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A ZnO@ABS/TPU/CaSiO₃ 3D skeleton and its adsorption/photocatalysis properties for dye contaminant removal.

ABSTRACT: Both adsorption and photocatalysis are considered to be effective methods for removing organic contaminants from dye wastewater. In this study, the construction of 3D skeletons based on the nanoparticles ZnO and ABS/TPU/calcium silicate (CaSiO₃) (shortened as ATC) were fabricated via fused deposition molding (FDM) technology. Characterization by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) depicted that ZnO nanospheres had been successfully grown on the 3D skeleton surface with an enlarged specific surface area. As the results of the RhB adsorption and photocatalytic degradation experiments showed, the removal ratio of RhB onto the ZnO-ATC skeleton was as high as 97.94% and the synergistic effect of adsorption and photocatalysis greatly shortened the RhB degradation time under ultraviolet light irradiation. The nanocomposites synthesized in this study showed a significant removal ability for organic pollutants, and could effectively overcome the limitation of the secondary removal of photocatalysts.

SUBMITTER: Zhang M

PROVIDER: S-EPMC9057789 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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A ZnO@ABS/TPU/CaSiO3 3D skeleton and its adsorption/photocatalysis properties for dye contaminant removal.

Zhang Mengli M Xia Xinshu X Cao Changlin C Xue Hun H Yang Yujin Y Li Wei W Chen Qinghua Q Xiao Liren L Qian Qingrong Q

RSC advances 20201111 68

Both adsorption and photocatalysis are considered to be effective methods for removing organic contaminants from dye wastewater. In this study, the construction of 3D skeletons based on the nanoparticles ZnO and ABS/TPU/calcium silicate (CaSiO3) (shortened as ATC) were fabricated via fused deposition molding (FDM) technology. Characterization by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy ...[more]

PMID: 35516567

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Project description:In the present work, a comparative study on eco-friendly synthesis of zinc oxide (ZnO) sample 1 and sample 2 with 3.17 and 4.17 M NaOH, respectively, is reported. Sample 2 with 4.17 M NaOH is applied in the photocatalytic degradation of paracetamol (pure and raw both) using the ultraviolet (UV, 280-400 nm) and UV/H2O2 reaction systems. Pure paracetamol (PCM1) and raw paracetamol (PCM2) from tablets are used for photocatalytic degradation by photocatalysis. Our experimental evidence show that ZnO sample 2 was more active in the UV/H2O2 reaction system than under ultraviolet (UV, 280-400 nm) irradiation only in the photocatalytic degradation process. Field emission scanning electron microscopy (FE-SEM) confirms the homogeneous growth of a rod-like structure for sample 1 and brittle and randomly aggregated rod-like and wire-like nanostructures for sample 2. The peaks observed in the region around 440 to 900 cm-1 in the FTIR spectra for sample 1 and sample 2 annealed at 250 °C confirms the presence of ZnO bonds. UV absorption spectroscopy indicates a red shift in the absorption spectra due to the increase in the molar concentration of NaOH to 4.17 M for sample 2. In this study, the band gap values are found to be 3.33 and 3.01 eV for the synthesized ZnO sample 1 and sample 2, respectively, which are 40 and 360 meV less as compared to that of bulk ZnO (3.37 eV). The oxidation rate is increased in the UV/H2O2 reaction system, producing the highest rate for PCM1 drug removal with rate constant 9.7 × 10-3 min-1 and half-life 71.5 min. The kinetic study results for the removal of PCM1 and PCM2 show good results and follow the pseudo-first-order kinetic model with correlation coefficients 0.69556 and 0.90851, respectively, whereas PCM2 follows the pseudo-second-order kinetic model with correlation coefficient 0.9993. The experimental and calculated values of removal capacity (q e) at equilibrium is found close to those of the pseudo-second order kinetic model for the removal of both the paracetamol forms PCM1 and PCM2 with the catalyst ZnO nanostructure. The photostability of ZnO sample 2 is also tested with a reusability test in photocatalytic degradation of paracetamol at least four times. The absence of a maxima peak at 243 of PCM1 in the UV/H2O2 reaction system indicates nearly 100% successful conversion of 20 ppm PCM1 by using synthesized catalyst ZnO sample 2. The comparative results of both reaction systems, i.e., UV and UV/H2O2, show that the hydroxyl radicals, as the active species, are responsible for major degradation of both paracetamol forms (PCM1 and PCM2).

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Dataset Information

A ZnO@ABS/TPU/CaSiO₃ 3D skeleton and its adsorption/photocatalysis properties for dye contaminant removal.

Publications

A ZnO@ABS/TPU/CaSiO<sub>3</sub> 3D skeleton and its adsorption/photocatalysis properties for dye contaminant removal.

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