Adsorption of basic dyes from model aqueous solutions onto novel spherical silica support

Abstract

Removal of CI Basic Blue 9 or CI Basic Red 5 from model aqueous solutions has been studied with spherical silica precipitated in an emulsion system used as an adsorbent. The process of removal of the dye impurities has been studied for the dyes in a wide range of concentrations (50-2000 mg dm )3 ) in model systems. The degree of dye adsorption, chemical stability of the pigments obtained and their detailed physicochemical and morphological characterisation have been ascertained. In particular, the dye removal method proposed has been found to be highly effective in removing CI Basic Blue 9 (99.9%). The degree of dye extraction from the silica (SiO 2 ) surface at the dye concentration in the model solutions in the range 1000-2000 mg dm )3 did not exceed 1.0%. The pigment composites produced are characterised by high uniformity of the particles (polydispersity index = 0.005) with the diameters ranging from 360 to 510 nm. The pigment particles are spherical in shape and of intense blue or red colour.

Adsorptive removal of methyl orange and methylene blue from aqueous solution with a metal-organic framework material, iron terephthalate (MOF-235)

“…Among the proposed methods, removal of dyes by adsorption technologies is regarded as one of the competitive methods because of high efficiency, economic feasibility and simplicity of design/operation [3,4]. Moreover, adsorption of dyes on inorganic supports like silica is important to produce pigments [5,6].…”

Covalent organic framework and montomorillonite nanocomposite as advanced adsorbent: synthesis, characterization, and application in simultaneous adsorption of cationic and anionic dyes

“…The adsorption method is simple and also popular due to its high capacity, high speed, high efficiency, low cost, applicability to large-scale, and ability to regenerate active surface of adsorbents [23]. In addition, pigments can be produced by adsorption of dyes on inorganic supports such as silica [30,31].…”

Mechanism and properties of coloured nanoscale SiO2 prepared from silica and reactive dyes

“…SiO 2 is widely used in the field of catalyst supports [1][2][3][4], metal ion and organic dye adsorbents [5,6], polymer composite fillers [7][8][9][10][11][12][13], biomedicine supports, etc. [14][15][16], owing to its porous nature, large surface area, and excellent mechanical and thermal properties [17].…”