TY - JOUR
T1 - Adsorption of dibutyl phthalate on Burkholderia cepacia, minerals, and their mixtures
T2 - Behaviors and mechanisms
AU - Lu, Tingting
AU - Xue, Chao
AU - Shao, Jihai
AU - Gu, Ji Dong
AU - Zeng, Qingru
AU - Luo, Si
N1 - Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - Microorganisms and clay minerals play vital roles in the adsorption of organic chemicals in soils and sediments. In the present study, we conducted batch adsorption experiments, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and relative hydrophobicity tests to investigate the sorption of dibutyl phthalate (DBP) by a DBP-tolerant bacterium (Burkholderia cepacia, Bc), clay minerals (montmorillonite, goethite and kaolinite), and their mixtures. The adsorption isotherms of DBP were best fitted with the Freundlich equation. The order of DBP adsorption capacity was montmorillonite > goethite > Bc > kaolinite, which were 13.83, 12.62, 9.04 and 5.09 mg g-1, respectively. The addition of Bc reduced the adsorption of DBP to montmorillonite and goethite, but increased it on kaolinite. The desorption results showed that the binding strengths of DBP to minerals were also as follows: montmorillonite > goethite > kaolinite. SEM and hydrophobicity tests further confirmed these results, suggesting that the hydrophobic distribution interaction played an important role in the DBP adsorption by the Bc-minerals mixtures, but it might not be the control mechanism for the adsorption of DBP by the individual component. Moreover, FTIR spectra suggested that cell wall proteins, phosphate and CH2 groups involved in DBP adsorption on Bc, and DBP interacted with minerals through H-bonding between C=O groups and adsorbed H2O.
AB - Microorganisms and clay minerals play vital roles in the adsorption of organic chemicals in soils and sediments. In the present study, we conducted batch adsorption experiments, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and relative hydrophobicity tests to investigate the sorption of dibutyl phthalate (DBP) by a DBP-tolerant bacterium (Burkholderia cepacia, Bc), clay minerals (montmorillonite, goethite and kaolinite), and their mixtures. The adsorption isotherms of DBP were best fitted with the Freundlich equation. The order of DBP adsorption capacity was montmorillonite > goethite > Bc > kaolinite, which were 13.83, 12.62, 9.04 and 5.09 mg g-1, respectively. The addition of Bc reduced the adsorption of DBP to montmorillonite and goethite, but increased it on kaolinite. The desorption results showed that the binding strengths of DBP to minerals were also as follows: montmorillonite > goethite > kaolinite. SEM and hydrophobicity tests further confirmed these results, suggesting that the hydrophobic distribution interaction played an important role in the DBP adsorption by the Bc-minerals mixtures, but it might not be the control mechanism for the adsorption of DBP by the individual component. Moreover, FTIR spectra suggested that cell wall proteins, phosphate and CH2 groups involved in DBP adsorption on Bc, and DBP interacted with minerals through H-bonding between C=O groups and adsorbed H2O.
KW - Adsorption
KW - Bacteria
KW - Mineral
KW - Mixtures
KW - Phthalic acid esters
UR - http://www.scopus.com/inward/record.url?scp=84969932798&partnerID=8YFLogxK
U2 - 10.1016/j.ibiod.2016.05.015
DO - 10.1016/j.ibiod.2016.05.015
M3 - 文章
AN - SCOPUS:84969932798
SN - 0964-8305
VL - 114
SP - 1
EP - 7
JO - International Biodeterioration and Biodegradation
JF - International Biodeterioration and Biodegradation
ER -