Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 137974 - 137974
Опубликована: Март 1, 2025
Язык: Английский
International Journal of Molecular Sciences, Год журнала: 2023, Номер 24(4), С. 3877 - 3877
Опубликована: Фев. 15, 2023
The accumulation of synthetic plastic waste in the environment has become a global concern. Microbial enzymes (purified or as whole-cell biocatalysts) represent emerging biotechnological tools for circularity; they can depolymerize materials into reusable building blocks, but their contribution must be considered within context present management practices. This review reports on prospective bio-recycling framework Europe. Available biotechnology support polyethylene terephthalate (PET) recycling. However, PET represents only ≈7% unrecycled waste. Polyurethanes, principal fraction, together with other thermosets and more recalcitrant thermoplastics (e.g., polyolefins) are next plausible target enzyme-based depolymerization, even if this process is currently effective ideal polyester-based polymers. To extend to circularity, optimization collection sorting systems should feed chemoenzymatic technologies treatment mixed In addition, new bio-based lower environmental impact comparison approaches developed (available new) materials, that designed required durability being susceptible action enzymes.
Язык: Английский
Процитировано
54
ChemCatChem, Год журнала: 2023, Номер 15(13)
Опубликована: Март 29, 2023
Abstract Polyolefins and especially polyethylenes (LLDPE, LDPE HDPE) polypropylene (PP) contribute a great deal to the growing amounts of plastic waste with combined production share almost 50 % by mass. While being universally applicable, they are mainly used for short‐lived packaging materials that constitute over 60 annual post‐consumer waste. Thus, disproportionately high polyolefins end up as (PCW) management strategies these particularly inert plastics needed. This necessity has promoted research effort dealing valorization discarded but, nevertheless, valuable materials. review aims highlight scientific advances made in chemical polyolefin recycling recent years, focusing, though not exclusively, on catalytic processes recycle various means at more moderate temperatures compared pyrolysis such deconstructing polymer objective upcycling mind or transformation give access functional chemicals.
Язык: Английский
Процитировано
52
Chemosphere, Год журнала: 2024, Номер 355, С. 141749 - 141749
Опубликована: Март 21, 2024
Plastic pollution has become a major global concern, posing numerous challenges for the environment and wildlife. Most conventional ways of plastics degradation are inefficient cause great damage to ecosystems. The development biodegradable offers promising solution waste management. These designed break down under various conditions, opening up new possibilities mitigate negative impact traditional plastics. Microbes, including bacteria fungi, play crucial role in bioplastics by producing secreting extracellular enzymes, such as cutinase, lipases, proteases. However, these microbial enzymes sensitive extreme environmental temperature acidity, affecting their functions stability. To address challenges, scientists have employed protein engineering immobilization techniques enhance enzyme stability predict structures. Strategies improving substrate interaction, increasing thermostability, reinforcing bonding between active site substrate, refining activity being utilized boost functionality. Recently, bioengineering through gene cloning expression potential microorganisms, revolutionized biodegradation bioplastics. This review aimed discuss most recent strategies modifying bioplastic-degrading terms functionality, thermostability enhancement, binding site, with other improvement surface action. Additionally, discovered exoenzymes metagenomics were emphasized.
