Hexadecyltrimethylammonium Bromide Surfactant-Supported Silica Material for the Effective Adsorption of Metanil Yellow Dye

Abstract

The adsorption behavior of an organic dye, metanil yellow (My), from water using micro–nano silica particles (MNSPs) was investigated. MCM-41-like (Mobil Composition of Matter No. 41) MNSPs were synthesized using tetraethoxy orthosilicate as a silica source and hexadecyltrimethylammonium bromide (CTAB) as a surfactant under basic conditions. Comparative studies were performed to assess the adsorption behaviors of the organic dye using the as-synthesized MCM-41 before the removal of CTAB and MCM-41, either after one, two, and three times of chemical etching or after calcination. My was adsorbed more effectively from water on the as-synthesized MCM-41 without the removal of the surfactant than on MCM-41 after the removal of the surfactant by chemical etching or calcination. In addition, MCM-41 after removing the surfactant by one-time chemical etching in the presence of hydrochloric acid also showed better adsorption of My from water than MCM-41 after removing the surfactant by further two and three times of chemical etching or calcination. For comparison, other kinds of dye molecules with different chemical structures such as methylene blue (Mb) and rhodamine B (Rb) were also used to check the possibility of adsorption of various dyes by the CTAB-supported MNSPs. To better understand the reason behind the adsorption phenomena, detailed studies on the kinetics and thermodynamics of adsorption of the MNSPs were performed. Excellent adsorption of My was observed at concentrations up to 100 mg L –1 at 25 °C, whereas the adsorption was lower at higher concentrations of the My dye. Furthermore, enhanced My dye adsorption was observed at higher concentrations by increasing the adsorption temperature. It can be concluded that the MNSPs exhibited efficient adsorption of My, when the MNSPs are used without the removal of the surfactant and any further modifications, suggesting that the surfactant played key roles in the effective adsorption of the anionic dye. The as-synthesized MCM-41 was, however, not a good adsorbent for cationic dyes such as Mb and Rb.

Synthesis of size-controlled and highly monodispersed silica nanoparticles using a short alkyl-chain fluorinated surfactant

“…SiNPs also exhibit more negative zeta potential values at mild acidic and basic conditions. 4,39,40 This leads to the formation of primary particles due to the nucleation of SiO 2 particles. 4,39,40 These results obey the isoelectric point of silica (pH $3).…”

“…4,39,40 This leads to the formation of primary particles due to the nucleation of SiO 2 particles. 4,39,40 These results obey the isoelectric point of silica (pH $3). 41 The presence of both carboxylic and hydroxyl functional groups in MAF-OH slightly altered the pH of silica particles based on the MAF-OH amounts, which may be the reason to get some shi in the zeta potential values.…”

“…Recently, silica nanoparticles (SiNPs) have attracted considerable attention in various applications such as drug delivery; adsorption and separation of proteins, dyes, metal ions, and oil/ water; and catalysis, among others. [1][2][3][4][5][6][7] The main advantages of using SiNPs are their low toxicity, excellent thermal stability, facile approach, biocompatibility, abundance in earth, and easier synthesis. 1,8 Another advantage of SiNPs is their ability to modify surface properties with various functional groups for developing hydrophilic and hydrophobic functional groups, which may enhance the dispersibility, stability, and compatibility with other materials.…”

Photodegradation of Azo Dyes in Sunlight Promoted by Nitrogen–Sulfur–Phosphorus Codoped Carbon Dots

“…Presently, the methods for detecting azo dyes include chromatographic techniques such as high-performance liquid chromatography (HPLC) and liquid chromatography with mass spectrometry (LC-MS) . The standard methods used for removal of azo dyes includes adsorption, ,, the photo-Fenton process, , and advanced oxidation processes (AOPs) . Among these, AOPs via photocatalytic degradation hold a huge potential toward the treatment of organic contaminants in aqueous media via the generation of reactive oxygen radicals/species, − with the advantage that upon treatment no secondary contaminants are produced.…”

Environmental method for preparation of higher color strength dyeing cotton fabrics with colored nanosilica pigment

“…Inorganic loaded materials exhibited good durability and mechanical strength (Geng et al 2016). Porous silica materials have been focused in the area of dye adsorption, because of their large space, porous structure, high surface area and low refractive coe cient (Liang et al 2017;Nagappan et al 2019), which it can promote pigment color strength and chemical stability. Moreover, porous silica materials have some superiority in its harmlessness for humans, and good control, recycled and economical property (Geng et al 2016).…”