Cited by 109Thermochemical Biomass Conversion ProcessesCatalysts for Methane ReformingMicroplastics and Plastic Pollution

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Conversion of Waste Plastic Packings to Carbon Nanomaterials: Investigation into Catalyst Material, Waste Type, and Product Applications

Yao, Dingding, Li, He, Mohan, Babu Cadiam, Prabhakar, Arun Kumar, Dai, Yanjun, Wang, Chi-Hwa·2022·ACS Sustainable Chemistry & Engineering

DOI 10.1021/acssuschemeng.1c05945

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Abstract

Waste plastics collected from local food courts were catalytically pyrolyzed and decomposed to produce carbon nanomaterials (CNMs) as well as hydrogen-rich gases as byproducts in this work. A series of bimetallic catalysts: Co–Fe, Co–Ni, and Fe–Ni with MgO as the catalyst support were synthesized and compared for the process. Products including high value-added carbon nanomaterials and gases were characterized to evaluate the activity of each bimetallic catalyst. In addition, products from four types of plastic: LDPE-plastic bags for bagging, PP-plastic bottles for drinking, PS-plastic lids, and PET-mineral water bottles were further comprehensively compared in terms of yield, purity of carbon, and adsorption capacity. Results show that Fe–Ni–Mg prepared by the pH-increase precipitation method exhibited the best performance for plastic conversion, contributing to the maximum CNM yield of 30.25 wt % and hydrogen yield of 31.52 mmol/g plastic . However, the Co–Ni/MgO synthesized by impregnation gave the least activity. Regarding the different plastic types, plastic waste from LDPE bags produced hydrogen with a relatively high yield of 35.27 mmol/g plastic, while PS lid plastic resulted in a relatively high CNM yield of 38.26 wt %. It is also found that the PET bottle was not suitable for CNM production accompanied by a high content of CO 2 in product gases. The CNMs were further applied as adsorbents for wastewater treatment. The plastic-derived CNMs show strong (∼180 mg/g CNM ) adsorption capacity of metal cations such as Fe, Ag, and Ni.

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Authors: Yao, D., Li, H., Mohan, B. C., Prabhakar, A. K., Dai, Y., & Wang, C.-H.
Affiliations: National University of Singapore (SG)
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore
Shanghai Jiao Tong University (CN)
Corresponding author: Wang, Chi-Hwa
ORCID: Yao, Dingding
Prabhakar, Arun Kumar
Dai, Yanjun
Wang, Chi-Hwa
Venue: ACS Sustainable Chemistry & Engineering
Publisher: American Chemical Society (ACS)
Published: 2022-01-10
Volume: 10
Issue: 3
Pages: 1125-1136
ISSN: 2168-0485 (ISSN-L)
DOI: 10.1021/acssuschemeng.1c05945
OpenAlex: W4205340300
Cited by: 109
References: 43
Citations by year: 2026: 12 · 2025: 36 · 2024: 23 · 2023: 19 · 2022: 19
FWCI: 7.05
Type: journal article
Language: en
Open access: closed
Licence: doi.org/10.15223/policy-029 (stm-asf)
doi.org/10.15223/policy-037 (stm-asf)
doi.org/10.15223/policy-045 (stm-asf)
Locations: ACS Sustainable Chemistry & Engineering (publishedVersion)
Funders: Central University Basic Research Fund of China (510321005)
National Research Foundation Singapore (R-706-001-102-281)
National Natural Science Foundation of China (52106150)
Topics: Physical Sciences › Energy › Fuel Technology › Thermochemical Biomass Conversion Processes
Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
Keywords: plastic waste, carbon nanomaterials, catalytic pyrolysis, bimetallic catalysts, MgO support, hydrogen production, polypropylene bottles, PET bottles, metal ion adsorption

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Conversion of Waste Plastic Packings to Carbon Nanomaterials: Investigation into Catalyst Material, Waste Type, and Product Applications

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