Abstract
Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.
Highlights
Nowadays, a large quantity of acid waste has been generated by many industries [1,2]
The formulation of a sequence of homogeneous anion exchange membranes based on BPPO with varying physico–chemical characteristics has been revealed by altering the amount of triphenylphosphine through the use of the solution casting method into the polymer matrix
The acid recovery performance of the synthesized BPPO-based anion exchange membranes was revealed via a diffusion dialysis process in a two-compartment cell as reported in our previous work [35,38,39,49]
Summary
A large quantity of acid waste has been generated by many industries [1,2]. ). In this paper, the formulation of a sequence of homogeneous anion exchange membranes based on BPPO with varying physico–chemical characteristics has been revealed by altering the amount of triphenylphosphine (shown in Figure 3) through the use of the solution casting method into the polymer matrix. The formulation of a sequence of homogeneous anion exchange membranes based on BPPO with varying physico–chemical characteristics has been revealed by altering the amount of triphenylphosphine (shown in Figure 3) through the use of the solution casting method into the polymer matrix The solution casting method was utilized for the synthesis of BPPO-based anion exchange membranes as reported in our previous research [35,43,44,45,46,47]. LDRY where LWET and LDRY show wet and dry lengths of membrane samples, respectively
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