Sedigheh Abbasi

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• Associate Professor
• Associate Professor at Esfarayen University of Technology

Synthesis of different phases of titania nanoparticles (TiO2) and decorated Multi-walled carbon nanotubes (MWCNTs) with various content of rutile titania have been performed. The samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy and X...

In this research, nanocomposites based on two-dimensional nanostructures such as graphene oxide were used as photocatalysts to remove methyl orange. One of the most important advantages of this type of photocatalyst is its high efficiency in the decomposition of colored organic pollutants, as well as its ease of separation at the end of the process...

The configurations, electronic, and magnetic properties of the H 2 DBP-M clusters have been investigated via density functional theory. The results reveal that the TM atoms for the H 2 DBP-M ([Formula: see text], Y, Zr, Nb, Lu, and Hf) clusters deviate from the center planes of the clusters. The H 2 DBP-M ([Formula: see text], Y, and Lu) clusters d...

In this study, in order to prepare magnetic nanocomposite, TiO 2 nanoparticles and Fe 3 O 4 nanoparticles are uniformly synthesized on the surface of graphene oxide by hydrolysis and hydrothermal methods, respectively. The efficiency of the synthesized nanocomposite (MGO@ Fe 3 O 4 ) for the photocatalytic decomposition of methyl orange is investiga...

In this research, magnetic nanocomposite (MGO@TiO2) consisting of Fe3O4, TiO2 and graphene oxide is synthesized for the photocatalytic removal of methyl orange, and its photocatalytic activity is compared with the nanohybrid (Fe3O4@TiO2) without graphene oxide. The crystalline phases of both photocatalysts are determined using X-ray diffraction pat...

The influence of three main parameters including irradiation time, weight fraction of photocatalysts including multi-walled carbon nanotubes and different amount of TiO2 (MCT#1 and MCT#2) and pH is investigated for the degradation rate of methyl orange (MO). Analysis of variance (ANOVA) and response surface methodology (RSM) have been applied to st...

The decomposition rate of methyl orange (MO) is studied in aqueous solution of magnetic photocatalysts based on graphene oxide (GO). ZnO photocatalytic nanoparticles are synthesized with controlled amounts on magnetized graphene oxide and two photocatalytic samples including GFZ1 and GFZ2 are prepared for use in advanced oxidation process. The char...

The main goal of the present research is the synthesis of new photocatalysts to reduce the amount of organic pollutants in aquatic environments. For this purpose, the amount of TiO 2 nanoparticles in the synthesized samples containing MWCNTs is controlled to synthesize two types of photocatalysts named as MCT#1 and MCT#2. Samples characterizing usi...

Transition metal (Mn, Fe, Co and Ni)-doped tungsten oxides nanoparticles with magnetic properties may be applied in various catalysts such as water treatment as they are easy to be recycled. Structural, electronic and magnetic properties of TMn@W12O36 (TM=Mn, Fe, Co and Ni, n=1–4) clusters have been calculated at PBE level. The results reveal that...

Structures, electronic properties and dipole magnitudes of first-row transition atoms (TM)-substituted Zn24S24 clusters have been investigated by using first-principles. The Zn-S distances at the edges of the Zn24S24 and TMZn23S24 clusters become smaller than those at the centers of them. The TMZn23S24 (TM=Ti and Ni) clusters exhibit more structura...

Water pollution is considered a serious threat to human life. An advanced oxidation process in the presence of semiconductor photocatalysts is a popular method for the effective decomposition of organic pollutants from wastewater. TiO2 nanoparticles are widely used as photocatalysts due to their low cost, chemical stability, environmental compatibi...

Here, we prepared two kinds of nanocomposites (MCT#1 and MCT#2) involving MWCNTs and TiO 2 nanoparticles. The character-isation of the samples is carried out based on FTIR spectroscopy and TEM. The Ti-O groups that is attributed to the TiO 2 nanopar-ticles can be confirmed according to the FTIR analysis. TEM images show that the average particle si...

