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Nguyen Trung Dung,Nguyen Van Hiep,Manh B. Nguyen,Vu Dinh Thao,Nguyen Nhat Huy 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10
Photocatalysis is usually considered as one of the most effective methods for treating non-biodegradable pollutants commonly found in textile wastewater. In this study, the photocatalyst of g-C3N4/MIL-53(Fe) was synthesized by the hydrothermal method and applied for the removal of Rhodamine B (RhB) in water. The photocatalytic material was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer-Emmett-Teller analysis, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The results showed that the g-C3N4 doped MIL-53(Fe) with 97 wt% of MIL- 53(Fe) works effectively under visible light and the presence of oxidants (Na2S2O8). RhB removal efficiency can be more than 99% with 20mg/L of RhB, 300mg/L of catalyst, 200mg/L of Na2S2O8, and pH 3. In addition, the photocatalytic degradation mechanism of RhB with g-C3N4/MIL-53(Fe) was also proposed, which could be improved and studied for a wide range of applications in textile wastewater treatment.
Xuan Nui Pham,Manh B. Nguyen,Ha Son Ngo,Huan V. Doan 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
In recent decades, highly efficient deep desulfurization processes have become very necessary todecrease environmental pollution due to sulfur emissions from fuels. Herein, an enhanced photocatalyticdesulfurization of a model fuel was investigated under sunlight irradiation using H2O2 as the oxidant andAg@AgBr loaded mesoporous silica Al-SBA-15 as a catalyst. In this study, the photocatalyst (Ag@AgBr/Al-SBA-15) was synthesized via a chemical deposition using halloysite clay as the silica–aluminum sourceand characterized by X-ray diffraction, N2 adsorption, scanning electron microscopy, transmissionelectron microscopy, and UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS). The UV–Vis DRS resultsrevealed that the light absorption expanded to the visible region (l > 400 nm) for the various Ag@AgBrnanoparticles doped in the mesoporous Al-SBA-15 material. The 30% Ag@AgBr/Al-SBA-15 sample with a30% Ag@AgBr doping exhibited enhanced photocatalytic activity and showed high stability even afterfour successive cycles. The results demonstrated that initial dibenzothiophene concentrations (500 ppm)reached 98.66% removal with 50 mg of the catalyst dosage, 1.0 mL of H2O2, for 360 min of sunlightirradiation at 70 C.
Hyperfine structure of Sc@C<sub>82</sub> from ESR and DFT
Morley, G W,Herbert, B J,Lee, S M,Porfyrakis, K,Dennis, T J S,Nguyen-Manh, D,Scipioni, R,van Tol, J,Horsfield, A P,Ardavan, A,Pettifor, D G,Green, J C,Briggs, G A D IOP Pub 2005 Nanotechnology Vol.16 No.11
<P>The electron spin <I>g</I>-?and hyperfine tensors of the endohedral metallofullerene Sc@C<SUB>82</SUB> are anisotropic. Using electron spin resonance (ESR) and density functional theory (DFT), we can relate their principal axes to the coordinate frame of the molecule, finding that the <I>g</I>-tensor is not axially symmetric. The Sc bond with the cage is partly covalent and partly ionic. Most of the electron spin density is distributed around the carbon cage, but 5% is associated with the scandium d<SUB><I>yz</I></SUB> orbital, and this drives the observed anisotropy. </P>