Amine-functionalized silica nanoparticle: Preparation, characterization and anionic dye removal ability (original) (raw)
Related papers
2023
Synthetic dyes were considered harmful due to their toxic, carcinogenic, and nonbiodegradable chemicals. Anionic (congo red (CR) and methyl orange (MO)) and cationic (methylene blue (MB) and Janus green B (JGB)) dyes are used in this study due to their ability to restrict oxygen and sunlight dispersion. The discharge of dyes can degrade aquatic systems. This study has investigated the potential of dyes' adsorption behaviour in silica nanocapsules (SiNCs) adsorbents. Silica nanocapsules (SiNCs) were synthesized using oil-in-water (o/w) emulsion by employing different solvents (ethanol (SiNC E), ethyl ether (SiNC EE), and toluene (SiNC T) to understand the effect of solvents on SINCs' structure and effective dye adsorption. Which found that toluene and ethyl ether were effective solvents to produce silica nanocapsules. SiNC T and SiNC EE were both hollow cores, while the SiNC E structure was spherical. SiNC T adsorbent had high selectivity removal of CR > MO and JGB > MB, in which the adsorption capacity was 0.102 mmol/g at pH 2, 0.029 mmol/g at pH 2, 0.0999 mmol/g at pH 10, and 0.0944 mmol/g at pH 12 for 24 h for CR, MO, JGB, and MB, respectively. The kinetic study shows that the adsorption of dyes follows pseudo-second-order. The experimental data followed the Langmuir isotherm model and gave maximum adsorption capacities of 0.0979 and 0.4147 mmol/g for CR and JGB, respectively. SiNC T was recycled and reused for six consecutive cycles. Developed adsorbents are low-cost, highly efficient, and viable materials to be used in wastewater treatment.
Treatment of textile dye wastewater using modified silica
Dyes and Pigments, 2007
In this work a 'carrier' was selected that would separate an anionic reactive dye from aqueous solution, and would display an intense white colour and a high adsorptive capacity. In this context, a commercial, highly dispersed precipitate, Syloid Ò 244 silica was employed to remove C.I. Reactive Blue 19. The adsorption resulted in blue pigmentation of the silica carrier; the ensuing pigment was subjected to a comprehensive physicochemical analysis, including particle size, particle size distribution, polydispersity, tendency to form primary and secondary agglomerates and the morphology of the particle surface. It was found that a preliminary surface modification of the silica adsorbent with an NH 2 -silane compound was necessary. The aminosilane-modified silica could be used as a selective adsorbent in the purification of waste dye solutions; its application secured highly efficient removal of dye from solutions (in most cases over 90% and in some cases even 100%). The silica-carrier product was then used as a pigment within an exterior acrylic paint. Optimum properties were obtained using 5% silane; the ensuing pigment displayed very low polydispersity (0.030), low mean particle diameter (428 nm) and no tendency to form secondary agglomerates.
The Application of Sio2 Nanoparticles for Anionic Dye Removal from Aqueous Solution
Archives of Hygiene Sciences
Historically, the development of human life style has been associated with the need to large amount of energies and chemicals that might be destructive and hazardous for the environment (1-2). The dyes are of major class of the chemicals which have various target industries such as textiles, leather, paper, printing and cosmetics but the highest amount of dyes is used in textile industries (3-4). Dyes are drastically used in these industries and can generate the colorful wastewater (5). This produced wastewater which can simply release into environment and be considered as a major risk for various type of life in environments (6-7). Among various types of dyes, the reactive dyes are identified as widely used dyes to colorize the fibers (8). A large amount of these dyes (50%) is lost during dying and it is obvious that great volume of colorful wastewater is producing by this part (9). The toxicity and aesthetic risks of the dyes has been reported in various literatures. They are supposed to participate in some diseases such
Adsorptive removal of anionic dyes by modified nanoporous silica SBA-3
Applied Surface Science, 2010
Batch sorption experiments were carried out to remove dyes, methyl orange (MO), orange G (OG) and brilliant red X-3B (X-3B), from their aqueous solutions using a mesoporous silica SBA-3 as an adsorbent. The effect of surfactant template in SBA-3 on the removal of OG, MO and X-3B was investigated. Experiments were carried out to investigate the influence of contact time, initial concentration, pH, and adsorbent dosage on the adsorption performance. The adsorption results of anionic dyes on the uncalcined SBA-3 (noted as SBA-3) were compared with those of the calcined SBA-3 (noted as C-SBA-3). The uncalcined SBA-3 adsorbent has a large adsorption capacity and a strong affinity for the anionic dyes. Langmuir, Freundlich and Temkin isotherms were employed to model the experimental results, from which the Freundlich isotherm exhibited the most appropriate to predict the same. Freundlich isotherm exhibited the most appropriate to predict the experimental results. The kinetic data were also analyzed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on mesoporous SBA-3.
