Adsorptive removal of cationic and anionic dyes from aqueous solution by utilizing almond shell as bioadsorbent

Abstract

Almond shell is a food waste that is utilized as bioadsorbent for the uptake of Eriochrome Black T (EBT) and Malachite Green (MG) dyes from aqueous solutions. The biomaterial was characterized by specific surface area (BET), scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, and X-ray diffraction. The effects of the initial pH of solutions, particle size, adsorbent dosage, initial dye concentration, contact time, and temperature on the EBT and MG adsorption were studied using batch contact mode at 22°C. Rapid sorption dynamics following a second-order kinetic model were shown by kinetic studies. The adsorption equilibrium data were fitted well to the Freundlich isotherm for EBT and MG as anionic and cationic dyes, respectively. The adsorption of pollutants was exothermic (DH 0 = -1.7 kJ mol -1 for EBT and -32 kJ mol -1 for MG). The reaction was accompanied by a decrease in entropy (DS 0 \ 0 for EBT and MG). Negative values of DG 0 showed the spontaneity of the MG adsorption process. However, positive values of DG 0 showed that the EBT uptake by almond shell is not a spontaneous reaction. The results indicate that almond shell is a promising alternative for the biosorption of anionic (EBT) and cationic (MG) dyes from aqueous solutions.

Synthesis of novel biocomposite powder for simultaneous removal of hazardous ciprofloxacin and methylene blue: Central composite design, kinetic and isotherm studies using Brouers-Sotolongo family models

“…However, in the ChR structure, this peak was unnoticeable. In line with Ben Arfi et al [31], this can be explained by the presence of the C=O elongation vibration of ketones, carboxylate and methyl ester groups in pectin and its absence in the ChR structure.…”

“…In addition, although adsorption is considered as the favorite process to treat wastewater because of its simplicity, high efficiency, rapidity, eco-friendliness [26] and cost effectiveness [27]. Additionally, researchers have considered various conventional adsorbents such as silica-multiwall carbon nanotubes, silica/carbon nanotubes and silica/activated carbon [28][29][30], biomaterials [31,32], and other adsorbents have been investigated for various J o u r n a l P r e -p r o o f pollutants removal but they are not highly efficient. However, it seems that research has not yet succeeded to produce the most efficient adsorbent to remove two pollutants at the same time.…”

Effect of Almond Shell Waste on Physicochemical Properties of Polyester-Based Biocomposites

“…This by-product is normally incinerated or dumped without control, which results in the production of large amounts of waste and pollution [2]. Several researchers have focused on different alternatives for using almond shell wastes based on their potential uses as biomass to produce renewable energy [3]; as a source of organic biopesticides [4], heavy metal adsorbents [5], dye adsorbents [6], growing media [7], the preparation of activated carbons [8] and xylo-oligosaccharides [9], antioxidants [10] or as additives in eco-friendly composites [11][12][13].…”

Removal of Procion Red MX- 5B from aqueous solution by adsorption on Parkia speciosa (stink bean) peel powder

“…A conventional method such as biological treatment even though low cost but less persuasive to remove toxic compounds such as dye [9][10][11]. Adsorption onto agriculture waste has been promising to be one of the reliable physicochemical treatment methods to remove dye such as pineapple leaf peel, lime peel, almond shell, and other leaf-based adsorbents [7,12,13].…”