Polyaniline@porous polypropylene for efficient separation of acid by diffusion dialysis

Prajapati, Pradeep Kumar; Reddy, N. Naresh Kumar; Nimiwal, Raghavendra; Singh, Puyam S.; Adimurthy, Subbarayappa; Nagarale, Rajaram K.

doi:10.1016/j.seppur.2019.115989

Cited by 33 publications

(12 citation statements)

References 47 publications

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“…The observed values of average roughness and peak-to-peak separation for the PP substrate were 18.6 and 273 nm, respectively. It is well reported in the literature that the formation of a high-molecular-weight polymer in the pores of a substrate dramatically increases its surface roughness. , Recently, our group , also reported a commendable change in roughness for a polyaniline and poly(o-anisidine)-coated polypropylene support. The increased surface roughness for the PFAEM suggests the successful entrapment of poly(4-vinyl pyridine) in the voids of the porous PP substrate.…”

Section: Resultsmentioning

confidence: 99%

High-Capacity Retention Thermally Reinforced Pore-Filled Anion Exchange Membrane for All-Vanadium Flow Batteries

Sreenath

Pawar

et al. 2022

ACS Appl. Energy Mater.

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In this work, we report a thermally annealed porefilled anion exchange membrane (PFAEM) with excellent mechanical and chemical stability effected by a polypropylene support and impressive electrochemical properties induced by a pore-filled poly (4-vinyl pyridine) matrix followed by its successful demonstration in vanadium redox flow batteries (VRFBs). As expected, a low swelling ratio synergized with Donnan exclusion resulted in low vanadium ion diffusion. The calculated permeability rates for V +3 , VO 2+ , and VO 2 + were 4.80 × 10 −7 , 7.11 × 10 −7 , and 9.4 × 10 −7 dm s −1 , respectively. An exceptionally low dimension change (∼4.5%) was observed in 1.6 M VO 2 + /2 M H 2 SO 4 solution over 15 days. The assembled VRFB exhibited a Coulombic efficiency (CE) of 98.6% and energy efficiency (EE) of 69.2% over 50 charge/discharge cycles at 150 mA cm −2 with a high-capacity retention of 70% and average capacity decay of 0.63% per cycle. The observed peak power density was 340 mW cm −2 . Finally, the autopsy of the membrane after battery performance suggested negligible depreciation in mechanical and electrochemical properties, confirming its potential applicability in VRFBs.

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Section: Resultsmentioning

confidence: 99%

High-Capacity Retention Thermally Reinforced Pore-Filled Anion Exchange Membrane for All-Vanadium Flow Batteries

Sreenath

Pawar

et al. 2022

ACS Appl. Energy Mater.

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“…On the one hand, the hydrophilic/hydrophobic characteristics of the membrane could be influenced by different groups, allowing the acid permeability to be tuned. Prajapati [ 56 ] prepared two kinds of AEMs using polypropylene (PP) as the substrate: a polyaniline (PANI, Figure 4 a)-based AEM and a poly(o-anisidine) (A-PANI, Figure 4 b, see Appendix A for the abbreviations of chemicals)-based AEM. The PANI-based AEM was prepared from aniline as the monomer, while the A-PANI-based AEM was prepared from ortho-anisidine as the monomer.…”

Section: Acid Permeabilitymentioning

confidence: 99%

“… The structure of ( a ) PANI, ( b ) A-PANI, ( c ) Methylpyrrolidine, ( d ) TMA, ( e ) PMG, ( f ) MP, ( g ) PPO [ 50 , 56 , 60 , 61 ]. …”

Section: Figurementioning

confidence: 99%

Diffusion Dialysis for Acid Recovery from Acidic Waste Solutions: Anion Exchange Membranes and Technology Integration

Zhang

Wang

2020

Membranes

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Inorganic acids are commonly used in mining, metallurgical, metal-processing, and nuclear-fuel-reprocessing industries in various processes, such as leaching, etching, electroplating, and metal-refining. Large amounts of spent acidic liquids containing toxic metal ion complexes are produced during these operations, which pose a serious hazard to the living and non-living environment. Developing economic and eco-friendly regeneration approaches to recover acid and valuable metals from these industrial effluents has focused the interest of the research community. Diffusion dialysis (DD) using anion exchange membranes (AEMs) driven by an activity gradient is considered an effective technology with a low energy consumption and little environmental contamination. In addition, the properties of AEMs have an important effect on the DD process. Hence, this paper gives a critical review of the properties of AEMs, including their acid permeability, membrane stability, and acid selectivity during the DD process for acid recovery. Furthermore, the DD processes using AEMs integrated with various technologies, such as pressure, an electric field, or continuous operation are discussed to enhance its potential for industrial applications. Finally, some directions are provided for the further development of AEMs in DD for acid recovery from acidic waste solutions.

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“…Moreover, it is a thermodynamically good technology as it involves a decline in over-all Gibbs free energy and increase in entropy of the system [ 12 ]. It has been largely used in the recovery of sulphuric acid [ 13 ], hydrochloric acid [ 14 ], nitric acid [ 15 ], and a mixed acid [ 16 , 17 ]. In this process, metal ions, proton, and counter ions transfer informally from their higher concentration compartment to the lower concentration compartment because of the mass transfer concentration gradient across the ion exchange membranes (IEM) [ 12 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Higher Acid Recovery Efficiency of Novel Functionalized Inorganic/Organic Composite Anion Exchange Membranes from Acidic Wastewater

et al. 2021

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In this work, the synthesis of a series of the functionalized inorganic/organic composite anion exchange membranes (AEMs) was carried out by employing the varying amount of inorganic filler consist of N-(trimethoxysilylpropyl)-N,N,N-trimethylammonium chloride (TMSP-TMA+Cl−) into the quaternized poly (2, 6-dimethyl-1, 4-phenylene oxide) (QPPO) matrix for acid recovery via diffusion dialysis (DD) process. Fourier transform infrared (FTIR) spectroscopy clearly demonstrated the fabrication of the functionalized inorganic/organic composite AEMs and the subsequent membrane characteristic measurements such as ion exchange capacity (IEC), linear swelling ratio (LSR), and water uptake (WR) gave us the optimum loading condition of the filler without undesirable filler particle aggregation. These composite AEMs exhibited IEC of 2.18 to 2.29 meq/g, LSR of 13.33 to 18.52%, and WR of 46.11 to 81.66% with sufficient thermal, chemical, and mechanical stability. The diffusion dialysis (DD) test for acid recovery from artificial acid wastewater of HCl/FeCl2 showed high acid DD coefficient (UH+) (0.022 to 0.025 m/h) and high separation factor (S) (139-260) compared with the commercial membrane. Furthermore, the developed AEMs was acceptably stable (weight loss < 20%) in the acid wastewater at 60 °C as an accelerated severe condition for 2 weeks. These results clearly indicated that the developed AEMs have sufficient potential for acid recovery application by DD process.

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Polyaniline@porous polypropylene for efficient separation of acid by diffusion dialysis

Cited by 33 publications

References 47 publications

High-Capacity Retention Thermally Reinforced Pore-Filled Anion Exchange Membrane for All-Vanadium Flow Batteries

High-Capacity Retention Thermally Reinforced Pore-Filled Anion Exchange Membrane for All-Vanadium Flow Batteries

Diffusion Dialysis for Acid Recovery from Acidic Waste Solutions: Anion Exchange Membranes and Technology Integration

Higher Acid Recovery Efficiency of Novel Functionalized Inorganic/Organic Composite Anion Exchange Membranes from Acidic Wastewater

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