Removal of water-soluble cationic dyes with TriSyl silicas
Turk J Chem, 1998
In this study, the adsorption of certain water-soluble cationic dyes, (basic blue 9, basic blue 12, basic blue 17, brilliant cresyl blue, janus green B, basic green 4, basic violet 1, basic violet 3, and thionin) onto TriSyl silicas by batch adsorption at 25 ... ° C was investigated. In the ...
Adsorption of congo red dye from aqueous solution onto amino-functionalized silica gel
Engenharia Sanitaria e Ambiental
This study investigates the potential use of amino-functionalized silica gel as an adsorbent for the recovering of congo red dye from aqueous solution. The effects of pH, contact time, and temperature were determined and evaluated. Equilibrium isotherms were also studied. The adsorption kinetics was modeled by pseudo-first order and pseudo-second order. Furthermore, desorption of congo red was preliminarily studied. The pH range from 4.5 to 7.0 was favorable for the adsorption of congo red onto amine modified silica at 25ºC. Higher adsorption capacity was obtained at 50ºC. Langmuir and Freundlich models were fitted to the adsorption equilibrium data. The best fittings were obtained with the pseudo-second order and Langmuir model for kinetics and equilibrium, respectively. Desorption studies suggest that ion exchange might be the major mode of adsorption. KOH solution was the best desorbing agent for recovering the adsorbed dye.
Journal of environmental chemical engineering, 2018
Highlights Enhanced adsorption of Acid Yellow 17 in water on modified Electrospun Silica nanofibres (NF) Modified by etching Electrospun Silica NF, surface protected by ionene chloride polyelectrolyte Dye adsorption follows non-linear pseudo-second-order kinetics, and Freundlich isotherm Exothermic adsorption on modified silica NF but endothermic process on silica NF Modified Silica NF remains mostly efficient in dye removal even after 5 regeneration cycles ABSTRACT Sorbents for environmental remediation, based on Advanced Materials, have attracted research interest because of their better selectivity, reusability and resolution of disposal problems at endof-life, relative to conventional activated carbon based sorbents. The adsorption behavior of noncalcinated, electrospun Silica nanofibres, with no additional co-electrospun fibre-forming polymer present, has not been much reported. This work describes the preparation and performance of a recyclable nanofibrous silica adsorbent, to effectively capture a highly water soluble anionic dye, Acid yellow 17(AY17), from water. The physical structure and chemical composition of the electrospun silica nanofibres and its modified form were elucidated by their infrared and X-ray Diffraction spectra, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), and nitrogen adsorption-desorption analysis. The adsorptive removal efficiency, of the modified and as-is silica nanofibres, against AY17 was 100% and 54.6%, respectively. Improved adsorption is achieved through micropore formation, and introduction of positively charged moieties on alkali etching of the silica nanofibres, after surface protection with the prepared ionene chloride polyelectrolyte. The nature of equilibrium adsorption data was more favorably described by nonlinear form of the Freundlich isotherm, and the non-linear pseudo-second-order kinetic model. The
Review of the use of mesoporous silicas for removing dye from textile wastewater
EUROPEAN JOURNAL OF ENVIRONMENTAL SCIENCES, 2014
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.
Nanomaterials, 2019
In this work, new smart mesoporous amine-functionalized silica nanoparticles were prepared from hydrolyzing microgels based on N-isopropyl acrylamide-co-vinyltrimethoxysilane microgels with tetraethoxysilicate and 3-aminopropyltriethoxysilane by sol-gel method. The thermal stability and Fourier transform infrared were used to determine the amine contents of the silica nanoparticles. The pH sensitivity of the synthesized silica nanoparticles in their aqueous solutions was evaluated by using dynamic light scattering (DLS) and zeta potential measurements. The porosity of the amine-functionalized silica nanoparticles was evaluated from a transmittance electron microscope and Brunauer-Emmett-Teller (BET) plot. The results have positively recommended the pH-sensitive amine-functionalized silica nanoparticles as one of the effective nano-adsorbent to remove 313 mg·g−1 of CB-R250 water pollutant.
Surface-functionalized silica gel adsorbents for efficient remediation of cationic dyes
Pure and Applied Chemistry, 2014
The toxic and non-biodegradable nature of organic dyes necessitates the design and synthesis of novel adsorbents for their effective removal from the environment. This study reports an effective remediation behavior of surface-functionalized silica gel against water-soluble cationic dyes (up to 98 % removal). Thiol groups were functionalized at the surface of silica gel (SiO2–SH). The surface-tethered –SH groups were further oxidized to sulfonic acid groups to generate the negatively charged moieties at the surface of silica gel (SiO2–SO3 H). The morphology of the developed adsorbents and the surface modifications were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Uptake study of three cationic dyes, namely, rhodamine B (Rh B), rhodamine 6G (Rh 6G), and crystal violet (CV) with SiO2–SH and SiO2–SO3 H adsorbents was performed by varying the adsorbent amount, contact time, pH of solution, and te...