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Biosorption of a combination of phenanthrene and copper pollutants from aqueous solutions by a Pseudomonas aeruginosa biosorbent
Received:April 26, 2018  Revised:July 03, 2018
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KeyWord:phenanthrene;copper;pollutant combination;adsorption;Pseudomonas aeruginosa biosorbent
Author NameAffiliationE-mail
ZHANG Yan-ping College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China  
ZHANG Dong College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China  
LIU Xing-yuan Guangdong Dazhong Agriculture Science Co. Ltd, Dongguan 523169, China  
ZHAO Hong-ting College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China hzhao@hdu.edu.cn 
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Abstract:
      In this study, the adsorption behavior of coexisting phenanthrene and Cu2+ pollutants by a Pseudomonas aeruginosa biosorbent was investigated. It was found that the coexistence of phenanthrene and Cu2+ could significantly affect their removal by bacteria, suggesting a 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 Cu2+ was 4.70 mg·g-1 (5.50% lower). As the Cu2+ concentration increased from 0 to 5 mg·L-1, the adsorption coefficient for phenanthrene (Kd)increased from 2.54 to 4.73 L·g-1; whereas, as the phenanthrene concentration increased from 0 to 1 mg·L-1, the adsorption coefficient of Cu2+ (KL)increased from 4.89 to 5.06 L·mg-1. In the co-contamination system, the adsorption coefficients of phenanthrene and Cu2+ were found to have negative linear relationships with temperature. Scanning electron microscopy (SEM)analysis showed that the surface morphology of the biosorbent changed only slightly after phenanthrene adsorption, but showed obvious concavity after Cu2+ adsorption. Fourier transform infrared spectroscopy (FTIR)analysis showed that Cu2+ 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.