Thermodynamic and kinetic characteristics of Au(III) biosorption onto Aspergillus niger

CORC > 厦门大学 > 化学化工－已发表论文

	Thermodynamic and kinetic characteristics of Au(III) biosorption onto Aspergillus niger
	Zhang, Ji ; Sun, Daohua ; Jing, Xiaolian ; Huang, Jiale ; Zheng, Yanmei ; Li, Qingbiao ; Sun DH(孙道华) ; Huang JL(黄加乐) ; Li QB(李清彪)
刊名	http://dx.doi.org/10.3969/j.issn.0438-1157.2013.04.023
	2013
关键词	Activation energy Adsorption Aspergillus Biosorption Entropy Enzyme kinetics Functional groups Kinetics pH Solutions Thermodynamics
英文摘要	The adsorption behavior of Au(III)onto Aspergillus niger biomass was investigated in aqueous solutions. The effects of pH value, contact time, temperature and initial Au(III)concentration on the adsorption were studied. The results indicated that Au(III)adsorption onto Aspergillus niger was slightly pH-dependent and the pH value of 2.0-3.0 was favorable. The process was obviously accelerated with the increase of temperature in the range of 20-60°C. Au(III)adsorption involved two stages at 20°C, corresponding to the periods before and after Au(III)reduction and achieved equilibrium at a contact time of 24 h, while the adsorption proceeded in one stage at 30, 40 and 60°C and achieved equilibrium at 12, 6, and 1 h, respectively. The adsorption capacity was hardly affected by temperature at lower initial Au(III)concentrations(-1), while a significant increase was observed with the increase of temperature at higher Au(III)concentrations(>367.94 mg·L-1). Au(III)adsorption fits the Langmuir model well, and the maximum Au(III)uptake capacity is 185.19, 202.02, 235.85 and 277.78 mg·g-1 at 20, 30, 40 and 50°C, respectively. The calculated thermodynamic parameters such as Gibbs free energy, enthalpy and entropy changes(ΔG0, ΔH0, ΔS0)reveal that this biosorption is spontaneous and endothermic and entropy increases. The adsorption process conforms to the pseudo-second-order kinetics, with the activation energy of 55.71 kJ·mol-1. Fourier transform infrared spectra illustrate that the functional groups such as amido, carboxyl and hydroxyl may be responsible for the interaction between Au(III) and Aspergillus niger biomass. ? All Rights Reserved.
语种	英语
出版者	Chemical Industry Press
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89142]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Zhang, Ji,Sun, Daohua,Jing, Xiaolian,et al. Thermodynamic and kinetic characteristics of Au(III) biosorption onto Aspergillus niger[J]. http://dx.doi.org/10.3969/j.issn.0438-1157.2013.04.023,2013.
APA	Zhang, Ji.,Sun, Daohua.,Jing, Xiaolian.,Huang, Jiale.,Zheng, Yanmei.,...&李清彪.(2013).Thermodynamic and kinetic characteristics of Au(III) biosorption onto Aspergillus niger.http://dx.doi.org/10.3969/j.issn.0438-1157.2013.04.023.
MLA	Zhang, Ji,et al."Thermodynamic and kinetic characteristics of Au(III) biosorption onto Aspergillus niger".http://dx.doi.org/10.3969/j.issn.0438-1157.2013.04.023 (2013).