Improvement Of Agroforestry Biochar For And Its Applicationin Biofuels And Electrochemical Sensing

Biochar is a solid product obtained by cracking biomass under high temperature anoxic or anaerobic conditions.In today's society facing the dual pressures of energy shortage and environmental pollution,biochar has been widely studied for replacing fossil fuels due to its advantages of green regenerability,high calorific value,low ash content and low pollution.Biochar has structural properties such as large specific surface area and unique pore structure,which makes it widely used in agriculture,climate and other fields,such as water purification,pesticide adsorption,heavy metal adsorption and crop yield increase and so on.The traditional biochar has a relatively large particle size and cannot be directly dispersed in water.Therefore,the preparation of micro-nano biochar is beneficial to the application of biochar materials in electrochemical sensing.In this paper,biochar was prepared from different biomass?cedar,sawdust and bamboo,straw,etc.?to study the role of biochar in fuel.At the same time,micro-nano biochar or activated nano-biochar is obtained by grinding and activating biochar,and is used to construct an electrochemical sensor with other materials to detect VK₃ and heavy metals in animal serum(Pb²⁺,Cd²⁺,Hg²⁺),the following are some of the properties of the newly constructed sensor selectivity and practical applications.The research results as follows:?1?Preparation of cedar-formed biochar fuel,sawdust,bamboo chips composite forming biochar and citron-forming biochar fuel,and experimentally knowing that the formed biochar has the advantages of high density,high calorific value and low ash.Providing theoretical feasibility for turning waste into treasure,improving the environment,and finding new energy sources?2?Straw micro/nano biochar and polystyrene sulfonate?PSS?and poly3,4-ethylenedioxythiophene?PEDOT?,1-ethyl-3-methyl imidazole four fluorine boric acid salt?[EMIm][BF₄]?composite,get a BC-PEDOT:PSS-[EMIm][BF₄]composite material,and build a new electrochemical sensor used to detect animal serum of VK₃.The experiment was in the range of 0.2 to 60?mol/L.A good linear relationship was obtained with a limit of detection?LOD?and a limit of quantitation?LOQ?of 0.06?mol/L and 0.2?mol/L,respectively.The results demonstrate that the constructed electrochemical sensing has certain feasibility in detecting VK₃ in animal serum,which also provides a method for detecting VK₃ in animal serum.?3?Activated nano-biochar was successfully prepared by processing the cedar biochar or citron biochar,and activated cedar to activate nano-biochar,poly3,4-ethylenedioxythiophene?PEDOT?and carboxymethyl Cellulose sodium?CMC?composite and constructed into a new electrochemical sensor for simultaneous detection of heavy metals(Pb²⁺,Cd²⁺,Hg²⁺)at concentrations of Pb²⁺from 0.2 to 20.0?M and Cd²⁺concentrations from 0.6 to 60.0?M,showing a good linear relationship,where for Pb²⁺,the calculated LOD and LOQ are 4.304 nM and 14.35 nM,respectively.For Cd²⁺,the LOD and LOQ were calculated to be 7.741 nM and 25.8 nM,respectively.Experiments have confirmed that BC-PEDOT-CMC composites have good sensitivity and potential practical application in the detection of trace heavy metal ions.