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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 5, 2016, pp. 1277-1288
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Bioline Code: st16121
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 5, 2016, pp. 1277-1288
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Removal of chromate from wastewater using amine-based surfactant-modified clinoptilolite
Guzel, P.; Aydın, Y. A. & Deveci Aksoy, N.
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.
Keywords
Clinoptilolite; Primary amine surfactant; Chromate; Adsorption
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