In this study the synthesized photocatalysts such as TiO2 nanoparticles and MWCNTs@TiO2 are applied for elimination of methyl orange (MO). The results confirm that the MO concentration is reduced by enhancement of irradiation time and weight fraction of photocatalysts. However, the degradation rate of MO using MWCNTs@TiO2 is higher than that of TiO...

Magnetic graphen oxide (Fe3O4-GO) is applied for preparation of Fe3O4-GO-ZnO (MGOZ) nanocomposite as photocatalyst. The photocatalysts are characterized by FTIR and UV spectrophotometer. FTIR results confirm the presence of Zn–O bonds and Fe–O bonds that are attributed to the ZnO and Fe3O4, respectively. The removal efficiency of methyl orange (MO)...

Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO2 nanoparticles via a two-step hydrolysis technique. Firstly, the pristine MWCNTs are functionalized in nitric acid (HNO3) to creation of oxygen containing groups. Secondly, TiO2 nanoparticles are synthesized on the surface of functionalized MWCNTs through hydrolysis met...

Here, CeO2 nanorods (CeO2NRs) were successfully synthesized and characterized. Pt nanoparticles were synthesized in the presence of CeO2NRs and the matrix of polyaniline (PA) and chitosan (CH) as support to prepare the novel Pt-CeO2NRs/PA-CH nanocomposite. The electrocatalytic performance of Pt-CeO2NRs/PA-CH was investigated for methanol oxidation...

Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO2 nanoparticles via a two-step hydrolysis technique. Firstly, the pristine MWCNTs are functionalized in nitric acid (HNO3) to creation of oxygen containing groups. Secondly, TiO2 nanoparticles are synthesized on the surface of functionalized MWCNTs through hydrolysis met...

Solid state reaction technique was employed to fabricate oxygen sensors based on Y, Cr co-doped CaZrO3. The X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, electron-blocking method were employed to investigate the crystal structure, surface morphology, and electrical properties such as phase formation, micro...

Two kinds of magnetic adsorbents containing ZnO nanoparticles and graphene oxide (MGOZ#1 and MGOZ#2) are synthesized for photocatalytic degradation of methyl orange (MO). The prepared adsorbents are characterized using VSM and TEM. The results show that both of MGOZ#1 and MGOZ#2 are superparamagnetic. Meanwhile, the enhancement of ZnO content in MG...

The viscosity of nanofluids is affected by several factors such as temperature and weight fraction. In this study, we investigate for the first time the effect of them on the viscosity of nanofluids containing MWCNTs-Ag, with different amount of Ag nanoparticles (MWAg-1 and MWAg-2) using 2-level factorial design. The results of FTIR and XRD analysi...

و مقادیر مختلف از نانوذرات Fe3O4 در این تحقیق دو نوع نانوکامپوزیت حاوی اکسید گرافن و نانوذرات مغناطیسی سنتز گردید. نمونه های سنتز شده با GO-Fe3O4-ZnO-0.125 و GO-Fe3O4-ZnO-0.25 با کدهای ZnO فتوکاتالیستی استفاده طیف پراش اشعه ایکس آنالیز گردید و فعالیت فتوکاتالیستی آنها جهت تجزیه آلاینده متیل اورانژ در زمان های تابش دهی مختلف و اسیدیته مختلف و اسیدی...

در این تحقیق تاثیر حضور اکسید گرافن بر روی تجزیه فتوکاتالیستی متیل اورانژ با استفاده از نانوکامپوزیت مغناطیسی حاوی اکسید روی مورد بررسی قرار گرفت. نتایج حاصل شده نشان داد که با افزایش زمان تابش¬دهی (در محدوده 5 دقیقه تا 40 دقیقه) و غلظت فتوکاتالیست¬های فاقد اکسید گرافن و همچنین دارای اکسید گرافن (در محدوده 0.1 تا 0.3 درصد وزنی) میزان تجزیه متیل اور...

Pure anatase TiO2 nanoparticles and two kinds of TiO2–SnO2 nanocomposite with different amounts of SnO2 nanoparticles (A-S (1-1) and A-S (1-2)) are synthesised. The X-ray diffraction (XRD) pattern is used for the characterisation of the synthesised samples. The XRD results confirmed that synthesised TiO2 nanoparticles have an anatase structure and...

