Removal of Azo Dye Carmoisine by Adsorption Process on Diatomite

Abstract

This work aims to evaluate the adsorption capacity of an abundant natural diatomite (ND) to remove the azo dye carmoisine, known as a harmful emerging organic pollutant. Indeed, to the best of our knowledge, no results were reported on this subject. The ND was characterized by FTIR, XRD, and SEM/EDX analyses. The experimental study of adsorption was carried out in batch mode. Results showed that ND adsorbent is mainly composed of silica. A fraction of calcite and ankerite was also identified. It is a porous material with a specific surface of about 41 m2.g-1 and with a hydroxyl surface functional group -OH. Adsorption results showed that adsorption process on ND is found to be effective in removing the carmoisine colorant. The adsorption capacity is strongly affected by the adsorbent and adsorbate contents, the solution pH, the work temperature, and the water hardness and mineralization. At room temperature, optimal experimental conditions for the highest adsorption capacity (12 mg.g-1) were colorant concentration 50mg.L-1, pH 2, contact time 30min, and ND content 1 g.L-1. Modeling study has showed that experimental results are well modeled by the Freundlich isotherm in multilayer adsorption. The reaction kinetics are pseudo-second order, and the thermodynamic parameters indicated that the nature of the adsorption process is endothermic and spontaneous.

Preparation and Superstrong Adsorption of a Novel La(Ⅲ)-Crosslinked Alginate/Modified Diatomite Macroparticle Composite for Anionic Dyes Removal from Aqueous Solutions

“…Hence, CPAM-Dia/SA-La gel spheres have the benefits of green environmental protection, superstrong adsorption capacity, good selectivity and easy separation from the water and without secondary pollution. At the same time, the q max (mg/g) values of other Dia-based adsorbents for the dyes are shown in Table 4 [ 61 , 62 , 63 , 64 , 65 , 66 ]. By comparing the reported research results, the CPAM-Dia/SA-La gel composite is confirmed to have extremely significant adsorption advantages for dyes.…”

Efficient Disposal of Basic Fuchsin Dye from Aqueous Media Using ZrO2/MgMn2O4/Mg(Mg0.333Mn1.333)O4 as a Novel and Facilely Synthesized Nanocomposite

“…It was found that the uptake efficacy of BFD dye decreased, whereas the uptake capability of the KE, KE500, and KE700 adsorbents increased with increasing initial dye concentrations. The Langmuir (Equation ( 5)) in addition to the Freundlich (Equation ( 6)) equilibrium equations [16,[37][38][39][40] were operated to study the linear fitting of the obtained experimental data owing to the disposal of BFD dye by the KE, KE500, and KE700 products, as displayed in Figure 14A,B, respectively.…”

Surfactant supported chitosan for efficient removal of Cr(VI) and anionic food stuff dyes from aquatic solutions

“…Sunset Yellow and Azorubine are derived from petroleum, and widely used in most food products, including juices, soft drinks, candies, jellies, and salty snacks, to give coloring 9 . The presence of these food coloring substances decreases the aesthetic value of an aquatic system, contributes to higher chemical oxygen demand (COD), and influences the passing of light 10 , 11 . Additionally, these dyes have harmful effects on human health as their metabolites are mutagenic, carcinogenic, and are hyperactive in children 12 .…”