Research data for "Photocatalysis using Zinc Oxide-Zinc Phthalocyanine Composite for Effective Mineralization of Organic Pollutants"

Published: 25 June 2021| Version 1 | DOI: 10.17632/tftycyf7ws.1
Contributors:
Aba Akebi Atta- Eyison,
,

Description

The dataset is in tables and shows the various experimental tests performed to ascertain the effectiveness of Zinc oxide-Zinc Phthalocyanine composite for the degradation of organic pollutants such as dyes under photocatalysis. Table 1 shows UV-Vis absorbance spectra data of synthesized unsubstituted zinc phthalocyanine sample. Peaks obtained from data indicates a characteristic ZnPc absorbance per literature. Table 2 is an XRD data for ZnO at a range of 20°-70°. Diffraction peaks obtained from data matched that of ZnO. Table 3 shows XRD data for Synthesized unsubstituted ZnPc obtained at 2.5°-40°. Data shows sharp peaks which relate to literature. An XRD data of various synthesized ZnO-ZnPc composites with varying amount of ZnPc is captured in Table 4. Data was obtained between 20°-80°. The obtained data had peaks corresponding to some peaks obtained for ZnO and ZnPc. Table 5 shows UV-Vis spectra data obtained from the singlet oxygen generation test to ascertain the stability of ZnPc.The data obtained suggested that the phthalocyanine was not degraded. Data on various scavengers effect on degradation of the pollutant in the presence of ZnO at 20 min irradiation time interval to identify which reactive species plays a major role in the mineralization process is shown in Table 6. Data obtained for isopropanol (OH• scavenger) shows the least dye degradation. This indicated that the hydroxyl radical (OH•) is the main reactive species during the photocatalytic degradation of the dye. Table 7 is a UV-Vis spectra data showing degradation of the dye luminescence peak at 600 nm for the sample containing ZnO and terephthalic acid (TPA) under irradiation to ascertain the formation of OH• free radicals. This data confirms the formation of OH•. Data on percentage degradation of C. I. Reactive Blue 194 with time under various irradiation conditions with a dye concentration of 40 mg/L and ZnO-ZnPc composite loading of 0.005 g/L at a Solution pH = 7.2 is seen in Table 8. Data on the Solar/ZnO-ZnPc composite condition showed the highest degradation efficiency values. Table 9 shows data on the Effect of ZnO-ZnPc composites with varying amount of ZnPc on mineralization of C. I. Reactive Blue 194. Data shows that increasing the ZnPc amount for composite formation increases photocatalytic activity. Table 10 is data on the effect of C. I. Reactive Blue 194 concentration on degradation percentage with ZnO-ZnPc Loading of 0.005 g/L at pH of 7.2. data shows that high dye concentrations will demand higher catalytic dosage.

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Various reagents, instruments and protocols were used to arrive at the dataset. Table 1, showing data on UV-Vis absorbance spectra of zinc phthalocyanine sample dissolved in DMSO, were obtained at room temperature using JENWAY 7315 Spectrophotometer. XRD analysis data for ZnO, ZnPc and the various prepared ZnO-ZnPc composites were obtained using Empyrean X-ray Diffractometer. ZnO, synthesized ZnPc and the various ZnO-ZnPC composite were packed tightly into the sample holder and scanned at the range of 2.5°- 80° in 2θ geometry using Cu-Kα radiation at 45 kV 20 mA. The UV-Vis spectra data obtained for the singlet oxygen generation test inTable 5 to ascertain the stability of ZnPc was acquired by adding a solution of diphenylisobenzofuran (DPBF) to zinc phthalocyanine and irradiating under visible light at 2 min interval. The DPBF was used as a singlet oxygen quencher and its conversion by the singlet oxygen monitored by UV-Visible spectroscopy. Data on the absence and presence of various scavengers on the degradation of the pollutant in Table 6 was obtained by the addition of the various scavengers in the presence of ZnO at 20 min irradiation time interval to identify which reactive species plays a major role in the mineralization process. The UV-Vis spectra data in Table 7 was acquired by measuring the luminescence peak of degraded dye samples at 600 nm obtained by irradiating samples with ZnO and terephthalic acid (TPA) at 30, 60, 90 and 120 min. The formation of OH• free radicals is determined by the addition of TPA as a probe molecule to sample solution with ZnO. The TPA is known to react with OH• free radicals to yield 2-hydroxyterphthalic acid. All degradation experimental data seen in Table 8, Table 9 and Table 10 were obtained by continual agitation of sample solutions under solar irradiation or UV-Vis irradiation at specific time intervals. 5mL from sample solutions was collected at these intervals for spectrophotometric analysis. Solar mineralization experiment was conducted at an intensity of 20000 lux. The UV-Vis experiment was carried out using the Chromato-Vue cabinet C-70G system at a long UV wave of 365nm. The optimum condition for degradation experiments includes dye concentration of 40 mg/L, ZnO-ZnPc composite loading of 0.005 g/L and a Solution pH of 7.2.