In this study graphene oxide (GO) is applied as a substrate for the synthesis of the magnetic ZnO nanocomposite (GO-Fe3O4-ZnO). The prepared samples are characterised using XRD and VSM. The photocatalytic performance of the synthesised samples is evaluated according to the photodegradation of methyl orange (MO) as an organic dye pollutant model. Th...

Titania nanoparticles with two crystalline structures (anatase-rutile) and coated titania with different amount of tin dioxide (A-R-S#1 and A-R-S#2) are prepared through hydrolysis method. X-ray diffraction analysis (XRD) confirmed the presence of both anatase and rutile structures in the synthesized titania nanoparticles. In addition, the characte...

Single Cu nanorods and decorated Cu nanorods with Ag nanoparticles (Cu-Ag nanorods) are synthesized by hydrothermal procedure for investigation the thermal conductivity of water-based nanofluids. The characterization of the synthesized samples is carried out using XRD and TEM. The XRD results show that the observed characteristic peaks belong to cr...

In the current study, we want to optimise the removal efficiency of methyl orange using decorated multi-walled carbon nanotubes (MWCNTs) with different amount of ZnO nanoparticles. For this purpose, we investigate the influence of several parameters such as UV irradiation time, pH of the solution and weight fraction of photocatalysts on the removal...

In this paper, the statistical analysis of thermal conductivity of nanofluids containing decorated Ag nanorods with Cu nanoparticles was performed. For this purpose, Ag-Cu hybrid was synthesized and characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. TEM studies showed that Cu nanoparticles successfully...

The effect of temperatures (25, 40, 55, and 70 °C) and weight fraction of MWCNTs (0.125, 0.25, and 0.5 % wt) on the viscosity of nanofluids containing pristine and functionalized MWCNTs is investigated. For this purpose, all of the measurements were carried out in triplicate and were analyzed using the two-factor completely randomized design, and c...

Background and Objectives: The presence of dye organic pollutants such as methyl orange is an imperative threat for environment. Therefore, the main aim of this study is synthesize of the ZnOSnO2- Ag nanocomposite and elimination of methyl orange from water using advanced oxidation process and synthesized photocatalytic nanocomposite. Material and...

Here, graphene oxide is synthesized and functionalized with methyl viologen and chitosan to be used as a novel catalyst support for Pt nanoparticles. The particle size and distribution of Pt nanoparticles are characterized by transmission electron microscope images. Pt nanoparticles with the mean particle size of 3.62 nm are dispersed on the suppor...

We synthesize the ZnO- SnO2 hybrid with different amount of SnO2 nanoparticles and study the photocatalytic performance of them for photocatalytic oxidation of methyl orange (MO) according to the statistical analysis for the first time. The ZnO-SnO2 hybrids have been characterized by XRD, FTIR, TEM and UV-vis spectroscopy. XRD results reveal that t...

In this research, pure SnO2 was deposited on 316 stainless steel plates using air plasma spraying. Micrograph and phase composition of the deposited films were studied using SEM and X-ray diffraction, respectively; and methylene blue solution was used to evaluate the activity of the deposited photocatalytic coatings. It was shown that air plasma sp...

In this study, the pure TiO2 nanoparticles and two kinds of hybrids including decorated TiO2 nanoparticles with SnO2 nanoparticles (A-S (1-1) and A-S (1-2)) are synthesized by hydrolysis method in order to evaluate the photocatalytic activity. The synthesized photocatalysts are characterized using FTIR. The photocatalytic performance is recorded by...

In this research, graphene oxide was prepared by a modified Hummers’ method, and then functionalized with 1, 1′-dimethyl-4, 4′-bipyridinium dichloride (MV), and chitosan (CH) to get a MV–RGO–CH support. Pt nanoparticles were prepared on this support to get Pt/MV–RGO–CH catalyst. The morphology and microstructure of Pt/MV–RGO–CH catalyst were charac...

