Chloe Zhang
Plastics are a significant contributor to global pollution, with an estimated eight million metric tons entering waterways each year. When plastic waste is disposed of, it breaks down into smaller and smaller pieces, eventually becoming microplastics. These microscopic plastic fragments, measuring less than 5mm, are hard to detect and are widespread in the environment. They can escape wastewater treatment plants, ending up in aquatic and marine areas, where they are ingested by wildlife and can accumulate in their bodies, causing serious health issues. Microplastics can also come from specifically designed small products like microbeads in facial scrubs or microfibers in clothing. Researchers are working on breaking down plastics into their molecular building blocks, a process called depolymerisation, to enable genuine plastic recycling and reduce the environmental impact of plastic waste.
| Characteristics | Values |
|---|---|
| Plastic breakdown process | Depolymerisation |
| Plastic breakdown agent | Catalyst-free RAFT depolymerisation approach |
| Plastic breakdown products | Monomers |
| Plastic breakdown applications | Recycling |
| Plastic breakdown challenges | High cost |
| Plastic breakdown impact | Microplastic pollution |
| Microplastic sources | Single-use plastic waste, synthetic clothing, plastic bottles, containers, microbeads |
| Microplastic environmental impact | Ingested by wildlife, accumulated in the food chain, mistaken for food by sea life |
| Microplastic solutions | Reduce single-use plastic, support policies for microfiber reduction, improve waste management, promote reusable/repairable products |
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What You'll Learn
Wear and tear, washing, sun exposure, and heat
Plastic is known for its ability to resist breaking under stress. This is due to the ductility of plastic, which allows its long, chain-like molecules to stretch and absorb energy, preventing breakage. However, certain factors such as wear and tear, washing, sun exposure, and heat can cause plastic to break down into smaller components over time.
Wear and Tear
Plastic can undergo wear and tear due to physical impacts or friction. For example, a plastic item may be dropped and bounce or flex without shattering, but this process can still cause microscopic damage to the plastic's molecular structure. Over time, repeated impacts or friction can lead to the plastic becoming brittle and breaking into smaller pieces.
Washing
Washing plastic items can also contribute to their breakdown. The mechanical action of washing, such as agitation or scrubbing, can create friction and stress on the plastic, similar to physical impacts. Additionally, if harsh chemicals or high temperatures are used during washing, they can further accelerate the breakdown process by weakening the plastic or making it more susceptible to damage.
Sun Exposure
Sunlight is a significant factor in the breakdown of plastic. Ultraviolet (UV) radiation from the sun can cause photodegradation, where the plastic's molecules are broken down by the energy from UV rays. This process makes the plastic brittle, causing it to crack, crumble, or fragment into smaller pieces. Sun exposure can also cause discoloration, fading, and oxidation, further weakening the plastic's structure.
Heat
Heat can accelerate the breakdown of plastic by increasing the molecular motion and flexibility of the material. When exposed to high temperatures, plastic molecules can move more rapidly, leading to a loss of molecular bonds and potential changes in the plastic's physical properties. This can result in the plastic becoming softer, weaker, or more prone to deformation, making it more susceptible to breaking into smaller components under stress or impact.
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Microplastics and nanoplastics
Plastics, when exposed to biological, chemical, and environmental elements, break down into microplastics and nanoplastics. Microplastics are microscopic plastic fragments, no more than 5mm long, that are hard to detect and are found everywhere. They are produced by the wear and tear of plastics, as well as exposure to washing, sun, and heat over time. Some microplastics are small by design, such as microbeads in facial scrubs and microfibers in polyester clothing.
Nanoplastics, on the other hand, are even smaller, typically less than 1 micron in size. For reference, the diameter of a human hair is about 70 microns. A single microplastic particle can break down into billions of nanoplastic particles, suggesting that nanoplastic pollution will be prevalent worldwide. Nanoplastics, due to their minuscule size, can permeate through biological membranes and may enter the human body through ingestion of contaminated food and water, inhalation of airborne particles, or absorption through the skin from personal care products.
The presence of nanoplastics in the environment and food does not violate FDA regulations unless it poses a health risk. While studies have found microplastics and nanoplastics in human samples, including urine, stool, blood, and organs, there is insufficient evidence to determine their potential health effects. The FDA continues to monitor research on the presence of these particles in food and will take regulatory action if a health risk is identified.
The widespread presence of microplastics and nanoplastics in the environment is a growing concern, with an estimated eight million metric tons of plastic polluting waterways annually, and this number is expected to triple by 2040. The majority of this pollution comes from countries lacking proper waste management infrastructure, particularly in Southeast Asia. The issue is further exacerbated by the limited recycling and incineration of plastic waste, leading to plastic accumulation in landfills and the environment.
