در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Pistachio and Health Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: photocatalyst,Pesticide,Mesoporous material,GO-Fe3O4/TiO2 nanocomposite,Fenitrothion
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 02-01-1398
- نویسندگان: Mostafa Zangiabadi,Asma Saljooqi,Tayebeh Shamspur,Ali Mostafavi,Fatemeh Mehrabi,Maryam Mohamadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Pistachio and Health Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Melatonin,Ultrasound-assisted extraction,Solid-liquid extraction
- چکیده:
- چکیده انگلیسی: Background: Melatonin is involved in regulation of circadian rhythm and alleviation of sleep disorders, such as insomnia
due to jet lag and shift work, as it plays a major role in synchronization of the sleep/wake cycle
Materials and methods: This study is devoted to extraction and determination of melatonin in Pistacia atlantica using an
ultrasound-assisted solid-liquid extraction (SLE) combined with UV-Vis Spectroscopy. The volume and type of extraction
solvent, sonication time, and extraction temperature on the extraction efficiency were optimized.
Results: Under optimum conditions, use of 30 mL of ethanol and 30 min sonication time caused to achieve the limit of
detection (LOD) of 0.047 ppm. The method accuracy was confirmed according to the calculation of recovery using standard
addition method that, exhibited the successful applicability of the present method for real sample analysis. In addition, the
obtained results were compared to those using gas chromatography/Mass spectroscopy (GC/MS). Combination of SLE and
UV-Vis leads to greater sensitivity and lower cost for accurate and repeatable extraction of melatonin from Pistacia atlantica
with acceptable recovery and RSD% (1.04%).
Conclusion: Therefore, we efficiently extracted and purified of melatonin from an inexpensive source (Pistacia atlantica
fruit). The extracted melatonin can be replaced synthetic drugs.
- انتشار مقاله: 28-12-1396
- نویسندگان: Masoud Derakhshan,Asma Saljooqi,Ali Mostafavi,Tayebeh Shamspur
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Methylene blue,Photodegradation,Core-shell magnetic nanostructure,Visible light driven
- چکیده:
- چکیده انگلیسی: In the present study, the core-shell magnetic nanostructure of Fe3O4@SiO2@CeO2 was synthesized to investigate its use as an effective photocatalyst for methylene blue removal. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and a vibrating sample magnetometer (VSM). The photocatalytic activity for the Fe3O4@SiO2@CeO2 core-shell magnetic nanostructure was investigated under visible light by determining the degradation rate of methylene blue for 50 min. At the end of the photocatalytic degradation process, the magnetic catalyst was recovered by an external magnetic field. The performance of the proposed catalyst for the degradation of methylene blue was improved with the optimization of the effective parameters such as the amount of catalyst, pH, and reaction time. Under optimum conditions, the efficiency of methylene blue removal with the proposed photocatalyst remains higher than 92 % after five times of use. The second pseudo-model was selected as the kinetic model to calculate catalytic degradation. The present results show that the Fe3O4@SiO2@CeO2 can be an efficient nanocatalyst for the photodegradation of dye pollutants.
- انتشار مقاله: 06-01-1399
- نویسندگان: Fatemeh Ziaadini,Ali Mostafavi,Tayebeh Shamspur,Fariba Fathirad
- مشاهده