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Thermal conversion of waste cigarette butts: Feedstock heterogeneity, process control, valorization pathways, and environmental safety: A critical review.
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This review summarizes existing research on heating cigarette butts to break them down, since their plastic filters shed microplastic fibers and leach toxic chemicals. It describes how heating releases substances like acetic acid, phenols, and nicotine, forming oil, gas, or char, but notes that heating does not necessarily remove all toxic components and complete data on their distribution are still missing.
Waste cigarette butts are abundant and widely dispersed composite solid wastes worldwide. They consist of cellulose acetate filters, residual tobacco, cigarette paper, ash, and carry nicotine, polycyclic aromatic hydrocarbons (PAHs), and heavy metals. During weathering, cellulose acetate filters release microfibers and contribute to microplastic pollution, while toxic components migrate into aquatic and soil environments. Conventional landfilling, incineration, and recycling fail to achieve pollution control and resource recovery. This review focuses on the thermal conversion of waste cigarette butts. It compares feedstock heterogeneity, reaction mechanisms, and the effects of different processes on product formation and toxic-component migration, with the aim of assessing resource-recovery feasibility and environmental safety. During thermal conversion, additives such as triacetin first undergo thermal desorption. Cellulose acetate then undergoes deacetylation and backbone cleavage, producing acetic acid and oxygenated volatiles. Cigarette paper releases phenols and aromatic compounds, while residual tobacco releases nicotine, pyridine, and other nitrogen-containing compounds. Volatiles may condense into pyrolysis oil or undergo cracking, reforming, or gasification into syngas at higher temperatures and under controlled atmospheres or catalytic conditions. The remaining carbon framework forms solid char through condensation, aromatization, and structural rearrangement. Different routes are oriented toward different products, but thermal conversion does not necessarily eliminate toxic components. Complete mass-balance data on their distribution among gas, oil, char, ash, and wastewater remain unavailable. Future studies should strengthen feedstock standardization, validation under realistic and continuous operating conditions, and life-cycle and techno-economic assessments, so that the environmental constraints and engineering requirements of waste cigarette butt thermal conversion can be defined more clearly.
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Researchers reviewed the environmental pollution caused by the use and disposal of cigarettes and electronic cigarettes, including their role as a source of microplastic contamination. Cigarette butts made of cellulose acetate are minimally degradable and represent a major source of both bulk plastic and microplastic pollution, particularly in aquatic ecosystems. The study documents that cigarette butt leachate and nicotine are toxic to a wide range of organisms from microbes to mammals.
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This review examines the environmental impact of discarded cigarette butts, which number in the trillions worldwide each year and are among the most common litter items. Researchers found that cigarette filters release harmful substances including heavy metals, nicotine, and cellulose acetate microplastic fibers when they enter water. The study highlights that cigarette butt pollution represents a significant but often overlooked source of both chemical contamination and microplastic pollution in aquatic environments.
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This review of existing research shows that cigarette butts are the world's most common plastic trash, slowly breaking down into tiny plastic fibers that spread harmful chemicals like nicotine and heavy metals into water and soil. These microplastics hurt fish and other animals by changing their behavior and building up in their bodies, which could affect the entire food chain. Since humans eat fish and use water from these contaminated environments, cigarette butt pollution may pose health risks that need more research and better cleanup solutions.
Pyrolysis kinetic behaviour, TG-FTIR, and GC/MS analysis of cigarette butts and their components
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Pyrolysis experiments on cigarette butts and their components showed thermochemical conversion can produce aromatic hydrocarbons, carbonyl compounds, and phenols from the cellulose acetate filter—a major source of microplastic pollution. With trillions of cigarette butts discarded annually as the world's most littered plastic, understanding their thermal decomposition is essential for developing recycling alternatives that prevent cellulose acetate from fragmenting into persistent microplastic fibers.
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