Yılmaz KAYA

Article | 2020 | Catalysts10 ( 6 )

The indiscriminate use of chemical pesticides alongside the expansion of large-scale industries globally can critically jeopardize marine ecology and the well-being of mankind. This is because the agricultural runoffs and industrial effluents eventually enter waterways before flowing into highly saline environments i.e., oceans. Herein, the study assessed two novel bacterial isolates,Bacillus subtilisstrain H1 andBacillus thuringiensisstrain H2 from the hypersaline Lake Tuz in Turkey to degrade recalcitrant haloalkanoic acids, haloacetates and chlorpyrifos, and consequently, identify their optimal pollutant concentrations, pH and te . . .mperature alongside salt-tolerance thresholds.Bacillusstrains H1 and H2 optimally degraded 2,2-dichloropropionic acid (2,2-DCP) under similar incubation conditions (pH 8.0, 30 degrees C), except the latter preferred a higher concentration of pollutants as well as salinity at 30 mM and 35?respectively, while strain H1 grew well on 20 mM at More less

Nahit AKTAŞ

Article | 2021 | Catalysts11 ( 12 )

In this study, novel carbon nanotube-supported Mo (Mo/CNT) catalysts were prepared with the sodium borohydride reduction method for the detection of L-cysteine (L-Cys, L-C). Mo/CNT catalysts were characterized with scanning electron microscopy with elemental dispersion X-ray (EDX-SEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectrometry (UV-vis), temperature-programmed reduction (TPR), temperature programmed oxidation (TPO), and temperature-programmed desorption (TPD) techniques. The results of these advanced surface characterization techniques revealed that the catalysts were prepared successfully. Electrochemical meas . . .urements were employed to construct a voltammetric L-C sensor based on Mo/CNT catalyst by voltammetric techniques such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Further measurements were carried out with electrochemical impedance spectroscopy (EIS). Mo/CNT/GCE exhibited excellent performance for L-C detection with a linear response in the range of 0-150 mu M, with a current sensitivity of 200 mA/mu M cm(2) (0.0142 mu A/mu M), the lowest detection limit of 0.25 mu M, and signal-to-noise ratio (S/N = 3). Interference studies showed that the Mo/CNT/GCE electrode was not affected by D-glucose, uric acid, L-tyrosine, and L-trytophane, commonly interfering organic structures. Natural sample analysis was also accomplished with acetyl L-C. Mo/CNT catalyst is a promising material as a sensor for L-C detection More less