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Adsorption and Desorption of Pb2+,Zn2+,Cd2+,Cu2+ and Cr3+by Bacillus mucilaginosus(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2018年01期
Page:
68-
Research Field:
·生命科学·
Publishing date:

Info

Title:
Adsorption and Desorption of Pb2+,Zn2+,Cd2+,Cu2+ and Cr3+by Bacillus mucilaginosus
Author(s):
Zou Chunyan1; 2; Yu Yangge1; Lian Bin1
(1.School of Life Sciences,Nanjing Normal University,Nanjing 210023,China)(2.Guiyang Yunyan District of Ecological Civilization Construction Bureau,Guiyang 550001,China)
Keywords:
Bacillus mucilaginosus; biological adsorption; heavy metals; desorption
PACS:
X753
DOI:
10.3969/j.issn.1001-4616.2018.01.013
Abstract:
The methods for efficient treatment of heavy metal wastewater and recovery of heavy metal ions by adopting the microbial flocculant have received extensive attention of the industry. In this paper,the microbial adsorbents produced by the culture of Bacillus mucilaginosus K02 strain were used to study the characteristics of adsorption and desorption of heavy metal ions like Pb2+,Zn2+,Cd2+,Cu2+ and Cr3+. Atomic adsorption method was used to determine the concentration of heavy metal ions under different treatment conditions. It was found that the adsorption on the single metal ion could reach equilibrium within 2 hours,and the adsorption capacity of the adsorbent could reach 60% in 10 minutes. The results also showed that the adsorption rate of microbial flocculant to the five metal ions increased by the amount of adsorbents’ increasing,and the optimum pH of adsorption was 4～7. The original concentration of ions could affect the adsorption rate greatly. For the adsorption of mixed metal ions,the adsorbent could simultaneously adsorb the five kinds of ions and show a strong selectivity to Pb2+,in which the adsorption rate can reach more than 90%. Oxalic acid,EDTA-2Na ammonium oxalate,and sodium nitrate were used to desorb the adsorbent after adsorption. It was found that oxalic acid had the best desorption effect on Cu2+ and the desorption rate was 42.238%. In addition,ammonium oxalate,EDTA-2Na has a selectivity to Pb2+ that desorption rate can reach more than 64%. The results provides basic data for the microbial adsorbents prepared by the K02 strain in the practical application of heavy metal wastewater treatment.

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Last Update: 2018-03-31