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RISS 인기검색어
- 검색키워드
- 저자 : Shirzad Gholami (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Application of Ni-doped ZnO rods for the degradation of an azo dye from aqueous solutions
Mehdi Shirzad-Siboni,Mitra Gholami,Jae-Kyu Yang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Ni-doped ZnO rods were applied as a photocatalyst for the degradation of an azo dye (Reactive Black 5). Effects of solution pH, catalyst dosage, initial RB5 concentration, H2O2 concentration, different purging gases, and type of organic compounds on the removal efficiency of RB5 were studied. Ni-doped ZnO rods were synthesized by co-precipitation method. Neutral pH was selected as an optimal pH condition due to a photo-corrosion of ZnO in acidic and basic conditions. Photocatalytic degradation efficiency of RB5 was increased as the catalyst dosage increased up to 1 g/ L, while it was decreased by increasing initial RB5 concentration. Pseudo-first-order rate constant (kobs) decreased from 0.122 to 0.0051 min−1 and electrical energy per order (EEo) increased from 39.34 to 941.18 (kWh/m3) by increasing RB5 concentration from 5 to 100mg/L, respectively. Photocatalytic degradation efficiency of RB5 increased by increasing H2O2 concentration, but this trend was not observed above 10 mM. Photocatalytic degradation efficiency of RB5 increased in the presence of folic acid and citric acid while interference was observed in the presence of humic acid, EDTA, oxalic acid, and phenol. Photocatalytic activity was maintained even after five successive cycles.
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Photocatalytic reduction of hexavalent chromium with illuminated ZnO/TiO2 composite
Mohammad Naimi-Joubani,Mehdi Shirzad-Siboni,양재규,Mitra Gholami,Mahdi Farzadkia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
The purpose of this work was to investigate the photocatalytic reduction of Cr(VI) with illuminated ZnO/TiO2 composite at various catalyst dosage, pH, Cr(VI) concentration, purging gas, type of organiccompounds. FT-IR and XRD analysis demonstrated hybridization of ZnO nanoparticles and TiO2 particles. The photocatalytic reduction of Cr(VI) was increased with increasing photocatalyst dosage anddecreasing pH. The reaction rate constant (kobs) was decreased from 0.0879 to 0.0048 min 1 withincreasing Cr(VI) concentration from 20 to 100 mg/L. Removal efficiency of Cr(VI) by UV/ZnO/TiO2process was about 99.99%, which was more effective than that by UV/ZnO (82.33%) and UV/TiO2 process(86.07%).
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Freshwater snails as the intermediate host of trematodes in Iran: a systematic review
Samira Dodangeh,Ahmad Daryani,Mehdi Sharif,Shirzad Gholami,Elham Kialashaki,Mahmood Moosazadeh,Shahabeddin Sarvi 한국역학회 2019 Epidemiology and Health Vol.41 No.-
Freshwater snails, as the first intermediate hosts of trematodes, can cause health hazards in animals and humans. Recently, the World Health Organization has included Iran in a list of 6 countries known to have serious problems with fascioliasis. In addition, cercarial dermatitis is a job-related disease that is seen often in paddy workers, agricultural labourers, and fishermen in Iran, particularly in Mazandaran Province. Many studies have been conducted in Iran to survey larval trematodes in freshwater snails. However, to the best of our knowledge, no comprehensive data exist regarding infections in gastropods. Therefore, the aim of the present study was to estimate the types and prevalence of cercarial infections in snails in Iran. Electronic English-language and Persian-language databases were searched to identify 24 published articles reporting the prevalence of trematode infections in snails (9 species from 6 families) in various provinces of Iran. In total, 4.4% of gastropods were infected with the larval stages of trematodes. According to the studies reviewed in this meta-analysis‚ the highest infection prevalence was found in Radix auricularia (9.9%). Twelve larval species of trematodes were identified, and the highest prevalence of cercariae was found for Echinostomatidae cercariae (4.3%). Among the provinces explored, West Azerbaijan had the highest prevalence of infected snails (16.9%). The presence of trematodes in snails could pose a serious health problem in Iran. Thus, further studies are necessary to characterize these infections in other provinces.
KCI
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