Preparation Of Fungus Modified Hierarchical Porous Carbon And Its Adsorption Performance For Toluene

Volatile Organic Compounds?VOCs?severely threaten human health and the ecological environment because most of them are toxic,mutagenic,and carcinogenic.The adsorption technology has been recognized as an efficient and economical control strategy,for it has the potential to recover and reuse both adsorbent and adsorbed substance.However,its low adsorption capacity,poor pertinence,high mass transfer resistance,low adsorption rate and other problems limit it further promotion and application.In view of the deficiency of commonly sued carbon materials in adsorption,it is urgent to seek a kind of specific,efficient and long-term adsorption carbon material suitable for specific types of industrial gas in China.Through the microbial decomposit lignocellulose,the pore structure characteristic of plant biomass raw materials can be effectively adjusted to form hierarchical porous carbon.Consequently,it can improve the adjustable space of pore structure of hierarchical porous carbon and effectively enhance the adsorption characteristics of the material.The lignocellulose of the raw material were degraded with specific microbial strains:lignin was degraded by Phanerochaete chrysosporium,cellulose was degraded by Trichoderma viride,and hemicellulose was degraded by Aspergillus tubingensis.In addition,one/two-step methods were used to prepare hierarchical porous carbon.The main conclusions are as follows:1)The lotus leaves of lignin was degraded by p.chrysosporium.One-step physical activation of water vapor was used and the effects of four factors?the amount of bacteria added,decomposition time,carbonization temperature and activation time?on the physicochemical properties of the material surface and toluene adsorption performance were investigated.It was found that,on the most suitable composition conditions?bacteria amount for 4 mL,lotus leaf decomposition time for seven days,carbonization temperature for 800?and the activation time for 90 min?,the material shows the largest S_BET and toluene adsorption capacity.The difference between one-step physical activation method and two-step chemical activation method were also further compared.The differences of specific surface area,pore volume and toluene adsorption capacity under the two methods were explored.Finally,it was found that KOH:C=1:1 had ideal result2)In order to further explore the preparation technology of hierarchical porous carbon that regulate the proportion of micro/mesoporous.To study the different microbial effects on hierarchical porous carbon,and toluene adsorption capacity.The lignin,cellulose and hemicellulose in biomass were pretreated by Phanerochaete chrysosporium,Trichoderma viride,and Aspergillus tubingensis,respectively.Finally,we found that microbial pretreatment could successfully increase the S_BET,pore volume and toluene adsorption capacity.The surface structure was highly disordered,rough and porous,which were conducive to toluene adsorption.There were some differences in the targeted degradation of the three microbial.These results suggested that lignin was degraded by Phanerochaete chrysosporium resulted in abundant mesopores,cellulose was degraded by Trichoderma viride contributed to micropore generation,and hemicellulose was degraded by Aspergillus tubingensis.The main reasons for toluene adsorption capacity were found to be the ultramicropore and micropore structures in the hierarchical porous carbon.