Application Of Fungus Engineering On Ultrahigh Surface Area Activated Carbon:Insight Into Tailor-Made Structure Regularity And Its Mechanism

Recently,China’s air quality has improved significantly,and the control of air pollution has been to a new stage:coordinated control of PM_2.5and O₃.In China,O₃and PM_2.5pollution are still mainly controlled by Volatile Organic Compounds（VOCs）.Adsorption is one of the most common and economical methods for removing VOCs,particularly using porous carbon materials as adsorbents.However,the practical applicability of porous carbon is limited for its low adsorption capacity,poor pertinence,and large mass transfer resistance.To overcome the shortcomings of carbon material adsorbents,it is urgent to find a special,efficient,long-acting carbon material suitable for the removal of specific VOCs.In this work,cellulose,hemicellulose,lignin,and biomass are cultured in fungus solution using a two-step method to prepare hierarchical porous carbon applied in VOCs adsorption.The pore structure forming mechanism and regulation are further studied to synthesis porous carbon with high specificity for different VOCs removal.The main conclusions are as follows:1)Rice husks were pretreated by cellulose-targeted fungi（Trichoderma viride）.Porous carbon with an ultrahigh specific surface area(S_BET)of 3714 m².g^-1and a hierarchical porous structure are synthesized.This work achieves one of the highest S_BETof biomass carbons among recent studies.The carbonaceous materials with microbial pretreatment exhibit better toluene adsorption performances(100 ppm:708 mg.g^-1),adsorption rates,and cyclic utilization than those without pretreatment(100 pm:538 mg.g^-1).Moreover,the diffusion coefficient verifies that the mesopores accelerate the kinetic process of toluene adsorption,and it was also found that the pretreatment of fungi increased the selectivity of toluene/nitrogen adsorption.2)The results show that:T.viride has almost no effect on lignin,while significantly influences the structural characteristics of hemicellulose and cellulose（crystallinity,molecular weight,and surface functional group structure,etc.）,which accelerate the forming or micropores;Besides,the mechanism of mesoporosity produced by the synergistic effect of and KOH etching was also evaluated,and the results show that more oxygen-containing groups are formed on the surface of biomass after treated.That might cause concentrate activation which results in mesoporous forming.3)To achieve the purpose of precise pore size adjustment,the previous discipline has been confirmed widely suitable for different biomass.The number of pores from 0.6-1.2nm（T.viride modified materials at different modification times）was fitted,and the results show that Gauss fitting can well explain the regulation of the amount of 0.6-1.2nm pores,and all R²coefficients are as high as 0.77-0.98.Moreover,the number of pore increases from 0-0.6nm pore size migration stage has a clear linear relationship with the number of pore decreases from 0.6-1.2nm.Therefore,through the modification time of T.viride,we reached the precise regulation of the pores at the range of 0-1.2nm.Notably,the porous carbon with designed pores from sugarcane is successfully used for pertinence contaminant adsorption based on grand canonical Monte Carlo.