The environmental pressure caused by textile waste is forcing the industry to explore sustainable innovation avenues.This study focuses on the collaborative application of recyclable design and upcycling strategies,ex...The environmental pressure caused by textile waste is forcing the industry to explore sustainable innovation avenues.This study focuses on the collaborative application of recyclable design and upcycling strategies,exploring the construction of acircular economy model centered on material regeneration and creative use.By adopting a unique material composition,modularcomponent design,and simplifying the fiber blending process,the recyclable design strategy significantly improved thedecomposability and recycling efficiency of textiles.The practice of simultaneous upcycling transformed post-consumer andindustrial textile waste into high-value-added products.Experimental data show that the fiber recovery rate increased by 27%,andenergy consumption decreased by 28%compared to traditional processes.Consumer studies show that market acceptance ofcreatively remade products is significantly higher than that of conventional products.The research simultaneously revealedpractical bottlenecks such as material compatibility and economic feasibility,and proposed targeted solutions such as standardizedidentification systems and automated disassembly processes.These findings provide an operational framework for balancingecological benefits and commercial value,and offer practical references for designers,manufacturers,and policymakers to promotethe ecological transformation of the textile industry.展开更多
The decarbonization of the built environment is a pressing issue to achieve CO_(2)reduction targets in the concrete industry.Carbon mineralization of construction and demolition waste(C&DW)is an attractive pathway...The decarbonization of the built environment is a pressing issue to achieve CO_(2)reduction targets in the concrete industry.Carbon mineralization of construction and demolition waste(C&DW)is an attractive pathway to capture of CO_(2)as stable carbonates which can be re-utilized and upcycled in a circularized fashion through the creation of new building blocks.Material recovery from the C&DW is often performed in hydrometallurgical leaching using acidic media;however,this process is often hindered by solubility issues and passivation.To ensure high recoveries of these elements,ligands can be used to enhance dissolution.Carboxylic acids are used in conventional hydrometallurgical mineral processing,such as leaching,floatation,and solvent extraction,and are desired due to their affordability and stability.In this study,we explore the dissolution of waste cement pastes in acidic conditions under the presence of four carboxylic acid ligands:formate,acetate,glutamate,and citrate.The leaching kinetics are categorized and the pseudo-rate constants are established,demonstrating the advantages of these agents to enhance reaction rates in the general order of citrate⋙formate>acetate>glutamate>control.The characterization of the post-extraction reactor residue(PERR)revealed a significant increase in Si-content.Finally,the leachate was carbonated to produce calcium carbonate,which was characterized for its use based on morphology and size.Glutamate demonstrated distinct advantages compared to other ligands,with a dual function of not only improving leachability of cement but promoting and stabilizing vaterite during crystallization.Overall,this study motivates the use of sustainable ligands to enhance material recovery during the dissolution of alkaline wastes for carbon mineralization.展开更多
Solid waste management in Freetown has been further complicated in the wake of rapid population growth and urbanization, resulting in considerable pressure to implement effective and sustainable solutions. This study ...Solid waste management in Freetown has been further complicated in the wake of rapid population growth and urbanization, resulting in considerable pressure to implement effective and sustainable solutions. This study fills the knowledge gap on the recycling infrastructure, solid waste collection processing, sorting and material recovery facilities specific to the Freetown waste management system. The aim of this study is to examine these components in terms of identifying inefficiencies and suggest sustainable practices to eliminate them. The study was guided by a mixed-method approach, which consisted of both quantitative and qualitative methods, and data collection was done through systematic random sampling. The sample of 384 respondents was collected, which includes stakeholders from a range of sectors. The outcome exhibited inefficient waste collection, a lack of formal recycling infrastructure, and suboptimal waste separation at house level, with 65.2% of respondents evidencing not separating their waste and 33% being without access to waste collection services that result in illegal dumping and environmental pollution. The analysis of the solid waste composition shows that a larger share of the waste generated in Freetown is composed of organic material (53% is being organic), which allows for composting programs to be initiated. This research establishes the inevitable requirement for infrastructure upgrading, mounting public awareness, and policy development. By taking into account these sectors, Freetown can become a more environment-friendly waste management system, which would mean a reduction in landfills and much-emphasized resource recovery.展开更多
