辐照处理水溶液中的苯胺

Li Jia-tong, Lin Yong-sheng, Shan Qing, He Da-qian, Zhao Dan, Jia Wen-bao
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引用次数: 4

摘要

摘要:本文研究了伽玛辐照对苯胺的辐照降解。在研究过程中,若干苯胺浓度分别为25、50、75、100和200 mg/L的水溶液样品在核心通道处分别用60Co源照射5、10、15、20、25和30小时,吸收剂量率为0.78 kGy/h。测试结束后,项目作者仔细检查了水样品,通过分析pH值、羟基自由基和单个初始浓度的H2O2来确定照射的影响。研究结果表明,伽马辐射可以有效地去除水溶液中的苯胺,并在此过程中倾向于去除化学需氧量(COD)。除其他发现外,测试显示,在25毫克/升的苯胺浓度下,仅暴露5小时后,就可以100%去除苯胺。作者解释说,动力学研究表明,苯胺的降解遵循伪一级反应。他们还表明pH对苯胺的去除效率起着重要的作用。本研究的试验结果表明,在7.8 kGy的剂量下,碱性环境对COD的去除率高于酸性环境。随着吸收剂量的增加,酸性环境有利于COD的去除。他们还发现,添加50 g/L的碳酸氢钠作为羟基自由基清除剂,在吸收剂量为23.4 kGy时,COD的去除率降低了8%。这表明在伽马辐照过程中使用羟基自由基的重要性。此外,添加1 g/L H2O2可将COD去除率从31%提高到55%。这一百分点的跳跃表明在使用伽马辐照方面具有协同效应。作者还通过GC/MS鉴定了几种主要的分解产物,这些产物可用于伽马辐照过程中苯胺的辐射诱导降解。最后,他们提出了成功分解苯胺的可能途径。
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The treatment of aniline in aqueous solutions by gamma irradiation
Abstract A laboratory investigation of the radiation-induced degradation of aniline by gamma irradiation is the subject of this paper. During the inquiry, several aqueous samples with aniline concentrations of 25, 50, 75, 100 and 200 mg/L were irradiated for 5, 10, 15, 20, 25 and 30 h, respectively, by a 60Co source with an absorbed dose rate of 0.78 kGy/h at the core channel. After the testing, the project authors scrutinized the aqueous samples to determine the effects of their irradiation by analyzing the pH, the hydroxyl radical and the H2O2 of the individual initial concentrations. The findings showed that gamma irradiation is effective in removing aniline from aqueous solutions and, in the process, tends to remove the chemical oxygen demand (COD). Among other findings, the tests revealed that at a 25 mg/L aniline concentration, up to 100 % removal is possible after only 5 h of exposure. The authors explained that kinetic studies have shown that the degradation of aniline follows a pseudo first-order reaction. They have also shown that pH plays a significant role in aniline-removal efficiency. The tests in this study revealed that with a dose of 7.8 kGy, the removal efficiency of COD in an alkaline environment is higher than that of an acidic environment. With the absorbed dose increases, the authors learned that an acidic environment is helpful for the removal efficiency of COD. They also found that by adding 50 g/L of sodium bicarbonate as the hydroxyl radical scavenger, there was an 8 % decrease in the removal efficiency of COD at the absorbed dose of 23.4 kGy. This indicates the importance of using a hydroxyl radical in the gamma irradiation process. Also, a 1 g/L H2O2 addition increases the COD removal rate from 31 % to 55 %. This percentage-point jump shows a synergistic effect in the use of gamma irradiation. The authors also identified several major decomposition products by GC/MS which are useful in the radiation-induced degradation of aniline by gamma irradiation process. Finally, they present proposals of possible pathways for successful aniline decomposition.
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来源期刊
CiteScore
0.88
自引率
0.00%
发文量
0
审稿时长
1 months
期刊介绍: The Journal of advanced oxidation technologies (AOTs) has been providing an international forum that accepts papers describing basic research and practical applications of these technologies. The Journal has been publishing articles in the form of critical reviews and research papers focused on the science and engineering of AOTs for water, air and soil treatment. Due to the enormous progress in the applications of various chemical and bio-oxidation and reduction processes, the scope of the Journal is now expanded to include submission in these areas so that high quality submission from industry would also be considered for publication. Specifically, the Journal is soliciting submission in the following areas (alphabetical order): -Advanced Oxidation Nanotechnologies -Bio-Oxidation and Reduction Processes -Catalytic Oxidation -Chemical Oxidation and Reduction Processes -Electrochemical Oxidation -Electrohydraulic Discharge, Cavitation & Sonolysis -Electron Beam & Gamma Irradiation -New Photocatalytic Materials and processes -Non-Thermal Plasma -Ozone-based AOTs -Photochemical Degradation Processes -Sub- and Supercritical Water Oxidation -TiO2 Photocatalytic Redox Processes -UV- and Solar Light-based AOTs -Water-Energy (and Food) Nexus of AOTs
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