Abstract
One framework type of high-silica zeolite only can effectively remove a limited range of organic micropollutants (OMPs) from water. In order to extend the OMP removal range, different types of high-silica zeolites need to be combined in the adsorption process. In this study, Mordernite (MOR) and ZSM-5 (MFI) high-silica zeolite powders were mixed in different mass ratios. The removal performances of eight OMPs by zeolite mixtures, as well as single MOR and MFI zeolites, were evaluated through batch adsorption experiments to investigate their adsorption behaviors and mechanisms. When there was only one solute in water, the adsorption isotherms of OMPs by zeolite mixtures were well predicted by combining the experimental adsorption isotherms of single zeolites based on the mass ratios of single zeolites. In multi-solute water, adsorption isotherms by zeolite mixtures were calculated with less accuracy when solely combining experimental isotherms of single zeolites, especially in the case of having a lower portion of more-effective zeolite in the mixture. This could be attributed to the competition for more-effective zeolite between different OMPs.
Highlights
In recent years, organic micropollutants (OMPs), including phar maceuticals, industrial additives, personal care products, herbicides, and pesticides, have been frequently detected in surface water and ground water [1]
It was assumed that the adsorption of OMPs by zeolite mixtures could be described by the adsorption isotherm and mass ratio of single zeolite
In order to pre-estimate the OMP adsorption capabilities by zeolite mixtures, adsorption isotherms of OMPs on zeolite mixtures were predicted by the experimental adsorption isotherms and mass ratios of single zeolites
Summary
Organic micropollutants (OMPs), including phar maceuticals, industrial additives, personal care products, herbicides, and pesticides, have been frequently detected in surface water and ground water [1]. Several studies implied that OMPs discharged into water bodies will increase the antibiotic resistance of bacteria and will interfere with hormones of aquatic animals, thereby significantly threatening the health of aquatic living organisms and human beings [2,3,4]. Different techniques, such as adsorption [5], oxidation [6] and membrane filtration [7], are investigated as supplementary steps to remove OMPs in water treatment plants. The adsorption efficiency of hy drophilic OMPs by activated carbon is severely affected by background organic matters (BOMs), since BOMs compete with OMPs for adsorption sites and block the pores of activated carbon [12,13]
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