花生壳生物炭中溶解性碳黑对菲的环境行为研究

Environmental behavior of dissolved black carbon from peanut shell biochar on phenanthrene

生物炭中溶解性碳黑(DBC)具备强迁移性,其理化性质会随着原生质和热解条件的变化而改变。菲具有强生态毒性及致癌特性。以4种DBC(源于花生壳原生质及其200、400、500℃下热解得到的生物炭)为吸附剂,探究了它们的理化性质及对菲的吸附行为和作用机制。结果表明:(1)随着热解温度的升高,花生壳生物炭中DBC的总有机碳(TOC)含量减少。200℃热解得到的生物炭DBC芳香性最强,对菲的吸附能力也最强。(2)随着热解温度的升高,DBC中会形成更多的酚羟基和醚键,而脂肪族碳链、醇或酯会逐渐断裂。

Dissolved carbon black(DBC)in biochar has strong mobility,and its physical and chemical properties will change with the changes of protoplast and pyrolysis conditions.Phenanthrene has strong ecological toxicity and carcinogenicity.Four kinds of DBC(from peanut shell protoplast and biochar obtained by pyrolysis at 200,400 and500℃)were used as adsorbents to investigate their physicochemical properties,adsorption behavior and mechanism of phenanthrene.The results showed:(1)with the increased of pyrolysis temperature,the total organic carbon(TOC)content of DBC in peanut shell biochar decreased.The biochar DBC obtained by pyrolysis at 200℃had the strongest aromaticity and the strongest adsorption capacity for phenanthrene.(2)As the pyrolysis temperature increasesd,more phenolic hydroxyl groups and ether bonds would be formed in DBC,while aliphatic carbon chains,alcohols or esters would gradually break.