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Assessment of Adsorptive Filter for Removal of Formaldehyde from Indoor Air

Category: Air Pollution and Health Effects

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.02.0064
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Angus Shiue1, Shih-Cheng Hu1, Chao-Heng Tseng 2, Cheng-Mao Chuang2, Graham Leggett3

  • 1 Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
  • 2 Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei 10608, Taiwan
  • 3 MIRICO Ltd., OX11 0QX, United Kingdom

Abstract

We examine vary face velocity and initial formaldehyde concentration to investigate formaldehyde removal performance of the coconut shell activated carbon (AC) adsorptive filter media. AC surface is smooth and distributed with small pores. The surface of AC is also rather uneven, coarse and porous. Irregular layer structure were formed the amorphous. C, O, Mg, P etc. were detected, which showed the existence of MgO in AC. AC surface area is 1333.3304 m2 g-1, ketone -C=O bonds were successfully grafted on carbon. At any given face velocity, the experimental results present that adsorption capacity is increased and breakthrough time is reduced as initial concentration is increased. The breakthrough behavior of AC adsorptive filter could henceforth be investigated with confidence using the breakthrough curves predicted by the Yoon–Nelson model. Among three kinetic models, the experimental and calculated results show that the correlation coefficient and mean absolute performance error (MAPE) of Pseudo- second-order kinetic model presented the best approximation of the adsorption kinetic process dynamics than Pseudo-First Order Kinetic model and Intraparticle Diffusion model. Both of the Intraparticle diffusion model and membrane diffusion affected the overall rate of AC adsorptive filter media adsorption process by more than one step. The equilibrium data of AC adsorptive filter media was found to best fit to the Langmuir model. The D–R equation predicted the equilibrium capacity of formaldehyde onto AC at relative pressures 0.151.

Keywords

Adsorption Breakthrough Kinetic model Formaldehyde


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