In this paper,a simple method to plate a hydrophobic coating on the inner surface of a small-scaled tube was proposed,where the coating consisted of carbon microspheres.Three common plastics polystyrene,polycarbonate ...In this paper,a simple method to plate a hydrophobic coating on the inner surface of a small-scaled tube was proposed,where the coating consisted of carbon microspheres.Three common plastics polystyrene,polycarbonate and polyethylene were used as the feedstocks to be processed in supercritical water in a quartz tubular reactor.After reaction,the contact angle of droplet on the inner surface of the quartz tube was turned out to be over 100°,significantly larger than that of the blank tube 54°.When processing polystyrene in the 750℃ supercritical water for 10 min,the largest contact angle was obtained,up to 145°.Besides,in this sample,the size of carbon spheres was smallest,about 2.09μm diameter on average.When comparing among different types of plastics under the same condition,the contact angle of surface made from PC took the dominant position over that of PS and PE,124°,100°and 90°,respectively.In the sample made from PC,carbon spheres adhered into a mountainlike shape,producing a binary geometric structure.Furthermore,this research could be helpful in the discussion of plastic waste management and carbon spheres fabrication with low cost.展开更多
Traditional disposal methods of biomass and plastic waste,such as landfill,combustion,and compost,no longer meet the requirements of carbon reduction,carbon neutrality,and sustain-able society due to low utilization e...Traditional disposal methods of biomass and plastic waste,such as landfill,combustion,and compost,no longer meet the requirements of carbon reduction,carbon neutrality,and sustain-able society due to low utilization efficiency and severe pollution.As a green,efficient and environmentally-friendly method,hydrothermal technology has been paid much attention to and has already been applied to recycle or reuse various plastic and biomass wastes.No matter for the single or mixed type of waste,it is expected to achieve efficient recycling and obtain value-added products through the hydrothermal process.This review summarized the basic knowledge of hydrothermal technology and the possible reaction mechanism of biomass and plastics un-der hydrothermal conditions and listed the previous reports on the application of hydrothermal technology for converting wastes of biomass,plastic,and biomass/plastic mixtures to solid fuels.Moreover,regarding the future of hydrothermal technology,four points related to reaction mech-anism,synergistic effect,catalysis,and scaled-up application,were provided for consideration.展开更多
基金This work is supported by the National Key R&D Program of China(2020YFA0714400)Shaanxi Science&Technology Co-ordination&Innovation Project(2021GY-164).
文摘In this paper,a simple method to plate a hydrophobic coating on the inner surface of a small-scaled tube was proposed,where the coating consisted of carbon microspheres.Three common plastics polystyrene,polycarbonate and polyethylene were used as the feedstocks to be processed in supercritical water in a quartz tubular reactor.After reaction,the contact angle of droplet on the inner surface of the quartz tube was turned out to be over 100°,significantly larger than that of the blank tube 54°.When processing polystyrene in the 750℃ supercritical water for 10 min,the largest contact angle was obtained,up to 145°.Besides,in this sample,the size of carbon spheres was smallest,about 2.09μm diameter on average.When comparing among different types of plastics under the same condition,the contact angle of surface made from PC took the dominant position over that of PS and PE,124°,100°and 90°,respectively.In the sample made from PC,carbon spheres adhered into a mountainlike shape,producing a binary geometric structure.Furthermore,this research could be helpful in the discussion of plastic waste management and carbon spheres fabrication with low cost.
文摘Traditional disposal methods of biomass and plastic waste,such as landfill,combustion,and compost,no longer meet the requirements of carbon reduction,carbon neutrality,and sustain-able society due to low utilization efficiency and severe pollution.As a green,efficient and environmentally-friendly method,hydrothermal technology has been paid much attention to and has already been applied to recycle or reuse various plastic and biomass wastes.No matter for the single or mixed type of waste,it is expected to achieve efficient recycling and obtain value-added products through the hydrothermal process.This review summarized the basic knowledge of hydrothermal technology and the possible reaction mechanism of biomass and plastics un-der hydrothermal conditions and listed the previous reports on the application of hydrothermal technology for converting wastes of biomass,plastic,and biomass/plastic mixtures to solid fuels.Moreover,regarding the future of hydrothermal technology,four points related to reaction mech-anism,synergistic effect,catalysis,and scaled-up application,were provided for consideration.