In this research, we synthesize two kinds of hybrids containing decorated ZnO nanoparticles with different amount of SnO2 nanoparticles. The photocatalytic activity of the prepared hybrids is evaluated by photodecomposition of methylene blue as an organic pollutant. The synthesized hybrids characterized using transmission electron microscopy (TEM)....

The purpose of this study is to statistically analyze the anodic current density and peak potential of methanol oxidation at Pt nanoparticles supported on functionalized reduced graphene oxide (RGO), using design of experiments methodology. RGO is functionalized with methyl viologen (MV) and chitosan (CH). The novel Pt/MV-RGO-CH catalyst is success...

Here, graphene oxide (GO) was synthesized by a modified Hummers’ method and was functionalized with 1,1′-dimethyl-4,4′-bipyridinium dichloride (MV) accompanied by chitosan (CH) to prepare a novel MV-RGO-CH support. Pt/MV-RGO-CH catalyst was prepared by immobilization of the Pt nanoparticles on MV-RGO-CH support. The microstructure and morphology of...

In this work, we reported the variation of the photo degradation of methyl orange with pH using three kinds of MWCNTs-ZnO hybrids. The obtained results exhibit that the removal efficiency of methyl orange using all applied photocatalysts increases by increasing the irradiation time. Meanwhile, the results show that the augmentation of the MWCNTs co...

Photo degradation of the organic pollutants using photocatalysts is affected by several factors. The main goal of the current study is investigation the effect of UV irradiation time (ranging from 5 to 25 min), pH of suspension (4, 7 and 10) and weight fraction (0.125, 0.25 and 0.5wt%) of decorated MWCNTs with ZnO nanoparticles (MWCNTs-ZnO) as phot...

Here, metal nanoparticles were synthesized by chemical reduction of the corresponding metal salts in the presence of chitosan polymer. Binary and ternary metallic-chitosan Pt-Fe-CH, Pt-Co-CH and Pt-Fe-Co-CH nanocomposites were prepared. Transmission electron microscopy images and UV–Vis spectra of the nanocomposites confirmed the presence of the me...

The main goal of this paper is the experimental and statistical investigation of the photo decomposition of methyl orange using decorated multi-walled carbon nanotubes (MWCNTs) with different amount of ZnO nanoparticles (MWCNT–ZnO). The synthesized photocatalysts are characterized by FTIR and TEM. The synthesis of ZnO nanoparticles in the all synth...

In this paper we investigate for the first time the statistical analysis of photocatalytic activity of decorated Multi-walled carbon nanotubes (MWCNTs) with ZnO nanoparticles. For this purpose, MWCNTs are oxidized using mixture of H2SO4 and HNO3 to functionalize with oxygen containing groups. Therefore, functionalized groups act as active site for...

In this study we investigate for the first time the effect of pH on the photocatalytic activity of SnO2 nanoparticles, ZnO nanoparticles and hybrids containing decorated ZnO nanoparticles with difference amount of SnO2 nanoparticles (ZnO–SnO2 (1–0.5) and ZnO–SnO2 (1–2)). The experimental results show that the removal efficiency of methyl orange inc...

Background and Objective: Owing to the extended usage in the safekeeping of environments, the photocatalytic materials have been widely applied. The purpose of the present study was to investigate the photocatalytic activity of ZnO and SnO2 nanoparticles in removal of methyl orange from aqueous media. Materials and Methods: ZnO and SnO2 nanopartic...

In this work, Pt, Fe and Co nanoparticles were prepared by chemical reduction of the metal salts in chitosan as the support. NaBH4 was used as the reducing agent Pt-Fe, Pt-Co and Pt-Fe-Co-chitosan nanocomposites were synthesized and characterized by UV–Vis spectra and Transmission electron microscopy images. GC/Pt-chitosan, GC/Pt-Co-chitosan, GC/Pt...

We report the thermal conductivity modeling of nanofluids containing decorated MWCNTs with TiO2 nanoparticles. Therefore we synthesis TiO2 nanoparticles and decorated MWCNTs with different amount of TiO2 nanoparticles. The experimental results show that the measured thermal conductivities of TiO2 nanofluids and MWCNTs nanofluids are higher than the...

