTG appeared at 427 C. And the last stage that occurred above 652 C corresponded to the formation of the carbon residue.…”

Section: Ftir and Tg Analysesmentioning

confidence: 99%

Converting waste polystyrene foam into new value‐added materials: A large‐capacity scavenger to remove cationic dyes and heavy metals

Hao

Xie

et al. 2021

J of Applied Polymer Sci

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Waste white foam, toxic dyes, and metal ions are difficult to degrade in the ecological environment, posing a serious threat to human health and natural beauty, it is of great significance to design a functional material to jointly solve these problems. This study provided a facile approach to convert waste polystyrene foam into a new acid anhydride modified polystyrene adsorbent (PS-MA) for the dyes and heavy metals removal from aqueous solution. The as-obtained absorbent was characterized by Fourier transform infrared spectroscopy, thermogravimetry, scanning electron microscopy, energy dispersive spectroscopy, Brunauer Emmett Teller method, and X-ray photoelectron spectroscopy. Influencing factors are including, pH, dye concentration, contact time and temperature on the adsorption of methylene blue (MB), safranine T (ST), and Cu(II) were systematically studied. Boehm titration showed that the content of surface carboxyl groups reached 4.53 mmol/g. The maximum adsorption capacity had reached 1405.37 mg/g for MB, 2269.33 mg/g for ST, 65.03 mg/g for Cu(II). Moreover, the kinetic data were in good agreement with the pseudo-second-order model and closed to adsorption equilibrium at 20 min. After five times of recycling experiments and the application of mixed dye wastewater with salinity, PS-MA showed excellent stability and removal ability. Abundant efforts revealed a broad application prospect of PS-MA materials in water remediation.

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“…The PV performance of the resulting membranes was investigated using an indigenously designed laboratoryscale pervaporation setup, as shown in our previous papers. [26,32] Briefly, the effective membrane surface area in contact with the feed mixture was 34.23 cm 2 , and the capacity of feed compartment was about 250 cm 3 . The two-stage vacuum pump (Toshniwal, Chennai, India) was used to keep the vacuum [1.333224 × 10 3 Pa (10 Torr)] on the downstream side of the apparatus.…”

Section: Pervaporation Experimentsmentioning

confidence: 99%

“…The first reason for this is the azeotropic mixture of water/isopropanol mixture (12.2 wt % of water and 87.8 wt% of IPA) has more prominent hydrocarbon content and favors hydrogen bonding between the alcohol and the water molecules. [32] Thus, the water molecules could be easily separated from water/isopropanol mixtures through the membrane when vacuum pressure is applied at the downstream side of the membrane. Second, 1,4-dioxane is a cyclic ether and non-polar in nature, because of the low reactivity of the functional group and the chemical behavior of ethers, both aliphatic and aromatic nature increases the hydrophobicity of the mixture causing decrease in permeation flux.…”

Section: Swelling Studymentioning

confidence: 99%

Modification of highly brittle polystyrene sulfonic acid‐co‐maleic acid crosslinked sodium alginate membrane into flexible membranes by the incorporation of dibutyl phthalate as a plasticizer for pervaporation separation

Achari

Heggannavar

2020

J of Applied Polymer Sci

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To convert highly brittle into flexible membrane, the polystyrene sulfonic acid‐co‐maleic acid crosslinked sodium alginate (PSSAMA/NaAlg) membrane was modified by incorporating the different weight% of dibutyl phthalate (DBP) as a plasticizer. The effect of DBP content on the physico‐chemical properties of the membranes was thoroughly examined. The membranes exhibited lower glass transition temperatures with increasing the plasticizer content in the matrix of PSSAMA/NaAlg. The separation performance of the membranes for water/isopropanol and water/1,4‐dioxane was studied at different temperatures. Among the modified membranes, the membrane containing 6 wt% of DBP exhibited the highest separation factors of 24,129 with a flux of 13.57 × 10−2 kg/m2 hr and 23,353 with a flux of 12.99 × 10−2 kg/m2 hr for water/isopropanol and water/1,4‐dioxane at 30°C, respectively. From the temperature‐dependent diffusion and permeation values, the Arrhenius activation parameters were estimated. The estimated activation energy values for permeation of water (Epw) and isopropanol (EpIPA) were, respectively, ranged between 12.09 and 8.79, and 42.52 and 32.79 kJ/mol. A negative heat of sorption (ΔHs) values was obtained for all the membranes, suggesting that Langmuir's mode of sorption was predominant. Based on the results, it is concluded that the modified membranes demonstrated excellent pervaporation performance for the separation of water/isopropanol and water/1,4‐dioxane.

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Polyelectrolyte complex membranes made of chitosan—PSSAMA for pervaporation separation of industrially important azeotropic mixtures

Cited by 37 publications

References 52 publications

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

Tuning the charge of polyelectrolyte complex membranes preparedviaaqueous phase separation

Converting waste polystyrene foam into new value‐added materials: A large‐capacity scavenger to remove cationic dyes and heavy metals

Modification of highly brittle polystyrene sulfonic acid‐co‐maleic acid crosslinked sodium alginate membrane into flexible membranes by the incorporation of dibutyl phthalate as a plasticizer for pervaporation separation

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