Study On The Adsorption Performance Of Sargasso-based Biochar Composite Material For Marine Oil Spill

With the acceleration of industrialization,oil has become one of the most important energy sources in the world.Due to the scarcity of onshore oil resources,many countries have turned their attention to the development of oil resources in the ocean.The rapid development of offshore oil resources and maritime transportation,but there are hidden dangers of leakage in the process of oil extraction and transportation,which are harmful to the ecological environment and human health.The related oil spill pollution treatment technology has also attracted people's attention.Among them,the adsorption material adsorption method and photocatalytic technology have been regarded as key research objects by scholars due to their excellent performance.In this paper,fresh Sargasso algae was used as raw material to prepare modified Sargasso-based biochar(SK700)with high specific area and rich pores by alkali-activated pyrolysis at 700?.Then the ZnO-loaded modified Sargasso-based biochar(SK700)was prepared by solvothermal method.Catalytic ZnO/modified Sargassum-based biochar composite material(ZSK-0.1),which compensates for the defects of photocatalyst agglomeration and high photo-generated electron-hole recombination rate;and through BET,XRD,FT-IR,SEM and other methods The physical and chemical properties of the sample materials were characterized;finally,the adsorption performance of the two materials(SK700,ZSK-0.1)on diesel was discussed separately.The adsorption kinetics and isotherm models were used to analyze the adsorption mechanism of diesel,and the ZSK-0.1 Degradability of diesel under visible light.The conclusions of this paper are as follows:1.Preparation and characterization of modified sargasso-based biochar:The modified sargasso-based biochar was prepared by the high-temperature anaerobic calcination-alkali activation one-step method.After BET data analysis,it can be seen that the 700?alkaline activated biochar(SK700)The specific surface area increased from6.4546 m~2/g to 112.3965 m~2/g;SEM shows that the modified sargassum-based biochar has a rich pore structure;FTIR data analysis shows that it has organic active groups(CN,C=O,-OH).It can be seen that SK700 has a high specific surface area,rich pore structure and a variety of oxygen-containing functional groups,which are beneficial to the adsorption of diesel.2.The adsorption performance of SK700 on diesel oil under different reaction time,pH,temperature,dosage and other conditions was investigated through batch adsorption test.Under the optimal conditions,its adsorption capacity can reach 2.962 g/g,which can be attributed to it.High specific surface area(112.3965 m~2/g).According to the adsorption isotherm model and adsorption kinetics study,the adsorption of oil pollution by SK700 conforms to the L-type adsorption isotherm,and its surface is covered by a single layer of oil film;and the material conforms to the PSO model and belongs to physical-chemical adsorption.3.Preparation and characterization of ZnO/modified sargassum-based biochar composite material:using modified sargassum-based biochar as a carrier material,composite materials with different loadings were prepared by solvothermal method,and compared with preliminary experiments and BET data select the composite material(ZSK-0.1)with a loading amount of 0.1 as the subsequent experimental sample.Its specific surface area is 153.329 m~2/g and the pore volume is 0.1184 cm~3/g.SEM and XRD data analysis show that ZnO/Modified Sargasso-based biochar composite material.4.The adsorption performance of ZSK-0.1 on diesel oil under different reaction time,pH,temperature,dosage and other conditions was investigated through the batch adsorption test.Under the optimal conditions,its adsorption capacity can reach 3.413g/g.Later,its adsorption capacity can reach 3.80 g/g.According to the adsorption isotherm model and adsorption kinetics research,the adsorption of oil pollution by ZSK-0.1conforms to the L-type adsorption isotherm,and its surface is covered by a single layer of oil film;and the material conforms to the PSO model and belongs to physical-chemical adsorption.