Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST

China

Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST

China

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Zhu P.,Shanghai University | Zhu P.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Cao Z.B.,Shanghai University | Qian G.R.,Shanghai University | And 4 more authors.
Canadian Metallurgical Quarterly | Year: 2014

Leaching behaviours of metallic powders were investigated using electrically generated chlorine at the anode chamber containing sulphuric acid solution, NaCl and CuSO4. Various parameters, which included the solid/liquid ratio, current density, concentration of NaCl, CuSO4, and H2SO4, leaching temperature, particle size, and stirring speed, were studied to understand the mechanism of leaching metallic powders. The capability of dissolved metallic powders increased with the increase in all parameters except the solid/liquid ratio. Leaching metallic powders were transport-controlled with a low activation energy of 14·7 kJ mol -1. The dissolved copper could be transferred from the anodic chamber to the middle chamber by solvent extraction technology. In the electric field, copper ions are transferred from the middle chamber to the cathodic chamber through a cation exchange membrane (CEM) and electrodeposited to form copper foils. The tensile strength and elongation percentage of 65 μm-thick copper foils were 276 Mpa and 10·66%, respectively. The utilisation of metallic powders recovered from waste PCBs (WPCBs) could produce high-performance copper foil. © 2014 Canadian Institute of Mining, Metallurgy and Petroleum.


Dai Q.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Zhang W.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Dong F.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Yulian Z.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Wu X.,Sichuan Science Cobalt Source Co.
Chemical Engineering Journal | Year: 2014

Radionuclide remediation is becoming an increasingly serious environmental problem, posing threat to biotic life. Biosorption is a technology for the treatment of wastewater containing metal ions. In this work, the biosorption of strontium ions (Sr2+) to baker's yeast and the effect of γ-ray radiation on the biosorption process were investigated at different experimental conditions. The experimental results fitted well to the Langmuir and Freundlich model isotherms before and after the γ-ray radiation (r2>0.985), and the maximum biosorption capacity values were qmax>33.0mgg-1 at 30°C. Negative values of δG0 and positive values of δH0 were observed indicating, the spontaneous and endothermic nature of Sr2+ biosorption on baker's yeast, respectively. The biosorption kinetics followed a pseudo-second-order equation at different experimental temperatures (r2>0.999), the calculate results of the strontium sorption capacity at equilibrium (qe,cal) increased about 0.4-1.0mgg-1 after γ-ray irradiated. The activation energy of baker's yeast biosorption to Sr2+ decreased 0.79kJmol-1 after γ-ray radiation. The γ-ray radiation affects the amide bands of proteins and leads to a decrease of the isoelectric point from pH of 2.55 to 2.25 and an increase in the electronegativity of the cells wall. In summary, an appropriate γ-ray radiation condition not only has no negative effects, but also can enhance its biosorption capacity slightly of Sr2+ to baker's yeast. © 2014 Elsevier B.V.


Dai Q.-W.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Dong F.-Q.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Zhang W.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Noonan M.J.,Lincoln University at Christchurch
Proceedings - International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2011 | Year: 2011

The kinetics of biosorption and desorption to lead ions on dried and wet wasted beer yeast were investigated with the instruments of AAS and SEM. In order to enhance the experimental results reliability and practice application value, the sorption solution system was gone on "L"-degree dosage level in the whole experimental process. The results showed that the biosorption and desorption process were fast to Pb2+ on dried and wet beer yeast. There were very good biosorption or desorption effect in the first 30 min, and in this time, the desorption efficiency was 91.70% and 82.93% to dried and wet beer yeast, respectively. In the first biosorption process, wet beer yeast had better biosorption effect than dried beer yeast. In addition, desorbent of 0.1 mol/L HNO3 was considered that it couldn't use as the best desorption condition. The other desorption conditions were need research or the beer wasted beer yeast is only used for single-time biosorbent. © 2011 IEEE.


