Biosorption study of anionic dyes from aqueous solutions using Bacillus amyloliquefaciens

Abstract

In this study, the biosorption of two commonly used dyes, namely Acid Blue 225 (AB 225) and Acid Blue 062 (AB 062), from aqueous solutions by Bacillus amyloliquefaciens biomass was studied in a batch system with respect to initial dye concentration, pH, adsorbent dosage, and contact time. The biomass exhibited maximum uptake at pH 1 due to its positive nature at acidic pH and the anionic nature of the dyes. Kinetic studies showed that the biosorption of dyes on biomass was a gradual process. An equilibrium was reached in 90 min for both dyes. The kinetic studies indicated that a pseudo‐second‐order rate equation was able to provide a realistic description of biosorption kinetics of the dyes. The constants obtained from the pseudo‐second‐order kinetic model at different temperatures were evaluated and the activation energies for the biosorption of AB 225 and AB 062 were found to be 13.52 and 13.62 kJ/mol, respectively. Isotherm studies pointed out that biosorption of dyes on biomass followed the Langmuir isotherm model. The adsorption capacity of biomass for AB 225 and AB 062 were 111.15 and 112.19 mg/g, respectively. Thermodynamic quantities that characterize the biosorption phenomena, i.e. enthalpy, entropy, and free energy change of the adsorption, were calculated leading to a conclusion on the efficiency of the properties of the biosorbent‐dye systems.

Biosorption performances of raw and chemically modified biomasses fromPerenniporia subacidafor heterocycle dye Neutral Red

“…Dye uptake of Neutral Red displayed a typical bell-shaped pH profile, which exhibited stronger capability over a broad pH range of 1.0-6.0, with an optimum pH at 3.0 for all the treated and untreated P. subacida biomasses. This result was consistent with the previous study [19] which showed lower pH was available for anionic dyes biosorption. Higher dye uptake obtained at relatively lower pH might be due to the electrostatic interaction between negatively charged dye molecules and positively charged fungal cell surface [20].…”

Renewable Energy from Waste: Investigation of Co-pyrolysis between Sargassum Macroalgae and Polystyrene

“…Biofuel produced from biomass has many advantages over traditional fossil fuels, including renewability, greater energy security, and foreign exchange savings. − In addition, biofuels from cellulosic feedstocks reduce greenhouse gas (GHG) emissions by about 80% . Use of aquatic biomass, especially algae, as a renewable energy resource is particularly promising. , Unlike land sources of biomass, algae can grow in marine water, fresh water, or even wastewater treatment ponds and, thus, does not compete with other land uses, such as growing crops for food .…”

Studies on the Removal of Indigo Carmin from Aqueous Solutions by GO, Oxidized MWCNTs, AC, and MWCNTs

“…Significant parts of several million tons of dyes are usually drained into water systems contaminating them by dyes. So, it is essential to remove this organic contaminant via a suitable therapy method (3,4).Several treatment procedures, such as coagulation, oxidative process, electrolysis sedimentation, and adsorption have been proposed for removing dye from effluent. Among these methods, the adsorption has been found to be very competitive into other processes due to its higher adsorption capacity, lower cost, and efficiency.…”

“…Among these methods, the adsorption has been found to be very competitive into other processes due to its higher adsorption capacity, lower cost, and efficiency. Multiabsorbent methods are applied to remove dye from water and effluent, such as agroindustrial chitosan, minerals, byproduct, bacterial, and fungal biomass, multiwalled carbon nanotubes (MWCNTs), Oxidized multiwalled carbon nanotubes (Oxidized MWCNTs), activated carbon(AC), and Graphene oxide (GO) (3)(4)(5)(6).…”