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Dong Y.,University of Science and Technology Beijing | Dong Y.,Key Laboratory of the Ministry of Education of China | Lin H.,University of Science and Technology Beijing | Lin H.,Key Laboratory of the Ministry of Education of China | And 4 more authors.
International Biodeterioration and Biodegradation | Year: 2013

The bioleaching, biosorption and passivation of five different types of copper sulfide minerals (djurleite, bornite, covellite, pyritic chalcopyrite, and porphyry chalcopyrite) by Acidithiobacillus ferrooxidans (At.f LD-1) were investigated in this paper. The bioleaching experiments showed that copper extraction followed the order djurleite>bornite>pyritic chalcopyrite>covellite>porphyry chalcopyrite. The bacterial adsorption experiments indicated that the bacterial adsorption quantity onto the five copper sulfide minerals had the same order as that of copper extraction. SEM analysis showed that bacterial distribution on the djurleite, bornite, and covellite was uniform and that on the pyritic chalcopyrite and porphyry chalcopyrite was uneven (distributed as continuous chain structure). Zeta potential analysis showed that the zeta potentials of copper sulfide minerals after interaction with At.f LD-1 cells changed to varying degrees. The variation degree of the zeta potentials of the five copper sulfide minerals showed the same order as the bacterial adsorption quantity on the five copper sulfide minerals. The main passivation layers on the residues of djurleite and bornite were both jarosite, and that the passivation layers on the residues of covellite, pyritic chalcopyrite, and porphyry chalcopyrite were Cu4S11, S8, andCu4Fe2S9, respectively. The inhibition ability of passivation layers followed the order Cu4Fe2S9>Cu4S11>S8>jarosite. © 2013 Elsevier Ltd. Source


Huo H.,University of Science and Technology Beijing | Huo H.,Key Laboratory of the Ministry of Education of China | Lin H.,University of Science and Technology Beijing | Lin H.,Key Laboratory of the Ministry of Education of China | And 8 more authors.
Journal of Hazardous Materials | Year: 2012

This paper presents the investigation of the ammonia-nitrogen and phosphates sorption from simulated reclaimed wastewater by modified clinoptilolite. The results showed that the modified clinoptilolite has a high sorption efficiency and removal performance. The ammonia-nitrogen and phosphates removal rate of the modified clinoptilolite reached to 98.46% and 99.80%, respectively. The surface of modified clinoptilolite became loose and some pores appeared, which enlarged the specific surface area; the contents of Na and Fe increased, and the contents of Ca and Mg decreased. The modified clinoptilolite possesses rapid sorption and slow balance characteristics and ammonia-nitrogen and phosphates sorption is more consistent with the Langmuir isotherm model. The adsorption kinetics of ammonia-nitrogen and phosphates follows the Elovich adsorption dynamics equation, which describes the sorption of ammonia-nitrogen and phosphates in aqueous solution as mainly a chemical sorption. Results from the thermodynamics experiment involving ammonia-nitrogen and phosphates sorption reveal that the process is a spontaneous and endothermic process, and is mainly driven by entropy effect. © 2012 Elsevier B.V. Source

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