Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST

Mianyang, China

Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST

Mianyang, China
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Dai Q.-W.,China Academy of Engineering Physics | Dai Q.-W.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Dong F.-Q.,China Academy of Engineering Physics | Dong F.-Q.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2012

The biosorption behavior of strontium ions on dead baker's yeast were investigated with the instruments of AAS, EDS. The effect factors on biosorption of baker's yeast to Sr 2+ such as pH values and adsorbent dosage were analyzed. Then the kinetics processes were analysis to Sr 2+ before and after the radiation. The results show that there were all the fast processes to biosorption of Sr 2+ on baker's yeast at different temperature. In the whole kinetics processes, the adsorption quantity (q t) was always being the relation of 30°C>20°C>10°C. The results of baker's yeast to Sr 2+ were all consistent with pseudo-second order adsorption kinetics at different experimental temperatures (as R>0.999) and it shows that the limit rapid step was the chemistry adsorption process. EDS analysis also proved that strontium ions were absorbed on backer's yeast cells. The biosorption effect to Sr 2+ on baker's yeast after radiation was better than the control groups without radiation.


Zhang W.,Southwest University of Science and Technology | Dong F.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Qin Y.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Liu M.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Sun Y.,China Academy of Engineering Physics
Gongneng Cailiao/Journal of Functional Materials | Year: 2015

The adsorption characteristics of U(VI) on inactivated saccharomyces cerevisiae were investigated by conducting a series of batch adsorption experiments in this study. The influence of solution pH, adsorbent dosage, initial U(VI) concentration, contact time were investigated. Scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FT-IR) were used to characterize the surface structure and properties of the inactivated Saccharomyces cerevisiae before and after U(VI) adsorption, and to analyze the adsorption mechanism and adsorption kinetics of U(VI) on inactivated Saccharomyces cerevisiae. The experimental results showed that U(VI) removal rate increased with the increase of adsorbent dosage, and the highest adsorption reached at pH=3.0.The adsorption process fits pseudo-second-order kinetic model and Langmuir isotherm equation, and the maximum adsorption capacity for U(VI) was 45.44 mg/g. The initial concentration of 100 mg/L of U(VI) can be dropped to below 0.040 mg/L after 5-6 times cycle adsorption, and meet the national uranium wastewater discharge standards. Speculation for the behavior of U(VI) adsorption by inactivated Saccharomyces cerevisiae was both physical adsorption and chemical adsorption, exhibiting joint action of electrostatic attraction, redox reaction, chelating ligand and ion exchange. Hydroxyl, amidogen, carboxylic and carbonyl are the main functional groups in the reaction with U(VI). The result suggested that the inactivated saccharomyces cerevisiae may be potential application for wastewater treatment. © 2015, Chongqing Functional Materials Periodical Press Co. Ltd. All right reserved.


Dai Q.-W.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Dai Q.-W.,Key Laboratory of Sichuan Province Auto Control Technology of Environment Engineering | Dong F.-Q.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST | Wu X.-L.,China Academy of Engineering Physics | Li Q.-F.,Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012

One strain bacterium was isolated from purple soil of Sichuan basin. It was subject to Bacillus according to analysis results of 16S rDNA. The effect of its biosorption to Sr2+ under γ-ray radiation was studied in this paper. As for the whole kinetic biosorption curves, the results show that bacterial growth rates of test groups have retardation phenomena compared to the control groups without radiation. Such as the appearance of biosorption equilibrium retarded 1.5 d while the max growth rate retarded 0.5 d after the radiation. SEM analysis showed that the bacterial cells had abnormity distortion after radiation. This proved that γ-ray radiation can bring obvious damage to experimental bacterial cells. FTIR analysis results indicated that bacteria cells were damaged by radiation and Sr2+ has cooperation damage effects with radiation in aqueous condition, and the bacterial cells of log phase are easier to be damaged by coming forth radiation than those of lag phase. This radiation damage under different radiation condition mainly leads to that the characteristic peaks of amylase, protein amide and lipids on bacterial cells are slightly shifted.


PubMed | Key Laboratory of Solid Waste Treatment and the Resource Recycle SWUST
Type: Journal Article | Journal: Guang pu xue yu guang pu fen xi = Guang pu | Year: 2013

One strain bacterium was isolated from purple soil of Sichuan basin. It was subject to Bacillus according to analysis results of 16S rDNA. The effect of its biosorption to Sr2+ under gamma-ray radiation was studied in this paper. As for the whole kinetic biosorption curves, the results show that bacterial growth rates of test groups have retardation phenomena compared to the control groups without radiation. Such as the appearance of biosorption equilibrium retarded 1.5 d while the max growth rate retarded 0.5 d after the radiation SEM analysis showed that the bacterial cells had abnormity distortion after radiation. This proved that gamma-ray radiation can bring obvious damage to experimental bacterial cells. FTIR analysis results indicated that bacteria cells were damaged by radiation and Sr2+ has cooperation damage effects with radiation in aqueous condition, and the bacterial cells of log phase are easier to be damaged by coming forth radiation than those of lag phase. This radiation damage under different radiation condition mainly leads to that the characteristic peaks of amylase, protein amide and lipids on bacterial cells are slightly shifted.

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