This paper focuses on preparation of colloidal solution of graphene-like structures from different ranks of coals: brown coal,bituminous coal,low-volatile bituminous coal,anthracite. It was found that brown coal therm...This paper focuses on preparation of colloidal solution of graphene-like structures from different ranks of coals: brown coal,bituminous coal,low-volatile bituminous coal,anthracite. It was found that brown coal thermo-oxidative destruction leads to formation of small d = 32 nm( V = 17%) and large d = 122 nm( V = 11%) fractions of nanoparticles. The thermo-oxidative destruction of bituminous coal leads to formation of nanoparticles d = 50 nm( V = 5.2%) and d = 164 nm( V = 16%). Thermooxidative destruction of low-volatile bituminous coal and anthracite leads to formation of nanoparticles,predominantly,d = 122-190 nm. Carbon nanostructures obtained from coal are negatively charged at pH= 2-12. Colloidal solution of carbon nanostructures at dispersed phase concentration 0. 01 mg/mL is stable for 1 month. Electron diffraction patterns and X-ray analysis of carbon nanostructures showed that nanostructure from brown coal is amorphous and nanostructure from anthracite is crystalline. Results of coal macromolecules modeling and graphene-like structures obtained from them are presented.展开更多
基金supported by the Ministry of Education and Science of the Russian Federation(the Agreement number 02.a03.21.0008)
文摘This paper focuses on preparation of colloidal solution of graphene-like structures from different ranks of coals: brown coal,bituminous coal,low-volatile bituminous coal,anthracite. It was found that brown coal thermo-oxidative destruction leads to formation of small d = 32 nm( V = 17%) and large d = 122 nm( V = 11%) fractions of nanoparticles. The thermo-oxidative destruction of bituminous coal leads to formation of nanoparticles d = 50 nm( V = 5.2%) and d = 164 nm( V = 16%). Thermooxidative destruction of low-volatile bituminous coal and anthracite leads to formation of nanoparticles,predominantly,d = 122-190 nm. Carbon nanostructures obtained from coal are negatively charged at pH= 2-12. Colloidal solution of carbon nanostructures at dispersed phase concentration 0. 01 mg/mL is stable for 1 month. Electron diffraction patterns and X-ray analysis of carbon nanostructures showed that nanostructure from brown coal is amorphous and nanostructure from anthracite is crystalline. Results of coal macromolecules modeling and graphene-like structures obtained from them are presented.
文摘为了研究自然煤矸石充填复垦地和不同覆土厚度条件下不同颗粒级配煤矸石充填复垦地重构土壤理化性质及在其之上生长的玉米（Zea mays L.）的生理生态特性,以淮南创大“煤矸石充填复垦示范基地”为研究区域,通过分区分层采集实验区范围内土壤样品,检测并分析其主要营养元素及重金属含量,监测实验区内玉米各生理生态指标变化情况及其植株各部分的重金属含量,探究以不同颗粒级配煤矸石作为填充基质对其充填区域农作物的影响.实验结果表明：经过分选后的煤矸石作为填充基质比自然状态下的煤矸石填充基质具有较好的保水保肥性和透气性,尤其以70%-100%粒径为〈80 cm 的煤矸石作为填充基质的重构土壤培育的玉米,其各项生理生态指标均表现良好,说明该复垦方案更有利于玉米的生长.但两种以煤矸石作为主要填充基质的复垦方案都面临土壤中部分重金属含量超标和向植物体迁移的问题.如何降低重构土壤中重金属含量,减少土壤中重金属向植物体内的迁移将成为今后研究的重点.