Abstract The effects of temperature and concentration on the flow behavior and viscosity of nanofluids containing TiO2 nanoparticles, pristine MWCNTs, oxidized MWCNTs and decorated MWCNTs with TiO2 nanoparticles are experimentally investigated. The results of rheological characteristics of nanofluids revealed that nanofluid of TiO2 nanoparticle and...

هدف اين تحقيق, سنتز و مشخصه¬یابی نانومیله¬های مس و نقره و همچنین بررسی تغییرات میزان هدایت حرارتی نانوسیال¬های حاوی نانومیله¬های سنتز شده و آب می¬باشد. بدین منظور از AgNO3 و CuCl2 به عنوان پیش¬ساز نانومیله¬های نقره و مس استفاده گردید. فاز کریستالی نانومیله-های سنتز شده با استفاده از طیف XRD مورد آنالیز قرار گرفت. ارزيابی ميکروسکوپ الکترونی عبوری (T...

The aim of the current research is concentrated on the synthesis of the different nanoparticles such as SnO2 and ZnO nanoparticles and SnO2-ZnO hybrid via sol gel method to investigate their photocatalytic applications for removal of methyl orange pollutant in water. Therefore, ZnCl2 and SnCl2.2H2O were used as ZnO and SnO2 source respectively. The...

In this paper, we report for the first time, thermal conductivity behavior of nanofluids containing decorated MWCNTs with different amount of TiO2 nanoparticles. TEM image confirmed that the outer surface of MWCNTs successfully decorated with TiO2 nanoparticles. The results of thermal conductivity behavior of nanofluids revealed that the thermal co...

Abstract The effects of temperature and concentration on the flow behavior and viscosity of nanofluids containing TiO2 nanoparticles, pristine MWCNTs, oxidized MWCNTs and decorated MWCNTs with TiO2 nanoparticles are experimentally investigated. The results of rheological characteristics of nanofluids revealed that nanofluid of TiO2 nanoparticle and...

Abstract In this paper, we report for the first time the thermal conductivity behavior of nanofluids containing MWCNTs which decorated with different amount of TiO2 nanoparticles. For this purpose we synthesis the TiO2 nanoparticles and decorated MWCNTs with different amount of TiO2 nanoparticles using hydrolysis method. The samples are characteriz...

Abstract The aim of the current research is concentrated on the modification of multi-walled carbon nanotubes (MWCNT) using TiO2 nanoparticles at rutile phase. In order to elucidate the role of TiO2 content on photocatalyst behavior of MWCNTs, the hybrids were prepared with different amounts of TiO2 nanoparticles. the opening and functionalization...

Abstract In this work, we investigated synthesis of SnO2 and ZnO nanoparticles via sol gel method and their photocatalitic applications for removal of methyl orange pullutant in water. For this purpose ZnCl2 and SnCl2.2H2O were used as ZnO and SnO2 source respectively. The samples were characterized by X-ray diffraction (XRD) spectroscopy, XRD res...

In this paper, we report for the first time the statistical analysis of thermal conductivity of nanofluids containing TiO2 nanoparticles, pristine MWCNTs and decorated MWCNTs with different amount of TiO2 nanoparticles. The functionalized MWCNT and synthesized hybrid of MWCNT-TiO2 were characterized using transmission electron microscopy (TEM). TEM...

High-performance mortars (HPMs) are very compact handmade composites with high compressive strength and low permeability and flexibility. Because of these properties, HPMs are used in special structural and defensive structures. This paper reports on the influence of functionalised multi-walled carbon nanotubes (MWCNTs) on the impact resistance and...

هدف از اين تحقيق، اتصال کووالانسی نانوذرات TiO2روی سطح نانولوله­های کربنی و بررسی پایداری و هدایت حرارتی نانوسيال می­باشد. نانولوله­های آرایش یافته با میکروسکوپ الکترونی عبوری (TEM) جهت اطمینان از اتصال نانوذرات TiO2 و طیف سنجی رامان جهت بررسی تغییرات میزان گرافیته شدن مورد بررسی قرار گرفتند. پایداری نانوسیال به کمک پتانسیل زتا بررسی گردید. تصاویر...

