Characteristics of uranium biosorption from aqueous solutions on fungus Pleurotus ostreatus

Abstract

Uranium(VI) biosorption from aqueous solutions was investigated in batch studies by using fungus Pleurotus ostreatus biomass. The optimal biosorption conditions were examined by investigating the reaction time, biomass dosage, pH, temperature, and uranium initial concentration. The interaction between fungus biomass and uranium was confirmed using Fourier transformed infrared (FT-IR), scanning electronic microscopy energy dispersive X-ray (SEM-EDX), and X-ray photoelectron spectroscopy (XPS) analysis. Results exhibited that the maximum biosorption capacity of uranium on P. ostreatus was 19.95 ± 1.17 mg/g at pH 4.0. Carboxylic, amine, as well as hydroxyl groups were involved in uranium biosorption according to FT-IR analysis. The pseudo-second-order model properly evaluated the U(VI) biosorption on fungus P. ostreatus biomass. The Langmuir equation provided better fitting in comparison with Freundlich isotherm models. The obtained thermodynamic parameters suggested that biosorption is feasible, endothermic, and spontaneous. SEM-EDX and XPS were additionally conducted to comprehend the biosorption process that could be described as a complex process involving several mechanisms of physical adsorption, chemisorptions, and ion exchange. Results obtained from this work indicated that fungus P. ostreatus biomass can be used as potential biosorbent to eliminate uranium or other radionuclides from aqueous solutions.

Lead and uranium sorptive removal from aqueous solution using magnetic and nonmagnetic fast pyrolysis rice husk biochars

“…The Pb(II) removal potential from aqueous solutions by BC (77.5 mg g À1 ) and MBC (110 mg g À1 ) was signicantly higher than other modied biochars (Table 4), such as those of oak wood-(10.1 mg g À1 ), 43 oak bark-(30.2 mg g À1 ), 30 bamboo-(25.1 mg g À1 ), 44 pine bark-(25.3 mg g À1 ), 45 romchar-(17.7 mg g À1 ) and oxford (32.2 mg g À1 ) derived biochars, 46 and close to those of sewage-(99.8 mg g À1 ) derived biochars. 47 For U(VI), the removal potential from aqueous solutions of the biochars tested herein (BC: 48.6 mg g À1 , MBC: 53.2 mg g À1 ) was signicantly higher than those of eucalyptus wood-(27.2 mg g À1 ), 48 fungus pleurotus ostreatus-(19.4 mg g À1 ) 49 and magnetic chitosan-(42 mg g À1 ) 51 derived bichars. However, BC and MBC showed the lower U(VI) removal potential as compared to activated cactus bre (214 mg g À1 ).…”

“…A band at 3420 cm À1 was observed and ascribed to the stretching vibration of O-H of both biochars. 49,55 The peaks at ca. 2360, 1620, and 1068 cm À1 corresponded to the N-H bond, the stretching of the C]C bond, and the C-O-C vibration of BC and MBC, respectively.…”

Applying Cryo-X-ray Photoelectron Spectroscopy to Study the Surface Chemical Composition of Fungi and Viruses

“…The focus of most of these fungal analyses were on cells from the species Saccharomyces, but a few studies of the yeast form of C. albicans have been reported (van der Mei et al, 2000). XPS has also been used to study uptake of metals into lyophilized micro and macro-fungi (Ding et al, 2015;Zhao et al, 2016) or interactions between fungal hyphae from Aspergillus aculeatus and graphene oxide (Zhang et al, 2016), whereas Dague et al (2008) combined XPS with AFM and ToF-SIMS to study the surface of freeze-dried Aspergillus fumigatus. (Gow et al, 2017).…”

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

“… adsorbent adsorption conditions q m (mg g −1 ) reference Bacillus sp. pH 3.0, 30°C 3.03 [ 37 ] Pleurotus ostreatus pH 4.0 19.95 [ 38 ] modified Spirulina platensis — 73 [ 39 ] sugar beet pulp — 20.45 [ 40 ] Solanum incanum leaves pH 4.0, 45°C 39.98 [ 41 ] Bacillus megaterium modified by sodium alginate pH 5.0, 30°C 74.61 this study …”