Radiation-induced catalytic degradation of p-nitrophenol (PNP) in the presence of TiO2 nanoparticles |
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| Authors: | Yu Shaoqing Hu Jun Wang Jianlong |
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| Institution: | 1. Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China;2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China;3. Institute of Environmental Engineering, RWTH Aachen University, Aachen, Germany;1. Institute for Energy Security and Environmental Safety, Centre for Energy Research, Hungarian Academy of Sciences, Konkoly Thege Miklós út 29-33, H-1121 Budapest, Hungary;2. South-Pest Wastewater Treatment Plant, Medd?hányó utca 1, H-1238 Budapest, Hungary;1. State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No. 73 Huanghe Street, Nangang District, Harbin 150090, China;2. College of Resource and Environment, Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, No. 700 Changcheng Road, Chengyang District, Qingdao 266109, China;1. School of Environment, Tsinghua University, Beijing 100084, China;2. School of Chemical Engineering and Technology, Harbin Institute of Technology, 92 West Da-Zhi Street, Harbin 150001, China;3. Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University, ?lechtitel? 27, 783 71 Olomouc, Czech Republic |
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| Abstract: | The gamma radiation induced catalytic degradation of p-nitrophenol (PNP) in the presence of titanium dioxide (TiO2) nanoparticles in aqueous solution was investigated. The initial concentration of PNP solution was 50 mg/L, and the additional TiO2 doses were 0, 0.5, 1.0, and 2.0 g/L. The experimental results indicated that the PNP decomposition kinetics conformed to the modified pseudo-first order reaction equation under all applied conditions. When the TiO2 dose was in the range of 0–2.0 g/L, the effect of additional TiO2 on PNP decomposition rate was not obvious because PNP could be removed quite well by irradiation even in the absence of TiO2 nanoparticles; however, the removal of total organic carbon (TOC) and total nitrogen (TN) was significantly accelerated in the presence of TiO2 nanoparticles, the TOC removal efficiency increased from about 16% to 42%, and therefore the mineralization of PNP could be enhanced by TiO2 nanoparticles. The inorganic nitrogen products were quantitatively measured to estimate the decomposition degree of PNP. The major aromatic intermediates, as well as carboxylic acids were identified by LCMS and IC. Possible reactions involved in radiation induced catalytic decomposition of PNP in aqueous solutions were proposed. |
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