کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7043615 | 1456915 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ethanol enhanced carbon tetrachloride degradation in Fe(II) activated calcium peroxide system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The degradation of carbon tetrachloride (CT) by Fe(II) activated calcium peroxide (CaO2) in the presence of ethanol (CH3CH2OH, EtOH) was investigated. The results showed that CT could be completely degraded in 20â¯min with 3.90â¯mmol Lâ1 CaO2, 5.20â¯mmol Lâ1 Fe(II) and 1.30â¯mmol Lâ1 EtOH in CaO2/Fe(II)/EtOH system. Superoxide radical anion (O2
- â) and hydroxyethyl radical (
- CHCH3OH, HER) were demonstrated as the main radicals for CT degradation which were confirmed by scavenging tests and electron paramagnetic resonance (EPR) detection. The mechanism of CT degradation was mainly due to the split of C-Cl and CT degradation pathway was proposed accordingly. Further investigation suggested that the solution pH in range of 3-5 were favorable to CT degradation. Both Clâ and HCO3â had inhibitive effect on CT removal, while the influence of NO3â and SO42â could be negligible. Moreover, the results of experiments performed using actual groundwater demonstrated that an adverse impact occurred on CT degradation, but this drawback could be overcome by increasing reagent dosages. In summary, CT degradation in Fe(II) activated CaO2 system can be significantly promoted by EtOH addition, and this finding, for the first time, provides an innovative technology for degradation of the highly oxidized organic contaminants.
- â) and hydroxyethyl radical (
- CHCH3OH, HER) were demonstrated as the main radicals for CT degradation which were confirmed by scavenging tests and electron paramagnetic resonance (EPR) detection. The mechanism of CT degradation was mainly due to the split of C-Cl and CT degradation pathway was proposed accordingly. Further investigation suggested that the solution pH in range of 3-5 were favorable to CT degradation. Both Clâ and HCO3â had inhibitive effect on CT removal, while the influence of NO3â and SO42â could be negligible. Moreover, the results of experiments performed using actual groundwater demonstrated that an adverse impact occurred on CT degradation, but this drawback could be overcome by increasing reagent dosages. In summary, CT degradation in Fe(II) activated CaO2 system can be significantly promoted by EtOH addition, and this finding, for the first time, provides an innovative technology for degradation of the highly oxidized organic contaminants.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 205, 31 October 2018, Pages 105-112
Journal: Separation and Purification Technology - Volume 205, 31 October 2018, Pages 105-112
نویسندگان
Ping Tang, Wenchao Jiang, Shuguang Lyu, Zhaofu Qiu, Qian Sui,