Effects of pyrolysis temperatures on the morphological carbon structure,ash,and tetracycline adsorption of corncob biochar
In this study,corncob biochar(CBCs)and deashing biochar(CBCs_AW)were prepared by pyrolysis varing in the range of 300-800℃.The effect of pyrolysis temperature on the ash and carbon structure of biochar was investigated,and the relationship between ash and carbon structure and tetracycline(TC)adsorption was discussed.The results demonstrated that with the increase in pyrolysis temperature,the morphological carbon structure of biochar gradually transformed from uncarbonized organic matter(300℃)to graphitized carbon structure(800℃).The results of adsorption experiments demonstrated that CBC800_AW had the largest adsorption capacity of TC,confirming that the graphitized carbon structure form was an important factor to promote the increase in TC adsorption capacity.The adsorption capacity of TC by CBCs_AW was all higher than that of CBCs,indicating that the ash had a certain inhibitory effect on TC adsorption.The correlation between the adsorption performance of TC and the properties of biochar was analyzed.The results demonstrated that the adsorption capacity was highly correlated with the specific surface area,pore volume,aromaticity,and graphitization degree of biochar,indicating that the main adsorption mechanism of TC was pore filling and π-π electron donor-acceptor interaction(π-π EDA).The results can provide a scientific basis for the utilization of biomass resources and remediation of antibiotic pollution.
万方数据
维普
