Bromocresol Green-Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing InstrumentReport as inadecuate




Bromocresol Green-Mesoporous Silica Adsorbent for Ammonia Gas Sensing via an Optical Sensing Instrument - Download this document for free, or read online. Document in PDF available to download.

1

Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan

2

Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan





*

Author to whom correspondence should be addressed.



Abstract A meso-structured Al-MCM-41 material was impregnated with bromocresol green BG dye and then incorporated into a UV-Vis DRA spectroscopic instrument for the online detection of ammonia gas. The absorption response of the Al-MCM-41-BG ammonia sensing material was very sensitive at the optical absorption wavelength of 630 nm. A high linear correlation was achieved for ppmv and sub-ppmv levels of ammonia gas. The response time for the quantitative detection of ammonia gas concentrations ranging from 0.25 to 2.0 ppmv was only a few minutes. The lower detection limit achieved was 0.185 ppmv. The color change process was fully reversible during tens of cycling tests. These features together make this mesoporous Al-MCM-41 material very promising for optical sensing applications. View Full-Text

Keywords: ammonia gas; optical sensor; mesoporous silica material; UV-Vis absorbance; bromocresol green dye ammonia gas; optical sensor; mesoporous silica material; UV-Vis absorbance; bromocresol green dye





Author: Yu-Chang Chang 1, Hsunling Bai 1,* , Shou-Nan Li 2 and Chun-Nan Kuo 2

Source: http://mdpi.com/



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