摘要
纳米BiOBr(n-BiOBr)是具有广泛应用前景的高活性光催化材料,由于n-BiOBr能在可见光区响应,一旦进入水环境将会造成严重的水生态安全隐患.为探究n-BiOBr对藻类的毒性效应及机理,以羊角月牙藻(Pseudokirchneriella subcapitata)为受试生物,研究n-BiOBr对羊角月牙藻生长状况、光合色素、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)及脂质过氧化物丙二醛(MDA)的影响.结果表明,n-BiOBr对羊角月牙藻的生长有抑制作用,72 h半数效应浓度(EC_(50))为7.407 mg·L^(-1). n-BiOBr处理藻细胞72 h后,藻细胞的叶绿素总量及叶绿素a/b值随着n-BiOBr浓度的升高而降低,呈现一定的浓度-效应关系.随着n-BiOBr浓度增加,MDA、SOD和CAT活性呈现"升高-降低"的趋势.本研究可为纳米材料的科学、有效、无害化应用和管理提供理论依据.
Nano-sized BiOBr（ n-BiOBr） is a highly active photocatalyst with diverse applications. Because of its response to visible light,discharged n-BiOBr can pose potential risk to water ecosystems. In this paper,freshwater green algae（ Pseudokirchneriella subcapitata） was selected as a model organism and the effects of n-BiOBr on growth,photosynthesis pigments,superoxide dismutase（ SOD）,catalase（ CAT）,and malondialdehyde（ MDA）of the algae were investigated. The results showed that the n-BiOBr can strongly inhibit growth of P. subcapitata and 50% effective concentration（ EC（50）） is7.047 mg·L-1 during 72 h exposure period. After 72 h treatment,the total content of chlorophyll a and b and their ratio（ a/b） were both decreased with the increase of n-BiOBr concentrations. At the same time,the activities of SOD and CAT,as well as the content of MDA,showed a＂Bell-shaped curve＂,i.e.,increasing at first and then decreasing. These results are valuable for the risk assessment of nano-sized BiOBr in aquatic environment.
作者
程晓燕
赵新仕
叶立群
马照宇
李玉英
付玲
姚伦广
CHENG Xiaoyan;ZHAO Xinshi;YE Liqun;MA Zhaoyu;LI Yuying;FU Ling;YAO Lunguang(Henan Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province,Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province,College of Agricultural Engineering,Nanyang Normal University,Nanyang 473061)
出处
《环境科学学报》
CAS
CSCD
北大核心
2018年第10期4176-4184,共9页
Acta Scientiae Circumstantiae
基金
河南省教育厅项目(No.16A330004)
南阳师范学院博士专项项目(No.ZX2016003)
河南省科技厅项目(No.182102310609)
河南省科研服务平台专项(No.2016151)
河南省南水北调中线水源区水生态安全创新型科技团队专项资助(No.17454)
国家自然科学基金(No.U1404216
21603109
51502146)~~
关键词
纳米BiOBr
羊角月牙藻
生长抑制
光合色素
氧化压力
nano-sized BiOBr
Pseudokirchneriella subcapitata
growth inhibition
photosynthesis pigments
oxidation stress
