Study On Degradation Of Cr(Ⅵ) And Electrochemical Characteristics Of Heteroatom Dotted Carbon Material Derived From Lignin

Green,cost-effective synthesis of high-efficiency heterogeneous catalysts is an important research direction in the field of green chemical engineering.In this paper,heteroatom doping is used,and cheap and easily available lignin is used as the carbon source.A variety of carbon-based catalytic materials dotted with heteroatoms such as nitrogen and phosphorus have been prepared,explored the transfer hydrogenation and electrochemical characteristics of the above catalysts,the main research results are as follows:1.Using urea,dicyandiamide,melamine,g-C3N4 as the nitrogen source,and lignin as the carbon source,the high-temperature pyrolysis method is used to prepare nitrogen-doped carbon catalytic materials with different nitrogen sources and different pyrolysis temperatures.Using SEM,XRD,XPS and BET methods,characterize the structure of the above carbon materials,explore their catalytic activity.The results show that N@C-g-C3N4 nano has the highest in-situ transfer hydrogenation activity,the highly toxic hexavalent chromium can be reduced to non-toxic trivalent chromium within 5 minutes.The degradation efficiency is nearly 100%,the reason is that the high specific surface area(903.0482 m2/g)of N@C-g-C3N4 nano gives it excellent catalytic activity.After 8 months of storage and 6 times of recycling,the catalyst has no loss of catalytic activity and has good stability.2.A lignin-derived carbon material N,P@C co-doped with nitrogen and phosphorus was synthesized,study its electrochemical performance in lithium batteries.Using SEM,FTIR,XRD and Roman methods,and combined with constant current charge and discharge performance test,cyclic voltammetry test and AC impedance test to explore the activity and performance of the catalyst,the results show that N,P@C is used as the negative electrode of lithium battery,under 500 mA/g current,after 500 cycles,the capacity is 1867.4 mAh/g,there is almost no attenuation,with good stability,after 500 cycles of 2 A/g high current,the capacity is 1096 mA/g,it is much higher than that reported in the literature.This is because N,P@C materials have high defect sites and specific surface area.It provides a new method for the application of lignin-based carbon materials in batteries.