With extensive use of lithium ion batteries （LIBs）, amounts of LIBs were discarded, giving rise to growth of resources demand and environmental risk. In view of wide usage of natural graphite and the high content （...With extensive use of lithium ion batteries （LIBs）, amounts of LIBs were discarded, giving rise to growth of resources demand and environmental risk. In view of wide usage of natural graphite and the high content （12%-21%） of anode graphite in spent LIBs, recycling anode graphite from spent LIBs cannot only alleviate the shortage of natural graphite, but also promote the sustainable development of related industries. After calcined at 600°Cfor 1 h to remove organic substances, anode graphite was used to prepare graphene by oxidation-reduction method. Effect of pH and N2H4·H2O amount on reduction of graphite oxide were probed. Structure of graphite, graphite oxide and graphene were characterized by XRD, Raman and FTIR. Graphite oxide could be completely reduced to graphene at pH 11 and 0.25 mL N2H4·H2O. Due to the presence of some oxygen-containing groups and structure defects in anode graphite, concentrated H2SO4 and KMnO4 consumptions were 40% and around 28.6% less than graphene preparation from natural graphite, respectively.展开更多
Over 1 billion end-of-life tires(ELTs)are generating annually,and 4 billion ELTs are currently abandoned in landfills and stockpiles worldwide,according to the statistics,leading to the environmental and health risks....Over 1 billion end-of-life tires(ELTs)are generating annually,and 4 billion ELTs are currently abandoned in landfills and stockpiles worldwide,according to the statistics,leading to the environmental and health risks.To circumvent these issues,pyrolysis,as an attractive thermochemical process,has been addressed to tackle the ELTs'problem to reduce the risks as well as increase the material recycling.However,due to the lack of systematic characteristic analysis and modification methods,poor quality of CBp limits the improvement of ELTs pyrolysis in industry applications,which plays a crucial role in the economic feasibility of pyrolysis process.In this review,we have summarized the state-of-the-art characteristics and modification methodologies of the upgrading of CBp,to in-depth understand the surface microstructures and physiochemical properties o f CBp for the foundation for modification afterwards.By virtue of the proper selection of modification methods and modifying agents,the new generation of multifunctional carbon materials with desired properties can be instead of the traditional materials of CB,promising broader and various application fields.展开更多
文摘With extensive use of lithium ion batteries （LIBs）, amounts of LIBs were discarded, giving rise to growth of resources demand and environmental risk. In view of wide usage of natural graphite and the high content （12%-21%） of anode graphite in spent LIBs, recycling anode graphite from spent LIBs cannot only alleviate the shortage of natural graphite, but also promote the sustainable development of related industries. After calcined at 600°Cfor 1 h to remove organic substances, anode graphite was used to prepare graphene by oxidation-reduction method. Effect of pH and N2H4·H2O amount on reduction of graphite oxide were probed. Structure of graphite, graphite oxide and graphene were characterized by XRD, Raman and FTIR. Graphite oxide could be completely reduced to graphene at pH 11 and 0.25 mL N2H4·H2O. Due to the presence of some oxygen-containing groups and structure defects in anode graphite, concentrated H2SO4 and KMnO4 consumptions were 40% and around 28.6% less than graphene preparation from natural graphite, respectively.
基金Shanghai Municipal Education Commission-Gaofeng Environment and Ecology Grant Support(No.HJGFXK-2017-002)。
文摘Over 1 billion end-of-life tires(ELTs)are generating annually,and 4 billion ELTs are currently abandoned in landfills and stockpiles worldwide,according to the statistics,leading to the environmental and health risks.To circumvent these issues,pyrolysis,as an attractive thermochemical process,has been addressed to tackle the ELTs'problem to reduce the risks as well as increase the material recycling.However,due to the lack of systematic characteristic analysis and modification methods,poor quality of CBp limits the improvement of ELTs pyrolysis in industry applications,which plays a crucial role in the economic feasibility of pyrolysis process.In this review,we have summarized the state-of-the-art characteristics and modification methodologies of the upgrading of CBp,to in-depth understand the surface microstructures and physiochemical properties o f CBp for the foundation for modification afterwards.By virtue of the proper selection of modification methods and modifying agents,the new generation of multifunctional carbon materials with desired properties can be instead of the traditional materials of CB,promising broader and various application fields.
