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Synthesis of biochar/clay mineral nanocomposites using oil shale semi-coke waste for removal of organic pollutants

biochar 2023年第1期5卷 123-143页

作者： Feng Zhao Bin Mu Tenghe Zhang Chunjuan Dong Yongfeng Zhu Li Zong Aiqin Wang Key Laboratory of Clay Mineral Applied Research of Gansu Province Center of Eco-Materials and Green ChemistryLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouPeople’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China.

Due to the poor surface/interfacial interaction and the large gaps in the size and microstructure between biomass and clay mineral,it was difficult to adjust the structure and performance of biochar/clay mineral composites at the molecular ***,oil shale semi-coke composed of multi-minerals and organic matters was used as a promising precursor to prepare biochar/clay mineral nanocomposites via phosphoric acid-assisted hydrothermal treatment followed by KOH activation for removal of organic pollutants from aqueous *** results revealed that the nanocomposites presented well-defined sheet-like morphology,and the carbon species uniformly anchored on the surface of clay *** the changes in the pore structure,surface charge and functional groups after two-step modification,the nanocomposites exhibited much better adsorption property toward organic pollutants than the raw oil shale semi-coke,and the maximum adsorption capacities of methylene blue,methyl violet,tetracycline,and malachite green were 165.30 mg g^(−1),159.02 mg g^(−1),145.89 mg g^(−1),and 2137.36 mg g^(−1),*** adsorption mechanisms involved electrostatic attraction,π-πstacking and hydrogen *** five consecutive adsorption-desorption,there was no obvious decrease in the adsorption capacity of malachite green,exhibiting good cyclic regeneration *** is expected to provide a feasible strategy for the preparation of biochar/clay mineral nanocomposites with the excellent adsorption performances for removal of organic pollutants based on full-component resource utilization of oil shale semi-coke.

关键词： Oil shale semi-coke Clay mineral biochar nanocomposites Adsorption mechanism Solid waste resource utilization

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