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- In relation to this article, we declare that there is no conflict of interest.
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Received September 16, 2024
Accepted May 1, 2025
Available online May 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Investigation on SLM’s Stability via the Mutual Solubility of Diff erent Water pH + TOA + Organic Solvents and DFT Calculation
https://doi.org/10.1007/s11814-025-00435-y
Abstract
This work presents the infl uence of water pH on the stability of supported liquid membrane (SLM) regards its mutual solubility.
For the solubility experiments, both liquid–liquid binary and ternary systems are studied in diff erent water pH (2.0,
7.0, and 13.0) at 303.15 K and atmospheric pressure. In the organic phase, tri- n -octylamine (TOA) combined with various
organic solvents is used; adjusted pH water is used in the aqueous phase. Results demonstrate that, in the organic phase,
basic water reveals the least solubility. Data correlation utilizing the NRTL model fi tted in well with the experimental data
as validated by < 5% RMSD. For the interaction molecular study of the involved molecules, density function theory (DFT)
is carried out. Application of the hollow fi ber-supported liquid membrane (HFSLM) shows that stability is aff ected by the
solubility of diff erent pH water. It is noted that the basic-based feed provides the longest stability, which is consistent with
the solubility results.
