摘要
以多环芳烃菲(Phe)、芘(Pyr)和苯并[a]芘(BaP)为目标污染物,研究了土壤pH和腐殖酸对太阳光降解PAHs动力学的影响,以及土壤pH对纳米TiO2和半导体Fe2O3催化太阳光降解PAHs动力学的影响.结果表明,太阳光照射下酸性和碱性土壤中PAHs的降解快于中性,在pH相同的条件下,三种PAHs的降解快慢的顺序为BaP>Pyr>Phe.在PAHs污染土壤中加入腐殖酸后光降解速率加快,5mg·kg-1腐殖酸可有效地促进土壤中PAHs的降解,腐殖酸起到敏化作用.在酸性条件下纳米TiO2和半导体Fe2O3催化降解最快,在碱性和中性条件下相差不大.
This paper studied the soil borne PAHs（polycyclic aromatic hydrocarbons）photodegradation and photocatalytic degradation under solar irradiation with phenanthrene,pyrene and benzo[a]pyrene as target contaminants.The effect of soil pH and humic acids（HA）on the kinetics of photodegradation was studied.The effect of soil pH on the photocatalytic degradation of PAHs was investigated with nano TiO2 or Fe2O3 semi-conducter as catalysts.The results showed that the photodegradation rate of PAHs in acidic or alkaline conditions was greater than that in neutral condition under solar light irradiation.The photodegradation rate of diferent PAHs follows the order of：BaPPyrPhe at the same soil pH.HA accelerated PAHs photodegradation.HA played a sensitizing role during the PAHs photodegradation.HA concentration of 5 mg·kg-1 could efficiently sensitized the PAHs photodegradation.In acidic conditions,the photocatalytic degradation rate of PAHs using nano TiO2 or Fe2O3 semi conducter as catalysts were the greatest,while in neutral and alkaline conditions the difference was not obvious.
出处
《环境化学》
CAS
CSCD
北大核心
2010年第3期486-490,共5页
Environmental Chemistry
基金
国家重点基础研究发展计划(2004CB418506)
关键词
表层土壤
PAHS
太阳光
光催化降解
动力学
soil surface
PAHs
photocatalytic degradation
solar irradiation
dynamics
