| Autor: |
Elsayed MS; Central Laboratory of Date Palm Research and Development, Agricultural Research Center, Giza 12619, Egypt., Ahmed IA; Department of Chemistry, Faculty of Science, King Khalid University, Abha 62224, Saudi Arabia., Bader DMD; Department of Chemistry, Faculty of Science, King Khalid University, Abha 62224, Saudi Arabia., Hassan AF; Chemistry Department, Faculty of Science, Damanhour University, Damanhour 22511, Egypt. |
| Jazyk: |
angličtina |
| Zdroj: |
Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2021 Dec 24; Vol. 12 (1). Date of Electronic Publication: 2021 Dec 24. |
| DOI: |
10.3390/nano12010049 |
| Abstrakt: |
In this study, zinc oxide nanoparticles (ZnO) and nanohydroxyapatite (NHAP) were prepared in the presence of date palm pits extract (DPPE) and eggshells, respectively. Another four nanocomposites were prepared from ZnO and NHAP in different ratios (ZP13, ZP14, ZP15, and ZP16). DPPE and all nanomaterials were characterized using GC-MS, zeta potentials, particle size distributions, XRD, TEM, EDX, FTIR, and pH PZC . The characterization techniques confirmed the good distribution of ZnO nanoparticles on the surface of NHAP in the prepared composites. Particles were found to be in the size range of 42.3-66.1 nm. The DPPE analysis confirmed the presence of various natural chemical compounds which act as capping agents for nanoparticles. All the prepared samples were applied in the adsorption and photocatalytic degradation of methylene blue under different conditions. ZP14 exhibited the maximum adsorption capacity (596.1 mg/g) at pH 8, with 1.8 g/L as the adsorbent dosage, after 24 h of shaking time, and the static adsorption kinetic process followed a PSO kinetic model. The photocatalytic activity of ZP14 reached 91% after 100 min of illumination at a lower MB concentration (20 mg/L), at pH 8, using 1.5 g/L as the photocatalyst dosage, at 25 °C. The photocatalytic degradation of MB obeyed the Langmuir-Hinshelwood first-order kinetic model, and the photocatalyst reusability exhibited a slight loss in activity (~4%) after five cycles of application. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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