Synthesis and Characterization of Photocatalytic Performance of Rutial-TiO2 Nanorod Arrays for Solar Hydrogen Generation
2nd international scientific conference,zakho
Single crystalline rutile TiO2 nanorod (TNRs) films have been grown on the fluorine doped tin oxide (FTO) substrates using a one pot hydrothermal method, have attracted great attention because of favorable applications in the photo electrochemical water splitting system. The effect of the reaction conditions on the morphology, crystal orientation and Photocatalytic activity has been systematically investigated. The X-ray diffraction (XRD) pattern shows that two diffraction peaks at 36.3° and 63.2° correspond to the (101) and (002) planes of the tetragonal rutile TiO2 nanorod, respectively. The scanning electron microscope (SEM) of the samples indicates that the TiO2 array surface morphology and orientation are highly dependent on the reaction parameters, such as temperature, reaction time and the titanium precursor concentration. In a typical condition of the hydrothermal method at 0.3ml of TBO and 160°C for 3 h, a small diameter and short length 190nm and 2.2 µm of TiO2 nanorod respectively are grown on FTO substrate. When synthesized TiO2 nanorod photocatalyst was irradiated under illumination of simulated AM 1.5G solar light (100 mW cm−2) achieves an overall Photocurrent density of 1.80 mA/cm2 with a maximum photoconversion efficiency of ~1.4%. The results suggest that these dense and aligned one-dimensional TiO2 nanorod are promising for hydrogen generation from water splitting based on PEC cells.
KINETIC STUDY OF ADSORPTION OF HEXAVALENT CHROMIUM IN AQUEOUS SOLUTION USING BAY LEAF (LAURUS NOBILIS) AS NEW BIO-ADSORBENT
international conference on advanced science and engineering
_ Laurus nobilis (Bay leaf), was examined for its capacity to remove hexavalent chromium Cr(VI) poisonous, from aqueous solution. The bio-adsorbent using bay leaf obtained from Laurus nobilis was investigated in batch experiments. The influence of main parameters such as chromium concentration, pH and shaking time are tests. The effect of beginning concentration of Cr(VI) ion (10 to 50 mg/dm ), pH (1 to 6) and shaking time (5 to 180 min) have been reported. The optimum pH was found to be pH 4.. Results show that the most appropriate model was pseudo second-order kinetic and it correlate with the trial statistics well.
Enhanced Photoelectrochemical Water Splitting of Hydrothermally- Grown ZnO and Yttrium-doped ZnO NR Arrays
1ST International Conference on Materials Engineering & Science (IConMEAS 2018)
Abstract. Undoped and Y doped ZnO nanorods (YZO NRs) were prepared by hydrothermal method. The as-prepared ZnO and YZO NRs with different Y/Zn molar ratios were used as anodes for electrochemical water splitting. Then, photoelectrochemical (PEC) water splitting performances of YZO NRs were tested. When compared with pristine ZnO NRs, the photocurrent density generated with yttrium doped zinc oxide NR as electrode was higher(1.2 mA cm-2 ) than that obtained with pristine ZnO NRs (0.25 mA cm-2), at 0.2 V vs. Ag/ AgCl using samples of 1.2 mol % of yttrium. This performance corresponds to calculated photoconversion efficiency of 0.40%, at a low potential (-0.38V vs Ag/AgCl) of the non-doped ZnO NR film.