Pyrolysis behaviour and kinetic analysis of waste polylactic acid composite reinforced with reed straw processing residue

IF 6.4 3区环境科学与生态学 Q2 ENERGY & FUELS

Carbon Resources Conversion Pub Date : 2024-01-26 DOI:10.1016/j.crcon.2024.100226

Bo Chen , Sen Ma , Sachin Kumar , Zhitong Yao , Wanqi Feng , Jianbo Zhao , Xu Zhang , Di Cai , Hui Cao , Ian Watson

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引用次数: 0

Abstract

The lignocellulose reinforced composites are commonly used sustainable materials with good mechanical and physical properties. Aiming to properly dispose and recover the potential value of discarded lignocellulose reinforced composites, the pyrolysis behaviour and kinetics of reed straw processing residual/polylactic acid (RSPR/PLA) composites, a typical 3D printing material, was investigated. Based on the TG-FTIR results, the synergistic effects between RSPR and PLA during the pyrolysis process were clarified. Compared with the FTIR spectra of PLA, the absorption peaks of CO and CO₂ disappear in the FTIR spectra of RSPR/PLA composite, which indicates RSPR provides additional free radicals for the free radical reaction of PLA, and further promoting the decomposition. The apparent activation energy of the RSPR/PLA composite pyrolysis was calculated by two iso-conversional methods including Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The average E_a of the RSPR/PLA composite (122.6 kJ mol⁻¹ (FWO) and 117.9 kJ mol⁻¹ (KAS)) was lower than that of solo pyrolysis of RSPR (138.5 kJ mol⁻¹ (FWO) and 135.4 kJ mol⁻¹ (KAS)) and the pure PLA (197.0 kJ mol⁻¹ (FWO) and 196.6 kJ mol⁻¹ (KAS)). The master plot method results suggested the pyrolysis of RSPR/PLA composite followed the one-dimensional (D1) diffusion model. This work provides an environmentally friendly strategy to effective thermo-chemical upgrading of the value of discarded lignocellulose reinforced composite material.

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用芦苇秆加工残渣增强废弃聚乳酸复合材料的热解行为和动力学分析

木质纤维素增强复合材料是常用的可持续材料，具有良好的机械和物理性能。为了妥善处理废弃的木质纤维素增强复合材料并回收其潜在价值，研究人员对芦苇秆加工剩余物/聚乳酸（RSPR/PLA）复合材料（一种典型的 3D 打印材料）的热解行为和动力学进行了研究。基于 TG-FTIR 结果，阐明了热解过程中 RSPR 和聚乳酸之间的协同效应。与聚乳酸的傅立叶变换红外光谱相比，RSPR/PLA 复合材料的傅立叶变换红外光谱中 CO 和 CO2 的吸收峰消失了，这表明 RSPR 为聚乳酸的自由基反应提供了额外的自由基，进一步促进了聚乳酸的分解。通过 Flynn-Wall-Ozawa (FWO) 和 Kissinger-Akahira-Sunose (KAS) 两种等转换法计算了 RSPR/PLA 复合材料热解的表观活化能。RSPR/PLA 复合材料的平均 Ea（122.6 kJ mol-1 (FWO) 和 117.9 kJ mol-1 (KAS)）低于 RSPR 单独热解的平均 Ea（138.5 kJ mol-1 (FWO) 和 135.4 kJ mol-1 (KAS)）和纯 PLA 的平均 Ea（197.0 kJ mol-1 (FWO) 和 196.6 kJ mol-1 (KAS)）。主图法结果表明，RSPR/PLA 复合材料的热解遵循一维（D1）扩散模型。这项工作为有效热化学提升废弃木质纤维素增强复合材料的价值提供了一种环境友好型策略。

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来源期刊

Carbon Resources Conversion Materials Science-Materials Science (miscellaneous)

CiteScore

9.90

自引率

11.70%

发文量

审稿时长

10 weeks

期刊介绍： Carbon Resources Conversion (CRC) publishes fundamental studies and industrial developments regarding relevant technologies aiming for the clean, efficient, value-added, and low-carbon utilization of carbon-containing resources as fuel for energy and as feedstock for materials or chemicals from, for example, fossil fuels, biomass, syngas, CO2, hydrocarbons, and organic wastes via physical, thermal, chemical, biological, and other technical methods. CRC also publishes scientific and engineering studies on resource characterization and pretreatment, carbon material innovation and production, clean technologies related to carbon resource conversion and utilization, and various process-supporting technologies, including on-line or off-line measurement and monitoring, modeling, simulations focused on safe and efficient process operation and control, and process and equipment optimization.