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Environmental Impact and Degradability of Hydrogels
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Hydrogels—the water-absorbing gels used in everything from diapers to medical devices to farming—aren't all created equal when it comes to environmental impact. This review paper explains that gels made from natural materials like plant starches break down quickly and safely, while common synthetic versions can linger in soil and water for years, potentially breaking into microplastics or releasing toxic byproducts. The takeaway: as these products become more common in daily life, choosing or developing biodegradable versions matters for reducing pollution that could ultimately affect the food and water we consume.
Hydrogels are versatile polymer networks with broad applications ranging from biomedical devices and agriculture to environmental remediation. This chapter critically examines the environmental implications of hydrogel synthesis, use, and disposal, emphasizing their degradability and long-term ecological impact. Hydrogels vary widely in chemical composition, encompassing natural, synthetic, and semisynthetic polymers, each with distinct environmental footprints. Natural hydrogels derived from renewable biomass such as alginate, chitosan, gelatin, and starch exhibit rapid enzymatic degradation, making them ideal candidates for sustainable applications aligned with circular economy principles. In contrast, synthetic hydrogels, including polyacrylamide and polyacrylic acid derivatives, resist biodegradation and may persist in soils and water systems for years, posing risks of microplastic pollution and release of toxic residues like acrylamide. This chapter explores mechanisms of hydrogel degradation, including hydrolytic, enzymatic, photodegradation, and oxidative pathways, and highlights analytical methods to assess biodegradability and environmental safety. It also addresses life cycle assessments that quantify environmental impacts across raw material sourcing, manufacturing, application, and end-of-life phases. Design strategies for eco-friendly hydrogels incorporate biobased polymers, biodegradable crosslinking chemistries, green synthesis methods, and smart degradation triggering. Regulatory frameworks governing hydrogel chemical safety, application-specific requirements, and environmental certifications are reviewed, spotlighting evolving policies around microplastics and polymer sustainability. This chapter calls for continued scientific innovation and interdisciplinary collaboration to balance hydrogel performance with environmental stewardship, fostering next-generation materials that meet societal needs without compromising planetary health.
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Hydrogel Development, Processing and Applications in Agriculture: A Review
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This review examines biodegradable hydrogels derived from natural polymers as replacements for conventional petroleum-based superabsorbent hydrogels used in agriculture, which persist in soils and contribute to microplastic formation. The transition to biopolymer-based hydrogels is directly relevant to microplastic pollution because synthetic soil conditioners and controlled-release systems are an underappreciated source of agricultural microplastic accumulation.
Polymeric Hydrogels in Agriculture: Environmental Performance, Sustainability Challenges, and Future Perspectives
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A review assessed the environmental performance and degradation behavior of polymeric hydrogels used in agriculture as soil moisture-retaining agents. The study raises concerns about whether these materials break down safely or contribute to microplastic accumulation in farmland soils.
Smart and Controlled-release Hydrogels for Fertilizer and Pesticide Delivery: A Comparative Review of Synthetic and Bio-based Systems
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This review paper compares "smart" gel materials that could replace traditional fertilizers and pesticides by releasing them slowly and precisely, cutting down on runoff into our water supply. Plant-based gels break down naturally and are safer for the environment, but synthetic gels—while working better—can stick around in soil and contribute to microplastic pollution, a growing concern for human health since these tiny plastic particles can end up in our food and water. The research suggests combining both types could offer the best of both worlds, though more real-world testing is needed before these products hit farms at scale.
Author comment: Superabsorbent polymers in soil: The new microplastics? — R0/PR1
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This paper introduces a review examining whether superabsorbent polymers (like those in disposable diapers and agricultural gels) should be considered as a new category of microplastics in soil. Superabsorbent polymers are widespread in consumer products and agriculture, and their environmental fate raises questions similar to those surrounding conventional microplastics.
Hydrogel-based nanocomposites for enhanced environmental remediation
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A review covered hydrogel-based nanocomposites engineered to adsorb and remove pollutants including microplastics from water. These materials show promise as efficient, tunable sorbents for environmental remediation applications.
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