摘要
为研究铜绿假单胞菌(Pseudomonas aeruginosa)吸附剂对菲-铜复合污染的吸附性能,探讨菲、铜复合污染对吸附效果的影响。通过研究复合污染条件下菲、铜吸附系数的变化,复合体系中温度等对菲、铜去除的影响。研究发现复合体系可显著影响细菌吸附剂对菲、铜的吸附性能,吸附剂浓度为0.5 g·L-1,pH=5.0,温度为25℃条件下,吸附剂对菲的吸附量达1.15 mg·g^(-1),较单一体系提高了16.84%;对铜的吸附量为4.70 mg·g^(-1),较单一体系降低了5.50%。随着铜浓度的增加(0～5 mg·L-1),菲的吸附系数Kd从2.54 L·g^(-1)增加到4.73 L·g^(-1);随着菲浓度的增加(0～1 mg·L-1),铜的吸附系数KL从4.89 L·mg^(-1)增加到5.06 L·mg^(-1)。复合体系中,吸附剂对菲和铜的吸附系数均随着温度的增加而减小。扫描电镜(SEM)结果显示,吸附剂吸附菲前后表面样貌没有发生显著变化;而吸附铜离子后,细菌表面呈现明显的凹凸。傅里叶变换红外光谱(FTIR)分析表明,铜离子的吸附与细菌细胞的叁键和累积双键官能团相关,进而影响了细菌吸附剂对复合污染的吸附。
In this study,the adsorption behavior of coexisting phenanthrene and Cu^2+pollutants by a Pseudomonas aeruginosa biosorbent was investigated.It was found that the coexistence of phenanthrene and Cu^2+could significantly affect their removal by bacteria,suggestinga potential synergistic effect.Compared to the single pollutant system,the adsorption capacity of the bacteria(0.5 g·L^-1,pH=5.0,and 25℃)for phenanthrene was found to be 1.15 mg·g^-1(16.84% higher),whereas the adsorption capacity for Cu^2+was 4.70 mg·g^-1(5.50%lower).As the Cu^2+concentration increased from 0 to 5 mg·L^-1,the adsorption coefficient for phenanthrene(Kd)increased from 2.54 to4.73 L·g^-1;whereas,as the phenanthrene concentration increased from 0 to 1 mg·L^-1,the adsorption coefficient of Cu^2+(KL)increased from4.89 to 5.06 L·mg^-1.In the co-contamination system,the adsorption coefficients of phenanthrene and Cu^2+were found to have negative lin?ear relationships with temperature.Scanning electron microscopy(SEM)analysis showed that the surface morphology of the biosorbentchanged only slightly after phenanthrene adsorption,but showed obvious concavity after Cu^2+adsorption.Fourier transform infrared spec?troscopy(FTIR)analysis showed that Cu^2+adsorption was related to the triple bonds and the accumulated double bond functional groups of bacterial cells,thereby influencing the adsorption in the co-contamination system.
作者
张艳平
张栋
刘兴元
赵红挺
ZHANG Yan-ping;ZHANG Dong;LIU Xing-yuan;ZHAO Hong-ting(College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;Guangdong Dazhong Ag.riculture Science Co.Ltd,Dongguan 523169,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2019年第2期422-429,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41271249
21407037)
浙江省自然科学基金项目(LQ14B070006)
广东省东莞市引进创新科研团队项目(2014607101003)~~
关键词
菲
铜
复合污染
吸附
铜绿假单胞菌吸附剂
phenanthrene
copper
pollutant combination
adsorption
Pseudomonas aeruginosa biosorbent
