Removal of nitrate by synthetic organosilicas and organoclay: Kinetic and isotherm studies

Seliem, Moaaz K.; Komarneni, Sridhar; Byrne, Tim; Cannon, Fred S.; Shahien, Mohamed G.; Khalil, A. A.; El-Gaid, I.M. Abd

doi:10.1016/j.seppur.2013.03.023

Cited by 35 publications

(26 citation statements)

References 25 publications

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“…Hence, as shown in Figure c, the intraparticle diffusion is not the only rate limiting step for all pH studied. Similar results have been also validated by other studies .…”

Section: Resultssupporting

confidence: 92%

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Allalou

Miroud

Belmedani

et al. 2018

Env Prog and Sustain Energy

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New material (AC‐CTABr) was successfully prepared from chemical activation of dates wastes (AC), followed by cationic surfactant modification and was used to enhance nitrate removal from aqueous solutions. Brunauer, Emmett and Teller (BET) analysis revealed good binding of quaternary ammonium groups on the surface (1407 m2/g for the AC and 569 m2/g for the AC‐CTABr). Batch experiments were conducted to examine the effect of contact time, solution pH, adsorbent dose, and initial concentration of nitrate. Preliminary results showed an improvement of nitrate removal from 14% to 60% for the AC and the AC‐CTABr, respectively. Also, the adsorption kinetic was very fast; the equilibrium was achieved within the first 5 min of contact time between the adsorbents and the nitrate solution. Application of several isotherm models has shown that Langmuir and Freundlich models described well the experimental data with a maximum adsorption capacity of 83.33 mg/g. Three simplified kinetic models were tested to investigate the adsorption mechanism. The pseudo‐second order model was found to describe adequately the experimental kinetic data. Results showed that the new adsorbent material is a suitable adsorbent for nitrate removal. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S403–S411, 2019

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“…Hence, as shown in Figure c, the intraparticle diffusion is not the only rate limiting step for all pH studied. Similar results have been also validated by other studies .…”

Section: Resultssupporting

confidence: 92%

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Allalou

Miroud

Belmedani

et al. 2018

Env Prog and Sustain Energy

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“…The larger the intercept, the greater the boundary layer effect [28]. According to this model, if the plot of uptake (qt) versus the square root of time (t 1/2 ) was linear and passes through the origin, then intra-particle diffusion was the only rate-controlling step [22]. The plots of q t versus t 1/2 in Fig.…”

Section: Sorption Kineticsmentioning

confidence: 98%

“…The most common cationic surfactants used for clay modification are quaternary ammonium salts such as cetyltrimethylammonium bromide (CTMAB). Previous studies proved that clay minerals modified with CTMAB had a high affinity toward most hydrophobic organic compounds and had been utilized to remove hydrophobic organic compounds from water [20][21][22]. However, little information on the sorption of TBBPA and its analogue compounds by clay minerals modified with CTMAB has been reported.…”

Section: Introductionmentioning

confidence: 99%

Comparing Sorption Characteristics of Tetrabromobisphenol-A, Bisphenol-A, and 2,6-Dibromophenol in a Single-Aolute Aystem

Li¹,

Peng²,

Zhang³

et al. 2016

Pol. J. Environ. Stud.

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Tetrabromobisphenol-A (TBBPA) and its analogue compounds (bisphenol-A (BPA) and 2, 6-dibromophenol (2, 6-DBP)) sorption on CTMAB-clays was investigated in this paper through bath experiments. Montmorillonite and kaolinite modified by CTAMB, as the adsorbent, were firstly characterized by XRD, FTIR and SEManalysis. The surface areas was determined using N2 (77K) sorption-desorption analysis. Kinetic studies showed that sorption reached equilibrium in 5 hours and followed the pseudosecond order kinetic model. The intra-particle diffusion model for sorption was also investigated and compared to identify the sorption mechanism. The sorption isotherms, well fitted by Freundlich model, were changed from being non-linear to being linear with intercalating CTMAB into clays, which indicated that CTMAB increased the partition interaction. A combination of partition and specific sorption might be contributed to TBBPA and its composition products sorption mechanism. The Freundlich coefficients (kF) and distribution coefficients (kd) for both two adsorbents were primarily increased by increasing amount of adsorbed CTMAB, while the organic carbon normalized sorption coefficients (koc) did not follow this trend. Meanwhile, 100%CEC-CTMAB-Montmorillonite showed an advantage of removal of the selected compounds than 100%CEC-CTAMB-Kaolinite. The sorption capacity of BPA was bigger than that of 2, 6-DBP in spite of their similar hydrophobicity, which indicated some molecule properties might influence the sorption on CTMAB-clays. Moreover, the negative ∆G0 and ∆H0 indicated the spontaneous and exothermal process. The TBBPA sorption on CTMAB-clays was considerably enhanced in the acid condition.

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“…As propriedades superficiais dessa argila podem ser modificadas, atribuindo características mais apropriadas para adsorção de diferentes tipos de espécies químicas a esse material, inclusive certos ânions e compostos orgânicos (SANTOS, 1989). Nesse contexto, diversos estudos têm comprovado a eficácia das argilas montmorilonitas modificadas na adsorção de nitrato (BAGHERIFAM et al, 2014;LI;LI;MENG, 2010;XI;MALLAVARAPU;NAIDU, 2010;BHARDWAJ et al, 2012;SELIEM et al, 2013;MENA-DURAN et al, 2007;BEKELE;FAYE;FERNANDEZ, 2014).…”

Section: Introductionunclassified

Avaliação do uso de argilas montmorilonitas modificadas na adsorção de nitrato em meio aquoso

Duarte

Soares

Carvalho

et al. 2019

Eng. Sanit. Ambient.

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RESUMO Este estudo investigou a eficiência da remoção de nitrato em meio aquoso usando adsorção em argilas montmorilonitas comerciais, comparativamente a uma resina aniônica comumente usada nessa operação. Algumas dessas argilas foram intercaladas como o íon hexadeciltrimetilamônio para avaliação. Áreas superficiais específicas, capacidades de troca catiônica e espectros de infravermelho médio foram obtidos para caracterização das argilas. Testes preliminares indicaram a nanoargila funcionalizada com aminopropiltrietoxisilano e octadecilamina como a mais eficiente na adsorção de nitrato, conquanto não tenha superado em eficiência a resina aniônica comercial também testada. Curvas cinéticas e isotermas de equilíbrio de adsorção de nitrato em fase aquosa na nanoargila e na resina comercial foram determinadas e modeladas para comparação, como também para seleção de modelos representativos e para estimativa de propriedades termodinâmicas dos sistemas estudados. Todos os ensaios foram realizados a 25°C e com pH neutro. Isotermas de equilíbrio também foram determinadas a 35 e 45°C. Os resultados obtidos mostram que o processo adsortivo estudado é físico, espontâneo e favorável tanto para a resina como para a nanoargila, as quais possuem muito boa afinidade com o nitrato. O modelo mais representativo para a cinética foi o de pseudossegunda ordem, enquanto para o equilíbrio foi a isoterma de Freundlich.

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Removal of nitrate by synthetic organosilicas and organoclay: Kinetic and isotherm studies

Cited by 35 publications

References 25 publications

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Performance of surfactant‐modified activated carbon prepared from dates wastes for nitrate removal from aqueous solutions

Comparing Sorption Characteristics of Tetrabromobisphenol-A, Bisphenol-A, and 2,6-Dibromophenol in a Single-Aolute Aystem

Avaliação do uso de argilas montmorilonitas modificadas na adsorção de nitrato em meio aquoso

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