Effect of Anode Electrode Modified with Carbon Nanomaterials of Microbial Fuel Cell-based Sensor on Detection Sensitivity of Water Toxicity / 分析化学

The low sensitivity of microbial fuel cell ( MFC)-biosensor is one of the bottlenecks in its practical application. To investigate the effect of anode electrode modified with carbon nanomaterials on the sensitivity of water toxicity detection of MFC-based biosensor, graphite felts ( GF ) were modified using two carbon nanomaterials of multi-walled carbon nanotubes ( MWNT ) and conductive carbon black ( GCB ) . MFC biosensors were started up with the anode electrodes, and the results showed that resistance of the GCB and MWNT-modified electrode was smaller than that of unmodified electrode, and the order of MFC power output was GCB/GF-MFC (2. 63 W/m2)>MWNT/GF-MFC (2. 56 W/m2)>GF-MFC (2. 09 W/m2). Then, 3, 5-dichlorophenol poison ( DCP) was used as a model toxicant in toxicity test, the order of toxicity inhibition ratios of 10 mg/L DCP to three MFC biosensor was MWNT/GF-MFC (31. 8% )>GCB/GF-MFC (26. 3% )>GF-MFC (20. 1% ). The sensitivity for toxicity detection by MFC biosensors with anode electrode modified with carbon nanomaterials was improved, and MWNT/GF-MFC had the highest sensitivity. The result of the study may promote the application of MFC biosensor in water pollution monitoring.

Development of a new biosensor for biochemical oxygen demand / 中华预防医学杂志

<p><b>OBJECTIVE</b>To use a new kind of fixing material, i.e. Sol-Gel organic-inorganic hybridized material to immobilize bacterium to detect Biochemical oxygen demand quickly.</p><p><b>METHODS</b>The biosensor was fabricated using a thin film in which Hansenula anomala was immobilized by sol-gel and an oxygen electrode. The optimum measurement for biochemical oxygen demand was at pH 7.0; 28 degrees C; response time 3 - 12 min. Pure organic compound, sewage and rate of recovery were detected with the biosensor.</p><p><b>RESULTS</b>It shows that the BOD biosensor can be used to detect many organic compounds such as amino acid, glucide. It is suitable to monitor sewage and industrial waste water which has low level alcohols and phenols. The microbial membrane can work 3 months and remain its 70% activity. It is measured that the rate of recovery of BOD is between 90% to 105% in sewage.</p><p><b>CONCLUSION</b>The study confirmed the effectiveness and usefulness of BOD sensor, which is quick, convenient, low cost and reliable with little interference.</p>