scholarly journals Photocatalytic Degradation of Some Polyolefin-TiO2 Composites Evaluated by Molecular Spectroscopy

2019 ◽  
Vol 56 (1) ◽  
pp. 92-96
Author(s):  
Valentin Raditoiu ◽  
Alina Raditoiu ◽  
Monica Florentina Raduly ◽  
Luminita Eugenia Wagner
Keyword(s):  
Ir Spectra ◽  
Photocatalytic Degradation ◽  
Molecular Spectroscopy ◽  
Degradation Products ◽  
Composite Films ◽  
Direct Connection ◽  
Photochemical Degradation ◽  
Polypropylene Composite ◽  
Photolytic Decomposition

The photochemical degradation of polyolefin-TiO2 composite films was investigated and described in relationship with the concentration of photocatalyst and after different exposure times. UV-Vis-NIR and IR spectra reveal the presence of various degradation products, which are in direct connection with the photodecomposition mechanism. Various ratios between the absorbance of some typical IR characteristic bands can lead to the evaluation of photocomposition of polyethylene and polypropylene composite films containing TiO2 nanoparticles.The results show that the photocatalytic degradation of composites is significantly faster than the simple photolytic decomposition of pure polypropylene and polyethylene and could be used as a solution for the destruction of this type of wastes.

scholarly journals A study of photocatalytic degradation of methomyl and its commercial product Lannate-90

2020 ◽  
Vol 26 (3) ◽  
pp. 237-247
Author(s):  
Andjelka Tomasevic ◽  
Aleksandar Marinkovic ◽  
Dusan Mijin ◽  
Marina Radisic ◽  
Slavica Porobic ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
High Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Degradation Products ◽  
Aqueous Suspension ◽  
Commercial Product ◽  
Photochemical Degradation ◽  
Liquid Chromatography Tandem Mass ◽  
The Stability ◽  
The Impact

Photocatalytic degradation of the carbamate insecticide methomyl and its commercial product Lannate-90 in aqueous suspension of TiO2 and ZnO using an Osram ultra-vitalux' lamp (315-400 nm) was investigated. The objective of the investigation was to study and compare the rates of photochemical degradation of the pure active compound and its formulated product in order to find out the impact of inert ingredients on degradation processes. The photochemical degradation of pure methomyl was found to be slower than the degradation of its commercial product Lannate-90. Photodegradation was investigated by UV-Vis spectrometry and HPLC, while mineralization was monitored using IC and TOC analyses. Light absorption capabilities of catalysts were characterized by ultraviolet-visible diffuse reflectance spectroscopy method, while the stability of catalysts was studied by infrared analyses. Degradation products of methomyl and its formulated product were identified by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) results and tentative photodegradation pathways were proposed.

scholarly journals Characterization of pure and silver exchanged natural zeolite filled polypropylene composite films

2005 ◽  
Vol 65 (13) ◽  
pp. 2049-2058 ◽  
Author(s):  
H. Pehlivan ◽  
D. Balköse ◽  
S. Ülkü ◽  
F. Tihminliogˇlu
Keyword(s):  
Natural Zeolite ◽  
Composite Films ◽  
Polypropylene Composite

Photocatalytic degradation of Congo Red by hydrothermally synthesized nanocrystalline TiO2 and identification of degradation products by LC–MS

2008 ◽  
Vol 155 (3) ◽  
pp. 469-476 ◽  
Author(s):  
Sema Erdemoğlu ◽  
Songül Karaaslan Aksu ◽  
Funda Sayılkan ◽  
Belgin İzgi ◽  
Meltem Asiltürk ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Congo Red ◽  
Degradation Products ◽  
Nanocrystalline Tio2

Mesoporous TiO2/graphene composite films for the photocatalytic degradation of eco-persistent pollutants

2017 ◽  
Author(s):  
Yuly Kusumawati ◽  
Thierry Pauporté ◽  
Bruno Viana ◽  
Radek Zouzelka ◽  
Monika Remzova ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Composite Films ◽  
Mesoporous Tio2 ◽  
Graphene Composite ◽  
Persistent Pollutants

Development of HPLC/ESI-MS and HPLC/1H NMR Methods for the Identification of Photocatalytic Degradation Products of Iodosulfuron

2006 ◽  
Vol 78 (9) ◽  
pp. 2957-2966 ◽  
Author(s):  
Mohamad Sleiman ◽  
Corinne Ferronato ◽  
Bernard Fenet ◽  
Robert Baudot ◽  
Farouk Jaber ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
1H Nmr ◽  
Degradation Products ◽  
Esi Ms ◽  
Nmr Methods

Synthesis and Dye Degradation Properties of Cu2+ Complexes with Benzimidazole Derivatives

2013 ◽  
Vol 726-731 ◽  
pp. 2449-2452 ◽  
Author(s):  
Yin Zhi Jiang ◽  
Yong Qiang Shi ◽  
Lian Zhu Tian ◽  
Huo Ying Xu
Keyword(s):  
Methyl Orange ◽  
Ir Spectra ◽  
Dye Degradation ◽  
Degradation Products ◽  
Hplc Method ◽  
Uv Spectra ◽  
Benzimidazole Derivatives ◽  
Coordination Sites ◽  
Degradation Properties ◽  
Degradation Of Methyl Orange

Six benzimidazole derivatives were synthesized and charactrized by IR spectra, 1H-NMR spectra and MS spectra. The coordination reaction of the derivatives with CuCl2. And six novel Cu (II) complexes with the derivatives were prepared and characterized by UV spectra, IR spectra and elemental analysis. The catalytic degradation of methyl orange aqueous solution was investigated using the complexes as catalysis in presence H2O2 by HPLC method and Vis-spectrophotometry. The result of characterization showed that there are four coordination sites around Cu (II) in all complexes, which are respectively occupied by one sulfur atom (from the derivative), one nitrogen atom (from the derivative), one oxygen atom ( from the OH-) and one chlor atom (from the Cl-). The degradation of methyl orange indicated that all the complexes show the properties of enzyme activity. And the main degradation products determined were hydroquinone and maleic acid.

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