Transfiguration of discarded PVDF ultrafiltration membranes: Optimization of pyrolysis parameters for high-value char production

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2024-10-09 DOI:10.1016/j.wasman.2024.09.033

Isabel Pereira da Silva , Ali Maged , Victoria Pinheiro Lima Abreu , Ana Luisa Quintanilha Candido , Sônia Denise Ferreira Rocha , Eduardo Coutinho de Paula

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引用次数: 0

Abstract

Disposing vast amounts of non-biodegradable wastes presents engineering and economic challenges to environmental management globally. Concomitantly, recycling and upcycling of non-biodegradable materials can play a crucial role in sustainable waste management, reducing the need for raw material extraction and energy-intensive manufacturing. Accordingly, this study aimed to explore the utilization of discarded polyvinylidene fluoride (PVDF) ultrafiltration membranes for char production via optimized pyrolysis. The Generalized Reduced Gradient (GRG) optimization method was applied to predict the optimal final temperature (T) and residence time (t) to achieve the maximum membrane char (MC) iodine number under reasonable conditions. Factorial analysis revealed curvature in the model with a p-value of 0.001 at a 95 % confidence interval, indicating the potential applicability of the response surface method (RSM). The optimized pyrolysis (584 °C; 111 min) achieved an average yield of 31.3 ± 2.6 % of MC with an iodine number of 242.35 mg/g. The structural, surface, and textural properties of PVDF fibers and MC were extensively characterized. Thermal analysis of discarded PVDF confirmed the oxidative breakdown of the fluorinated polymer and the revocation of the C-F bond. Moreover, the Raman and FTIR spectral analysis revealed the coexistence of β- and γ- crystalline phases in the PVDF fiber. Consequently, the produced MC demonstrated superior carbon properties and high potential application for various industrial and environmental purposes, aligning with the circular economy approach for reutilizing discarded PVDF membranes.

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废弃 PVDF 超滤膜的转化：优化热解参数以生产高价值炭。

处理大量不可生物降解的废物给全球环境管理带来了工程和经济方面的挑战。与此同时，非生物降解材料的回收利用和升级再循环可在可持续废物管理中发挥重要作用，减少对原材料提取和能源密集型生产的需求。因此，本研究旨在探索如何利用废弃的聚偏二氟乙烯（PVDF）超滤膜，通过优化热解生产炭。应用广义梯度（GRG）优化方法预测了在合理条件下实现最大膜炭（MC）碘数的最佳最终温度（T）和停留时间（t）。因子分析显示，在 95% 的置信区间内，模型中的曲率 p 值为 0.001，这表明响应面法（RSM）具有潜在的适用性。优化热解（584 °C；111 分钟）的 MC 平均产率为 31.3 ± 2.6%，碘数为 242.35 mg/g。对 PVDF 纤维和 MC 的结构、表面和纹理特性进行了广泛表征。废弃 PVDF 的热分析证实了含氟聚合物的氧化分解和 C-F 键的撤销。此外，拉曼光谱和傅立叶变换红外光谱分析显示，PVDF 纤维中同时存在 β 和 γ 结晶相。因此，生产出的 MC 具有优异的碳性能，在各种工业和环境用途方面具有很高的应用潜力，符合循环经济方法，可重新利用废弃的 PVDF 膜。

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

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)