Synthesis and characterization of Pd-Ni catalysts supported on KIT-6 and their application in cyclohexane oxidation using molecular oxygen

Bahareh Reisi,Ali Reza Najafi Chermahini,Daily Rodríguez-Padrón,Mario J. Muñoz-Batista,Rafael Luque 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-

Bimetallic Pd-Ni catalysts were prepared via impregnation method, with effects of Pd/Ni ratio (wt%) ontheir catalytic performance for the oxidation of cyclohexane with molecular oxygen being investigated. Synthesized catalysts were characterized by a series of techniques including XRD, Nitrogen adsorption–desorption, H2-TPR, XPS, ICP-AES, TEM, SEM, and EDX. Compared to monometallic Pd, the additionof Ni to Pd was found to be effective in enhancing the selective oxidation of cyclohexane. Parameters suchas the temperature of the reaction, reaction times, catalyst amount, initial oxygen pressure and differentsolvents were investigated. Optimum conditions to improve cyclohexane conversion and selectivitytowards KA-oil (a mixture of cyclohexanone and cyclohexanol) over 4.0%Pd-4.0%Ni/KIT-6 catalystincluded 140 C, 1.0 MPa O2 and acetonitrile as solvent. Under these reaction conditions, 10.87 % conversionand 95.45 % selectivity for KA-oil were observed after 8 h of reaction. Reusability studies of theselected catalyst revealed an outstanding stability along four reaction cycles.

Bioelectricity production in photosynthetic microbial desalination cells under different flow configurations

Bahareh Kokabian,Renotta Smith,John P. Brooks,Veera Gnaneswar Gude 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-

This study presents the first report on the performance of Photosynthetic microbial desalination cells under different flow configurations. Three different photosynthetic MDCs (using Chlorella vulgaris) were evaluated for their performance and energy generation potentials. Static (fed-batch, SPMDC), continuous flow (CFPMDC) and a photobioreactor MDC (PBMDC, resembling lagoon type PMDCs) were developed to study the impact of process operation and design on wastewater treatment, electricity generation, nutrient removal, and biomass production capacities. A maximum power density of 753.75 mW m−3 was produced in a SPMDC while a higher biomass growth rate of 7 mg L−1 h−1 was recorded for CFPMDC. In addition, PMDCs showed high removal rates of organic carbon and nutrient compounds. Experimental studies revealed that PMDCs can be configured to maximize energy recovery through either biomass or bioelectricity production. Finally, microbial composition analysis on different biosolids samples in the PMDCs revealed very diverse groups of microbial communities.

Live Load Distribution Factor for Tank Loading on Slab-Girder Bridges

Bahareh Miranbeigi,Shervin Maleki 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8

The aim of this research is to obtain the bending moment and shear live load distribution factors (LLDFs) for interior girders of simply supported slab-girder bridges subjected to continuous loading, such as military tanks. The effective parameters considered in calculating the live load distribution factor were: Girders’ number and spacing, span length, slab thickness and the longitudinal to transverse ratio of deck stiffness. Over fifty 3D finite element models were created based on the existing information of bridges in the USA. An equation was obtained for the distribution factor and its validity was assessed against the numerical results. The proposed equation was compared with the AASHTO-LRFD equation for one lane of standard truck loading and also with the equation proposed by the US army corps of engineers for military vehicles. The accuracy of the equation was also verified by performing several sensitivity analyses for the parameters involved. It is concluded that the proposed LLDF equation predicts the distribution factor more accurately than the above mentioned specifications.

Effect of Intravenous Lipid Emulsion on Clozapine Acute Toxicity in Rats

Bahareh Sadat Yousefsani,Seyed Ahmad Mohajeri,Mohammad Moshiri,Amir Hossein Jafarian,Hossein Hosseinzadeh 대한약침학회 2019 Journal of pharmacopuncture Vol.22 No.3

