海洋表层沉积物及其非水解有机质级分对菲和壬基酚的吸附  

Sorption of phenanthrene and nonylphenol by marine surface sediments and nonhydrolyzable organic carbon fractions

作　　者：徐德成 张代男 胡淑捷 熊永强[1] 杨余[1] 冉勇[1] XU Decheng;ZHANG Dainan;HU Shujie;XIONG Yongqiang;YANG Yu;RAN Yong(Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]中国科学院大学,北京100049

出　　处：《环境科学学报》2018年第9期3652-3661,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金-广东省自然科学基金联合项目(No.U1701244)~~

摘　　要：选择5个南海表层沉积物及其非水解有机质(NHC)级分作为研究对象,应用元素分析、二氧化碳和氮气吸附技术及X射线光电子光谱(XPS)表征,同时研究了其对菲和壬基酚的吸附行为.沉积有机质的有机碳含量与吸附能力之间存在显著的正相关关系,表明沉积有机质在吸附疏水性有机污染物(HOCs)过程中的重要作用.同时,沉积有机质的吸附能力和微孔体积之间也存在显著的正相关,表明微孔填充机理在菲和壬基酚的吸附中扮演着重要角色.此外,NHC级分的表面羧酸碳含量与其对菲和壬基酚的吸附能力之间存在显著的正相关,表明沉积有机质与π供体之间存在较强的π-π电子供受体作用.本研究综合考虑了沉积有机质和HOCs间的多种作用机理(疏水作用、微孔填充和π-π电子供受体作用),有助于进一步理解沉积有机质与有机污染物之间的吸附机制,对于水环境的治理与修复具有重要意义.Five marine surface sediments and nonhydrolyzable organic carbon（ NHC） fractions were characterized by elemental analysis,CO2 and N2 adsorption techniques,X-ray photoelectron spectroscopy（ XPS） and used as geosorbents for phenanthrene（ Phen） and nonylphenol（ NP）. The organic carbon contents are positively and significantly correlated to sorption capacity of Phen and NP by bulk sediments and NHC fractions,indicating sediment organic matter（ SOM） plays an important role in the sorption of HOCs. Meanwhile,significant correlations between sorption capacity of hydrophobic organic compounds（ HOCs） by SOM and SOM micropore volumes（ V0） suggest that nanopore-filling mechanism dominates Phen and NP sorption. In addition,a strong linear correlation is demonstrated between surface carboxyl contents and the sorption capacity of Phen and NP for NHC fractions,suggesting that there are strong π-π interactions between π-donor and SOM. This study considers the multiple interaction mechanisms（ e. g.,hydrophobicity partitioning,π-π electron donor-acceptor（ EDA） interactions） of SOM and HOCs for further understanding the sorption mechanisms in sorption process,which is beneficial to the water environmental governance and restoration.

关 键 词：沉积物 非水解有机质 菲 壬基酚 吸附 

分 类 号：X703[环境科学与工程—环境工程]