Preparation Of Activated Carbon From Sunflower Disk And Kelp And Its Application In Heavy Metal Adsorption/Lithium Ion Anode Battery Material/electrical Oxidation

China’s biomass resources are abundant,but a large amount of biomass is directly incinerated,discarded,and cannot be well utilized.This not only causes pollution to the environment,but also causes serious waste of resources.Therefore,how to use biomass resources efficiently has become a serious concern of the state and society Problem.In recent years,the conversion of biomass carbonization into activated carbon has unique advantages and has aroused widespread concern in society.This is mainly due to the fact that activated carbon has a developed void structure,larger specific surface area,low reservoir resistance and stable chemical properties during adsorption.Advantage.Therefore,it is widely used in many fields,such as heavy metal adsorption in sewage,battery anode materials,and electrocatalysis.There are two main methods for preparing biomass activated carbon:physical activation and chemical activation.The physical activation method refers to a carbon material which reacts with an oxidizing gas such as carbon dioxide or water vapor at a high temperature to form a porous structure,and the chemical activation method refers to the addition of an activator to a raw material,which is protected by an inert gas.The method of carbonization and activation is accompanied pyrolysis.In this paper,sunflower seed and fresh kelp were used as raw materials to prepare activated carbon samples by chemical activation method.The optimized samples were calculated by characterization and screening of activated carbon samples.The optimized samples were applicable to heavy metal adsorption and electrochemistry.The conclusions are as follows:（1）The effects of activation temperature,activation time,volume ratio of phosphoric acid to water and impregnation ratio on the specific surface area of activated carbon in sunflower dish was studied by using sunflower disk as raw material and H3PO4-KOH as activator.After optimization,the specific surface area of the sample is 2834.58 m²/g,the average pore diameter is 2.99 nm,and the total pore volume is 1.89 cm³/g.The sample is selected to adsorb heavy metals in the wastewater,and the heavy metal content in the filtrate is detected by atomic absorption spectrometry to investigate the adsorption.The influence of time,adsorption temperature and the amount of activated carbon on the adsorption performance.（2）Using sunflower disk as raw material,it is directly activated by phosphoric acid hydrothermal treatment.The BET specific surface area of the material reaches2527.96 m² g^–1,the average pore diameter is 2.83 nm,and the micropore volume is1.64 cm³·g^-1.It was 1.60 cm³·g^-1 and the microporosity was 98.80%.The sample was used as a negative electrode material for lithium ion battery after sulfurizing,and the related electrochemical performance was tested.After circulating for 200 cycles at a current density of 500 mA g^-1,the sample still maintained a high specific capacity of1000 mA hg-1 or more,and the cycle stability was strong.The electrochemical impedance is low..（3）using fresh kelp as raw material,preparing biomass activated carbon by freeze-drying and KOH dry mixing after high temperature activation,at an activation temperature of 800℃,an activation time of 60 min,and a 1:1 mass ratio of kelp powder to KOH.The material has a BET specific surface area of 2071.72 m²·g^-1,an average pore diameter of 2.55 nm,micropore volume of 0.52 cm3·g^-1,a total pore volume of 1.20 cm³·g^-1,and a microporosity of 43.33%.By further doping the cobalt nitrogen at this time its redox performance,the initial potential of the PC-Co-2catalyst material is-0.06 V,the half-wave potential-0.16 V and the limiting current density-3.6 mA cm-2,and good methanol resistance.Sex and stability.