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Targeted hexanal elimination in leather via polyethyleneimine-mediated Schiff Base chemistry: A sustainable odor control strategy.

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Title: Targeted hexanal elimination in leather via polyethyleneimine-mediated Schiff Base chemistry: A sustainable odor control strategy.
Authors: Mu, Chuanhui1 (AUTHOR), Tang, Yuling1,2 (AUTHOR) tangyuling@scu.edu.cn, Yang, Zhaohui1 (AUTHOR), Zhou, Jianfei1,2 (AUTHOR), Shi, Bi1,3 (AUTHOR)
Source: Separation & Purification Technology. Mar2026, Vol. 384, pN.PAG-N.PAG. 1p.
Subjects: Polyethyleneimine, Schiff bases, Industrial applications, Tanning (Hides & skins), Odor control, Sustainability
Abstract: Leather is the preferred material for premium sofas and automotive upholstery, and the removal of aldehyde compounds from leather is of significant importance for addressing odor issues. Current odor control strategies including adsorption, catalytic oxidation, and perfuming remain limitations of secondary pollution, matrix degradation, and poor long-term stability. Herein, we developed a simple and efficient method that used polyethyleneimine (PEI) with a large number of amino groups as the reaction reagent and adopted a spraying approach to remove hexanal through a Schiff Base reaction. The best hexanal removal rate by PEI was achieved at a spraying quantity of 400 g/m2, concentration of 1.5 %, Mw of 70,000, and pH 4, resulting in a substantial improvement of leather odor scale. Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) and Density Functional Theory (DFT) calculations revealed that the Schiff Base reaction between PEI and hexanal appear to be the main mechanism of hexanal elimination, accompanied by hydrogen bonding. The characterization of leather physicochemical properties before and after treatment indicated that PEI spraying barely affected leather performance. Further, this treatment demonstrated non-toxicity, long-term stability, superior performance, and economic cost indicating the viability for practical application in industrial leather treatment. Generally, these results confirmed the PEI-based strategy could provide a practical and sustainable approach for leather odor improvement, offering new insights into aldehyde scavenging mechanism by aqueous system. [Display omitted] • Novel PEI spraying strategy for hexanal elimination to improve leather odor scale. • QCM-D and DFT confirm Schiff Base reaction and hydrogen bonding. • Treatment preserves leather physicochemical properties without damage. • Practical and eco-friendly method for hexanal scavenging in leather manufacturing. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Leather is the preferred material for premium sofas and automotive upholstery, and the removal of aldehyde compounds from leather is of significant importance for addressing odor issues. Current odor control strategies including adsorption, catalytic oxidation, and perfuming remain limitations of secondary pollution, matrix degradation, and poor long-term stability. Herein, we developed a simple and efficient method that used polyethyleneimine (PEI) with a large number of amino groups as the reaction reagent and adopted a spraying approach to remove hexanal through a Schiff Base reaction. The best hexanal removal rate by PEI was achieved at a spraying quantity of 400 g/m2, concentration of 1.5 %, Mw of 70,000, and pH 4, resulting in a substantial improvement of leather odor scale. Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) and Density Functional Theory (DFT) calculations revealed that the Schiff Base reaction between PEI and hexanal appear to be the main mechanism of hexanal elimination, accompanied by hydrogen bonding. The characterization of leather physicochemical properties before and after treatment indicated that PEI spraying barely affected leather performance. Further, this treatment demonstrated non-toxicity, long-term stability, superior performance, and economic cost indicating the viability for practical application in industrial leather treatment. Generally, these results confirmed the PEI-based strategy could provide a practical and sustainable approach for leather odor improvement, offering new insights into aldehyde scavenging mechanism by aqueous system. [Display omitted] • Novel PEI spraying strategy for hexanal elimination to improve leather odor scale. • QCM-D and DFT confirm Schiff Base reaction and hydrogen bonding. • Treatment preserves leather physicochemical properties without damage. • Practical and eco-friendly method for hexanal scavenging in leather manufacturing. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.136287