This research aimed to expand the activity of TiO2 down to the visible light region by modifying the sol-gel conditions and doping with tungsten. The optimum conditions for calcination temperature, acid type, and heating rate were 200°C, HNO3, and 1°C/min, respectively. The undoped TiO2 synthesized under these conditions could significantly absorb the visible light whereas the commercial Degussa P-25 could not. The absorptivity decreased sequentially as the wavelength increased from 400 to 700 nm. Within 6 h of 2-W blue-light illumination, 23% of 0.1 mM 2-chlorophenol was removed. The XRD result showed that the crystalline was anatase phase. The visible-light absorption property of the TiO2 became even better when doped with tungsten. At the optimum W to TiO2 ratio of 0.5%, the degradation of 0.1 mM 2-chlorophenol increased to 53% indicating a higher photocatalytic activity. Both crystalline and amorphous TiO2 could exhibit the photocatalytic activity under the visible light region.
LED Lighting and Compatibility Issues with Legacy Dimming Systems
LED Lighting and Compatibility Issues with Legacy Dimming Systems LED technology is being adopted by numerous businesses around the world. Its energy saving benefits, long lifespan and modern features have won over individuals who are looking for reliable lighting solutions. But in order for the transition to gain full acceptance by consumers and commercial sectors, LEDs have to be able to support legacy dimming systems and controls. LED Dimming Definition and Standards Dimming is a crucial aspect of...
Types of UV Light for Different Applications
Types of UV Light for Different Applications Ultraviolet (UV) radiation was discovered in 1801 when the German physicist Johann Wilhelm Ritter observed that invisible rays just beyond the violet end of the visible spectrum darkened silver chloride-soaked paper more quickly than violet light itself. He called them "oxidizing rays" to emphasize chemical reactivity and to distinguish them from "heat rays", discovered the previous year at the other end of the visible spectrum. In 1878 the effect of short-wavelength...
The Importance of Explosion Proof Lights in Cleanrooms
Cleanrooms are pushing the limits of industrial manufacturing and scientific research programs. For professionals, the rooms provide a predictable environment with low levels of stray pollutants, germs, dust and chemical vapors. Activities conducted in cleanrooms are carried out with greater precision and safety. Class 1 Division 1 Explosion Proof Lights Explosion proof lights are typically installed in cleanrooms to prevent sparks from igniting flammable or combustible elements in the hazardous location....
Increase greenhouse efficiency with boom lighting
As a leader in greenhouse automation equipment, we are always looking to bring our growers new ideas on how to best utilize our equipment within their greenhouse. With the release of our highly coveted Universal Attachment, we are able to bring you new ideas on how to do more with less. The Universal Attachment is highly effective for attaching fans, insect mats, fans and lights. Boom lighting has been a common practice in greenhouse operations to promote or inhibit flowering and is the topic of today’s...
OSHA and MSHA Requirements for String Lights
Industrial string lights are used to support temporary lighting systems. Such luminaries are commonly found in mining operations, warehouses and construction sites. The Occupational Safety and Health Administration (OSHA) and the Mine Safety and Health Administration (MSHA) governs the application of temporary string lights to ensure safety for operators and nearby workers in the site. The need to oversee temporary lighting practices in hazardous work locations has increased in the past decade. According a...