Objectives: Many studies have been reported the efficacy of intravenous lipid emulsion (ILE) as an antidote on acute lipophilic drug toxicity. Clozapine, highly lipophilic dibenzodiazepine neuroleptics, is an important medication in the schizophrenia therapy regimen. Acute intoxication with antipsychotics is one of the main reasons for the referral of poisoned patients to the hospital. We expected that ILE could be used for the therapy of acute clozapine intoxicated patients. Methods: We used two groups of consisting of six male rats. Both groups received a toxic dose of clozapine (40 mg/kg) intravenously, via the tail vein. After 15 minutes, they were treated with intravenous infusion of 18.6 mg/ kg normal saline (NS group), or 18.6 mg/kg ILE 20% (ILE group). We evaluated blood pressure (BP) and heart rate by power lab apparatus through the tail artery, ataxia by a rat rotary circle, seizure scores and death in multiple times after starting clozapine administration. For bio-chemical and pathological evaluations the samples of tissue and blood were taken. Results: Our results demonstrated that ILE 20% could return hypotension-induced clozapine better than normal saline. Furthermore, ataxia and seizure have rectified more rapidly and deaths reduced. Clozapine administration causes pancreatitis and lung injury but fat emulsion did not show an optimal effect on tissue damages caused by clozapine toxicity. Conclusion: In conclusion, ILE can remove toxic signs of clozapine same as other lipophilic medicines, however, clinical uses of ILE for this intention requires more appraisement to determine the precise implication and safety.

Polyphenylsulfone/polyethylene glycol hexadecyl ether blend membranes with enhanced surface hydrophilicity for high-performance nanofiltration of dye solution

Bahareh Rastegar,Ehsan Saljoughi,Seyed Mahmoud Mousavi,Shirin Kiani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9

Hydrophilic membranes composed of polyphenylsulfone (PPSU)/polyethylene glycol hexadecyl ether (Brij-58), with noticeable properties and performance in the filtration of dye solution, were prepared for the first time. Scanningelectron microscopy (SEM) images were utilized to examine the morphology of the obtained membranes. Attenuatedtotal reflection Fourier-transform infrared (ATR-FTIR) spectra, water contact angle, water uptake capacity, andtensile properties of the membranes confirmed that Brij-58 remained in the structure of the obtained membranes dueto the high molecular weight of the additive. Higher water contact angle and water uptake capacity obtained withincreasing the Brij-58 concentration showed enhanced membrane hydrophilicity. The addition of Brij-58 and increasingits concentration was followed by a constant increase in pure water flux (PWF) and antifouling property of themembrane. According to the results, the incorporation of 10 wt% Brij-58 into the polymeric solution contributed toalmost 54-fold higher water flux and approximately 36% higher flux recovery ratio (FRR), while the rejection ofdisperse blue was only slightly reduced.

High photocatalytic activity of light-driven Fe2TiO5 nanoheterostructure toward degradation of antibiotic metronidazole

Bahareh Karimi,Mohammad Hossein Habibi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-

Monodispersed Fe2TiO5 nanoheterostructure was prepared via simple surfactant-assisted sol–gelmethod using cetyltrimethylammonium bromide (CTAB). After quantitative and qualitative analysis ofnanostructures, simulated light-driven performance of Fe2TiO5 thinfilm as heterogeneous photocatalysttoward photodegradation of antibiotic metronidazole was investigated and compared with its formingmetal oxides. Results showed the highest photocatalytic activity for Fe2TiO5 after 2 h of irradiation bywhich the pseudofirst-order photodegradation reaction of metronidazole leads to water and carbondioxide production. Increase the photocatalysis efficiency based on Fe2TiO5 photocatalyst relative to TiO2and Fe2O3 is due to lower mean size, more uniform distribution of nanoparticles and consequently anincrease in the surface area available for the photocatalytic reaction, also the two metal centersarrangement in one structure that were resulted in effective light harvesting and enhancing theprobability of reduction–oxidation reactions owing to fast transferring of charge carriers to surface withpromoting separation and limiting recombination.

Identification and toxigenic potential of a Nostoc sp.

Bahareh Nowruzi,Ramezan-Ali Khavari-Nejad,Karina Sivonen,Bahram Kazemi,Farzaneh Najafi,Taher Nejadsattari 한국조류학회I 2012 ALGAE Vol.27 No.4

Cyanobacteria are well known for their production of a multitude of highly toxic and / or allelopathic compounds. Among the photosynthetic microorganisms, cyanobacteria, belonging to the genus Nostoc are regarded as good candidate for producing biologically active secondary metabolites which are highly toxic to humans and other animals. Since so many reports have been published on the poisoning of different animals from drinking water contaminated with cyanobacteria toxins, it might be assumed that bioactive compounds are found only in aquatic species causes toxicity. However, the discovery of several dead dogs, mice, ducks, and fish around paddy fields, prompted us to study the toxic compounds in a strain of Nostoc which is most abundant in the paddy fields of Iran, using polymerase chain reaction and liquid chromatography coupled with a diode array detector and mass spectrophotometer. Results of molecular analysis demonstrated that the ASN_M strain contains the nosF gene. Also, the result of ion chromatograms and MS2 fragmentation patterns showed that while there were three different peptidic compound classes (anabaenopeptin, cryptophycin,and nostocyclopeptides), there were no signs of the presence of anatoxin-a, homoanatoxin-a, hassallidin or microcystins. Moreover, a remarkable antifungal activity was identified in the methanolic extracts. Based on the results, this study suggests that three diverse groups of potentially bioactive compounds might account for the death of these animals. This case is the first documented incident of toxicity from aquatic cyanobacteria related intoxication in dogs, mice, and aquatic organisms in Iran.

