Search

Your search keyword '"Shahmoradi, Behzad"' showing total 285 results
Start Over Author "Shahmoradi, Behzad"
285 results on '"Shahmoradi, Behzad"'

23. Efficient Degradation of Diazinon Pesticide under Visible Light Irradiation Using CeO2 Functionalized Magnetite Graphene Oxide Heterojunction-Based Photocatalyst.

Author

Naynava, Seyed Khabat, Lorestani, Bahareh, Cheraghi, Mehrdad, Sobhanardakani, Soheil, and Shahmoradi, Behzad

Subjects
ORGANIC water pollutants, DIAZINON, GRAPHENE oxide, VISIBLE spectra, CERIUM oxides, ORGANOPHOSPHORUS pesticides, MAGNETITE
Abstract

Controlling the structure of cerium dioxide (CeO2)-based photocatalysts for the removal of organic contaminants in water is essential. Herein, GO/Fe3O4/CeO2 heterojunction photocatalyst is designed by a clear and simple method for photodegradation of diazinon under visible-light excitation. SEM, EDS, XRD, FTIR, VSM, and UV–vis were used to analyze the crystallinity and morphology of the GO/Fe3O4/CeO2 heterojunction. The UV–Vis analysis revealed a bandgap value of 3.19, 3.08, and 2.98 eV, respectively, for GO, GO@Fe3O4, and GO@Fe3O4@CeO2. The effects of important parameters such as pH (2.0–9.0), photocatalyst dose (10–40 mg), and contact time (0–180 min) were also investigated. The maximum diazinon degradation rate was found to be 97.9% in 60 min. In conclusion, the results indicated that GO@Fe3O4@CeO2 nanocomposite could be used as an efficient photocatalyst for the degradation of organic contaminants from water medium. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

43. Evaluation and Risk Assessment of Heavy Metals in the Groundwater Resources of Saqqez, Iran

Author

Kohzadi, Shadi, Shahmoradi, Behzad, Raushani, Daem, and Nouri, Asad

Subjects
Groundwater -- Contamination, Heavy metals -- Environmental aspects, Environmental issues, Health
Abstract

Groundwater is the main water resource in rural areas throughout the world. The present study aimed to measure nine heavy metals (arsenic, chromium, cobalt, iron, manganese, mercury, molybdenum, nickel, and zinc) in rural areas of Saqqez, Iran. Water samples were collected from 150 sampling stations (wells, springs, and tanks). The heavy metal concentrations were measured using inductively coupled plasma and the spatial distribution of the heavy metal concentrations was mapped. Risk assessment was performed using average daily dose and hazard quotient. The mean concentration of heavy metals in drinking water from different sources were found in order of iron > zinc > chromium > molybdenum > nickel > cobalt > arsenic > mercury > manganese. The concentrations of arsenic, iron, and molybdenum were, however, higher than World Health Organization and U.S. Environmental Protection Agency standards in a few of the samples. Moreover, the statistical analysis revealed that there are no significant variations between well, spring, and tank sources (p < .05). In addition, no significant difference was observed between water quality with different geographical directions and slopes (p < .05). The mean human health risk values for mercury in well and tank water sources were above 1, indicating potential risk., Introduction Water is the base of life on Earth: it is considered a vital substance in the environment, and its contamination with heavy metals (HMs) such as arsenic (As), chromium [...]

Published
2018

46. Dynamically driven perovskite La-Fe-modified SrTiO3 nanocubes and their improved photoresponsive activity under visible light: influence of alkaline environment.

Author

Suwannaruang, Totsaporn, Pratyanuwat, Acapol, Sinthujariwat, Putichot, Wantala, Kitirote, Chirawatkul, Prae, Junlek, Narong, Nijpanich, Supinya, Shahmoradi, Behzad, and Shivaraju, Harikaranahalli Puttaiah

Subjects
VISIBLE spectra, PEROVSKITE, CIPROFLOXACIN, PHOTODEGRADATION, OXIDATION states, CRYSTAL structure
Abstract

Visible-light active La-Fe-SrTiO3 (La0.01Sr0.99Fe0.01Ti0.99O3) photocatalysts were synthesized via a dynamic hydrothermal route under different NaOH concentrations (2, 3, 4, 5, and 6 M). The results showed that altering NaOH concentrations changed the physicochemical characteristics of the materials. Namely, the decrease in particle size was observed when the NaOH levels were increased. The specific surface area of the photocatalysts changed with an increased concentration of NaOH, and the maximum value was 17.10 m2/g in 5 M of NaOH. The crystal structure of all prepared samples remained unaffected when altered the NaOH concentration or when incorporated La and Fe in the lattice of SrTiO3. Namely, all samples synthesized under various NaOH concentrations crystallized and maintained in the standard cubic perovskite structure of SrTiO3. The increased NaOH concentration slightly altered the absorption wavelength towards a longer wavelength region. The La atom, replacing some Sr2+ in the structure of modified SrTiO3, was confirmed to be in the La3+ valence state. Simultaneously, Fe atoms demonstrating oxidation states of Fe3+ can also be incorporated into the SrTiO3 network. The photocatalytic degradation of ciprofloxacin antibiotic revealed that the highest performance was approximately 75% within 9 h over the La0.01Sr0.99Fe0.01Ti0.99O3 sample prepared at 5 M of NaOH via the dynamic hydrothermal process. Meanwhile, this photocatalyst also displayed greater activity than the pristine SrTiO3, the single-doped samples (SrFe0.01Ti0.99O3 and La0.01Sr0.99TiO3), and the La0.01Sr0.99Fe0.01Ti0.99O3 sample prepared through a static hydrothermal technique under the same synthesis condition. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

47. Photocatalytic transfer of aqueous nitrogen into ammonia using nickel-titanium-layered double hydroxide.

Author

Prabagar, Jijoe Samuel, Sneha, Yadav, Tenzin, Thinley, Shahmoradi, Behzad, Rtimi, Sami, Wantala, Kitirote, Jenkins, David, and Shivaraju, Harikaranahalli Puttaiah

Subjects
HYDROXIDES, NITROGEN, SOLAR spectra, ATMOSPHERIC ammonia, PHOTOCATALYSTS, NITROGEN fixation, AMMONIA, ATMOSPHERIC nitrogen
Abstract

The development of solar-driven transfer of atmospheric nitrogen into ammonia is one of the green and sustainable strategies in industrial ammonia production. Nickel-titanium-layered double hydroxide (NiTi-LDH) was synthesised using the soft-chemical process for atmospheric nitrogen fixation application under photocatalysis in an aqueous system. NiTi-LDH was investigated using advanced characterisation techniques and confirmed the potential oxygen vacancies and/or surface defects owing to better photocatalytic activity under the solar spectrum. It also exhibited a bandgap of 2.8 eV that revealed its promising visible-light catalytic activities. A maximum of 33.52 µmol L−1 aqueous NH3 was obtained by continuous nitrogen (99.9% purity) supply into the photoreactor under an LED light source. Atmospheric nitrogen supply (≈78%) yielded 14.67 µmol L−1 aqueous NH3 within 60 min but gradually reduced to 3.6 µmol L−1 at 330 min. Interestingly, in weak acidic pH, 20.90 µmol L−1 NH3 was produced compared to 11.51 µmol L−1 NH3 in basic pH. The application of NiTi-LDH for visible-light harvesting capability and photoreduction of atmospheric N2 into NH3 thereby opens a new horizon of eco-friendly NH3 production using natural sunlight as alternative driving energy. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results