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Depolymerisation
Plastics are polymers, which are long chains of molecules that bond together. Plastics do not break down, but they break up into smaller and smaller pieces, eventually becoming microplastics. These microplastics are microscopic plastic fragments, no more than 5 millimetres long, and are found everywhere, including in our bodies.
The process of depolymerisation starts with sorting and preparing plastic waste for further processing. The next step involves using specific chemical, solvent, and heat combinations to break down the polymers into monomers. After this, potential contaminants are removed from the monomers. Finally, the monomers are fed back into the plastic production process.
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Microfibres from synthetic clothing
Plastics, left alone, do not break down; they break up. Wear and tear, washing, sunlight, and heat can slowly turn plastics into smaller pieces, eventually becoming microplastics. These microscopic plastic fragments, no more than 5 millimetres long, are hard to detect and are widespread. Microplastics can easily end up in water, on farmland, in our food and water supply, and inside our bodies. They have even been found in the remote Pyrenees mountain range and at the bottom of the Mariana Trench.
Synthetic clothing made from plastics, such as polyester, nylon, and Lycra, shed microfibers, which are a type of microplastic. These microfibers are released from clothing during normal wear and are also stripped away during washing. A study by Patagonia and the University of California, Santa Barbara, found that an average of 1.7 grams of microfibers are released during the washing of synthetic jackets. These microfibers travel to wastewater treatment plants, where they enter rivers, lakes, and oceans, contributing to plastic pollution.
Textiles are estimated to produce 35% of the microplastic pollution in the oceans, making them the largest known source of marine microplastic pollution. Synthetic fleece is one of the biggest microfiber shedders, and older synthetic clothing tends to shed more microfibers. Microfibers from synthetic clothing have been found in food, bottled water, tap water, beer, and sea salt.
To reduce the impact of microfibers from synthetic clothing, individuals can opt for clothing made with natural fibers, such as organic cotton, whenever possible.
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Plastic waste management
Reduce Plastic Usage
The most effective way to address plastic waste is to reduce plastic usage in the first place. Individuals can make conscious choices, such as avoiding single-use plastics like bottled water, straws, bags, and disposable cutlery. They can also support companies that utilize reusable or compostable components in their products. Additionally, governments and industries can play a significant role by implementing policies and frameworks that promote a circular economy, reducing the demand for single-use plastics, and encouraging the development of eco-friendly alternatives.
Recycling and Proper Waste Management
Recycling plastic is crucial, but it should be complemented by proper waste management practices. While recycling rates vary across locations, it is important to follow the guidelines provided by local municipalities. Polyethylene terephthalate (PET), a common plastic in water and soda bottles, can be recycled into new products like polyester fabric or automotive parts. However, the recycling process for plastic often involves crushing and grinding, which degrades the quality of the material over time. Therefore, it is essential to explore alternative recycling methods, such as using enzymes to break down plastic into its molecular building blocks for genuine recycling.
Biodegradable Plastics and Alternative Materials
Biodegradable plastics have been introduced as an eco-friendly alternative to traditional plastics. These materials can be broken down by microbes without producing harmful methane gas. However, it is important to note that biodegradable plastics still need to be properly disposed of and managed. Additionally, individuals can opt for reusable items whenever possible, such as cloth diapers instead of disposable ones, or choosing metal or stainless steel packaging over plastic, as these materials are more environmentally friendly and can be endlessly recycled.
Research and Innovation
Scientific research and innovation play a pivotal role in tackling plastic waste. The discovery of plastic-eating bacteria and the use of enzymes to break down plastic hold promise for the future. While these developments are encouraging, it is important to recognize that they are still in the early stages of research and may not provide an immediate solution. Continued exploration of new recycling processes, such as depolymerisation to recover monomers, is essential to finding effective solutions for managing plastic waste.
Corporate Responsibility and International Cooperation
Large producers of single-use plastics, such as Coca-Cola, Nestlé, and Unilever, have a significant environmental impact. Policies and frameworks that increase corporate responsibility for waste management, such as bottle bill laws, can help spur action from private industries. Additionally, international cooperation is crucial, as plastic waste is a global issue. The forthcoming global plastics treaty is an example of an initiative that can drive change and encourage proper waste management practices worldwide.
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Frequently asked questions
Plastics break down into smaller components through a process of depolymerisation, which breaks down polymer chains to recover their individual building blocks, known as monomers.
Monomers are the molecular building blocks of polymers.
Polymers are chains of molecules that bond together and form the basis of everyday plastics, such as PET and polyurethane.
The breakdown of plastics into microplastics can have serious environmental and health consequences. Microplastics are ingested by wildlife and can accumulate inside their bodies, causing health issues. They are also hard to detect and can spread throughout the environment, including in water, soil, and the air.
Microplastics are small plastic particles, measuring less than 5 millimeters in size, that are formed when larger pieces of plastic break down over time. They are often designed to be micro-sized, such as microbeads in facial scrubs or microfibers in clothing.
