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Abdolhamid Namdarian,Amin Goljanian Tabrizi,Nasser Arsalani,Alireza Khataee,Abdolkhaled Mohammadi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Photocatalytic processes have attained considerable attention of late years, especially for environmentalremediation. Despite extensive research in this area, the need for safer, more efficient, and cost-effectiveprocesses has encouraged researchers to develop novel photocatalysis. However, the low active surfacearea and narrow bandgap limit their photocatalytic performances. In the present research, the 2D BiOClsheets were successfully synthesized by a new hydrothermal method and decorated by PANi nanoarraysthrough in-situ oxidative polymerization of aniline. The UV–vis diffuse-reflectance and photo-luminescence spectroscopy revealed the synergistic effects between PANi nanoarrays and 2D BiOClby enhancing the absorption in the visible light region and reduction of bandgap down to 2.9 eV. Furthermore, the morphology analysis showed the proper decoration of PANi nanoarrays on 2D BiOClnanoplates. The synthesized nanocomposite with different weight loadings of PANi was taken to evaluatethe decolorization efficiency of it. The result exhibited an optimum value of 88.35% at 60 min irradiationunder visible light in the photodegradation of Congo Red (CR). Moreover, the probable photocatalyticmechanism for degradation of CR by PANi/BiCOl photocatalyst was proposed based on the scavengerexperiments. The outcomes indicated that the PANi promoted the absorption intensity of the pure BiOClin the visible region. To that, the well-arranged array and considerably high specific surface area of PANicould encourage the transfer of electrons witch generated by the photo to 2D BiOCl substrate and repelthe recombination of electron-hole pairs.
Abdolhamid Alizadeh,Mohammad M. Khodaei,Mojtaba Beygzadeh,Davood Kordestani,Mostafa Feyzi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized Fe3O4/SiO2 magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), N2 adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized Fe3O4/SiO2 nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.
Abdolhamid Salahi,Toraj Mohammadi,Reza Mosayebi Behbahani,Mahmood Hemmati 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Hollow fiber membranes were prepared from polyethersulfone/additives/NMP&DMSO system via phase inversion induced by precipitation in non-solvent coagulation bath. The interaction effects of polyethylene-glycol (PEG), propionic-acid (PA), Tween-20, PEG molecular weight and polyvinyl-pyrrolidone (PVP) on morphology and performance of synthesized membranes were investigated. Taguchi method (L16 orthogonal array) was used initially to plan a minimum number of experiments. 32 membranes were synthesized (with two replications) and their permeation flux and TOC rejection properties to oily wastewater treatment were studied. The obtained results indicated that addition of PA to spinning dope decreases flux while it increases TOC rejection of prepared membranes. Also, the result shows that addition of PVP, Tween-20 and PEG content in spinning dope enhances permeation flux while reducing TOC rejection. The obtained results indicated that the synthesized membranes was effective and suitable for treatment of the oily wastewater to achieve up to 92.6, 98.2, and 98.5% removal of TOC, TSS, and OGC, respectively with a flux of 247.19 L/(m2h). Moreover, Hermia’s models were used for permeation flux decline prediction. Experimental data and models predictions were compared. The results showed that there is reasonable agreement between experimental data and the cake layer model followed by the intermediate blocking model.
The First Report on Chemoselective Biguanide-Catalyzed Henry Reaction under Neat Conditions
Abdolhamid Alizadeh,Mohammad M. Khodaei,Gisya Abdi,Davood Kordestani 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
An efficient synthetic method for direct Henry reaction catalyzed by a biguanide; namely metformin, as an organosuper-base, between a variety of aromatic and aliphatic aldehydes and nitromethane under neat conditions has been developed. Convenient procedure for removal of the catalyst, chemoselective acquiring of β-nitroalcohols as predominant products, as far as possible short reaction time with excellent conversions are advantages of the developed protocol.
Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Beygzadeh, Mojtaba,Kordestani, Davood,Feyzi, Mostafa Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
A novel biguanide-functionalized $Fe_3O_4/SiO_2$ magnetite nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperbase in chemical transformations. The structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM), elemental analyzer (EA), thermogravimetric analysis (TGA), $N_2$ adsorption-desorption (BET and BJH) and FT-IR. The biguanide-functionalized $Fe_3O_4/SiO_2$ nanoparticles showed a superpara-magnetic property with a saturation magnetization value of 46.7 emu/g, indicating great potential for application in magnetically separation technologies. In application point of view, the prepared catalyst was found to act as an efficient recoverable nanocatalyst in nitroaldol and domino Knoevenagel condensation/Michael addition/cyclization reactions in aqueous media under mild condition. Additionally, the catalyst was reused six times without significant degradation in catalytic activity and performance.
Ovarian Cancer in Iranian Women, a Trend Analysis of Mortality and Incidence
Sharifian, Abdolhamid,Pourhoseingholi, Mohamad Amin,Norouzinia, Mohsen,Vahedi, Mohsen Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: Ovarian cancer is an important cause of mortality in women. The aim of this study was to evaluate the incidence and mortality rates and trends in the Iranian population and make predictions. Materials and Methods: National incidence from Iranian annual of National Cancer Registration report from 2003 to 2009 and National Death Statistics reported by the Ministry of Health and Medical Education from 1999 to 2004 were included in this study. A time series model (autoregressive) was used to predict the mortality for the years 2007, 2008, 2012 and 2013, with results expressed as annual mortality rates per 100,000. Results: The general mortality rate of ovarian cancer slightly increased during the years under study from 0.01 to 0.75 and reaching plateau according to the prediction model. Mortality was higher for older age. The incidence also increased during the period of the study. Conclusions: Our study indicated remarkable increasing trends in ovarian cancer mortality and incidence. Therefore, attention to high risk groups and setting awareness programs for women are needed to reduce the associated burden in the future.
The First Report on Chemoselective Biguanide-Catalyzed Henry Reaction under Neat Conditions
Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Abdi, Gisya,Kordestani, Davood Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
An efficient synthetic method for direct Henry reaction catalyzed by a biguanide; namely metformin, as an organosuper-base, between a variety of aromatic and aliphatic aldehydes and nitromethane under neat conditions has been developed. Convenient procedure for removal of the catalyst, chemoselective acquiring of ${\beta}$-nitroalcohols as predominant products, as far as possible short reaction time with excellent conversions are advantages of the developed protocol.