Oxidative exfoliation of spent cathode carbon:A two-in-one strategy for its decontamination and high-valued application

Spent cathode carbon(SCC)from aluminum electrolysis is a potential graphite resource.However,full use of the SCC remains a challenge,since it contains many hazardous substances(e.g.,fluoride salts,cyanides),encapsulated within the thick carbon layers and thus posing serious environmental concerns.This work presents a chemical oxidative exfoliation route to achieve the recycling of SCC and the decontaminated SCC with high-valued graphene oxide(GO)-like carbon structures(SCC-GO)is applied as an excellent adsorbent for organic pollutants.Specifically,after the oxidative exfoliation,the embedded hazardous constituents are fully exposed,facilitating their subsequent removal by aqueous leaching.Moreover,benefiting from the enhanced specific surface areas along with abundant O-containing functional groups,the as-produced SCC-GO,shows an adsorption capacity as high as 347 mg·g^(-1)when considering methylene blue as a pollutant model,which exceeds most of the recently reported carbon-based adsorbents.Our study provides a feasible solution for the efficient recycling of hazardous carbonaceous wastes.

基于生物质的高度有序的管状碳材料及其在锂硫电池中的应用（英文）

将棕榈纤维经过炭化和氢氧化钾活化制备高度有序的管状碳材料(OCT),并且将其应用于锂硫电池。所制备的OCT具备高的比表面积和大的孔体积,可以有效地储存硫,合成方法简单且成本较低。同时,所制备的S@OCT复合物呈现出优异的电化学性能。载硫量为65%(w/w)的S@OCT复合材料在0.2C(1C=1 672 mA·g^-1)的倍率下库伦效率接近于100%,其首圈容量高达1 255.2 mAh·g^-1(1.8 mAh·cm^-2),并且100圈后容量保持在756.9 mAh·g^-1(1.09 mAh·cm^-2)。使用5C的大电流测试时,其首圈容量达到了649.1 mAh·g^-1(0.93 mAh·cm^-2),且在100圈后容量保持在504.2 mAh·g^-1(0.72 mAh·cm^-2)。