Fuzzy Temperature & Humidity System Optimization By Simulated Annealing

Bahareh Pourbabaee,Mahdi Shadalooee,Caro Lucas 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

One of the considerable topic during human life has been climate parameters control such as temperature & humidity and preparing desirable condition in order to keep creatures growing. In this paper, temperature & humidity of an animal keeping center is modeled and returned to its desirable condition by the use of fuzzy logic theory and Simulated Annealing (SA) algorithm .Whenever the climate, as a fuzzy system output variable, become unsatisfactory, Simulated Annealing algorithm finds the best way of returning system temperature and humidity to their set points with a minimum time and energy among the different ways of system temperature and humidity reduction. Our work shows the efficiency, convergence behavior of SA algorithm in a short time during its searching process, apparently. The temperature and humidity data used in this paper get from one of the animal keeping center in Tehran, Iran.

Click Electroless Plating and Sonoplating of Polyester with Copper Nanoparticles Producing Conductive Fabric

Bahareh Moazzenchi,Majid Montazer 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3

Here, copper nanoparticles were in situ synthesized on polyester fabric using cost effective chemicals, withoutstabilizing and sensitizing agents through a simple click electroless plating method to attain the electrical conductivefabric. Central composite design based on response surface methodology was applied to study the influence of copper saltprecursor and reducing agent concentration on the electrical resistivity. The best sample with the lowest electricalresistivity was chosen and analyzed and then similar processing conditions were applied under ultrasonic conditionbesides final fabrics were subjected to the diverse characterizations. Findings suggested the potentiality of the one-potsonoplating method for fabrication of copper nanoparticles on polyester fabric. The successful synthesis of coppernanoparticles on the polyester fabric was verified by scanning electron microscopy (SEM) images and X-ray diffraction(XRD) patterns. A remarkable low electrical resistivity of 0.5 Ω·cm obtained on the sonotreated samples produced withincorporation of copper nanoparticles. Further, good results indicated on the mechanical properties of the copper treatedfabrics. All of the observations perceive the great potential applications of the product in electrical, medical and smarttextiles industries.

Separation of glatiramer acetate and its constituent amino acids using aqueous two-phase systems composed of maltodextrin and acetonitrile

Bahareh Afzal Shoushtari,Javad Rahbar Shahrouzi,Gholamreza Pazuki,Shahla Shahriari,Naghmeh Hadidi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-

Glatiramer acetate (GA), FDA-approved therapeutic for multiple sclerosis (MS), is a random-sized syntheticpolypeptide composed of four amino acids: tyrosine, glutamic acid, alanine, and lysine. This workaims to design an efficient protocol for the separation of GA from its broth. For this purpose, the feasibilityof a carbohydrate-based aqueous two-phase system (ATPS) for separation of GA from the amino acidswas investigated. Initially, the binodal curve and tie-lines for the ATPS composed of maltodextrin andacetonitrile were determined. Next, preliminary screening experiments for determining optimum conditionswere conducted by introducing GA and amino acids into the ATPS individually and the effect of pHand carbohydrate concentration on partition coefficient were investigated. Results revealed that glutamicacid and alanine were migrated toward the acetonitrile rich phase while GA, tyrosine, and lysin showedthe opposite trend. Besides, the partitioning of amino acids was correlated with their physicochemicaland structural properties. The preliminary results suggested that the system composed of maltodextrin15 wt%, acetonitrile 35 wt%, at pH = 6 can be considered as the optimum feed. In the next step, the partitioningof GA and amino acids broth was investigated in the optimum feed. Under these conditions, thepartition coefficient and selectivity of GA were obtained to be 1.17 and 62%, respectively. Additionally,circular dichroism spectroscopy results proved that the structure of GA remains unchanged during theseparation steps. Finally, a recovery method was proposed where the acetonitrile was evaporated andmaltodextrin was precipitated by the addition of methanol.