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- 저자 : Mehralian Mohammad (검색결과 3 건)
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Polystyrene derivative-blended nanocomposite membranes for pervaporation dehydration of hydrazine
Seyed Saeid Hosseini,Ehsan Mehralian,Mohammad Hossein Ekbatan,Pei Li 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3
Hydrazine is an inorganic chemical that has found use in various applications, such as fuel for jets, rockets, missiles and space shuttles. In the present study, polystyrene (PS) based membranes were developed and explored for hydrazine dehydration by pervaporation process. In addition to the separation performance, the physiochemical and morphological characteristics of the membranes were assessed and correlated to the findings. Investigation of the effects of structural and operating parameters revealed that increase in the membrane thickness enhanced selectivity and separation index (PSI) to 18.79 and 61, respectively. In addition, raising feed temperature from 36 o C to 56 o C caused increments in membrane flux, selectivity and PSI. However, increasing feed flow rate only improved water flux. Membranes exhibited reasonable flux and separation performance for the wide range of studied feed compositions. Two modification methods were employed to tailor the characteristics of PS membranes. Blending PS with acrylonitrile butadiene styrene (ABS) led to 27% improvement in total flux while selectivity and PSI reached to as high as 14.3 and 104.6, respectively. Also, nanocomposite membranes containing 2 wt% TiO2 exhibited total flux of 30.9 (g/m2 ·h) and PSI of 175.9.
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Moslemi Faeze,Ehrampoush Mohammad Hassan,Mehralian Mohammad,Dalvand Arash 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
This study evaluated the efficiency of the heterogeneous Fenton process using magnetic activated carbon catalyst produced from date palm waste in removing direct dye from aqueous solutions. The experimental runs and optimal conditions for the effect of contact time, solution pH, catalyst dose, and persulfate dose were determined based on the Box-Behnken design under response surface methodology (RSM). FTIR, FESEM, XRD, EDS, BET, and VSM analyses were used to investigate the characteristics of the catalyst. The analysis of variance (ANOVA) verified that the selected statistical model with R2 0.95, p-value<0.0001, and F-value 58.67 was significant. The results of optimal conditions showed that at a dye concentration of 50 mg/L, catalyst dose 0.96 g/L, persulfate dose 9.7 mM, pH 7 and contact time 84 min, maximum removal efficiency of DR80, DB80, DBw103 and COD was 92.69, 97.07, 73.85, and 60%, respectively. After five cycles of catalyst regeneration, the results showed that the catalyst could be utilized several times effectively for dye removal.
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Mojtaba Pourakbar,Farshid Ghanbari,Amir Hossein Cheshme Khavar,Maryam Khashij,Mohammad Mehralian,Ali Behnami,Mohammad Satari,Mostafa Mahdaviapour,Ali Oghazyan,Ehsan Aghayani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
The present study comprehensively investigated the degradation of naproxen (NPX) using UV/O3/peroxymonosulfate (PMS), UV/O3, UV/PMS, and O3/PMS processes. The effects of various parameters such as PMS and ozone dosage, pH, and NPX concentration were investigated on process performance. Scavenging tests were conducted to identify the dominant radical species. The results under the optimal conditions show that the UV/O3/PMS process is highly efficient for NPX degradation within 30 min of reaction time. Synergy index was also calculated and it was found that ozonation of the UV/PMS process leads to higher removal efficiency and a synergy effect of about 25% was calculated. It was also found that after complete destruction of NPX molecules, 76.9% of TOC was also removed. The final degradation by-products was tracked and it was proved that hydroxylation and decarboxylation were the main pathways in NPX degradation in the UV/O3/PMS reactor. It was also proved that •OH was the main oxidizing agent in the UV/O3/PMS and accordingly the degradation mechanism of NPX was suggested. Cytotoxicity assessment of the process effluent indicated a noticeable reduction in the toxicity of the NPX-laden solution after treatment using UV/ O3/PMS process. Furthermore, cost analysis of the different oxidation processes for real wastewater indicated that UV/ O3/PMS is the most cost-effective process compared to that of other processes (112US$/m3). Accordingly, it can be put forth that the UV/O3/PMS process is a promising and reliable process for the degradation of naproxen.
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