کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230113 1427373 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improvement of spent activated carbon regeneration by wet oxidation processes
ترجمه فارسی عنوان
بهبود بازسازی کربن فعال مصرف شده توسط فرایندهای اکسیداسیون مرطوب
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• PNP oxidation occurs via an initial induction period, followed by a fast oxidation.
• The whole process was simulated with COMSOL, as a free radical mechanism.
• WOR results cannot be described as the sum of PNP desorption and later oxidation.
• The process kinetics were studied and characteristical parameters were determined
• AC catalyzes the PNP oxidation, decreasing the Ea which initiates the process.
• WOR allows to restore the AC porosity with values of RE up to 87%.

Activated carbons saturated with p-nitrophenol were regenerated under subcritical conditions by means of wet oxidation, analyzing the effect of temperature (160–200 °C) and oxygen partial pressure (3–12 bar). The research intended to achieve two main objectives: (a) to restore the carbons adsorption performance and (b) to get insight about the p-nitrophenol oxidation process and how it can be influenced by the presence of the adsorbent.Based on the contaminant oxidation mechanisms, which was defined as a series of radical processes, a kinetic model was developed. The model was created by COMSOL MULTIPHYSICS software, and allowed obtaining characteristical parameters. Further comparison between theoretical and experimental results showed the suitability of the model in the whole range of experimental domain. Subsequent application of this model to regeneration experiments confirmed the need of developing a new model in the latter case, since the presence of carbon involved a significant modification of kinetic parameters, which was related to the catalyzing action of the adsorbent.It was also found that both temperature and pressure affect the p-nitrophenol degradation process as well as porosity regain of the carbons. Values of p-nitrophenol regeneration efficiency up to 87% for the highest values of temperature and oxygen partial pressure.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 104, September 2015, Pages 94–103
نویسندگان
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