Optimization with Response Surface Methodology of biosorption conditions of Hg(II) ions from aqueous media by Polyporus Squamosus fungi as a new biosorbent

Abstract

Abstract:Removal of mercury(II) (Hg(II)) from aqueous media by a new biosorbent was carried out. Natural Polyporus squamosus fungus, which according to the literature has not been used for the purpose of Hg(II) biosorption before, was utilized as a low-cost biosorbent, and the biosorption conditions were analyzed by response surface methodology (RSM). Medium parameters which were expected to affect the biosorption of Hg(II) were determined to be initial pH, initial Hg(II) concentration (C o ), temperature (T (°C)), and contact time (min). All experiments were carried out in a batch system using 250 mL fl asks containing 100 mL solution with a magnetic stirrer. The Hg(II) concentrations remaining in fi ltration solutions after biosorption were analyzed using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). Based on the RSM results, the optimal conditions were found to be 5.30, 47.39 mg/L, 20°C and 254.9 min for pH, C o , T (°C), and contact time, respectively. Under these optimal conditions, the maximum biosorbed amount and the biosorption yield were calculated to be 3.54 mg/g and 35.37%, respectively. This result was confi rmed by experiments. This result shows that Polyporus squamosus has a specifi c affi nity for Hg ions. Under optimal conditions, by increasing the amount of Polyporus squamosus used, it can be concluded that all Hg ions will be removed.

Empirical Model for Optimizing Shea Butter Extraction in an Unbaffled Vessel Equipped with an Impeller

“…The plot proves a high reliability of the model as the experimental yields and the predicted yields for the extraction are very close. This result is supported by other researchers [17,18]. A second-order polynomial model for the response is described by Eq.…”

Removal of Heavy Metal Ions from Wastewaters: An Application of Sodium Trithiocarbonate and Wastewater Toxicity Assessment

“…Moreover, a high value of the corrected coefficient of determination (85.32%) indicates a high degree of model fit to another sample of data from the same population. The obtained values ( R 2 ) are comparable to the other available data regarding heavy metal removal from real power plant wastewater using electrocoagulation ( R 2 = 99.5% and R 2 = 99.6% for iron and nickel, respectively) [ 63 ], biosorption of Hg (II) ions from aqueous media by Polyporus squamosus ( R 2 = 92.4%) [ 64 ] and optimization of coagulation–flocculation process for wastewater originating from automotive industry and containing Fe, Cr, Cu ions ( R 2 = 92.08%, R 2 = 93.62%, R 2 = 71.87% for Fe, Cr, Cu removal, respectively) [ 65 ] and also for organic substances ( R 2 = 0.8477, R 2 adj = 0.7462) [ 66 , 67 ]. Table 5 presents the results of the model adequacy verification using an analysis of variance.…”

Archives of Environmental Protection

“…Biosorption method uses organisms such as fungi, bacteria, algae, moss, lignocellulose or cereal bark to absorb heavy metal ions dissolved in water (Holan et al 1993, Lee et al 2011, Kratochvil et al 1998, Uzun et al 2017. Then solid biosorbents are used in liquid-phase separation to remove heavy metal ions in an aqueous solution.…”