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Li W.,South China University of Technology | Wu P.,South China University of Technology | Wu P.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu P.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Regular Higher Education Institutions | And 5 more authors.
RSC Advances | Year: 2015

3D hierarchical honeycomb nano-structured o-MWCNTs coupled with CoMnAl-layer double oxides have been successfully fabricated and characterized as a heterogeneous catalyst for bisphenol A (BPA) degradation using potassium monopersulfate (PMS) as oxidant. The role of MWCNTs was investigated and discussed in terms of surface morphology, structure, composition and catalytic activity of the as-prepared nanohybrid by investigation of SEM, TEM, XRD, XPS, and Raman measurements, etc. The results showed that catalytic performance of the CNTs-LDO can be significantly enhanced with the increase of o-MWCNTs content in the hybrids, and MWCNTs provided orientation/confinement for nanohybrid formation and the defects generated by calcination might increase PMS activation for the production of sulfate radicals. © The Royal Society of Chemistry 2015. Source


Ju F.,South China University of Technology | Ju F.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Hu Y.,South China University of Technology | Hu Y.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Hu Y.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Regular Higher Education Institutions
Separation and Purification Technology | Year: 2011

The efficient removal of EDTA-chelated copper from aqueous solution was achieved using waste iron scraps in interior microelectrolysis. The experimental results show that the appropriate ranges for the cast iron scrap (CIS) dosage and the Fe/C mass ratio are 20-40 g/L and 2:1-4:1, respectively. This method proved effective over a wide range of pH, from 2.0 to 10.0, and copper removal efficiency decreased unevenly as pH increased. Copper removal accelerated as dissolved oxygen (DO) was increased from 0.15 mg/L to 5.25 mg/L, but it decelerated as DO was further increased from 5.25 mg/L to 9.0 mg/L. Additionally, the Taguchi method was used for a L9 (34) orthogonal array design to determine the optimum microelectrolytic conditions for copper removal, and it was found that 98.2% of copper and 32.3% of EDTA (in terms of TOC) were removed under the following optimum microelectrolytic conditions: a pH of 3.0, a CIS dosage of 40 g/L, 40 min of reaction time and a Fe/C mass ratio of 2/1. The results of the Fourier transform infrared (FT-IR) and UV-Visible spectra confirmed the existence of Fe2+-based replacement-precipitation and electrocoagulation during interior microelectrolysis, and these processes contributed to the removal of EDTA-chelated copper from aqueous solution. Economic analysis indicated that interior microelectrolysis was cost-effective and had great potential for practical application in the pretreatment of EDTA-chelated copper in wastewater. © 2011 Elsevier B.V. All rights reserved. Source


Ren Y.,South China University of Technology | Ren Y.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Ren Y.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Regular Higher Education Institutions | Li T.,South China University of Technology | And 3 more authors.
Water, Air, and Soil Pollution | Year: 2013

The competitive adsorption of organic pollutants-phenol, aniline and n-heptane-from biologically treated coking wastewater on powdered activated carbon (PAC) was studied. Firstly, batch adsorption experiments of coking wastewater were conducted to investigate the effect of pH and temperature on their adsorption. Results showed that longchain alkanes, benzoic, halogenated and phenolic compounds were adsorbed well under acidic condition, while amines were adsorbed well under alkaline condition; maximum co-adsorption amount of all kinds of organic compounds occurred at around pH 5. Then, Lagergren kinetic model and pseudosecond-order kinetic model were used to describe the adsorption process of phenol and aniline on PAC. The data were fitted very well with pseudo-second-order kinetics, and the adsorption capacity decreased with an increase in temperature, belonging to Freundlich multi-layer physical adsorption. The adsorption speed and capacity of phenol were superior to aniline in unitary and binary solution. The adsorption amount of n-heptane decreased by 26.6% from ternary competitive absorption system of phenol, aniline and nheptane compared with that in unitary solutions, which showed that phenol and aniline caused spatial adsorption steric hindrance to n-heptane. © 2012 Springer Science+Business Media Dordrecht. Source


Hou Y.,South China University of Technology | Wu P.,South China University of Technology | Wu P.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | Wu P.,Key Laboratory Of Environmental Protect And Eco Remediation Of Guangdong Regular Higher Education Institutions | And 6 more authors.
Journal of Materials Science | Year: 2014

Montmorillonite (MMT) and rectorite (REC) are clay minerals that consist of hydrated aluminum silicate with Si-O tetrahedrons on the bottom of the layer, Al-O(OH)2 octahedrons on the top, and various exchangeable ions such as Na+ and Ca2+ in interlayer. However, the driving force for intercalation of double-stranded DNA is not sufficient to open up the gallery of MMT and REC and allows the intercalation to occur. Furthermore, the external surface of MMT and REC is hydrophilic rather than organophilic. In the study, cationic hexadecyl trimethyl ammonium bromide (CTAB) is chosen to modify MMT and REC to make clay minerals more compatible with DNA. CTAB intercalates into the galleries of clay minerals and expands the basal spacing for DNA intercalation. Novel CTAB-clay/DNA hybrids are synthesized for the first time, with their structure investigated by X-ray diffraction and Fourier transform infrared. Gel electrophoresis analysis confirms that the CTAB-modified clay could protect DNA from degradation of DNase I. UV absorption spectroscopy and circular dichroism indicate that the modified clay minerals can provide a capacity for protecting DNA from damage induced by heavy metals. In addition, the intercalated DNA can be recovered readily under alkaline conditions. Therefore, CTAB-clay/DNA hybrids are potential materials for storage of genetic information. © 2014 Springer Science+Business Media New York. Source


Li T.,South China University of Technology | Li T.,Jiujiang Institute of Environmental science | Ren Y.,South China University of Technology | Ren Y.,Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters | And 4 more authors.
Journal of Applied Polymer Science | Year: 2014

Polyvinyl alcohol(PVA) bead crosslinked with boric acid has been widely utilized as a microorganism immobilization carrier. However, it has some disadvantages such as drastic cell viability loss, small adsorption capacity and mass transfer limitation. To improve upon these drawbacks, a new method to prepare PVA composite pieces with the addition of activated carbon (AC) and poly-3-hydroxybutyrate(PHB) was explored through a combination of freezing/thawing and the boric acid method and by using Tween-80 to improve the mass transfer performance of hydrophobic organics. m-Cresol and pyrene were used as representative compounds with benzene ring structures to model hydrophilic and hydrophobic organics in order to test the performance of PVA pieces. The results showed that, compared with the boric acid method alone, a combination of freezing/thawing and the boric acid method led to a decrease in total organic carbon(TOC) loss from 0.315 g g-1 to 0.033 g g-1 and increased the oxygen uptake rate(OUR) of microorganisms from 0.03 mg L -1·min-1 to 0.22 mg L-1 min -1. The m-cresol equilibrium adsorption amount of the PVA-SA(sodium alginate)-PHB-AC piece was 2.80 times that of the PVA-SA piece. The diffusion coefficient of pyrene in the PVA-SA-PHB-AC piece increased from 0.53×10-9 m2 min-1 to 2.30×10 -9 m2 min-1 with increasing concentrations of Tween-80 from 1000 mg L-1 to 5000 mg L-1. The PVA-SA-PHB-AC composite carrier demonstrated great scope for immobilizing microorganisms for practical wastewater bio-treatment. © 2013 Wiley Periodicals, Inc. Source

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