Synthesis of Nano-biocomposite Adsorbent and Investigation of Remediation of Reactive Black 5 Dye from Wastewater

When the wastes generated as a result of industrial production are directly released to the environment, they cause pollution of the ecosystem, which is valuable for all living things, with harmful and toxic substances and their derivatives. One of the most important of these wastes is synthetic chemical dyes. A lot of work is being done on waste management and waste disposal due to its importance. The purpose of our work was developed a new non-toxic and biodegradable biosorbent using sunflower waste material and chitosan. Later, we modified these biosorbents with nano-iron molecules to investigate the usability of this bio and nano-biosorbent in the removal of Reactive Black 5 (RB5) dye. The optimum removal conditions for RB5 dye were determined by examining the parameters (pH, temperature, contact time, etc.) for the removal of Reactive Black 5 dye. Surface and molecular changed and kinetic characterizations for bio and nano-biosorbent before and after dye removal were examined by UV-vis, SEM, TEM, FT-IR and XRD techniques. For UV-vis analysis, 597 nm was used as the highest absorbance wavelength of RB5. In paint removal studies using CS and CSN, the optimum dye removal time was found to be 90 minutes. For CS and CSN, it was determined that the optimum temperature 40 and 50 oC and acidic pH (2-4) were higher for RB5 dye removal, respectively. The superficial and molecular changes of the synthesized nano-biosorbent after its interactions with the dye have been demonstrated and explained using different techniques. It is understood from the results that it can adsorb 22.5 mg / g dye for CSN and 21.59 mg/g for CS. These removal rates and the fact that we have obtained these rates using bioabsorbent shows that the method can be used to successfully remove RB5 dye

Removal of algae from thermal mud pool: A case study in Koprukoy (Erzurum, Northeast (NE) Turkey) thermal spring area

ABSTRACT. Thermal spring areas, which are available globally, are used for recreational purposes or wellness applications because these areas have mineral-rich materials of thermal water and thermal muds. At the same time, thermal spring areas are one of the best habitats for algae among aquatic habitats. If algae formed on the surface of the thermal water in these areas, they create an ugly appearance and disrupt the aesthetics of the water because of their uncontrolled growth. The algae removal applications are the most effective methods for solution of these adversities in the thermal spring areas. In this work, experimental study was carried out to investigate the removal of algae from thermal water and thermal mud pools in the Delicermic-Koprukoy (Erzurum, NE Turkey) thermal spring area. For this purpose, some chemical materials were used for the removal of algae. The results of the experimental studies showed that the Al2SO3+CaO solution is a good material that provides 100% removal of algae from thermal water and thermal mud pools at pH 6.   KEY WORDS: Algae, Algae removal, Thermal water, Thermal mud, Spring area    Bull. Chem. Soc. Ethiop. 2022, 36(3), 545-553.                                                           DOI: https://dx.doi.org/10.4314/bcse.v36i3.

Proteolytic activities and safety use of Enterococcus faecalis strains isolated from Turkish White Pickled Cheese and milk samples

ΔΕΝ ΔΙΑΤΙΘΕΤΑΙ ΠΕΡΙΛΗΨΗIn this study, Enterococcus faecalis proteolytic strains which have the potential to degradation of bovine milk proteins were isolated from Turkish White Pickled Cheeses and milk samples. E. faecalis strains were found to have strong caseinolytic activity. The extracellular protease enzymes produced by E. faecalis strains from 60 different samples were analyzed in the pattern of bands on a stained SDS-PAGE gel. The highest proteolytic activity of E. faecalis isolates were determined at pH 7.0 and 40 ℃ for 24 h. In addition, antimicrobial resistance and the presence of selected virulence genes of isolates were investigated for microbiological safety. These findings further emphasize that the E. faecalis isolates can be effective in the degradation of bovine milk proteins

The Investigation of Removing Direct Blue 15 Dye from Wastewater Using Magnetic Luffa sponge NPs

In this study, loaded Luffa sponge membrane forms were modified with ZnO, Fe3O4, ZnO/Fe3O4 nanoparticles (NPs) to remove of Direct Blue 15 (DB15), which is a carcinogenic azo dye in aqueous solution. ZnO and Fe3O4 NPs were synthesized using purified peroxidase enzymes from Euphorbia amygdaloides using green synthesis method. Adsorption of DB15 azo dyes was separately studied with membrane forms (LS-pure, LS-ZnO, LS-Fe3O4, and LS-ZnO/Fe3O4). Optimum contact time, optimum pH, optimum temperature, optimum dye concentration, and optimum LS amount were found as 45 min, pH 8.0, 20°C, 200 mg/L, and 0.025 g in line with the optimization studies, respectively. The obtained membrane forms were characterized using SEM, FT-IR, and XRD techniques. According to obtained results, NPs loaded LS membrane forms are promising in removal of DB15 from textile wastewater contaminated water

EVALUATION OF ANTIOXIDANT, ANTIRADICALIC AND ANTIMICROBIAL ACTIVITIES OF OLIVE PITS (Olea eurOpaea L.)

The antioxidant and radical scavenging properties of olive pits (Olea europaea L.) were investigated through the following analyses in this study: The total antioxidant activity by the ferric thiocyanate method; 2,2'-azino-bis-(3-ethylbenzothiazole-6-sulphonate) (ABTS) radical scavenging activity; superoxide anion radical (O 2 -) scavenging activity; the total reduction power by the potassium ferricyanide reduction method; Cupric ions (Cu ). Besides, the total phenolic and flavonoid contents of the olive pits (OP) were determined. In addition, α-tocopherol, butylatedhydroxyanisole (BHA) and quercetin were used as reference antioxidant compounds. OP-aqueous and OP-ethanol extractsboth exhibited the highest phenol (OP-AE:95.3; OP-EE: 144.3 μg GAE mg -1 extract) and flavonoid (OP-AE: 183.7; OP-EE:262.4μg QE mg -1 extract) contents, and displayed the highest antioxidant activity. In addition, OP-AE and OP-EE exhibited higher antibacterial activity against eleven bacteria with Minimum Inhibitory Concentrations (MIC) values, ranging from 12.50 to 250 mu l/mL

Effects of mineral amendments on trace elements leaching from pre-treated marine sediment after simulated rainfall events

Bauxite extraction by-products (red mud) were used to evaluate their potential ability to stabilize trace elements from dredged and aerated/humidified marine sediment. The investigated by-products were: bauxaline®(BX) that is a press-filtered red mud; bauxsol™(BS) that is a press-filtered red mud previously washed with excess of seawater, and gypsum neutralized bauxaline® (GBX). These materials were separately mixed to dredged composted sediment sample considering 5% and 20% sediment: stabilizer ratios. For pilot experiments, rainfall events were regularly simulated for 3 months. Concentrations of As, Mo, Cd, Cr, Zn, Cu, and Ni were analyzed in collected leachates as well as toxicity. Results showed that Cd, Mo, Zn, and Cu were efficiently stabilized in the solid matrix when 20% of BX, BS, and GBX was applied. Consequently, toxicity of leachates was lower than for the untreated sediment, meaning that contaminants mobility was reduced. A 5% GBX was also efficient for Mo, Zn and Cu stabilization. In all scenarios, As stabilization was not improved. Compared to all other monitored elements, Mo mobility seemed to depend upon temperature-humidity conditions during pilot experiments suggesting the need of further investigations