Iranica Journal of Energy and Environment (IJEE)

8 - 16

Authors: Suriatie Yusuf, Muhammad Manan, Mohd Zaidi Jaafar

This paper present the study of aqueous CO foam prepared 2 by a mixtures hydrophilic silica nanoparticles and non-ionic Triton X100, TX100, surfactant. The synergistic effects of the mixture on stabilizing the CO2 foam were inferred into few key parameters namely; particles and surfactant concentration, adsorption of surfactant onto the particles via surface tension and adsorption isotherm, foam lifetime and, the size of the bubbles produced. It was found that the adsorption behaviour of TX100 on silica surface exhibit a particular characteristics depend on the concentration of silica, high total surface area available leads to high adsorptionof surfactant molecules. The synergetic performance of silica/TX100 in stabilizing foam can be observed at low (0.01%) and intermediate (0.1%) concentration of TX100. Lower concentration required low silica concentration while the intermediate concentration required high silica fraction in the dispersion to stabilize the foam.

24 - 27

Authors: Ghodsi Mohammadi Ziarani, Mehrdad Manteghian, Alireza Abbasi, Alireza Badiei, Javad Gholami

Direct oxidation of benzene to phenol in liquid phase in the medium of methanol, acetone, acetic acid and acetonitrile as a solvent over chromium catalyst supported on highly ordered nanoporous silica (Cr-LUS-1) by H2O2 were examined. The best results obtained from methanol solvent with 20% yield and selectivity of 90%. Cr-LUS-1 characterized by XRD, nitrogen adsorption-desorption isotherms and visible spectrophotometer.

36 - 42

Authors: Fatemeh Golkhou, Mahmod Tajee Hamed Mosavian

A physical vapor condensation process for synthesizing nanosized sulfur powder as a precursor for various industries was simulated by the use of computational ?uid dynamic (CFD) modeling. The phase change, swirl flow and heat transfer taking place inside the cyclone are analyzed along with particle formation via gas condensation method. The population balance model is a mathematical framework for the modeling of crystal size distribution (CSD) and the study of gas-phase changes leading to nucleation of the first solid particles. In this paper the Direct Quadrature Method of Moments is used for solving the transport equations of the moments of the size distribution. The temperature, velocity and particle size distribution ranges inside the cyclone were computed. The results show the formation of nanosulfur particles in 1-7 nm range.

49 - 52

Authors: Mousa Aliahmad, Mohsen Dehbashi

Ni-doped SnO2 nanocrystalline powders have been synthesized by the co-precipitation method from SnCl2.2H2O and NiCl2.6H2O. Nanoparticles crystallize in lower temperature (350°C) and shorter time (2hours) respect to other methods. The samples have been characterized by various advanced techniques such as, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM) and Vibrating sample magnetometer (VSM). The X-ray diffraction reveals that all samples are pure rutile-type tetragonal phase and the average particles size was observed to vary from 32 nm to 24 nm as the nickel content was increased, The TEM images confirms the size of tin oxide particles in nanoscale and VSM measurements indicate that Ni-doped samples have superparamagnetic properties and they are single-domain nanoparticles.

60 - 67

Authors: Farshad Golbabaei Kootenaei, Hasan Amini Rad

In this paper a pilot-scale membrane bioreactor (MBR) equipped with nano-membranes treating the hospital wastewaters has been studied in order to evaluate the removal of nutrients. The main goal was to examine the feasibility of the NF-MBR used to treat hospital wastewater. Process efficiency was evaluated in terms of COD, NH3 N, NO3_N, NO3_N and PO4-P removal. The pilot plant located at the Babol Clinic Hospital,_Babol, Mazandaran, Iran. The performance of NF-MBR pilot for biological nutrient removal was evaluated during 62 days of operation. The NF-MBR resulting in respective HRT of 2.9 h. The influent COD, NH3_N and PO4-P averaged at 688, 11.8 and 3 mg/l respectively. The final treated effluent COD, NH3_N and PO4-P for the same period averaged 35, 1.69 and 0.89 mg/l respectively. The operating results of the pilot plant demonstrate that the NFMBR process is both effective and efficient in meeting the water discharge and reuse quality requirements at the hospital. The NF-MBR showed a high COD removal, stable and complete nitrification. The biological nutrient removal efficiencies were high from the start of operation with COD and NH 3 N removal efficiencies of 92 ± 4% and _88 ± 2, respectively. During the course of the experiment PO4-P removal efficiencies increased and finally PO4-P removal efficiency of 68% was achieved. Indicating that the NF-MBR effluent can be directly discharged into natural waters and it’s suitable for reuse.

73 - 76

Authors: Hosein Salmani, Shamsolzaman Faramarzi

Interaction of light with nanoparticles led to extensive knowledge about electromagnetic processes which is fundamental. One of the light effects on the metal nanowires, is the changing of the light polarization . The aim of this research is to study size effects and the surrounding environment properties of nanowires on the degree of polarization of scattered light. Gold and silver metallic nanoparticles due to wide spread use of properties were selected herein. Simulated polarization of scattered light with a FORTRAN program was obtained. Parameters affecting the intensity and degree of polarization of scattered light radius, refractive index and the wavelength of incident light was made nanowire. This research was based on theory as well as simulation method. Nanowire lengths, nanowire interaction with the surrounding dielectric environment were changed polarization of the surrounding molecular nanowires. It has been concluded that silver and gold had the same polarization pattern.