The removal of reactive dyes from aqueous solutions using chemically modified mesoporous silica in the presence of anionic surfactant—The temperature dependence and a thermodynamic multivariate analysis

Cestari, Antonio R.; Vieira, Eunice F.S.; Vieira, Gláucia S.; Costa, Luiz Pereira da; Tavares, Andréa M.G.; Loh, Watson; Airoldi, Cláudio

doi:10.1016/j.jhazmat.2008.03.091

Cited by 73 publications

(44 citation statements)

References 30 publications

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“…a variety of surface functionalized mesoporous silicas have been used for adsorbing varies dyes (Table 2). For example, the adsorption of cationic dye by chitosan-functionalized MPS is 0.012 mmol/g and that of anionic dye by amino-functionalized MPS 0.6-1.96 mmol/g (Cestari et al 2007;Zu-bieta et al 2008;Cestari et al 2009). MPSs functionalized with carboxylic and amino groups have been fabricated for capturing basic and acidic dyes, respectively, are very efficient (good selectivity, large capacity and extremely rapid adsorption rate) because of the designed strong electrostatic interactions and their high surface areas (Ho et al 2003;Anbia and Salehi 2012;Santos et al 2013).…”

Section: Dye Adsorption By Mesoporous Silicasmentioning

confidence: 99%

Review of the use of mesoporous silicas for removing dye from textile wastewater

Salahshoor

Shahbazi

2014

European Journal of Environmental Sciences

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The textile industry is a major user of dyes and hence an important source of water pollution, which poses a threat to aquatic as well as human life. Adsorption is a widely used technique for separating and removing dye from wastewater. Recently the use of mesoporous silica (MPSs) as an adsorbent in wastewater treatment has received considerable attention. MPSs are emerging as potential adsorbents because of their surface area, tunable and uniform pore structure, high pore volume, ordered pore structure, thermal and mechanical stability, and extraordinarily wide possibilities for functionalization to increase their adsorption capacity. In this paper the ability of MPSs to absorb dyes from aqueous solutions is reviewed. This article provides information on adsorption studies carried out under different operational conditions such as contact time, solution pH, temperature, agitation speed, etc. This review also summarizes and attempts to compare the equilibrium isotherm and kinetic models, and the thermodynamic studies that report the adsorption of dyes onto MPSs. The literature reviewed, indicate that SBA-MPSs have a higher adsorption capacity than MCM-MPSs and functionalized MPSs a better adsorption capacity than MPSs. It is evident from the literature that the potential of MPS based nano-sorbents being used for removing dyes from aqueous solution is very high. However, still more research work is needed on developing cost effective and more efficient MPS based nano-sorbents for use commercially.

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Section: Dye Adsorption By Mesoporous Silicasmentioning

confidence: 99%

Review of the use of mesoporous silicas for removing dye from textile wastewater

Salahshoor

Shahbazi

2014

European Journal of Environmental Sciences

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“…Due to the presence of inert materials in commercial samples of this dye, the purity of such dyes, supplied from the Dystar Dyes Company, was ca. 55% as reported by Cestari et al (2009). All chemical reagents employed (NaOH, HCl, KCl, C 6 H 4 COO.COOH, Na 2 B 4 O 7 •10H 2 O) were of A.R.…”

Section: Methodsmentioning

confidence: 99%

Removal of the Textile Dye Indanthrene Olive Green from Aqueous Solution Using Chitosan

Chaves

Santana

Schultz

et al. 2009

Adsorption Science & Technology

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ABSTRACT:The kinetics and equilibrium of the adsorption of Indanthrene Olive Green (IOG) from aqueous solution onto chitosan have been investigated. The chitosan was characterised in terms of its average degree of de-acetylation (DD) and by XRD, TGA/DTG, IR, SEM and specific BET surface area methods. Batch adsorptions experiments were carried out at different pH values and dye concentrations. It was found that the adsorption process was favoured by acidic pH conditions (4.0-6.0). The adsorption followed second-order rate kinetics and the experimental equilibrium data followed the Langmuir isotherm, thereby suggesting that chemisorption might be the major adsorption mode. Such adsorption also occurred on chitosan fibres, although to a significantly lower extent than on crushed chitosan. The corresponding thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0 ) were calculated. The positive values obtained for ∆H 0 (161.7 kJ/mol) and ∆S 0 [559.9 J/(mol K)] suggest that the adsorption process was endothermic, with the randomness of the system increasing during the adsorption process. A simplified adsorption model has also been proposed.

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“…The obtained adsorption capacities of the synthesized thiol-silica composites were compared to previously reported works on adsorption capacities of Pb(II) ions by different thiol functionalized mesoporous silicas synthesized by co-condensation at various MPTMS to TEOS ratios ( Table 4 20 H) was used in Hoang et al [15] and Thu et al [18]. …”

Section: Synthesis and Characterization Of Thiol-silica Compositesmentioning

confidence: 99%

“…The adsorption mechanism for the removal of the heavy metal ions in an aqueous solution is either by electrostatic interaction or by chelation [17,20]. However, for an efficient mass transfer of the adsorbate, pore sizes must be large enough.…”

Section: Introductionmentioning

confidence: 99%

Removal of lead(II) ions from aqueous solutions using cashew nut shell liquid-templated thiol-silica materials

Mdoe¹,

Makene²

2014

Bull. Chem. Soc. Eth.

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ABSTRACT. A range of thiol-silica composites were prepared using cashew nut shell liquid (CNSL) or one of its phenolic constituents, cardanol, as templates. The procedure involved formation of a CNSL or cardanol emulsion in a water-ethanol system into which (3-mercaptopropyl)-trimethoxysilane and tetraethyl orthosilicate were simultaneously added at various ratios. The reaction mixture was aged at room temperature for 18 h followed by a Soxhlet extraction of the template and drying. The materials were characterized by diffuse reflectance Fourier transform infrared, nitrogen physisorption, scanning electron microscopy and acid titration. Results indicated that indeed the thiol-silica composites were successfully prepared, with thiol group loadings ranging from 1.6-2.5 mmol/g. The materials were tested for lead(II) adsorption, and results showed that they had maximum adsorption capacities up to 66.7 mg/g, depending on the thiol group loading and type of template used in preparing the adsorbent.

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The removal of reactive dyes from aqueous solutions using chemically modified mesoporous silica in the presence of anionic surfactant—The temperature dependence and a thermodynamic multivariate analysis

Cited by 73 publications

References 30 publications

Review of the use of mesoporous silicas for removing dye from textile wastewater

Review of the use of mesoporous silicas for removing dye from textile wastewater

Removal of the Textile Dye Indanthrene Olive Green from Aqueous Solution Using Chitosan

Removal of lead(II) ions from aqueous solutions using cashew nut shell liquid-templated thiol-silica materials

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