The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite

Vujaković, Aleksandra D.; Tomašević-Čanović, Magdalena; Daković, Aleksandra; Dondur, V.

doi:10.1016/s0169-1317(00)00019-3

Cited by 56 publications

(27 citation statements)

References 10 publications

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“…While the CEC value of Bigadic clinoptilolite was comparably lower than the values reported by Rozic et al (2009) and Vujakovic et al (2000) as 1.35 and 1.42 meq g -1 , the ECEC value was quite similar, i.e., 0.12 and 0.19 meq g -1 , respectively. The crystal size, aggregate size and aggregate porosity are determinative for the ECEC of a clinoptilolite sample rather than the CEC (Rozic et al 2009).…”

Section: Characterization Of Natural Clinoptilolitecontrasting

confidence: 60%

“…H ? -clinoptilolite was further modified with surfactant by a procedure proposed by Vujakovic et al (2000). Accordingly, the solid suspension of H ?…”

Section: Preparation Of Surfactant-modified Clinoptilolitementioning

confidence: 99%

“…However, the negative charge can be tuned by surface modification with either strong acids or with long-chain organic cations such as surfactants. Such surface treatments not only enhance the potential for anion exchange, but also modify the charge, composition, texture and structure, significantly (Vujakovic et al 2000(Vujakovic et al , 2003Wang and Peng 2010). Surfactant-modified zeolites (SMZs) have been suggested for remediation of wastewaters polluted with several organic pollutants, such as phenolic compounds (Lin and Juang 2009), dyes (Xie et al 2013) and heavy metal ions (Wang and Peng 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The advancement in uptake capacity ranged between threefold and 20-fold depending on the compositional and textural properties of the raw material and more importantly, on the extent of surfactant loading (Leyva-Ramos et al 2008;Zeng et al 2010;Bajda and Klapyta 2013). An alternative modification route involving primary amine surfactants was proposed by Vujakovic et al (2000Vujakovic et al ( , 2003Vujakovic et al ( , 2004) who pretreated zeolites with strong acidic or basic agents to form a stable surface coverage and to obtain strong sites for anion precipitation. Since the surface precipitation is dominant mechanism for Cr(VI) adsorption, modification of strong acid-treated clinoptilolites with primary aminebased surfactants is an appropriate method to prepare high-performance Cr(VI) adsorbent (Vujakovic et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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

Guzel

Aydin

Aksoy

2016

Int. J. Environ. Sci. Technol.

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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 oleylamineOrgano-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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Section: Characterization Of Natural Clinoptilolitecontrasting

confidence: 60%

“…H ? -clinoptilolite was further modified with surfactant by a procedure proposed by Vujakovic et al (2000). Accordingly, the solid suspension of H ?…”

Section: Preparation Of Surfactant-modified Clinoptilolitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Guzel

Aydin

Aksoy

2016

Int. J. Environ. Sci. Technol.

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show abstract

“…Many authors show the use of modified natural zeolite on environmental applications, mainly anions uptake from effluents by adsorption processes 10,11,20,21 . The present work describes studies of characterization, modification (treatment) and application of a natural zeolite from Chile.…”

Section: Introductionmentioning

confidence: 99%