Characterization of the biosorption properties of dormant spores of Aspergillus niger: a potential breakthrough agent for removing Cu2+ from contaminated water. Issue 23 (2nd March 2017)

• Record Type: Journal Article
• Authors: Wang, Jing-Yao; Cui, Chong-Wei
• Is Part Of: RSC advances. Volume 7:Issue 23(2017)
• Page Start: 14069
• Page End: 14077
• Publication Date: 2017-03-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra28694a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The biosorption capacity of Aspergillus niger spores for Cu 2+ was found to be 25.3 mg g −1, which was two times higher than that of its mycelium (10.1 mg g −1 ). Abstract : Recent work has focused on a new cultivation method (solid fermentation), by which a new form of Aspergillus niger was produced; the spores were characterised by a 2 μm diameter and higher biosorption capacity than that of Aspergillus niger mycelium, which was prepared using the traditional method (submerged fermentation). The results showed that the maximum biosorption capacity for Cu 2+ of the Aspergillus niger spore was 25.3 mg g −1 and that of the Aspergillus niger mycelium was only 10.1 mg g −1 at a natural pH with an initial concentration of 30 mg L −1 . Meanwhile, the mechanism of the spores involved ion exchange (P, K, Ca and Mg), complexation (C–O, CO, C–N and C–H) and electrostatic attraction, and Cu–O was formed during the process. Moreover, the spores exhibited a short biosorption equilibrium time of 60 min over a pH range of 4.0–6.0, and the data fitted well with the pseudo-second-order kinetic equation and the Freundlich isotherm. A thermodynamic study demonstrated that the process was spontaneous and endothermic. In addition, the amplification of Aspergillus niger spores on an agricultural waste medium was from 10 6 to 10 9 .