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Feng C.-H.,South China University of Technology | Li F.-B.,Guangdong Institute of Eco environmental and Soil Sciences | Mai H.-J.,South China University of Technology | Li X.-Z.,Hong Kong Polytechnic University
Environmental Science and Technology | Year: 2010

In this study, we proposed a new concept of utilizing the biological electrons produced from a microbial fuel cell (MFC) to power an E-Fenton process to treat wastewater at neutral pH as a bioelectro-Fenton (Bio-E-Fenton) process. This process can be achieved in a dual-chamber MFC from which electrons were generated via the catalyzation of Shewanella decolorationis S12 in its anaerobic anode chamber and transferred to its aerated cathode chamber equipped with a carbon nanotube (CNT)/γ-FeOOH composite cathode. In the cathode chamber, the Fenton's reagents including hydrogen peroxide (H2O 2) and ferrous irons (Fe2+) were in situ generated. This Bio-E-Fenton process led to the complete decolorization and mineralization of Orange II at pH 7.0 with the apparent first-order rate constants, k app = 0.212 h-1 and kTOC = 0.0827 h -1, respectively, and simultaneously produced a maximum power output of 230 mW m2 (normalized to the cathode surface area). The apparent mineralization current efficiency was calculated to be as high as 89%. The cathode composition was an importantfactor in governing system performance. When the ratio of CNT to γ-FeOOH in the composite cathode was 1:1, the system demonstrated the fastest rate of Orange II degradation, corresponding to the highest amount of H2O2 formed. © 2010 American Chemical Society.

Guangdong Institute of Eco environmental and Soil Sciences | Date: 2012-10-17

A method for recovering lead from lead-containing discarded electronic waste cathode ray tube glass includes the steps of taking a sample of cathode ray tube lead-containing funnel glass, crushing to obtain CRT glass powder, then uniformly mixing zero-valent iron powder with the CRT glass powder according to the mass ratio of 0.1-1.5:1, performing heat preservation at a temperature of 610-960 C. for 3-180 min, and further cooling to extract the metallic lead from a SiO

Yuan Y.,Guangdong Institute of Eco environmental and Soil Sciences | Ahmed J.,Konkuk University | Kim S.,Konkuk University
Journal of Power Sources | Year: 2011

Polyaniline/carbon black (PANI/C) composite-supported iron phthalocyanine (FePc) (PANI/C/FePc) has been investigated as a catalyst for the oxygen reduction reaction (ORR) in an air-cathode microbial fuel cell (MFC). The electrocatalytic activity of the PANI/C/FePc toward the ORR is evaluated using cyclic voltammogram and linear scan voltammogram methods. In comparison with that of carbon-supported FePc electrode, the peak potential of the ORR at the PANI/C/FePc electrode shifts toward positive potential, and the peak current is greatly increased, suggesting the enhanced activity of FePc absorbed onto PANI/C. Additionally, the results of the MFC experiments show that PANI/C/FePc is well suitable to be the cathode material for MFCs. The maximum power density of 630.5 mW m-2 with the PANI/C/FePc cathode is higher than that of 336.6 mW m-2 with the C/FePc cathode, and even higher that that of 575.6 mW m-2 with a Pt cathode. Meanwhile, the power per cost of the PANI/C/FePc cathode is 7.5 times greater than that of the Pt cathode. Thus, the PANI/C/FePc can be a potential alternative to Pt in MFCs. © 2010 Elsevier B.V.

Chen J.,Guangdong Institute of Eco environmental and Soil Sciences | Zhou S.,Guangdong Institute of Eco environmental and Soil Sciences
Biosensors and Bioelectronics | Year: 2016

A label-free DNA Y junction sensing platform for the amplified detection of bisphenol A (BPA) has been constructed by the ingenious combination of toehold-mediated strand displacement and exonuclease III (Exo III)-based signal protection strategy. Three hairpin probes were utilized as the building blocks to fabricate the DNA Y junction with cascaded signal amplification via a series of toehold-mediated strand displacement reactions. Exo III was employed as a protecting agent for the first time to keep the Y-shaped molecular architecture intact, thereby greatly enhancing the fluorescence intensity of DNA intercalator SYBR Green I. The resulting biosensor exhibits ultrasensitivity towards BPA at low concentration (5. fM) without any labeling, modification, immobilization, or washing procedure. Our proposed sensing system also displays remarkable specificity to BPA against other possible interference molecules. Moreover, this DNA junction biosensor is robust and can be applied to the reliable monitoring of spiked BPA in environmental water samples with good recovery and accuracy. With the successful demonstration for BPA detection, the label-free DNA Y junction can be readily expanded to monitor other analytes in a simple, cost-effective, and ultrasensitive way by substituting the target-specific aptamer sequence. © 2015 Elsevier B.V..

Wen J.,Guangdong Institute of Eco environmental and Soil Sciences | Zhou S.,Guangdong Institute of Eco environmental and Soil Sciences | Chen J.,Guangdong Institute of Eco environmental and Soil Sciences
Scientific Reports | Year: 2014

Rapid detection and enumeration of target microorganisms is considered as a powerful tool for monitoring bioremediation process that typically involves cleaning up polluted environments with functional microbes. A novel colorimetric assay is presented based on immunomagnetic capture and bacterial intrinsic peroxidase activity for rapidly detecting Shewanella oneidensis, an important model organism for environmental bioremediation because of its remarkably diverse respiratory abilities. Analyte bacteria captured on the immunomagnetic beads provided a bacterial out-membrane peroxidase-amplified colorimetric readout of the immunorecognition event by oxidizing 3, 39, 5, 59-tetramethylbenzidine (TMB) in the present of hydrogen peroxide. The high-efficiency of immunomagnetic capture and signal amplification of peroxidase activity offers an excellent detection performance with a wide dynamic range between 5.0 x 103 and 5.0 x 106 CFU/mL toward target cells. Furthermore, this method was demonstrated to be feasible in detecting S. oneidensis cells spiked in environmental samples. The proposed colorimetric assay shows promising environmental applications for rapid detection of target microorganisms.

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