Recovering valuable materials from waste streams is critical to the transition to a circular economy with reduced environmental damages caused by resource extraction activities.Municipal and industrial wastewaters con...Recovering valuable materials from waste streams is critical to the transition to a circular economy with reduced environmental damages caused by resource extraction activities.Municipal and industrial wastewaters contain a variety of materials,such as nutrients(nitrogen and phosphorus),lithium,and rare earth elements,which can be recovered as value-added products.Owing to their modularity,convenient operation and control,and the non-requirement of chemical dosage,electrochemical technologies offer a great promise for resource recovery in small-scale,decentralized systems.Here,we review three emerging electrochemical technologies for materials recovery applications:electrosorption based on carbonaceous and intercalation electrodes,electrochemical redox processes,and electrochemically induced precipitation.We highlight the mechanisms for achieving selective materials recovery in these processes.We also present an overview of the advantages and limitations of these technologies,as well as the key challenges that need to be overcome for their deployment in real-world systems to achieve cost-effective and sustainable materials recovery.展开更多
In recent years JSC "Krastsvetmet" has successfully developed the production of chemically pure compounds of precious metals.Currently methods have been developed and facilities have been provided for indust...In recent years JSC "Krastsvetmet" has successfully developed the production of chemically pure compounds of precious metals.Currently methods have been developed and facilities have been provided for industrial production of the following platinum metals compounds:Rhodium(Ⅲ) chloride hydrate,rhodium(Ⅲ) chloride solution,rhodium(Ⅲ) nitrate solution,rhodium(Ⅲ) iodide,rhodium(Ⅲ) sulfate,hydrated rhodium(Ⅲ) oxide,ammonium hexachlororodiate,rhodium(Ⅲ) phosphate solution,rhodium electrolytes;Iridium(Ⅳ) chloride hydrate,iridium(Ⅲ) chloride hydrate,ammonium hexachloroiridate(Ⅳ),hexa chloriridium acid solution,hexachloriridium crystalline acid;Ruthenium(Ⅲ) chloride hydrate,ruthenium(Ⅳ) hydroxide chloride,ruthenium(Ⅳ) hydroxide chloride solution,ammonium hexachlororuthenate,ruthenium(Ⅲ) chloride solution,potassium,diaquaoctachloronitrido diruthenate.The quality of the production meets the requirements of Russian and foreign consumers.展开更多
As a kind of material with excellent performance and low cost,plastics have been widely used,and their global annual production reaches 400 million tons,of which approximately 90%derives from non-renewable fossil fuel...As a kind of material with excellent performance and low cost,plastics have been widely used,and their global annual production reaches 400 million tons,of which approximately 90%derives from non-renewable fossil fuels[1].Since plastics are difficult to degrade under natural conditions and their castoff poses a high risk of causing environmental pollution and resource waste[2],constructing efficient material recovery systems to re-integrate end-of-life plastics into the chemical/material industry is a promising strategy for achieving sustainability[3].展开更多
文摘The environmental pressure caused by textile waste is forcing the industry to explore sustainable innovation avenues.This study focuses on the collaborative application of recyclable design and upcycling strategies,exploring the construction of acircular economy model centered on material regeneration and creative use.By adopting a unique material composition,modularcomponent design,and simplifying the fiber blending process,the recyclable design strategy significantly improved thedecomposability and recycling efficiency of textiles.The practice of simultaneous upcycling transformed post-consumer andindustrial textile waste into high-value-added products.Experimental data show that the fiber recovery rate increased by 27%,andenergy consumption decreased by 28%compared to traditional processes.Consumer studies show that market acceptance ofcreatively remade products is significantly higher than that of conventional products.The research simultaneously revealedpractical bottlenecks such as material compatibility and economic feasibility,and proposed targeted solutions such as standardizedidentification systems and automated disassembly processes.These findings provide an operational framework for balancingecological benefits and commercial value,and offer practical references for designers,manufacturers,and policymakers to promotethe ecological transformation of the textile industry.
基金supported by the New York State Energy Research&Development Authority(NYSERDA,Albany,New York)Agreement Number:0000185059the Lenfest Center for Sustainable Energy(Columbia University,New York,New York).
