Benzotriazoles are a new class of organic emerging pollutants ubiquitously found in the environment. The increase of their concentration to detectable values is the consequence of the inability of the Conventional Waste Water Plants (CWWPs) to abate these products. We subjected 1H-benzotriazole (BTz), tolyltriazole (TTz), and Tinuvin P (TP, a common UV plastic stabilizer) to photocatalytic degradation under UV-irradiated TiO2 in different conditions. The principal photoformed intermediates, the relationship between the degradation rate and the pH, the degree of mineralization, and the fate of the organic nitrogen were investigated. Under the adopted experimental conditions, all the studied substrates were rapidly photocatalytically transformed (the maximum degradation rates for BTz and TTz were (3.88 ± 0.05) × 10–2 and (2.11 ± 0.09) × 10–2 mM min–1, respectively) and mineralized (the mineralization rate for BTz and TTz was 4.0 × 10–3 mM C min–1 for both substrates). Different from the 1,2,4-triazole rings that are not completely mineralized under photocatalytic conditions, 1H-benzotriazole and tolyltriazole were completely mineralized with a mechanism that involved a partial conversion of organic nitrogen to N2. The photocatalytic process activated by UV-irradiated TiO2 is an efficient tool to abate 1H-benzotriazole and its derivatives, avoiding their release in the environment.

Photocatalytic Transformations of 1H-Benzotriazole and Benzotriazole Derivates

Marco Minella;Elisa De Laurentiis;Francesco Pellegrino;Marco Prozzi;Federica Dal Bello;Valter Maurino;Claudio Minero
2020-01-01

Abstract

Benzotriazoles are a new class of organic emerging pollutants ubiquitously found in the environment. The increase of their concentration to detectable values is the consequence of the inability of the Conventional Waste Water Plants (CWWPs) to abate these products. We subjected 1H-benzotriazole (BTz), tolyltriazole (TTz), and Tinuvin P (TP, a common UV plastic stabilizer) to photocatalytic degradation under UV-irradiated TiO2 in different conditions. The principal photoformed intermediates, the relationship between the degradation rate and the pH, the degree of mineralization, and the fate of the organic nitrogen were investigated. Under the adopted experimental conditions, all the studied substrates were rapidly photocatalytically transformed (the maximum degradation rates for BTz and TTz were (3.88 ± 0.05) × 10–2 and (2.11 ± 0.09) × 10–2 mM min–1, respectively) and mineralized (the mineralization rate for BTz and TTz was 4.0 × 10–3 mM C min–1 for both substrates). Different from the 1,2,4-triazole rings that are not completely mineralized under photocatalytic conditions, 1H-benzotriazole and tolyltriazole were completely mineralized with a mechanism that involved a partial conversion of organic nitrogen to N2. The photocatalytic process activated by UV-irradiated TiO2 is an efficient tool to abate 1H-benzotriazole and its derivatives, avoiding their release in the environment.
2020
10
1
15
https://www.mdpi.com/2079-4991/10/9/1835
photocatalysis; 1H-benzotriazole; tolyltriazole; Tinuvin P; emerging pollutants; titanium dioxide
Marco Minella, Elisa De Laurentiis, Francesco Pellegrino, Marco Prozzi, Federica Dal Bello, Valter Maurino, Claudio Minero
File in questo prodotto:
File Dimensione Formato  
nanomaterials-908124_IRIS.docx

Accesso aperto

Descrizione: Articolo in versione finale dell'autore
Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 454.79 kB
Formato Microsoft Word XML
454.79 kB Microsoft Word XML Visualizza/Apri
nanomaterials-908124-supplementary_IRIS.doc

Accesso aperto

Descrizione: SI
Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 982.5 kB
Formato Microsoft Word
982.5 kB Microsoft Word Visualizza/Apri
nanomaterials_2020_10_01835.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 998.01 kB
Formato Adobe PDF
998.01 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1757813
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 7
social impact