Ma L.,Southwest University of Science and Technology | Dong F.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Bian L.,China Academy of Engineering Physics
2010 4th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2010 | Year: 2010

Rare earth (RE) (La3+, Ce4+, Pr3+, Nd 3+, Sm3+, Eu3+, Gd3+, Tb 3+, Dy3+, Er3+, Tm3+ and Y 3+) doped rutile phase TiO2 were prepared by low temperature one step synthesis and used as photocatalyst. The RE doped rutile phase TiO2 were characterized by X-ray diffraction (XRD), Particle Size, zeta potential, UV-visible spectroscopy, fluorescence spectrum. The results show that the RE have been doped into the rutile TiO2 crystal lattice successfully. It was analyzed that main crystal phase was rutile phase TiO2 in XRD. It shows that we can get micrometer-size rutile phase TiO2 and RE doped TiO2 by one-step method. Particle Size indicate that we can get micrometer-size rutile TiO2 and RE doped rutile TiO2 by one-step method. The results of zeta potential of RE doped rutile TiO2 explain RE how to change the photoelectric activity by increase the lattice defect. The results of FS show that RE how to influence on the electron transition and the electron trap of rutile TiO2. These results indicate that RE can enhanced photocatalytic degradation of rutile TiO2. © 2010 IEEE.


Zhang B.-L.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Feng Q.-M.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Gao D.-Z.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Wang W.-Q.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2011

Using quartz powder and white mud of paper mill as raw material, large aspect ratio of acicular wollastionite was synthesized by high temperature solid-state reaction method. The influence of mass ratio of quartz powder and white mud of paper mill, synthesis temperature and holding time on phase composition, relative content of the product were studied, and the morphology and particle diameter of wollastionite which was synthesized under optimum conditions were characterized. The results showed that the relative content and crystallinity of wollastionite were high, the largest aspect ratio reached to 30 when mass ratio of quartz powder and white mud of paper mill was 0.66:1, calcining temperature was 1120°C, and the holding time was 4 h. This research opens up a new way of effective utilization of white mud of paper mill.


Wei Z.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Wei Z.,Southwest University of Science and Technology | Faqin D.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Qunwei D.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Qunwei D.,Southwest University of Science and Technology
2010 4th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2010 | Year: 2010

The biosorption of strontium ions on beer yeast was investigated under the different adsorption conditions. The results of this study showed that the beer yeast has some abilities to adsorb Sr(II) from solution. Different variables, such as solution pH, contact time, adsorbent dose and initial strontium ions concentration influenced the adsorptive quantity. The process of biosorption has nearly reached equilibrium within 30 min and the optimum pH is near 4.5. Increasing the initial concentration of Sr(II) and biosorbent dosage results in higher adsorptive quantity. The SEM analysis showed that the interactions were between Sr(II) ions and functional groups on the cell wall surface of waste beer yeast. Consequently, waste beer yeast is an inexpensive, readily available adsorbent for strontium ions. © 2010 IEEE.


Yang L.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST | Dai Q.,Key Laboratory of Solid Waste Treatment and Resource Recycle SWUST
Proceedings - International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2011 | Year: 2011

The paper is aim to discuss the dye wastewater treatment by sewage sludge-based adsorbent. The adsorbent derived from sewage sludge, which produced through phosphoric acid-microwave method, and commercia activated carbon (ACC) were tested in the process of the Reactive Light Yellow dye wastewater treatment. The effects of pH value, contact time and the adsorbents' amount on the adsorption efficiency were studied on the basis of the removal rate of CODCr, and the adsorption isotherm of the sewage sludgebased activated carbon (ACSS) was discussed. The results indicated that the sewage sludge-based activated carbon was mesoporous with a surface area of 168 m 2/g and an average pore diameter of 8.8nm. The optimum pH of ACSS was 10, the adsorption equilibrium time of ACSS was 40 min. When the dosage of ACSS was 5g/L, the removal rate of CODCr was 92.3%, that's means the ACSS had a good adsorption performance. The Freundlich model and Langmuir model were all fit for the Reactive Light Yellow dye wastewater adsorption. © 2011 IEEE.

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