Exopolymeric substances production by Bacillus cereus KMS3-1 enhanced its biosorption efficiency in removing Cd2+and Pb2+ in single and binary metal mixtures

被引:15
作者
Mathivanan, Krishnamurthy [1 ]
Chandirika, Jayaraman Uthaya [2 ]
Srinivasan, Rajendran [3 ]
Charles, Partheeban Emmanuel [4 ]
Rajaram, Rajendran [4 ]
Zhang, Ruiyong [1 ]
机构
[1] Chinese Acad Sci, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China
[2] Manonmaniam Sundaranar Univ, Sri Paramakalyani Ctr Excellence Environm Sci, Environm Nanotechnol Div, Alwarkurichi 627412, Tamil Nadu, India
[3] Alagappa Univ, Sch Marine Sci, Dept Fisheries Sci, Karaikkudi 630003, Tamil Nadu, India
[4] Bharathidasan Univ, Dept Marine Sci, Tiruchirappalli 620024, Tamil Nadu, India
关键词
Bacteria; Growth; EPS production; Biosorption efficiency; Single and binary metal mixtures; Functional groups; HEAVY-METALS; BACTERIA; CADMIUM; LEAD; RESISTANT; EXOPOLYSACCHARIDE; TOXICITY; DETOXIFICATION; URANIUM; CR(VI);
D O I
10.1016/j.envres.2023.115917
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The present study investigated the growth, exopolymeric substance (EPS) production, and biosorption efficiency of strain Bacillus cereus KMS3-1 in the Cd2+ and Pb2+ ions containing single and binary metal-treated broth (50 mg/L). In addition, the interaction of the KMS3-1 strain with Cd2+ and Pb2+ ions in single and binary metal-treated broths was investigated using SEM-EDS, FTIR, and XRD analyses. The results showed that the bio-sorption efficiency (%) and EPS production of KMS3-1 biomass in both single and binary metal-treated broths had increased with increasing incubation time and were higher for Pb2+ ions than for Cd2+ ions. In the single and binary metal-treated broths, the maximum biosorption efficiency of KMS3-1 for Pb2+ ions were 70.8% and 46.3%, respectively, while for Cd2+ ions, they were 29.3% and 16.8%, respectively, after 72 h. Moreover, the biosorption efficiency of strain KMS3-1 for both metal ions was dependent on its EPS production and peaked at the maximum EPS production. The copious EPS production by KMS3-1 was observed in metal-treated media (50 mg/L), in the following order: Pb2+ ions (1925.7 mu g/mL) > binary metal mixtures (1286.8 mu g/mL) > Cd2+ ions (1185.5 mu g/mL), > control (1099 mu g/mL) after 72 h of incubation. This result indicates that the metal biosorption efficiency of the KMS3-1 strain was enhanced by the increased EPS production in the surrounding metal-treated broth. SEM-EDS and FTIR characterization studies revealed that the KMS3-1 biomass effectively adsorbed Cd2+ and Pb2+ ions from the medium by interacting with their surface functional groups (hydroxyl, carbonyl, carboxyl, amide, and phosphate). Moreover, the biosorbed Cd2+ and Pb2+ ions were transformed into CdS and PbS, respectively, by the KMS3-1 biomass. This study suggests that the Bacillus cereus KMS3-1 strain may be a promising candidate for the treatment of metal contamination.
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页数:10
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