An enrichment method to detect low concentration formaldehyde

2008 ◽  
Vol 134 (2) ◽  
pp. 1010-1015 ◽  
Author(s):  
Jing Wang ◽  
Li Liu ◽  
Song-Ying Cong ◽  
Jin-Qing Qi ◽  
Bao-Kun Xu
Keyword(s):  
Enrichment Method ◽  
Low Concentration ◽  
Low Concentration Formaldehyde

The removal of low concentration formaldehyde over sewage sludge char treated using various methods

2011 ◽  
Vol 28 (7) ◽  
pp. 1556-1560 ◽  
Author(s):  
Ji Young Lee ◽  
Sung Hoon Park ◽  
Jong-Ki Jeon ◽  
Kyung-Seun Yoo ◽  
Seung-Soo Kim ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Low Concentration ◽  
Sewage Sludge Char ◽  
Low Concentration Formaldehyde

Conjugated microporous poly(aniline)s for removal of low-concentration formaldehyde

2021 ◽  
pp. 117119
Author(s):  
Jinwei Zhu ◽  
Xiaoyu Lou ◽  
Yubing Wang ◽  
Zhuo Xiong ◽  
Jie Chen ◽  
...  
Keyword(s):  
Low Concentration ◽  
Low Concentration Formaldehyde ◽  
Poly Aniline

Fabrication and Formaldehyde-Sensing Property of Quartz Crystal Microbalance (QCM) Coated with PVP-MWCNTs Composites

2015 ◽  
Vol 645-646 ◽  
pp. 719-723 ◽  
Author(s):  
Ying Fei He ◽  
Ya Dong Jiang ◽  
Hui Ling Tai ◽  
Guang Zhong Xie
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Absorption Spectrometry ◽  
Fast Response ◽  
Formaldehyde Concentration ◽  
Multiwalled Carbon ◽  
Low Concentration ◽  
Spray Process ◽  
Formaldehyde Sensing ◽  
Low Concentration Formaldehyde

In this paper, the quartz crystal microbalance (QCM) sensors coated with polyvinyl pyrrolidone (PVP)-multiwalled carbon nanotubes (MCWNTs) nanocomposite thin films were developed by the spray process, which were used for the detection of low concentration formaldehyde at room temperature. The surface morphology and structure of films was analyzed by scanning electron microscope (SEM), UV-Vis absorption spectrometry, respectively, and the formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited the linear characteristic, fast response, good reproducibility to low concentration formaldehyde within 6 ppm, and the poisoning of films was observed when the formaldehyde concentration exceeded 6ppm. Moreover, the sensitivity of the sensor could achieve up to 1Hz/ppm and had the good stability of response values.

Chemical Modifications of Peptides and Proteins with Low Concentration Formaldehyde Studied by Mass Spectrometry

2016 ◽  
Vol 44 (8) ◽  
pp. 1193-1199 ◽  
Author(s):  
Zi-Jian WANG ◽  
Jing-Bo YANG ◽  
Guang-Pu Li ◽  
Ning-Ning SUN ◽  
Wan-Chun SUN ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Chemical Modifications ◽  
Low Concentration ◽  
Low Concentration Formaldehyde

A New Safety Enrichment Method for Low Concentration Coal Bed Methane-Proportion Pressure Swing Adsorption

2011 ◽  
Vol 233-235 ◽  
pp. 2276-2280 ◽  
Author(s):  
Yong Ling Li ◽  
Ying Shu Liu ◽  
Xiong Yang
Keyword(s):  
Pressure Swing Adsorption ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Carbon Molecular Sieve ◽  
Enrichment Method ◽  
Adsorption Characteristic ◽  
Low Concentration ◽  
Explosion Limit ◽  
Pressure Swing ◽  
Enrichment Process

Based on pressure swing adsorption, Proportion Pressure Swing Adsorption (PPSA), a new enrichment method with high safety, was suggested to enrich the low concentration coal bed gas. A mixture of active carbon (CA) and carbon molecular sieve (CMS) was employed as adsorbent in the process of PPSA. The methane and oxygen in coal bed gas were adsorbed simultaneously. The experimental study was carried out in order to verify the feasibility of this method. The equilibrium adsorption characteristic of CA and CMS were tested. The results showed that both concentrations of CH4 and O2 in desorption gas could be controlled well and would not exceed the explosion limit in enrichment process by adjusting the mass ratio of CMS5/AC1. Therefore, the new method, PPSA, can guarantee the safety in enrichment of coal bed methane.

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