هدف از اين تحقيق، اتصال کووالانسی نانوذرات TiO2روی سطح نانولوله­های کربنی و بررسی پایداری و هدایت حرارتی نانوسيال می­باشد. نانولوله­های آرایش یافته با میکروسکوپ الکترونی عبوری (TEM) جهت اطمینان از اتصال نانوذرات TiO2 و طیف سنجی رامان جهت بررسی تغییرات میزان گرافیته شدن مورد بررسی قرار گرفتند. پایداری نانوسیال به کمک پتانسیل زتا بررسی گردید. تصاویر...

Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO2 nanoparticles via wet chemical method. For this purpose tetra chloride titanium (TiCl4) was used as titanium source. MWCNTs were exposed at dif-ferent amount of TiCl4 (0.25 and 0.1 ml) and different soaking times. The modified MWCNTs have been characterized by X-ray di...

In this work, we investigated CNT–TiO2 hybrids with different amount of TiO2 nanoparticles via wet chemical method. The procedure includes of generation of functional groups such as oxygen containing groups and attachment of TiO2 nanoparticles on the outer surface of MWCNTs. TEM image showed that the outer surface of MWCNTs modified with TiO2 nanop...

The purpose of this study is decoration of cabon nanotube with TiO2 nanoparticles using wet chemical method and investigation the stability of its nanofluid. To do this, multiwalled carbon nanotubes and TiCl4 were used as precursor of TiO2 nanoparticles. The decoration were systematically characterized using transmission electron microscopy (TEM)....

نانولوله هاي كربني با داشتن دانسيته كم، نسبت سطح به حجم بالا و ويژگي هاي الكتريكي، مكانيكي و حرارتي منحصربفرد مورد توجه بسياري از محققين قرار گرفتهاند. با اين وجود نانولولههاي كربني منفرد يكديگر را با نيروي 0/5eVجذب ميكنند. اين ويژگي سبب كاهش پراكندگي اين مواد در حلالهاي آبي و زمينههاي پليمري ميشود. در اين تحقيق، به منظور جلوگيري از تجمع نانولوله ك...

The effect of air drying temperature on shrinkage, rehydration ratio and microstructure of dried onion slices (3±0.2 mm thickness and 30 mm diameter) was studied. The different drying conditions led to distinctive structural changes in the samples, affecting the shrinkage and rehydration ratio. Experiments showed that the intensity of structural ch...

هدف اصل اين مقاله بدست آوردن و بررسي داده¬هاي آزمايشگاهي مربوط به خشک کردن پياز به کمک خشک کن غير مداوم کابينتي و مدلسازي اين فرآيند است. براي انجام اين کار تعدادي مدل تجربي و رگرسيوني جهت برازش داده¬هاي آزمايشگاهي در نظر گرفته شده اند. از بررسي داده¬هاي آزمايشگاهي نتيجه مي¬شود که خشک کردن پياز فقط در ناحيه شدت نزولي اتفاق مي¬افتد. اين داده ها با 1...

In this paper, the experimental data of the onion drying process by a batch cabinet dryer is investigated. Obtained experimental data including moisture content, shrinkage, and rehydration via random factorial scheme are analyzed. Comparison of data average is carried out with the help of the multi amplitude test of Duncan. Statistical analysis of...

Onion slices were dried under different processing conditions by hot air dryer. Slice thickness, air velocity were constant and inlet air temperature, drying time were varied to study the drying and shrinkage behavior. Thin layer drying of onion slices was carried out at air temperatures of 60, 70, 80 and 90 °C and air velocity of 1.5 m s . The con...

Onion slices were dried under different processing conditions by hot air dryer. Slice thickness, air velocity were constant and inlet air temperature, drying time were varied to study the drying behavior. Thin layer drying of onion slices was carried out at air temperatures of 60, 70, 80 and 90 °C and air velocity of 1.5 m s . The drying occurred i...