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Removal of chromate from wastewater using amine-based-surfactant-modified clinoptilolite

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Abstract

This study presents the results of chromate adsorption upon organically modified clinoptilolite obtained by the treatment of Bigadic clinoptilolite with surfactants in primary amine structure, namely 1-dodecylamine, 1-hexadecylamine and oleylamine. Natural and organo-clinoptilolites were characterized by X-ray diffraction, thermal gravimetry and Fourier transform infrared spectrometry which proved the integration of amine groups followed by the order oleylamine > 1-hexadecylamine > 1-dodecylamine. Organo-clinoptilolites were tested for their efficacy in chromate removal under base case conditions which implied 100 ppm initial concentration, pH 4.0, 10 g l−1 adsorbent dose and at 298 K. Results showed that amine loading induced chromate removal reaching up to 90 % for oleylamine-modified clinoptilolite. Experimentation was continued to determine the effects of pH, adsorbent dosage and initial concentration on chromate adsorption. Accordingly, maximum removal of 94.0 % was attained with 14 g l−1 of oleylamine-modified clinoptilolite, from Cr(VI) solution of 100 ppm initially at pH 3.0. Langmuir isotherm described the adsorption of chromate on oleylamine-modified clinoptilolite with 96.4 % consistency. Maximum theoretical uptake capacity was calculated as 6.72 mg g−1. Kinetic data were consistent with pseudo-second-order model with the controlling steps being film and pore diffusions.

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Acknowledgments

This research was supported by Scientific Research Projects Department of Istanbul Technical University (Grant No. 34969).

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Correspondence to P. Guzel.

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Guzel, P., Aydın, Y.A. & Deveci Aksoy, N. Removal of chromate from wastewater using amine-based-surfactant-modified clinoptilolite. Int. J. Environ. Sci. Technol. 13, 1277–1288 (2016). https://doi.org/10.1007/s13762-016-0954-y

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  • DOI: https://doi.org/10.1007/s13762-016-0954-y

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