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Magnetically modified spent coffee grounds for dyes removal

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Abstract

Large amounts of spent coffee grounds are discharged from food industries, for example, during the instant coffee manufacture. Although part of them is reused as compost and animal feed, most of the coffee grounds are burned as a waste. However, this material can be used as a biosorbent for xenobiotics removal. Spent coffee grounds were magnetically modified by contact with water-based magnetic fluid. This new type of magnetically responsive biocomposite materials can be easily separated by means of commercially available magnetic separators or strong permanent magnets. Magnetic coffee grounds can be used as an inexpensive magnetic adsorbent for the removal of water-soluble dyes. Seven dyes (crystal violet, malachite green, amido black 10B, Congo red, Bismarck brown Y, acridine orange and safranin O) were used to study the adsorption process. The dyes adsorption could be described with the Langmuir isotherm. The maximum adsorption capacities reached the value 73.4 mg of dye per g of dried magnetically modified coffee grounds for acridine orange; it corresponds to 276.6 μmol g−1. This adsorbent can also be used for magnetic solid-phase extraction of crystal violet from extremely diluted solutions. To conclude, magnetic modification of spent coffee grounds resulted in the formation of a new, promising adsorbent for selected xenobiotics removal.

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Acknowledgments

This research was supported by the Ministry of Education of the Czech Republic (project OC 09052—Action COST MP0701) and by the Ministry of Industry and Trade of the Czech Republic (Project No. 2A-1TP1/094). The authors thank Frantisek Weyda (Biological Centre ASCR, Ceske Budejovice) for making the SEM image.

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Authors and Affiliations

  1. Department of Nanobiotechnology, Institute of Nanobiology and Structural Biology of GCRC, Academy of Sciences, Na Sadkach 7, 37005, Ceske Budejovice, Czech Republic

    Ivo Safarik, Katerina Horska, Barbora Svobodova & Mirka Safarikova

  2. Regional Centre of Advanced Technologies and Materials, Palacky University, Slechtitelu 11, 783 71, Olomouc, Czech Republic

    Ivo Safarik

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  1. Ivo Safarik
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  2. Katerina Horska
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  3. Barbora Svobodova
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  4. Mirka Safarikova
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Correspondence to Ivo Safarik.

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Safarik, I., Horska, K., Svobodova, B. et al. Magnetically modified spent coffee grounds for dyes removal. Eur Food Res Technol 234, 345–350 (2012). https://doi.org/10.1007/s00217-011-1641-3

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  • DOI: https://doi.org/10.1007/s00217-011-1641-3

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