<p>Coconut coir, a lignocellulosic agro-industrial waste of <i>Cocos nucifera</i>, is extremely promising for the development of sustainable materials because of its lignin and cellulose content, biodegradability, and mechanical properties. High lignin content helps provide strength and resistance to heat, but on the other hand, it makes biochemical conversion difficult, including bioethanol production because enzymes can have difficulty accessing the cellulose. Although worldwide coconut production is over 60&#xa0;million metric tons each year, much of the coir is not being exploited in a viable way, leading to environmental degradation and lost economic benefits. This thorough review spotlights the emerging trends in the valorisation of coconut coir in a number of different fields, such as green chemistry based fractionation, bioenergy, bioplastics, biomedical materials, carbon capture, and environmental remediation. The recent improvements in pretreatment technology such as enzymatic pretreatment, chemical pretreatment, and green solvent pretreatment have helped improve the efficiency of coir conversion to bioenergy and biorefinery. Material from coir is now being converted into biocomposites, nanocellulose, hydrogels, biochar, and conductive composites, exhibiting proven application in tissue engineering, drug delivery, energy storage, wastewater treatment, and sustainable packaging (Graphical Abstract). Moreover, coir based adsorbents and biofilters play an important role in carbon sequestration and pollution abatement. Utilization of coconut coir in a circular bioeconomy context presents not only a zero waste alternative but also facilitates climate action through the substitution of fossil based products. The objective of this review is to provide information on novel strategies for the utilization of coconut coir fiber and its impact on sustainability and circular bioeconomy. This review focuses on the latest advancements in green chemistry-based processing, materials technology, renewable energy production, and environmental restoration, along with potential avenues for future industrial applications.</p> Graphical Abstract <p></p>

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Valorisation of coconut coir for circular bioeconomy: a comprehensive review

  • Himanshu Jain,
  • Ananya Aggarwal,
  • Neeraj K. Aggarwal

摘要

Coconut coir, a lignocellulosic agro-industrial waste of Cocos nucifera, is extremely promising for the development of sustainable materials because of its lignin and cellulose content, biodegradability, and mechanical properties. High lignin content helps provide strength and resistance to heat, but on the other hand, it makes biochemical conversion difficult, including bioethanol production because enzymes can have difficulty accessing the cellulose. Although worldwide coconut production is over 60 million metric tons each year, much of the coir is not being exploited in a viable way, leading to environmental degradation and lost economic benefits. This thorough review spotlights the emerging trends in the valorisation of coconut coir in a number of different fields, such as green chemistry based fractionation, bioenergy, bioplastics, biomedical materials, carbon capture, and environmental remediation. The recent improvements in pretreatment technology such as enzymatic pretreatment, chemical pretreatment, and green solvent pretreatment have helped improve the efficiency of coir conversion to bioenergy and biorefinery. Material from coir is now being converted into biocomposites, nanocellulose, hydrogels, biochar, and conductive composites, exhibiting proven application in tissue engineering, drug delivery, energy storage, wastewater treatment, and sustainable packaging (Graphical Abstract). Moreover, coir based adsorbents and biofilters play an important role in carbon sequestration and pollution abatement. Utilization of coconut coir in a circular bioeconomy context presents not only a zero waste alternative but also facilitates climate action through the substitution of fossil based products. The objective of this review is to provide information on novel strategies for the utilization of coconut coir fiber and its impact on sustainability and circular bioeconomy. This review focuses on the latest advancements in green chemistry-based processing, materials technology, renewable energy production, and environmental restoration, along with potential avenues for future industrial applications.

Graphical Abstract