Adsorption of congo red dye from aqueous solution onto amino-functionalized silica gel

Farias, Raquel Studart de; Buarque, Hugo Leonardo de Brito; Cruz, Mabel Ribeiro da; Cardoso, Luana Meg Freitas; Gondim, Tamyris de Aquino; Paulo, Vanessa Rodrigues de

doi:10.1590/s1413-41522018172982

Cited by 58 publications

(20 citation statements)

References 28 publications

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“…The removal of toxic dyes, such as acid yellow (adsorption capacity of 9.7 mg/g) [19], rhodamine B (adsorption capacity in the range 25-41 mg/g) [20], Congo red (adsorption capacity of 66.5 mg/g) [21] and methylene blue (MB), from wastewaters was attempted using silica-based materials as adsorbents. In this context, mesoporous silica impregnated with dodecyl-trimethyl-ammonium bromide deposited on a titania honeycomb structure can adsorb 95.95 mg MB/g [22].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

Anghel

Lascu

Epuran

et al. 2020

IJMS

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Multifunctional hybrid materials with applications in gas sensing or dye removal from wastewaters were obtained by incorporation into silica matrices of either Pt(II)-5,10,15,20-tetra-(4-allyloxy-phenyl)-porphyrin (PtTAOPP) or platinum nanoparticles (PtNPs) alone or accompanied by 5,10,15,20-tetra-(4-allyloxy-phenyl)-porphyrin (TAOPP). The tetraethylorthosilicate (TEOS)-based silica matrices were obtained by using the sol-gel method performed in two step acid-base catalysis. Optical, structural and morphological properties of the hybrid materials were determined and compared by UV-vis, fluorescence and FT-IR spectroscopy techniques, by atomic force microscopy (AFM) and high resolution transmission electron microscopy (HRTEM) and by Brunauer–Emmett–Teller (BET) analysis. PtTAOPP-silica hybrid was the most efficient material both for CO2 adsorption (0.025 mol/g) and for methylene blue adsorption (7.26 mg/g) from wastewaters. These results were expected due to both the ink-bottle mesopores having large necks that exist in this hybrid material and to the presence of the porphyrin moiety that facilitates chemical interactions with either CO2 gas or the dye molecule. Kinetic studies concerning the mechanism of dye adsorption demonstrated a second order kinetic model, thus it might be attributed to both physical and chemical processes.

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Section: Introductionmentioning

confidence: 99%

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

Anghel

Lascu

Epuran

et al. 2020

IJMS

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“…Although many treatment processes were adopted to remove Congo red from solutions, few studies have used cheap, clean, and ecofriendly adsorbents such nanosilica . Farias et al (12) investigated the recovering of Congo red dye from aqueous solution using amino-functionalized silica gel as an adsorbent. Their data of equilibrium adsorption were analyzed using many adsorption isotherms, but Langmuir isotherms show the best fitting, while Kinetic data will give good fitting with pseudo-second order.…”

Section: Figure1 Chemical Formula Of Cr Dyementioning

confidence: 99%

Removal of Congo Red Dye From Aqueous Solution Using Eco-Friendly Adsorbent of Nanosilica

Ali

2021

Baghdad Sci.J

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The development of a new, cheap, efficient, and ecofriendly adsorbents has become an important demand for the treatment of waste water, so nano silica is considered a good choice. A sample of nanosilica (NS) was prepared from sodium silicate as precursor and the nonionic surfactant Tween 20 as a template. The prepared sample was characterized using various characterization techniques such as FT-IR, AFM, SEM and EDX analysis. The spectrum of FTIR confirms the presence of silica in the sample, while SEM analysis of sample shows nanostructures with pore ranging (2-100nm). The adsorptive properties of this sample were studied by removing Congo red dye (CR) from aqueous solution. Batch experimental methods were carried out at room temperature (25⁰C) to study the different variables which affect the adsorption process like: NS amount, initial concentration of CR, and contact time. The results were 0.2 g of NS/50 ml of dye solution and 60 min contact time to reach equilibrium. The experimental results at equilibrium were analyzed using Langmuir and Freundlich adsorption isotherms and showed the best fitted with Freundlich model which reveal heterogeneity of the surface of NS adsorbent. Kinetics aspects were also investigated by evaluating parameters from pseudo-first and pseudo-second order reaction equations on adsorption rate which show good fitting with both kinetics equations, but pseudosecond order equation was the best to describe the kinetics parameters.

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“…In contrary to other reported papers, wherein adsorption of dye at pH 2.0 is negligible, the result is interesting. 16 By using these optimum conditions, most of the synthetic dyes (more than 90%) were absorbed onto silica. Unless otherwise stated, further experiments were conducted at these optimum conditions.…”

Section: Application Of Silica As Dyes Adsorbent Optimum Adsorption Conditions and Adsorption Isothermsmentioning

confidence: 99%

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

Firdaus¹,

Madina²,

Yulia³

et al. 2020

RJC

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Beach sand is an abundant natural resource that contains silica minerals with many benefits. One of the uses of silica is to remove synthetic dyes that are toxic to biota in the environment. The goal of this research was to extract and characterize the silica from Bengkulu beach sand and to apply it as dyes adsorbent. The extraction of silica consisted of two steps that were potassium silicate formation and gel formation. The gel was formed by adding strong acid into a potassium silicate solution. Silica's particle size and crystallinity were characterized using PSA and XRD, respectively. SEM-EDS was used to characterize the morphology and chemical composition of extracted silica. The effect of the different experimental settings, like pH, temperature, contact time, the concentration of dyes and adsorbent weight, on adsorption of dyes were monitored as well as the study of adsorption isotherms, kinetics, and thermodynamics. At equilibrium, synthetic dyes adsorption to silica suited to the Freundlich model producing correlation coefficients (R 2 ) of 0.853 and 0.976 for remazol blue and congo red, respectively. At optimum conditions, maximum adsorption capacities for remazol blue and congo red were 133 and 131 mg/g, respectively. The research implied that adsorption of dyes to silica fitted the pseudo-second-order model with thermodynamic values of ∆G°, ∆H°, and ∆S° were -4.04 to 2.19 kJ/mol, -13.53 to -4.726 kJ/mol, and 0.019 to 0.021 J/mol.K, respectively. By using these results, we resolve that the adsorption of dyes trends was exothermic and spontaneous. In addition, the reaction increases the system's entropy. This study emphasizes the potential of silica from the sand beach as a substitute economical adsorbent for the toxic dyes removal.

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Adsorption of congo red dye from aqueous solution onto amino-functionalized silica gel

Cited by 58 publications

References 28 publications

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

Hybrid Materials Based on Silica Matrices Impregnated with Pt-Porphyrin or PtNPs Destined for CO2 Gas Detection or for Wastewaters Color Removal

Removal of Congo Red Dye From Aqueous Solution Using Eco-Friendly Adsorbent of Nanosilica

Silica Extraction From Beach Sand for Dyes Removal: Isotherms, Kinetics and Thermodynamics

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