Long-Term Releasing Kinetics of Chromium from Leather

IF 0.6 4区工程技术 Q4 CHEMISTRY, APPLIED

Journal of The American Leather Chemists Association Pub Date : 2021-12-01 DOI:10.34314/jalca.v116i12.4688

Wenjun Long, Liangqiong Peng, Xiaofeng Jiang, Faming He, Wenhua Zhang

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引用次数: 0

Abstract

The release of chromium from leather inevitably results in potential risks and this study is conducted to investigate the long-term releasing behavior. The leaching tests proceed using water at solid to liquid ratio of 1:20 and rotational speed 60 r/min for 240 hours to simulate the release of chrome leather under natural conditions. The experimental data successfully fit with the Pseudo-second-order equation, Elovich equation, and Weber-Morris model, indicating the long-term leaching behavior of chromium in heterogeneous leather is controlled by liquid-solid film, while the interparticle and intraparticle diffusion also play important roles. The leachable chromium accounts for 2.8-4.5% total chromium in leather and increases with temperature. The Three-compartment model depicts the releasing process as rapid, slow, and very slow stages, and temperature mainly affected the very slow stage. The amount of released chromium in rapid and slow stages slightly increases with temperature, which could be used to assess the hazard of chrome leather.

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皮革中铬的长期释放动力学

皮革中铬的释放不可避免地会带来潜在的风险，本研究旨在探讨皮革中铬的长期释放行为。在料液比1:20的条件下，以60 r/min的转速进行240小时的浸出试验，模拟自然条件下铬革的释放。实验数据与拟二阶方程、Elovich方程和Weber-Morris模型拟合良好，表明铬在非均相皮革中的长期浸出行为受液-固膜控制，同时颗粒间和颗粒内的扩散也起重要作用。革中可浸铬占总铬的2.8 ~ 4.5%，随温度升高而升高。三室模型将释放过程分为快速、缓慢和极慢三个阶段，温度主要影响极慢阶段。随着温度的升高，快速和慢速阶段铬的释放量略有增加，可以用来评价铬革的危害。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The American Leather Chemists Association 工程技术-材料科学：纺织

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

3 months

期刊介绍： The Journal of the American Leather Chemists Association publishes manuscripts on all aspects of leather science, engineering, technology, and economics, and will consider related subjects that address concerns of the industry. Examples: hide/skin quality or utilization, leather production methods/equipment, tanning materials/leather chemicals, new and improved leathers, collagen studies, leather by-products, impacts of changes in leather products industries, process efficiency, sustainability, regulatory, safety, environmental, tannery waste management and industry economics.