Язык: Английский
Процитировано
26
Nature Chemical Engineering, Год журнала: 2025, Номер unknown
Опубликована: Фев. 17, 2025
Язык: Английский
Процитировано
3
Colloids and Interface Science Communications, Год журнала: 2023, Номер 57, С. 100754 - 100754
Опубликована: Ноя. 1, 2023
The potential of Aspergillus sp. for plastic biodegradation is a promising approach environmentally friendly waste management. Various research studies have been conducted to optimize conditions that enhance the plastics and understand genetic basis species. By performing this investigation, we discussed role various species in decomposition polymers. Most grow within pH range 4 6. 37.5% showed grows optimally at 30 °C. Scanning electron microscopy (SEM) Fourier transform infrared (FTIR) tests were used 34.61% 32.69% different studies, respectively. It has observed fungi can biodegrade polymers more effectively size 20–100 μm. (34.21%) focused on 21 days. highest percentage (44%) low-density polyethylene (LDPE) by dominant sp., including A. niger, flavus, oryzae, play significant microplastics. Enzymes such as laccase, esterase, peroxidase, lipase, urease crucial roles degradation plastics. Laccase utilizes oxygen generate reactive species, breaking polymer chains. Esterase cleaves into fragments, while peroxidase generates radicals degradation. Lipases also contribute specific substrates. In general, it be said fungal successful degrading
Язык: Английский
Процитировано
39
Journal of Environmental Sciences, Год журнала: 2023, Номер 142, С. 169 - 181
Опубликована: Июнь 19, 2023
Bioplastics were first introduced as environmentally friendly materials, with properties similar to those of conventional plastics. A bioplastic is defined biodegradable if it can be decomposed into carbon dioxide under aerobic degradation, or methane and CO2 anaerobic conditions, inorganic compounds, new cellular biomass, by the action naturally occurring microorganisms. This definition however does not provide any information on environmental timescale extent at which decomposition processes should occur. With regard aquatic environment, recognized standards have been established assess ability plastics undergo biodegradation; however, these fail clear targets met allow labelling a biodegradable. Moreover, grant user an extensive leeway in choice process parameters. For reasons, comparison results deriving from different studies challenging. The authors analysed discussed degree biodegradability series bioplastics environments (both fresh salt water) using obtained laboratory on-site testing context research studies. Biochemical Oxygen Demand (BOD), evolution, surface erosion weight loss main parameters used researchers describe percentage biodegradation. showed large variability both BOD, even when evaluating same type bioplastics. confirms need for reference range values applied defining
Язык: Английский
Процитировано
33
Environmental Technology & Innovation, Год журнала: 2023, Номер 32, С. 103273 - 103273
Опубликована: Июль 7, 2023
The production of synthetic plastics, especially polyethylene, has reached a crucial level, making highly challenging plastic waste management. This paper aims to elucidate the role two novel laccase-like multicopper oxidases in polyethylene oxidative degradation based on transcriptomic data from Rhodococcus opacus R7 grown polyethylene. purification recombinant proteins, LMCO2 and LMCO3 belonging respectively three- two-domains laccase families, showed that they are endowed with different functional features. highest enzyme activity at 65 °C an optimal pH 7.0, while exhibited 80 acidic pH. LMCOs both phenolic (i.e., 2,6-DMP) non-phenolic ABTS) compounds were thermostable. untreated low-density was assessed by combining Fourier transform infrared spectroscopy gas chromatography coupled mass spectrometry analyses. Oxidation PE recorded within short time range (24-48 h) revealed previously not described patterns alkyl oxygenated products including ketones, alcohols, carboxylic acids. Structural analysis together density theory calculations allowed identify structural electronic elements presumably involved oxidation
Язык: Английский
Процитировано
33
Опубликована: Янв. 1, 2024
Язык: Английский
Процитировано
15
Water Air & Soil Pollution, Год журнала: 2024, Номер 235(3)
Опубликована: Март 1, 2024
Abstract Microplastics (MPs) have become an important concern among scientists and policymakers all around the globe. Despite this, contribution of MPs to global warming climate change, a significant aspect issue, has been overlooked. Continuous greenhouse gas (GHG) emissions resulting in change long major issue with apparent consequences. Climate plastic crises are threatening our planet, co-occurrence both would be catastrophic. This article addressed links between microplastic pollution change; how contribute by interacting water, air, soil; recommendations address issues together. Throughout their lives, plastics emit GHG. water impede mitigation potential ocean different ways; they hamper photosynthesis carbon sequestration phytoplankton Blue Carbon Ecosystem. induce GHG from soil. Airborne aid cloud formation interfere atmospheric cooling. change–induced extreme events redistribute environment, causing increase vertically horizontally, which then aggravates situation feedback loop. The evidence acquired study implies that inextricably linked play vital role fueling change. bridges gap were previously regarded separately. Due linkages these intertwined challenges, integrated holistic research policy measures required concurrently.
Язык: Английский
Процитировано
13
Chemical Engineering Journal, Год журнала: 2024, Номер 484, С. 149703 - 149703
Опубликована: Фев. 17, 2024
Язык: Английский
Процитировано
11