Development of a field enhanced photocatalytic device for biocide of coliform bacteria  

作　　者：Jeff M.Huber Krista L.Carlson Otakuye Conroy-Ben Mano Misra Swomitra K.Mohanty 

机构地区：[1]Departments of Civil Engineering,University of Utah [2]Departments of Metallurgical Engineering,University of Utah [3]Departments of Chemical Engineering,University of Utah

出　　处：《Journal of Environmental Sciences》2016年第6期38-44,共7页环境科学学报（英文版）

基　　金：financial support from the Utah Science Technology and Research (USTAR) initiative;the State of Utah Governor's Office for Economic Development's (GOED) Technology Commercialization & Innovation Program (TCIP);the Technology & Venture Commercialization (TVC) at the University of Utah

摘　　要：A field enhanced flow reactor using bias assisted photocatalysis was developed for bacterial disinfection in lab-synthesized and natural waters. The reactor provided complete inactivation of contaminated waters with flow rates of 50 mL/min. The device consisted of titanium dioxide nanotube arrays, with an externally applied bias of up to 6 V. Light intensity, applied voltage, background electrolytes and bacteria concentration were all found to impact the device performance. Complete inactivation of Escherichia coli W3110（- 8 × 10^3CFU/mL） occurred in 15 sec in the reactor irradiated at 25 mW/cm^2 with an applied voltage of 4 V in a 100 ppm NaCl solution. Real world testing was conducted using source water from Emigration Creek in Salt Lake City, Utah. Disinfection of natural creek water proved more challenging, providing complete bacterial inactivation after 25 sec at 6 V. A reduction in bactericidal efficacy was attributed to the presence of inorganic and organic species, as well as the increase in robustness of natural bacteria.A field enhanced flow reactor using bias assisted photocatalysis was developed for bacterial disinfection in lab-synthesized and natural waters. The reactor provided complete inactivation of contaminated waters with flow rates of 50 mL/min. The device consisted of titanium dioxide nanotube arrays, with an externally applied bias of up to 6 V. Light intensity, applied voltage, background electrolytes and bacteria concentration were all found to impact the device performance. Complete inactivation of Escherichia coli W3110（- 8 × 10^3CFU/mL） occurred in 15 sec in the reactor irradiated at 25 mW/cm^2 with an applied voltage of 4 V in a 100 ppm NaCl solution. Real world testing was conducted using source water from Emigration Creek in Salt Lake City, Utah. Disinfection of natural creek water proved more challenging, providing complete bacterial inactivation after 25 sec at 6 V. A reduction in bactericidal efficacy was attributed to the presence of inorganic and organic species, as well as the increase in robustness of natural bacteria.

关 键 词：Titanium dioxide Nanotubes Immobilized Photocatalysis Escherichia coli Inactivation 

分 类 号：R378[医药卫生—病原生物学]