Adsorption of an Anionic Azo Dye Using Moringa oleifera Seed Protein-Montmorillonite Composite

Abstract

In this study, Moringa oleifera seed protein-montmorillonite (MOSP-MMT) composite was synthetized using the impregnation method. The MOSP-MMT adsorbent was characterized using scanning electron microscope, X-ray diffraction, infrared spectroscopy, surface area analysis, and thermogravimetric analysis. The removal of water-soluble reactive red 2 (RR-2) from artificial wastewater by the MOSP-MMT composite was carried out in a batch system. The results indicated that RR-2 adsorption increased with contact time, and the pseudo-second-order equation was best to describe the adoption process among the three models. The RR-2 adsorption decreased from 7.60 to 5.92 mg/g as pH increased from 3.2 to 9.1 and increased from 15.2 to 17.1 mg/g as NaCl concentration increased from 0 to 30 g/L. The Freundlich isotherm model provided the better fit of the experimental data than the Langmuir model. The result showed that the MOSP-MMT composite could be a potential adsorbent for the treatment of wastewater containing RR-2.

Adsorption of Azo Dyes by a Novel Bio-Nanocomposite Based on Whey Protein Nanofibrils and Nano-clay: Equilibrium Isotherm and Kinetic Modeling

“…The surface area of the composite is very modest in comparison with pristine MMT (220-270 m 2 /g), bentonite micropowder (67 m 2 /g) (Bulut, Akçay, Elma, & Serhatlı, 2009), or similar composites e.g. clay-cellulose composite (31.16 m 2 /g) (Abu-Danso et al, 2020), Moringa oleifera seed protein-montmorillonite composite (4.90 m 2 /g) (Mi et al, 2019) or carbon/montmorillonite nanocomposite (39.5 m 2 /g) (Tong et al, 2018).…”

The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles

“…4 The fall in the adsorption capacities of the adsorbents for anionic dyes when raising the solution pH from acidic to alkaline was similar to that in the other studies. 2,3,17 Therefore, it can be concluded that a pH 3 was optimal for the adsorption of RR24 onto SBB-ZnO3 and CRHB-ZnO3, and the electrostatic attraction was the main mechanism for RR24 adsorption onto the biochars. Besides, there was also the contribution of pore lling, p-p interaction, and hydrogen bonding formation mechanisms in the adsorption process of RR24 onto the biochars.…”

“…Reactive dyes are widely used in industries, such as rubber, paper, leather, plastics, and textile. 1,2 Typically, approximately 40% of residual reactive dyes from the textile industry is released into the environment. 1 Owing to the poor xation, nondegradability, and toxicity properties as well as potential carcinogenicity, 3 mutagenicity, and teratogenicity, 4 reactive dyes can cause serious impacts to the human health and aquatic ecosystem.…”

Production and Optimization of Bio-Based Silica Nanoparticle from Teff Straw (Eragrostis tef) Using RSM-Based Modeling, Characterization Aspects, and Adsorption Efficacy of Methyl Orange Dye

“…According to Mi et al [21], X-ray diffraction was utilized to determine the crystalline and amorous phases of generated teff straw ash, as well as biosilica created from teff straw ash. During this investigation, the angle of diffraction (2-theta) on an XRD (make and model: Drawell XRD 7000) fluctuated from 5 °to 80 °.…”