太阳光照射土壤中多环芳烃化合物(PAHs)光催化降解动力学  

KINETICS DYNAMICS OF PHOTOCATALYTIC DEGRADATION OF PAHs ON SOIL SURFACE UNDER SOLAR IRRADIATION

作　　者：张利红[1,2] 陈忠林[1] 徐成斌[1] 李雪梅[3] 李培军[2] 

机构地区：[1]辽宁大学环境学院,沈阳110036 [2]中国科学院沈阳应用生态研究所,沈阳110016 [3]沈阳师范大学化学与生命科学学院,沈阳110034

出　　处：《环境化学》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)

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.

关 键 词：表层土壤 PAHS 太阳光 光催化降解 动力学 

分 类 号：X53[环境科学与工程—环境工程]