文摘The decarbonization of the built environment is a pressing issue to achieve CO_(2)reduction targets in the concrete industry.Carbon mineralization of construction and demolition waste(C&DW)is an attractive pathway to capture of CO_(2)as stable carbonates which can be re-utilized and upcycled in a circularized fashion through the creation of new building blocks.Material recovery from the C&DW is often performed in hydrometallurgical leaching using acidic media;however,this process is often hindered by solubility issues and passivation.To ensure high recoveries of these elements,ligands can be used to enhance dissolution.Carboxylic acids are used in conventional hydrometallurgical mineral processing,such as leaching,floatation,and solvent extraction,and are desired due to their affordability and stability.In this study,we explore the dissolution of waste cement pastes in acidic conditions under the presence of four carboxylic acid ligands:formate,acetate,glutamate,and citrate.The leaching kinetics are categorized and the pseudo-rate constants are established,demonstrating the advantages of these agents to enhance reaction rates in the general order of citrate⋙formate>acetate>glutamate>control.The characterization of the post-extraction reactor residue(PERR)revealed a significant increase in Si-content.Finally,the leachate was carbonated to produce calcium carbonate,which was characterized for its use based on morphology and size.Glutamate demonstrated distinct advantages compared to other ligands,with a dual function of not only improving leachability of cement but promoting and stabilizing vaterite during crystallization.Overall,this study motivates the use of sustainable ligands to enhance material recovery during the dissolution of alkaline wastes for carbon mineralization.
文摘Solid waste management in Freetown has been further complicated in the wake of rapid population growth and urbanization, resulting in considerable pressure to implement effective and sustainable solutions. This study fills the knowledge gap on the recycling infrastructure, solid waste collection processing, sorting and material recovery facilities specific to the Freetown waste management system. The aim of this study is to examine these components in terms of identifying inefficiencies and suggest sustainable practices to eliminate them. The study was guided by a mixed-method approach, which consisted of both quantitative and qualitative methods, and data collection was done through systematic random sampling. The sample of 384 respondents was collected, which includes stakeholders from a range of sectors. The outcome exhibited inefficient waste collection, a lack of formal recycling infrastructure, and suboptimal waste separation at house level, with 65.2% of respondents evidencing not separating their waste and 33% being without access to waste collection services that result in illegal dumping and environmental pollution. The analysis of the solid waste composition shows that a larger share of the waste generated in Freetown is composed of organic material (53% is being organic), which allows for composting programs to be initiated. This research establishes the inevitable requirement for infrastructure upgrading, mounting public awareness, and policy development. By taking into account these sectors, Freetown can become a more environment-friendly waste management system, which would mean a reduction in landfills and much-emphasized resource recovery.
基金We gratefully acknowledge the support from the startup fundsthe Cross-Disciplinary Research Fund from the George Washington University.
文摘Recovering valuable materials from waste streams is critical to the transition to a circular economy with reduced environmental damages caused by resource extraction activities.Municipal and industrial wastewaters contain a variety of materials,such as nutrients(nitrogen and phosphorus),lithium,and rare earth elements,which can be recovered as value-added products.Owing to their modularity,convenient operation and control,and the non-requirement of chemical dosage,electrochemical technologies offer a great promise for resource recovery in small-scale,decentralized systems.Here,we review three emerging electrochemical technologies for materials recovery applications:electrosorption based on carbonaceous and intercalation electrodes,electrochemical redox processes,and electrochemically induced precipitation.We highlight the mechanisms for achieving selective materials recovery in these processes.We also present an overview of the advantages and limitations of these technologies,as well as the key challenges that need to be overcome for their deployment in real-world systems to achieve cost-effective and sustainable materials recovery.
文摘In recent years JSC "Krastsvetmet" has successfully developed the production of chemically pure compounds of precious metals.Currently methods have been developed and facilities have been provided for industrial production of the following platinum metals compounds:Rhodium(Ⅲ) chloride hydrate,rhodium(Ⅲ) chloride solution,rhodium(Ⅲ) nitrate solution,rhodium(Ⅲ) iodide,rhodium(Ⅲ) sulfate,hydrated rhodium(Ⅲ) oxide,ammonium hexachlororodiate,rhodium(Ⅲ) phosphate solution,rhodium electrolytes;Iridium(Ⅳ) chloride hydrate,iridium(Ⅲ) chloride hydrate,ammonium hexachloroiridate(Ⅳ),hexa chloriridium acid solution,hexachloriridium crystalline acid;Ruthenium(Ⅲ) chloride hydrate,ruthenium(Ⅳ) hydroxide chloride,ruthenium(Ⅳ) hydroxide chloride solution,ammonium hexachlororuthenate,ruthenium(Ⅲ) chloride solution,potassium,diaquaoctachloronitrido diruthenate.The quality of the production meets the requirements of Russian and foreign consumers.
文摘As a kind of material with excellent performance and low cost,plastics have been widely used,and their global annual production reaches 400 million tons,of which approximately 90%derives from non-renewable fossil fuels[1].Since plastics are difficult to degrade under natural conditions and their castoff poses a high risk of causing environmental pollution and resource waste[2],constructing efficient material recovery systems to re-integrate end-of-life plastics into the chemical/material industry is a promising strategy for achieving sustainability[3].
