Green Salt-Free High-Exhaustion Chrome Tanning Strategy: Biomass-Derived Aldehyde Acid–Chrome Tanning

IF 3.8 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Yuxiang Zhou, Yue Yu, Hui Wang, Bi Shi, Ya-nan Wang
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Abstract

Conventional chrome (Cr) tanning systems generate substantial wastewater containing Cl and Cr3+, which presents huge environmental challenges. This study proposes a sustainable alternative, biomass-derived aldehyde acid–chrome (AA–Cr) tanning, to mitigate Cl and Cr3+ pollution. Pretanning with 3 wt % AA effectively prevented acid-induced swelling of pelts in the absence of salts at a pickling pH of 1 to 4. The dialdehyde and carboxyl groups in AA facilitated the formation of a robust AA–Cr cross-linking network. Subsequent tanning with 3 wt % chrome tanning agent led to an exceptional Cr uptake rate that exceeded 98.5%, with the AA–Cr system exhibiting superior tanning performance compared to glyoxylic acid–Cr (GA–Cr). Compared to the Cr system, the AA–Cr system achieved 89.4% and 96.3% reductions in Cl and Cr3+ loads, respectively, while exhibiting enhanced biodegradability. Life cycle assessment revealed that the AA–Cr system demonstrates remarkably lower carbon emissions, reduced resource consumption, and diminished human toxicity. This study presents a feasible strategy for salt-free, high-exhaustion chrome tanning and provides novel insights into the molecular design of biomass-derived AA.

Abstract Image

绿色无盐高耗尽铬鞣制策略:生物质衍生醛酸铬鞣制
传统的铬(Cr)鞣制系统会产生大量含有 Cl- 和 Cr3+ 的废水,给环境带来巨大挑战。本研究提出了一种可持续的替代方法,即生物质衍生醛酸铬(AA-Cr)鞣制法,以减轻 Cl- 和 Cr3+ 污染。在酸洗 pH 值为 1 至 4 的条件下,使用 3 wt % 的 AA 进行预鞣,可有效防止酸引起的颗粒膨胀。 AA 中的二醛和羧基有助于形成强大的 AA-Cr 交联网络。随后用 3 wt % 的铬鞣剂进行鞣制,铬的吸收率超过 98.5%,与乙醛酸-铬(GA-Cr)相比,AA-铬体系表现出更优越的鞣制性能。与 Cr 系统相比,AA-Cr 系统的 Cl- 和 Cr3+ 负荷分别减少了 89.4% 和 96.3%,同时还表现出更强的生物降解性。生命周期评估显示,AA-Cr 系统显著降低了碳排放量,减少了资源消耗,并降低了对人体的毒性。这项研究为无盐、高耗竭铬鞣制提供了一种可行的策略,并为生物质衍生 AA 的分子设计提供了新的见解。
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来源期刊
Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research 工程技术-工程:化工
CiteScore
7.40
自引率
7.10%
发文量
1467
审稿时长
2.8 months
期刊介绍: ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.
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