The sorption of cationic and anionic heavy metal species on the biosorbent of Aspergillus terreus: Isotherm, kinetics studies

Abstract

In this study, the capacity of Aspergillus terreus fungus biomass to remove Cr (VI) and Cd from aqueous solution was investigated. The present experimental study employed the shake flask method to cultivate fungal biomass. For the preparation of adsorbent, after inoculation of Aspergillus terreus in PDA medium, it was placed on a shaker at 150 rpm, at 25°C for 4 days. After separation of living biomass, it was boiled in a 0.5% NaOH solution. The ability of the biomass to remove of Cr (VI) and Cd from aqueous solution was examined under conditions including initial concentrations of (20–120 mg/L); pH of 3, 5, 7, and 9; contact times of 15–120 min; and the adsorbent doses of 0.1, 0.2, 0.5, 1, and 2 g. The concentration of the heavy metals was determined by an atomic absorption device. The results showed that in the optimum conditions of the input variables; contact time of 90 min, pH of 7, the initial metal concentration of 20 mg/L, and the adsorbent dose of 1 g, the removal efficiency of Cd and Cr (VI) was 94 and 89%, respectively. The processes of Cd and Cr (VI) adsorption were successfully described by Freundlich isotherm with R2 = 0.9463 and R2 = 0.9949, respectively, and well‐followed pseudo‐first‐order kinetic with R2 = 0.9935 and R2 = 0.9718, respectively. Due to the high adsorption capacity of this biomass in removing metals in comparison to other adsorbents, it can be proposed as a suitable adsorbent in treatment processes.

Removal of Heavy Metals in Water with Biosorbtion Method Using Different Biosorbents

“…In the studies conducted with the batch method, the removal of heavy metals at different pH's and low concentrations in water was investigated. (Shokoohi et al, 2020;Tengxia et al, 2020).…”

“…Biosorbent sources such as bacteria (Abedinzadeh et al, 2020), fungi (Qin et al, 2020;Verma et al, 2013) yeasts (Yasmin et al, 2020), algae (Liu et al, 2018), shellfish ( (Keshvardoostchokami et al, 2017), plants (Parthasarathy and Narayanan, 2014) are used in biosorption applications. Biosorbtion studies performed with biologically sourced adsorbents are in a very interesting position in terms of easy application stages, low cost, high biosorption efficiency, reuse of the adsorbent and not containing toxic chemicals that will harm health (Qin et al, 2020;Shokoohi et al, 2020;Khameneh and Moharreri, 2020).…”

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

“…Fitting the experimental data to an intraparticle diffusion model is the most widely used method for determining the mechanism involved in the sorption process. One or more processes, such as boundary layer (film) or external diffusion, diffusion at the surface, internal pore diffusion, or a combination of several steps, may be used to approximate the overall adsorption of solute onto the solid surface [ 21 , 60 ].…”

Adsorption of Metals Ions From Single and Binary Aqueous Systems on Bio – Nanocomposite, Alginate – Clay

“…Fitting the experimental data to an intraparticle diffusion model is the most widely used method for determining the mechanism involved in the sorption process. One or more processes, such as boundary layer (film) or external diffusion, diffusion at the surface, internal pore diffusion, or a combination of several steps, may be used to approximate the overall adsorption of solute onto the solid surface [20,39].…”