How Chlorella sorokiniana and its High Tolerance to Pb Might be a Potential Pb Biosorbent
Siyun Liang1, Yuan Kang1, Lixuan Zeng1, Yanyan Qin2, Lu Wang1, Qiuyun Zhang1, Jiwen Luo1
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1School of Chemistry and the Environment, South China Normal University, Higher Education Mega Center,
Guangzhou 510006, People’s Republic of China
2Shenzhen Polytechnic, Shenzhen 518055, People’s Republic of China
Submission date: 2016-09-08
Final revision date: 2016-11-17
Acceptance date: 2016-12-04
Online publication date: 2017-05-26
Publication date: 2017-05-26
Pol. J. Environ. Stud. 2017;26(3):1139-1146
The link between the acute toxicity of heavy metals on algae and the bioadsorption capacity of heavy metals by algae has seldom been reported. In the present study, an acute toxicity experiment was carried out to assess the toxic effects of Pb, Cu, and Cd for Chlorella sorokiniana, and the 96 h IC50 values were 0.249 mg/L, 0.485 mg/L, 46.108 mg/L, and 21.00 mg/L for Cu, Cd, Pb (total), and Pb (free ion), respectively, which implied that Chlorella sorokiniana showed high tolerance to Pb compared to Cu and Cd. Pb distribution analysis indicated that 73.40% to 98.15% of free Pb ions were accumulated on the algae cell wall to avoid further intracellular accumulation, resulting in irreversible metabolic disorders. Then the adsorption capacity of Chlorella was explored. It could be found that the Langmuir model (the R2 were 0.988 and 0.962 for living and lifelss cells, respectively) was fit to explain the adsorption equilibrium data and the qe calculated by this model were 1.54 and 2.97 mg /1010cells for living and lifeless cells, respectively, which was consistent with the experimental result. In the competitive adsorption, Chlorella exhibited a greater affinity for Pb with the higher removal rate compared to Cu and Ni. Therefore, the renewable Chlorella sorokiniana and its dramatic resistance to Pb may serve as a potential biosorbent for Pb in the future.
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