Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 545401
Title Effect of pore size distribution and particle size of porous metal oxides on phosphate adsorption capacity and kinetics
Author(s) Suresh Kumar, Prashanth; Korving, Leon; Keesman, Karel J.; Loosdrecht, Mark C.M. van; Witkamp, Geert Jan
Source Chemical Engineering Journal 358 (2019). - ISSN 1385-8947 - p. 160 - 169.
DOI https://doi.org/10.1016/j.cej.2018.09.202
Department(s) Biobased Chemistry and Technology
WIMEK
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Adsorption kinetics - Diffusion - Particle size - Phosphate adsorption - Pore size distribution - Porous metal oxide
Abstract

Phosphate is a vital nutrient but its presence in surface waters even at very low concentrations can lead to eutrophication. Adsorption is often suggested as a step for reducing phosphate down to very low concentrations. Porous metal oxides can be used as granular adsorbents that have a high surface area and hence a high adsorption capacity. But from a practical point of view, these adsorbents also need to have good adsorption kinetics. The surface area of such adsorbents comes from pores of varying pore size and the pore size distribution (PSD) of the adsorbents can affect the phosphate adsorption kinetics. In this study, the PSD of 4 different adsorbents was correlated with their phosphate adsorption kinetics. The adsorbents based on iron and aluminium (hydr)oxide were grinded and the adsorption performance was studied as a function of their particle size. This was done to identify diffusion limitations due to the PSD of the adsorbents. The phosphate adsorption kinetics were similar for small particles of all the adsorbents. For larger particles, the adsorbents having pores larger than 10 nm (FSP and DD6) showed faster adsorption than adsorbents with smaller pores (GEH and CFH). Even though micropores (pores < 2 nm) contributed to a higher portion of the adsorbent surface area, pores bigger than 10 nm were needed to increase the rate of adsorption.

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