Removal of polyethylene terephthalate plastics waste via Co–CeO2 photocatalyst–activated peroxymonosulfate strategy

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2023-11-29 DOI:10.1016/j.cej.2023.147781

Yang Wan, Huijie Wang, Jiejing Liu, Jinze Li, Weiqiang Zhou, Jisheng Zhang, Xin Liu, Xianghai Song, Huiqin Wang, Pengwei Huo

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引用次数: 0

Abstract

Polyethylene terephthalate (PET) plastic, widely used for packaging owing to its excellent properties, has become a major contributor to plastic waste, for which satisfactory recycling and upgrading treatment technologies are lacking. In this study, Co-doped CeO₂ was used as a photocatalyst to degrade PET plastics in water, and PET degradation was measured according to the weight loss rate. Peroxymonosulfate (PMS) addition to the photocatalytic system enabled the degradation of 53.82 ± 4.48 % of PET plastics, highlighting the excellent PET plastic degradation capability of the photocatalytic PMS system. The study investigated the effects of the catalyst-to-plastic ratio, PMS concentration, initial pH, inorganic anions, humic acid concentration, and hydrogen peroxide (H₂O₂) addition on the catalytic oxidation system. Contrast experiments revealed that H₂O₂ addition to the photocatalysis/PMS oxidation system further improved the PET plastic degradation efficiency (91.61 ± 1.50 %). Liquid product analysis, electron paramagnetic resonance, and free radical quenching experiments confirmed that SO₄⁻ played the most significant role in PET degradation. Finally, a possible mechanism for the degradation of PET plastics in water using the photocatalysis/PMS oxidation system was proposed.

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Co-CeO2光催化剂活化过氧单硫酸脱除聚对苯二甲酸乙二醇酯塑料废弃物

聚对苯二甲酸乙二醇酯(PET)塑料因其优异的性能被广泛用于包装，已成为塑料废物的主要来源，但缺乏令人满意的回收和升级处理技术。本研究采用共掺杂CeO2作为光催化剂，在水中降解PET塑料，并根据失重率测定PET降解率。光催化体系中加入过氧单硫酸根(PMS)后，PET塑料的降解率为53.82 ± 4.48 %，突出了光催化PMS体系对PET塑料的优异降解能力。研究了媒塑比、PMS浓度、初始pH、无机阴离子、腐植酸浓度、过氧化氢(H2O2)添加量对催化氧化体系的影响。对比实验表明，在光催化/PMS氧化体系中加入H2O2进一步提高了PET塑料的降解效率(91.61 ± 1.50 %)。液相产物分析、电子顺磁共振和自由基猝灭实验证实，SO4−在PET降解中起着最显著的作用。最后，提出了光催化/PMS氧化体系在水中降解PET塑料的可能机理。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.