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- 검색키워드
- 저자 : Mahdi Rahimi (검색결과 3 건)
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Mahdi Rahimi,Ehsan Salehi,Masoud Mandooie,Nayyereh Khalili 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
For the first time, the ethyl acetate production plant wastewater was treated using a batch adsorption/ozonation integrated process. The wastewater contained alcoholic pollutants (majorly, ethanol) andthe discharge of this wastewater could result in serious risks to the environment. The operational variablesincluding reaction time (10 to 60 min), temperature (20 to 60 C), ozone flowrate (4 to 12 L/min)and granular activated carbon (GAC) dose (5 to 15 g) were optimized by applying response surfacemethodology, where the removal of chemical oxygen demand (COD) was aimed to be maximized asthe target variable. The optimal conditions were obtained at the reaction time of 60 min, temperatureof 60 C, GAC dose of 10 g and ozone flowrate of 8 L/min, which resulted in COD removal of 98.5 %. Characterization analyses revealed that ozonation could support in-situ regeneration of the GAC and providea synergistic effect on the COD removal enhancement. The separation kinetics of the integrated processwas also assessed and found to be superior than those of the standalone operations. Sobol sensitivityanalysis results uncovered that the reaction temperature by 85 % and the binary interaction of the reactiontime and temperature by near 7 % impact shares were the most effective parameters on the CODremoval. Isothermal studies showed that the adsorption of ethanol on GAC is physical, multilayer andheterogeneous. Consequently, the integrated adsorption/ozonation process has been approved as apotential method for the treatment of ethyl acetate plant wastewater.
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Masoud Mandooie,Mahdi Rahimi,Golara Nikravesh,Ehsan Salehi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Urea alcoholysis is one of the environmental-friendly and economic methods for dimethyl carbonate(DMC) production. Various catalysts such as bases, organic tin, acids, ionic liquids and metal oxides havebeen used for synthesis of DMC through urea alcoholysis process. Based on literature survey, catalystscontaining both acidic and basic sites, are more suited for catalyzing the reaction; however, the basicityplays more conspicuous role. Zinc-based mixed metal oxides (MMOs) have emerged as potential catalystsfor this purpose mainly due to the amphoteric nature of ZnO as well as basic/acidic sites abundance. Thisarticle reviews zinc-based MMO catalysts focusing on catalytic performances and mechanisms, synthesizingmethods, characterizations and operating conditions of the reactors during a 20-years period. Literature survey uncovered that pure ZnO catalyst could exhibit a maximum of 37% DMC yield underthe utmost operating conditions. However, zinc-based MMO catalysts (binary or ternary) showed superiorperformance in DMC conversion through the urea alcoholysis process, usually under moderate operatingconditions, mainly due to synergetic effects among metal oxide phases. Among MMO catalysts,ZnO/CaO binary metal oxide and Zn/Ce/La ternary metal oxide catalysts tabulated the highest DMC productionyields of 41.2% and 50.4% respectively. Moreover, two different catalyst-test modes includingbatch and continuous, and three catalyst synthesizing methods including sol–gel, co-precipitation andurea precipitation (UPM) have been spotlighted in this review.
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Abazari Mohammad,Yousefi Mahdi,Rahimi Vafa Baradaran,Vahid Hamideh,Saki Azadeh,Gholoobi Arash 대한약침학회 2022 Journal of pharmacopuncture Vol.25 No.3
Objectives: Routine therapies cannot control refractory stable angina, leading to a high economic burden and an impaired quality of life. Persian medicine incorporates exceptional attention to lifestyle and nutrition to prevent and treat various diseases. Previous studies have reported the analgesic and anti-inflammatory effects of wet cupping. The present study aims to determine the effects of nutrition and cupping on refractory stable angina patients. Methods: Forty male patients with refractory stable angina were randomly allocated to four groups, including nutrition modification based on Persian medicine, wet cupping, nutrition modification along with wet cupping, and control. The primary outcomes were the changes in pain score using a visual analog scale and quality of life using the Seattle angina questionnaire. The secondary outcomes were changes in the exercise test and blood pressure. Results: The results of the present study revealed that 30 days of treatment with nutrition modification based on Persian medicine, cupping, and modified nutrition and cupping along with standard treatment for stable angina significantly increased the patient’s quality of life and exercise test results while reducing pain, and systolic and diastolic blood pressure. Conclusion: Applying complementary Persian medicine methods such as nutrition modification and cupping along with the classical medical treatments may improve outcomes for refractory stable angina patients.
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