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Wu Y.,South China University of Technology | Wu Y.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Luo H.,South China University of Technology | Luo H.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Wang H.,Hunan University
Separation Science and Technology (Philadelphia) | Year: 2014

Different surfactant-modified hydroxo aluminum/graphene nanocomposites were synthesized and used for the adsorptive decolorization of Congo red from aqueous solution. Nanocomposites were prepared by the intercalation of hydroxo aluminum/graphene oxide with three different surfactants, followed by reduction using sodium borohydride. Batch experiments were conducted to evaluate the adsorbance from aqueous solution using different adsorbents under different conditions. The results showed that the maximum adsorption capacity can reach 497.51 mg/g, 398.4 mg/g, and 352.1 mg/g on different adsorbents at pH 3 and 323 K. The as-prepared adsorbents all had good reusability, and the optimal eluent buffer is ethanol, NaOH and HCl for different adsorbents. The adsorption kinetics fitted well with a pseudo-second-order model. Adsorption data were found to fit well with the Freundlich model. The thermodynamic analysis indicated that these adsorptions were endothermic and spontaneous in nature. ©, Taylor & Francis Group, LLC. Source


Shi C.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Zhu N.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 5 more authors.
World Journal of Microbiology and Biotechnology | Year: 2015

The heavy metals content and dewaterability of municipal sewage sludge (MSS) are important parameters affecting its subsequent disposal and land application. Six kinds of inoculums were prepared to examine the characteristics of heavy metals removal and MSS dewaterability improvement in bioleaching processes. The results showed that Cu, Zn and Cd bioleaching efficiencies (12 days) were 81–91, 87–93 and 81–89 %, respectively, which were significantly higher than those of Fe–S control (P < 0.05) and blank control (P < 0.01). The bioleaching boosted by the prepared inoculums could also significantly enhance MSS dewaterability (P < 0.01). The centrifugal dehydration efficiency of MSS rose from 73.00 to 90.00 % at day 12. Microscopic observations and energy dispersive spectrum analysis demonstrated that the dewaterability improvement might be attributed to the changes of sludge structure from flocculent to obvious granular and the formation of secondary minerals mainly consisting of iron, oxygen and sulfur elements. The results above demonstrated that bacterial consortium enriched from acid mine drainage (AMD) was suitable to boost sludge bioleaching for heavy metals removal and dewaterability improvement. It also suggested that the synergy of sulfur/ferrous-oxidizing bacteria (SFOB) enriched from AMD and the cooperation of exogenous and indigenous SFOB significantly promoted bioleaching efficiencies. © 2015, Springer Science+Business Media Dordrecht. Source


Huang J.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Cao Y.,South China University of Technology | And 4 more authors.
Applied Biochemistry and Biotechnology | Year: 2014

An electrogenic bacterium, named Citrobacter freundii Z7, was isolated from the anodic biofilm of microbial fuel cell (MFC) inoculated with aerobic sewage sludge. Cyclic voltammetry (CV) analysis exhibited that the strain Z7 had relatively high electrochemical activity. When the strain Z7 was inoculated into MFC, the maximum power density can reach 204.5 mW/m2 using citrate as electron donor. Series of substrates including glucose, glycerol, lactose, sucrose, and rhammose could be utilized to generate power. CV tests and the addition of anode solution as well as AQDS experiments indicated that the strain Z7 might transfer electrons indirectly via secreted mediators. © 2014, Springer Science+Business Media New York. Source


Yang C.,South China University of Technology | Zhu N.,South China University of Technology | Zhu N.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Zhu N.,The Key Laboratory of Environmental Protection and Eco Remediation of Guangdong Regular Higher Education Institutions | And 5 more authors.
Journal of Material Cycles and Waste Management | Year: 2015

The goal of this study is to determine the potential of Acidithiobacillus ferrooxidans strain Z1 in bioleaching of metal concentrates of waste printed circuit boards (PCBs). The influences of initial pH, initial Fe(II) concentration, metal concentrates dosage, inoculation quantity and particle size on the bioleaching process were investigated and optimum conditions were determined. The results showed that 92.57 % copper leaching efficiency was achieved within 78 h in a two-step process, and 85.24 % aluminum and 95.18 % zinc were leached out after 183 h under the optimum conditions of initial pH 2.25, initial Fe(II) 9 g/L, metal concentrates dosage 12 g/L, inoculation quantity 10 % and particle size 0.178–0.250 mm. It demonstrated that metals could be efficiently leached from metal concentrates by Acidithiobacillus ferrooxidans Z1 and the bioleaching period was reduced 81–78 h. Therefore, the strain Acidithiobacillus ferrooxidans Z1 could be suggested as a potential strain to bioleach metals from metal concentrates of waste PCBs. © 2015 Springer Japan Source


Yang Z.,South China University of Technology | Yang Z.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education | Mo Z.,South China University of Technology | Niu X.,South China University of Technology | Niu X.,The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education
Separation Science and Technology (Philadelphia) | Year: 2015

The calcined layered double hydroxides (CLDHs) with 3:1 Mg/Al molar ratio were observed to acquire a high removal efficiency of perchlorate. And they were applied into perchlorate adsorption process with the initial 100 mg/L perchlorate solution in order to analyze removal efficiencies of perchlorate on various influential factors. The results represented that 1.5 g/L CLDHs could achieve ideal adsorption efficiencies of perchlorate at the pH range of 7–9 and at the temperature of 25°C. The removal efficiencies of perchlorate increased up to a maximum efficiency with the increasing dose of CLDHs. Acidic or highly alkaline environment adversely affected perchlorate adsorption. The adsorption process was found to be endothermic due to the higher adsorption capacity in CLDHs with the increasing temperature. The removal of perchlorate was best represented by the pseudo second-order kinetics model and Langmuir isotherm model. Co-existing anions tests showed that the anions of higher valence had a more significant effect than the monovalent anions during the adsorption process. Finally, the adsorption process was further validated by the X-ray patterns and Fourier-transform Infrared spectra of CLDHs. Results demonstrated potential utility of CLDHs that could be developed into a viable technology for perchlorate removal from water. ©, Taylor & Francis Group, LLC. Source

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