Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation

In this study, mesoporous TiO2 with various hydrolysis rates were prepared and combined with H2O2 for the photodegradation of unsymmetrical dimethylhydrazine (UDMH) under VUV irradiation. Results showed that the mesoporous TiO2 synthesized by the hydrolysis in water (MT100) exhibited a good mesoporo...

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Autores principales:	Yuanzheng Huang, Ying Jia, Xiaomeng Lv, Ruomeng Hou, ZhiYong Huang, Yongyong Zhang, Keke Shen, Guofeng Jin, Jun Su, Li'an Hou
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Mesoporous TiO2 Vacuum-ultraviolet Hydrogen peroxide Advanced oxidation process Unsymmetrical dimethylhydrazine Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/235bf6a35a65421b83c1fa1b4876c46b
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spelling	oai:doaj.org-article:235bf6a35a65421b83c1fa1b4876c46b2021-11-04T04:32:07ZDegradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation2238-785410.1016/j.jmrt.2021.10.092https://doaj.org/article/235bf6a35a65421b83c1fa1b4876c46b2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S223878542101228Xhttps://doaj.org/toc/2238-7854In this study, mesoporous TiO2 with various hydrolysis rates were prepared and combined with H2O2 for the photodegradation of unsymmetrical dimethylhydrazine (UDMH) under VUV irradiation. Results showed that the mesoporous TiO2 synthesized by the hydrolysis in water (MT100) exhibited a good mesoporous structure and the largest specific surface area (178.85 m2 g−1). Consequently, MT100 showed the best degradation efficiency, with the rate constant (k) for VUV/MT100 and VUV/MT100/H2O2 of 0.0185 and 0.2595 min−1, respectively, which was 1.4 and 4.0 times of that of P25. The addition of H2O2 significantly enhanced the degradation efficiency by photoactivation of H2O2 and the synergistic effect. The rate constant and the mineralization rate (after a 3-h treatment) increased by 13 and 3.8 times when 40 mM H2O2 was added into VUV/MT100. The weak alkaline condition (pH = 9) would facilitate the degradation of UDMH. The ⋅OH was the key oxidizing species in VUV/MT100/H2O2. Eight intermediates were detected during the degradation and the possible pathways of UDMH degradation in VUV/MT100/H2O2 process were proposed. VUV/MT100/H2O2 provides an efficient method to degrade UDMH.Yuanzheng HuangYing JiaXiaomeng LvRuomeng HouZhiYong HuangYongyong ZhangKeke ShenGuofeng JinJun SuLi'an HouElsevierarticleMesoporous TiO2Vacuum-ultravioletHydrogen peroxideAdvanced oxidation processUnsymmetrical dimethylhydrazineMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 4737-4749 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mesoporous TiO2 Vacuum-ultraviolet Hydrogen peroxide Advanced oxidation process Unsymmetrical dimethylhydrazine Mining engineering. Metallurgy TN1-997
spellingShingle	Mesoporous TiO2 Vacuum-ultraviolet Hydrogen peroxide Advanced oxidation process Unsymmetrical dimethylhydrazine Mining engineering. Metallurgy TN1-997 Yuanzheng Huang Ying Jia Xiaomeng Lv Ruomeng Hou ZhiYong Huang Yongyong Zhang Keke Shen Guofeng Jin Jun Su Li'an Hou Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
description	In this study, mesoporous TiO2 with various hydrolysis rates were prepared and combined with H2O2 for the photodegradation of unsymmetrical dimethylhydrazine (UDMH) under VUV irradiation. Results showed that the mesoporous TiO2 synthesized by the hydrolysis in water (MT100) exhibited a good mesoporous structure and the largest specific surface area (178.85 m2 g−1). Consequently, MT100 showed the best degradation efficiency, with the rate constant (k) for VUV/MT100 and VUV/MT100/H2O2 of 0.0185 and 0.2595 min−1, respectively, which was 1.4 and 4.0 times of that of P25. The addition of H2O2 significantly enhanced the degradation efficiency by photoactivation of H2O2 and the synergistic effect. The rate constant and the mineralization rate (after a 3-h treatment) increased by 13 and 3.8 times when 40 mM H2O2 was added into VUV/MT100. The weak alkaline condition (pH = 9) would facilitate the degradation of UDMH. The ⋅OH was the key oxidizing species in VUV/MT100/H2O2. Eight intermediates were detected during the degradation and the possible pathways of UDMH degradation in VUV/MT100/H2O2 process were proposed. VUV/MT100/H2O2 provides an efficient method to degrade UDMH.
format	article
author	Yuanzheng Huang Ying Jia Xiaomeng Lv Ruomeng Hou ZhiYong Huang Yongyong Zhang Keke Shen Guofeng Jin Jun Su Li'an Hou
author_facet	Yuanzheng Huang Ying Jia Xiaomeng Lv Ruomeng Hou ZhiYong Huang Yongyong Zhang Keke Shen Guofeng Jin Jun Su Li'an Hou
author_sort	Yuanzheng Huang
title	Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
title_short	Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
title_full	Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
title_fullStr	Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
title_full_unstemmed	Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation
title_sort	degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous tio2 and h2o2 under vacuum ultraviolet (vuv) irradiation
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/235bf6a35a65421b83c1fa1b4876c46b
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Degradation of unsymmetrical dimethylhydrazine in water by hybrid mesoporous TiO2 and H2O2 under vacuum ultraviolet (VUV) irradiation

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