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Adsorption of Low Concentration Formaldehyde in Air Using Ethylene-Diamine-Modified Diatomaceous Earth

Category: Control Techniques and Strategy

Volume: 15 | Issue: 4 | Pages: 1652-1661
DOI: 10.4209/aaqr.2015.05.0292
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Dante P. Bernabe1, Raissa Anne S. Herrera2, Bonifacio T. Doma Jr.2, Ming-Lai Fu3, Yingchao Dong3,4, Ya-Fen Wang 1

  • 1 Department of Environmental Engineering, Chung Yuan Christian University, Chung Li 32023, Taiwan
  • 2 School of Chemical Engineering and Chemistry, Mapúa Institute of Technology, Manila 1002, Philippines
  • 3 Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China
  • 4 Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, , (null), China

Highlights

Diatomaceous Earth as adsorbent for formaldehyde in air.

Ethylene diamene to improve properties of DE adsorbent.

Langmuir and Freundlich isotherms to create calibration curve.

EDA providing adsorption sites improving breakthrough point of the adsorbent.


Abstract

Formaldehyde is one of the most common difficult-to-eliminate indoor air pollutants. Among the available methods of eliminating formaldehyde, adsorption is still the most commonly used due to its simplicity, efficiency, and economic viability. This study investigated the potential of diatomaceous earth (DE) adsorbent for formaldehyde (low concentration in air). DE was considered because of its high silica content and high porosity. It also examined the effect of adding ethylene-diamine (EDA) on the adsorption performance of DE. Amine groups have been proven to improve the adsorption of formaldehyde through their reaction that produces imine. The amount of added EDA was varied from 0.25 to 0.75 g per gram of DE. For pure DE adsorbent, the adsorption performance was 298 mg/g. Adding 0.75 g of EDA resulted in maximum DE adsorption performance (565 mg/g). EDA-modified DE was shown to be a potential adsorbent for removing formaldehyde in air.

Keywords

Calibration curve Breakthrough point Material synthesis Amine Indoor air pollution


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