Synthesis of multi-organo-functionalized fibrous silica KCC-1 for highly efficient adsorption of acid fuchsine and acid orange II from aqueous solution

Abstract

Multi-functionalized fibrous silica KCC-1 (MF-KCC-1) bearing amine, tetrasulfide, and thiol groups was synthesized via a post-functionalization method and fully characterized by several methods such as FTIR, FESEM, EDX-Mapping, TEM, and N2 adsorption–desorption techniques. Due to abundant surface functional groups, accessible active adsorption sites, high surface area (572 m2 g−1), large pore volume (0.98 cm3 g−1), and unique fibrous structure, mesoporous MF-KCC-1 was used as a potential adsorbent for the uptake of acid fuchsine (AF) and acid orange II (AO) from water. Different adsorption factors such as pH of the dye solution, the amount of adsorbent, initial dye concentration, and contact time, affecting the uptake process were optimized and isotherm and kinetic studies were conducted to find the possible mechanism involved in the process. For both AF and AO dyes, the Langmuir isotherm model and the PFO kinetic model show the most agreement with the experimental data. According to the Langmuir isotherm, the calculated maximum adsorption capacity for AF and AO were found to be 574.5 mg g−1 and 605.9 mg g−1, respectively, surpassing most adsorption capacities reported until now which is indicative of the high potential of mesoporous MF-KCC-1 as an adsorbent for removal applications.

Efficiency and selectivity of cost-effective Zn-MOF for dye removal, kinetic and thermodynamic approach

“…The adsorption efficiency increased with an increase in Zn(BDC) due to the availability of more adsorption sites and consequently a larger surface Table 1 The comparison of the maximum adsorption capacity for the adsorption of three dyes onto various adsorbents reported in literature Dye Adsorbent q max (mg g −1 ) Conditions References area for dye uptake. Similar results were mentioned in the literature (Sharma et al 2021;Soltani et al 2021;Usman, Aftab, et al 2021b, a). Moreover, the smallest amount of Zn(BDC) which is saturated with AB refracted the highest selectivity of the surface towards AB.…”

Fabrication of a Nanoporous Silica Hydrogel by Cross-Linking of SiO2–H3BO3–Hexadecyltrimethoxysilane for Excellent Adsorption of Azo Dyes from Wastewater

“…The hydrogels were stable while maintaining NaOH concentrations from 0.1 to 1 mg L –1 in this study (see Supporting Information Table S2). For better understanding, we also compared the dye adsorption efficiency of the hydrogels with previously reported silica-based adsorbents, as shown in Supporting Information Table S3. − It is seen that the adsorption performances of the neutralized SiO 2 –H 3 BO 3 –HDTMS hydrogel are equivalent or even superior considering all testing parameters.…”

Amine-Grafted Pomegranate Peels for the Simultaneous Removal of Nitrate and Phosphate Anions from Wastewater

“…Other chemicals with amino functions, such as cetyltrimethylammonium bromide [53], polyethyleneimine [57], N-(3-chloro-2hydroxypropyl) trimethylammonium chloride (CHMAC) [55], and 3-aminopropyltriethoxy silane (APTES) [58] have also been commonly used to improve the adsorption of NO 3 − anions. Many studies in the last few years have focused on developing new hybrid materials and composites based on agricultural wastes and amino-alkyl silane (AAS) derivatives for the effective removal of various pollutants [58][59][60][61][62][63][64]. This is due to the presence of the amine function of the amino-alkyl silane derivative, which proves the great interest in the chemical surface functionalization of the adsorbents by the AAS moiety.…”